WO2017142326A1 - 비디오 부호화 방법 및 장치, 그 복호화 방법 및 장치 - Google Patents
비디오 부호화 방법 및 장치, 그 복호화 방법 및 장치 Download PDFInfo
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Definitions
- a video encoding method and apparatus and a decoding method and apparatus. More particularly, the present invention relates to a method and apparatus for efficiently performing intra prediction in video coding.
- intra prediction is a technique of predicting a current block by referring to samples that are already reconstructed around the current block.
- intra prediction blocks are generated using 35 modes in intra prediction.
- intra prediction is performed using various directions represented by 35 modes, edge information of the image remains in the residual components of the original image and the predicted image, and thus an improvement is required.
- intra prediction which is known in the existing video codec, one prediction is performed for a given mode. When prediction is performed on the predicted block again, performance may be improved.
- the present invention provides a video encoding / decoding method and apparatus capable of improving intra prediction performance and intra coding efficiency.
- generating an first prediction block by performing intra prediction on a current block using neighboring pixels of a current block, which have been previously encoded and then reconstructed, encoding before a current block And determining a reference block corresponding to the current block in the reconstructed reconstructed pixel area, generating a residual block based on the reference block, residual values of pixels included in the residual block, and included in the first prediction block.
- Generating a second prediction block by adding intra prediction values of the pixels, determining one of the first prediction block and the second prediction block as a prediction block of the current block, and a residual of the current block generated from the determined prediction block
- a video encoding method may include providing a bit stream including data. All.
- generating a first prediction block by performing intra prediction on a current block using neighboring pixels of the current block, which have been previously decoded and then reconstructed, decoding before the current block And determining a reference block corresponding to the current block in the reconstructed reconstructed pixel area, generating a residual block based on the reference block, residual values of pixels included in the residual block, and included in the first prediction block.
- Generating a second prediction block by adding intra prediction values of the pixels, determining one of the first prediction block and the second prediction block as the prediction block of the current block, and the residual data of the current block obtained from the bit stream And reconstructing the current block by using the determined prediction block.
- an intra predictor for performing an intra prediction on a current block by using neighboring pixels of a current block, previously encoded and then reconstructed, to generate a first prediction block, before a current block Determine a reference block corresponding to the current block in the reconstructed pixel area reconstructed after decoding, generate a residual block based on the reference block, and include residual values of pixels included in the residual block and the first prediction block.
- a residual prediction unit generating a second prediction block by adding intra prediction values of the pixels, and determining one of the first prediction block and the second prediction block as the prediction block of the current block, and determining the current block generated from the determined prediction block.
- a bit stream generator for generating a bit stream including residual data. It can be provided.
- the intra prediction unit for performing an intra prediction on the current block using neighboring pixels of the current block, which have been previously decoded and then reconstructed, to generate a first prediction block, before the current block Determine a reference block corresponding to the current block in the reconstructed reconstructed pixel region after decoding, generate a residual block based on the reference block, and include residual values of pixels included in the residual block and the first prediction block.
- a residual prediction unit that adds intra prediction values of the pixels to generate a second prediction block, and the residual data of the current block obtained from the bit stream by determining one of the first prediction block and the second prediction block as the prediction block of the current block
- a current block reconstruction unit for reconstructing the current block by using the determined prediction block.
- the prediction performance may be improved by compensating for the intra prediction error.
- FIG. 1A is a block diagram of a video encoding apparatus, according to an embodiment.
- FIG. 1B is a block diagram of a video decoding apparatus, according to an embodiment.
- FIG. 2 is a reference diagram for describing a process of determining a reference block using template matching, according to an exemplary embodiment.
- FIG. 3 illustrates determining a motion vector of a current block to determine a reference block, according to an embodiment.
- FIG. 4 illustrates that a search range of a reference block is set according to an embodiment.
- 5A illustrates generating a second prediction block using a residual block generated based on a reference block, according to an embodiment.
- 5B illustrates generating a second prediction block by using a residual block generated based on a reference block according to another embodiment.
- FIG. 6 is a reference diagram for describing performing filtering on a reconstructed pixel area according to an exemplary embodiment.
- 7A and 7B are reference diagrams for describing determining a reference block using a plurality of candidate blocks according to an embodiment.
- FIG. 8 is a flowchart of a video encoding method, according to an embodiment.
- FIG. 9 is a flowchart of a video decoding method, according to an embodiment.
- FIG. 10 illustrates a process of determining at least one coding unit by dividing a current coding unit according to an embodiment.
- FIG. 11 is a diagram illustrating a process of dividing a coding unit having a non-square shape and determining at least one coding unit according to an embodiment.
- FIG. 12 illustrates a process of splitting a coding unit based on at least one of block shape information and split shape information, according to an embodiment.
- FIG. 13 illustrates a method of determining a predetermined coding unit among odd number of coding units according to an embodiment.
- FIG. 14 illustrates an order in which a plurality of coding units are processed when a current coding unit is divided and a plurality of coding units are determined according to an embodiment.
- FIG. 15 illustrates a process of determining that a current coding unit is divided into odd coding units when the coding units cannot be processed in a predetermined order, according to an embodiment.
- 16 is a diagram illustrating a process of determining at least one coding unit by dividing a first coding unit according to an embodiment.
- FIG. 17 illustrates that a form in which a second coding unit may be split is limited when the second coding unit having a non-square shape determined by splitting the first coding unit satisfies a predetermined condition according to an embodiment. .
- FIG. 18 illustrates a process of splitting a coding unit having a square shape when split information cannot be divided into four square coding units according to an embodiment.
- FIG. 19 illustrates that a processing order between a plurality of coding units may vary according to a splitting process of coding units, according to an embodiment.
- 20 is a diagram illustrating a process of determining a depth of a coding unit as a shape and a size of a coding unit change when a coding unit is recursively divided and a plurality of coding units are determined according to an embodiment.
- FIG. 21 illustrates a depth index and a part index (PID) for classifying coding units, which may be determined according to shapes and sizes of coding units, according to an embodiment.
- PID part index
- FIG. 22 illustrates that a plurality of coding units are determined according to a plurality of predetermined data units included in a picture according to an embodiment.
- FIG. 23 illustrates a processing block serving as a reference for determining a determination order of reference coding units included in a picture, according to an embodiment.
- a video encoding method includes generating an first prediction block by performing intra prediction on a current block by using neighboring pixels of a current block, which are previously encoded and then reconstructed, and encoded before the current block. And determining a reference block corresponding to the current block in the reconstructed reconstructed pixel region, generating a residual block based on the reference block, residual values of pixels included in the residual block, and pixels included in the first prediction block. Generating the second prediction block by adding the intra prediction values of the two, determining one of the first prediction block and the second prediction block as the prediction block of the current block, and the residual data of the current block generated from the determined prediction block. It may include generating a bit stream comprising a.
- determining the reference block corresponding to the current block in the reconstructed pixel area may include: determining a template for the current block; Determining pixels matching the template within the reconstructed pixel area; And determining the reference block based on pixels matching the template.
- determining the reference block corresponding to the current block in the reconstructed pixel area may include determining a position of the reference block within the reconstructed pixel area; And determining a motion vector of the current block based on the position of the current block and the position of the reference block.
- the determining of the reference block corresponding to the current block in the reconstructed pixel area may include: determining a search range of the reference block in the reconstructed pixel area; The method may include determining the reference block by searching the reference block within the determined search range.
- the generating of the residual block based on the reference block may include applying the same intra prediction mode to the reference block as the current block by using neighboring pixels of the reference block. Generating a third prediction block; And generating the residual block from the difference value between the reference block and the third prediction block.
- the video encoding method may further include performing filtering on the reconstructed pixel region.
- the performing of filtering on the reconstructed pixel region may include performing the filtering on the reconstructed pixel region using any one of a Gaussian filter, a median value filter, and a bidirectional filter. have.
- the filtering of the reconstructed pixel area may include: determining a direction of the filtering based on an intra prediction mode used in the current block; And performing the filtering on the reconstructed pixel area based on the determined directionality.
- the determining of the reference block corresponding to the current block in the reconstructed pixel area may include: determining a plurality of candidate blocks in the reconstructed pixel area; And determining the reference block by using a weighted average of the plurality of candidate blocks.
- determining one of the first prediction block and the second prediction block as the prediction block of the current block may include: rate-distortion for each of the first prediction block and the second prediction block; Calculating a cost; And selecting one of the first prediction block and the second prediction block based on the calculated rate-distortion cost.
- the video encoding apparatus may include an intra prediction unit configured to generate an first prediction block by performing intra prediction on a current block by using neighboring pixels of a current block, which are previously encoded and then reconstructed, before a current block. Determine a reference block corresponding to the current block in the reconstructed reconstructed pixel region after encoding, generate a residual block based on the reference block, residual values of pixels included in the residual block, and pixels included in the first prediction block.
- the residual prediction unit generating the second prediction block by adding the intra prediction values of the two prediction blocks, and determining one of the first prediction block and the second prediction block as the prediction block of the current block, and the residual of the current block generated from the determined prediction block. It may include a bit stream generator for generating a bit stream containing data.
- the residual prediction unit generates a third prediction block of the reference block by applying the same intra prediction mode to the reference block as the current block, using the neighboring pixels of the reference block.
- the residual block may be generated from a difference value between a block and the third prediction block.
- a video decoding method may further include generating an first prediction block by performing intra prediction on a current block by using neighboring pixels of a current block, which have been previously decoded and then reconstructed. And determining a reference block corresponding to the current block in the reconstructed reconstructed pixel region, generating a residual block based on the reference block, residual values of pixels included in the residual block, and pixels included in the first prediction block. Adding the intra prediction values to generate a second prediction block, determining one of the first prediction block and the second prediction block as the prediction block of the current block, and the residual data of the current block obtained from the bit stream and And reconstructing the current block by using the determined prediction block.
- the determining of the reference block corresponding to the current block in the reconstructed pixel area may include: determining a motion vector of the current block from motion vector information obtained from the bit stream; And determining the reference block indicated by the motion vector of the current block within the reconstructed pixel area.
- the video decoding apparatus may include an intra prediction unit configured to generate a first prediction block by performing intra prediction on a current block by using neighboring pixels of a current block, which have been previously decoded and then reconstructed, before a current block. Determine a reference block corresponding to the current block in the decoded and reconstructed reconstructed pixel area, generate a residual block based on the reference block, residual values of pixels included in the residual block, and pixels included in the first prediction block.
- a residual prediction unit generating a second prediction block by adding intra prediction values of the first prediction block, and determining one of the first prediction block and the second prediction block as the prediction block of the current block, the residual data of the current block obtained from the bit stream, and It may include a current block reconstruction unit for reconstructing the current block by using the determined prediction block.
- part refers to a hardware component, such as software, FPGA or ASIC, and “part” plays certain roles. However, “part” is not meant to be limited to software or hardware.
- the “unit” may be configured to be in an addressable storage medium and may be configured to play one or more processors.
- a “part” refers to components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, procedures, Subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays and variables.
- the functionality provided within the components and “parts” may be combined into a smaller number of components and “parts” or further separated into additional components and “parts”.
- the "image” may be a static image such as a still image of a video or may represent a dynamic image such as a video, that is, the video itself.
- sample means data to be processed as data allocated to a sampling position of an image.
- pixel values and transform coefficients on a transform region may be samples in an image of a spatial domain.
- a unit including the at least one sample may be defined as a block.
- FIG. 1A is a block diagram of a video encoding apparatus, according to an embodiment.
- the video encoding apparatus 100 may include an intra predictor 110, a residual predictor 120, and a bit stream generator 130.
- the intra prediction unit 110 may generate a first prediction block by performing intra prediction on the current block by using neighboring pixels of the current block, which are previously encoded and then reconstructed.
- the current block may be any one of a coding unit, a prediction unit, and a transformation unit.
- the neighboring pixels of the current block may be a predetermined number of pixels adjacent to the current block. For example, if the size of the current block is n * n, the neighboring pixels used for intra prediction are 2n pixels adjacent to the upper side of the current block, 2n pixels adjacent to the left side of the current block, and the upper left of the current block. It can contain one pixel on the side.
- the peripheral pixels used in the intra block may have various sizes and shapes without being limited to the above.
- the intra prediction unit 110 may perform intra prediction on the current block by using one mode determined from a predetermined number of intra prediction modes.
- the intra prediction unit 110 may generate the first prediction block by performing intra prediction only when a specific condition is satisfied.
- the intra prediction unit 110 may generate the first prediction block by performing intra prediction only when the current block has a specific partition mode and a specific block size.
- the residual predictor 120 may determine a reference block corresponding to the current block in the reconstructed pixel region that is encoded after the current block and then reconstructed.
- the residual predictor 120 may determine the reference block in the reconstructed pixel region by using template matching, as described below with reference to FIG. 2.
- the residual predictor 120 may determine a block having a minimum difference from pixel values of the current block as a reference block.
- the residual predictor 120 may determine the position of the reference block within the reconstructed pixel area and determine the motion vector of the current block based on the position of the current block and the position of the reference block.
- Motion vector information may be generated based on the determined motion vector and included in the bit stream.
- the residual predictor 120 may search for the reference block in the reconstructed pixel area in the residual domain. That is, the reference block may be determined in the reconstructed pixel area by using the residual value of the pixels included in the current block and the residual value of the pixels included in the reconstructed pixel area.
- the residual predictor 120 may determine a search range of the reference block in the reconstructed pixel area, and determine a reference block by searching the reference block within the determined search range.
- the residual predictor 120 may generate a residual block based on the determined reference block.
- the residual predictor 120 may acquire a residual value of the reference block determined in the reconstructed pixel area and generate the residual block using the obtained residual value, as described below with reference to FIG. 5A. .
- the residual predictor 120 applies the same intra prediction mode to the reference block as the current block by using the neighboring pixels of the reference block as described below with reference to FIG. 5B to make the third prediction of the reference block.
- a block may be generated, and a residual block may be generated from the difference value between the reference block and the third prediction block.
- the residual predictor 120 may generate a second prediction block by adding the residual values of the pixels included in the residual block and the intra prediction values of the pixels included in the first prediction block.
- the bit stream generator 130 may determine one of the first prediction block and the second prediction block as the prediction block of the current block.
- the bit stream generator 130 calculates a rate-distortion cost for each of the first prediction block and the second prediction block, and based on the calculated rate-distortion cost, the first prediction block and the One of the second prediction blocks may be selected.
- the bit stream generator 130 may provide information indicating whether to generate a second prediction block when the second prediction block is determined as the prediction block of the current block among the first prediction block and the second prediction block. Can be included in the bit stream.
- the information indicating whether to generate the second prediction block with respect to the current block may be referred to as information indicating whether to perform residual prediction and may be signaled for each coding unit, prediction unit, or transformation unit. Can be.
- the bit stream generator 130 may generate a bit stream including residual data of the current block generated from the determined prediction block.
- the generated bit stream may be transmitted to the decoding apparatus.
- FIG. 1B is a block diagram of a video decoding apparatus, according to an embodiment.
- the video decoding apparatus 150 may include an intra predictor 160, a residual predictor 170, and a current block reconstruction unit 180.
- the intra prediction unit 160 may generate the first prediction block by performing intra prediction on the current block by using neighboring pixels of the current block, which have been previously decoded and then reconstructed.
- the intra prediction unit 160 may determine an intra prediction mode of the current block based on information indicating an intra prediction mode obtained from the bit stream, and perform intra prediction using the determined intra prediction mode. .
- the residual predictor 170 may determine whether to generate the second prediction block for the current block based on the second prediction block generation information for the current block, obtained from the bitstream.
- the determination of the reference block for generating the second prediction block and the residual block may be performed. You may not do all the creation.
- the residual prediction unit 170 determines not to generate the second prediction block for the current block based on the second prediction block generation information, the determination and residual of the reference block for generating the second prediction block are determined. Generation of blocks may be performed as described below.
- the residual predictor 170 may determine a reference block corresponding to the current block in the reconstructed pixel area decoded before the current block and then reconstructed.
- the residual predictor 170 may generate a residual block based on the reference block.
- the residual predictor 170 may generate a second prediction block by adding the residual values of the pixels included in the residual block and the intra prediction values of the pixels included in the first prediction block.
- the current block reconstruction unit 180 may determine one of the first prediction block and the second prediction block as the prediction block of the current block. According to an embodiment, one of the first prediction block and the second prediction block may be determined as the prediction block of the current block based on the second prediction block generation information for the current block, obtained from the bit stream.
- the current block reconstruction unit 180 may reconstruct the current block by using the residual data of the current block obtained from the bit stream and the determined prediction block.
- FIG. 2 is a reference diagram for describing a process of determining a reference block using template matching, according to an exemplary embodiment.
- a template 204 for the current block 200 may be determined.
- the template 204 shown in FIG. 2 has a form enclosing the left and top sides of the current block 200 by two pixels thick.
- the template 204 is not limited to the shape and size shown in FIG. 2, and may be determined by a predetermined number of pixels having various shapes and sizes.
- the template 204 can be included in the reconstructed pixel area 202.
- pixels 206 matching the template 204 within the reconstructed pixel area 202 may be determined.
- the pixels 206 matching the template 204 are shown to have the same size and shape as the template 204, but may not be limited thereto and may have various sizes and shapes.
- the pixels 206 matching the template 204 may be determined using the sample value of the template 204 and the sample value in the reconstructed pixel area 202.
- the similarity with the template 204 is calculated in various ways, and the pixels with the highest similarity can be determined.
- the search of pixels 206 that match the template 204 may be performed in the residual domain. Pixels 206 matching the template 204 may be determined using the residual value of the pixels included in the template 204 and the residual value of the pixels included in the reconstructed pixel region 202.
- the reference block 208 may be determined based on the pixels 206 matching the template 204. According to one embodiment, the reference block 208 may be determined from the pixels 206 matching the template 204 using the positional relationship between the template 204 and the current block 200.
- FIG. 3 illustrates determining a motion vector of a current block to determine a reference block, according to an embodiment.
- a reference block 302 corresponding to the current block 300 may be determined in the reconstructed pixel area.
- the location of the reference block 302 may also be determined in accordance with the determination of the reference block 302.
- the motion vector 304 of the current block may be determined based on the location of the current block 300 and the location of the reference block 302.
- a bit stream including motion vector information may be generated from the determined motion vector 304.
- the motion vector 304 may be reconstructed by obtaining motion vector information from the bit stream, and the reference block 302 indicated by the motion vector 304 may be determined based on the reconstructed motion vector 304. have.
- FIG. 4 illustrates that a search range of a reference block is set according to an embodiment.
- a search range of a reference block corresponding to the current block 400 may be determined in the reconstructed pixel area 402, and a reference block may be determined by searching for a reference block within the determined search range. .
- the size of the current block 400 may be 4 * 4.
- An upper region 404 adjacent to the current block 400 and a left region 406 adjacent to the current block 400 among the reconstructed pixel regions 402 may be a search range of the reference block.
- the range of the upper region 404 may be up to 8 pixels away from the current block 400, and the left region 406 may be up to 12 pixels away from the current block 400.
- the search range of the reference block is not limited to the above-described embodiment and may have various sizes and shapes.
- the predetermined number of pixels may be set in various ways, and the shape of the search range may also be various, such as a rectangle and a rhombus, without being limited to the upper and left pixels.
- the search range may be the entire reconstructed pixel area 402.
- interpolation may be performed on the reconstructed pixel region to generate an interpolated region including original pixels of the reconstructed pixel region and a predetermined number of subpixels positioned between the original pixels.
- the reference block may be determined by searching the region.
- 5A illustrates generating a second prediction block using a residual block generated based on a reference block, according to an embodiment.
- intra prediction of the current block 500 may be performed using neighboring pixels of the current block 500, and a first prediction block 506 may be generated.
- the reference block 502 corresponding to the current block 500 may be determined. The generation of the first prediction block 506 and the determination of the reference block 502 have been described above with reference to specific embodiments.
- the residual block 504 may be generated using the determined residual value of the reference block 502.
- the second prediction block 508 may be generated by adding the residual values of the pixels included in the residual block 504 and the intra prediction values of the pixels included in the first prediction block 506.
- 5B illustrates generating a second prediction block by using a residual block generated based on a reference block according to another embodiment.
- FIG. 5B the generation of the first prediction block 514, the determination of the reference block 512, and the generation of the second prediction block 520 using the first prediction block 514 and the residual block 518 are illustrated in FIG. Same as the embodiment described with reference to 5a. However, the process of generating the residual block 518 based on the reference block 512 is different from the embodiment of FIG. 5A.
- intra prediction may be performed on the current block 510 using the neighboring pixels of the current block 510, and a first prediction block 514 may be generated.
- the reference block 512 corresponding to the current block 510 may be determined.
- the third prediction block 516 of the reference block is generated by applying the same intra prediction mode to the reference block 512 as the current block 510.
- the residual block 518 may be generated by obtaining a difference between the sample values of the reference block 512 and the intra prediction values of the third prediction block 516.
- the second prediction block 520 may be generated by adding the residual values of the pixels included in the residual block 518 and the intra prediction values of the pixels included in the first prediction block 514.
- FIG. 6 is a reference diagram for describing performing filtering on a reconstructed pixel area according to an exemplary embodiment.
- a reconstructed pixel region 602 may be located relative to the current block 600, and filtering may be performed on the reconstructed pixel region 602.
- the filtering of the reconstructed pixel area 602 may be performed before intra prediction of the current block 600 is performed to generate the first prediction block.
- the filtering on the reconstructed pixel region 602 is performed after an intra prediction on the current block 600 is performed to generate a first prediction block and using a reference block in the reconstructed pixel region 602.
- the prediction may be performed before the second prediction block is generated.
- filtering of the reconstructed pixel region 602 may be performed using any one of a Gaussian filter, a median value filter, and a bidirectional filter.
- the directionality of the filtering may be determined based on the intra prediction mode used in the current block 600. Filtering may be performed on the reconstructed pixel region 602 based on the determined directionality. For example, when the intra prediction mode used in the current block 600 is the vertical mode, the direction of filtering may be determined in the vertical direction, and the filtering on the reconstructed pixel region 602 may be performed in the vertical direction. As another example, when the intra prediction mode used in the current block 600 is the DC mode, the directionality of the filtering may be determined to be non-directional, and the average filtering may be performed as the filtering for the reconstructed pixel region 602.
- all the filtering for the reconstructed pixel region 602 described above may be applied to the residual value of the pixels included in the reconstructed pixel region 602.
- the residual value of the pixels included in the reconstructed pixel area 602 may be multiplied by a value smaller than 1, and the multiplication may be performed by multiplying different values according to the residual values of the pixels included in the reconstructed pixel area 602. You can then clip the residuals.
- 7A and 7B are reference diagrams for describing determining a reference block using a plurality of candidate blocks according to an embodiment.
- a plurality of candidate blocks 702 may be determined in the reconstructed pixel area to determine a reference block corresponding to the current block 700.
- the template matching described with reference to FIG. 2 may be used to determine the plurality of candidate blocks 702 in the reconstructed pixel area.
- a predetermined number of candidate blocks may be determined in order of similarity with the current block or a template of the current block in the reconstructed pixel area.
- a reference block 704 may be generated using a weighted average of multiplying the determined plurality of candidate blocks 702 by the weights of w 1, w 2,. .
- FIG. 8 is a flowchart of a video encoding method, according to an embodiment.
- the intra prediction unit 110 of the video encoding apparatus 100 generates an first prediction block by performing intra prediction on the current block by using neighboring pixels of the current block, which have been previously encoded and then reconstructed. can do.
- the residual predictor 120 of the video encoding apparatus 100 may determine a reference block corresponding to the current block in the reconstructed pixel region that is encoded after the current block and then reconstructed.
- the residual predictor 120 of the video encoding apparatus 100 may generate a residual block based on the reference block.
- the residual prediction unit 120 of the video encoding apparatus 100 generates a second prediction block by adding residual values of pixels included in the residual block and intra prediction values of pixels included in the first prediction block. can do.
- the bit stream generator 130 of the video encoding apparatus 100 may determine one of the first prediction block and the second prediction block as the prediction block of the current block.
- the bit stream generator 130 of the video encoding apparatus 100 may generate a bit stream including residual data of the current block generated from the determined prediction block.
- FIG. 9 is a flowchart of a video decoding method, according to an embodiment.
- the intra prediction unit 160 of the video decoding apparatus 150 generates the first prediction block by performing intra prediction on the current block using neighboring pixels of the current block, which have been previously decoded and then reconstructed. can do.
- the residual predictor 170 of the video decoding apparatus 150 may determine a reference block corresponding to the current block in the reconstructed pixel area that is decoded before the current block and then reconstructed.
- the residual predictor 170 of the video decoding apparatus 150 may generate the residual block based on the reference block.
- the residual predictor 170 of the video decoding apparatus 150 generates a second prediction block by adding the residual values of the pixels included in the residual block and the intra prediction values of the pixels included in the first prediction block. can do.
- the current block reconstruction unit 180 of the video decoding apparatus 150 may determine one of the first prediction block and the second prediction block as the prediction block of the current block.
- the current block reconstruction unit 180 of the video decoding apparatus 150 may reconstruct the current block using the residual data of the current block obtained from the bit stream and the determined prediction block.
- FIGS. 10 to 23 An operation of the video encoding apparatus 100 may be similar to or opposite to various embodiments of the operation of the video decoding apparatus 150 described later.
- FIG. 10 illustrates a process of determining, by the video decoding apparatus 150, at least one coding unit by dividing a current coding unit according to an embodiment.
- the video decoding apparatus 150 may determine the shape of a coding unit by using block shape information, and may determine in what form the coding unit is divided using the split shape information. That is, the method of dividing the coding unit indicated by the segmentation type information may be determined according to which block form the block form information used by the video decoding apparatus 150 indicates.
- the video decoding apparatus 150 may use block shape information indicating that the current coding unit is square. For example, the video decoding apparatus 150 may determine whether to split a square coding unit, to split vertically, to split horizontally, or to split into four coding units according to the split type information. Referring to FIG. 10, when the block shape information of the current coding unit 1000 indicates a square shape, the video decoding apparatus 150 may have the same size as the current coding unit 1000 according to the split shape information indicating that the block shape information is not divided.
- the coding units 1010a having a may not be divided or split coding units 1010b, 1010c, and 1010d may be determined based on split type information indicating a predetermined division method.
- the video decoding apparatus 150 determines two coding units 1010b that split the current coding unit 1000 in the vertical direction based on split shape information indicating that the video decoding apparatus 150 is split in the vertical direction. Can be.
- the video decoding apparatus 150 may determine two coding units 1010c obtained by dividing the current coding unit 1000 in the horizontal direction, based on the split type information indicating the split in the horizontal direction.
- the video decoding apparatus 150 may determine four coding units 1010d that divide the current coding unit 1000 in the vertical direction and the horizontal direction based on the split type information indicating that the video decoding apparatus 150 is split in the vertical direction and the horizontal direction.
- the divided form in which the square coding unit may be divided should not be limited to the above-described form and may include various forms represented by the divided form information. Certain division forms in which a square coding unit is divided will be described in detail with reference to various embodiments below.
- FIG. 11 illustrates a process of determining, by the video decoding apparatus 150, at least one coding unit by dividing a coding unit having a non-square shape according to an embodiment.
- the video decoding apparatus 150 may use block shape information indicating that a current coding unit is a non-square shape.
- the video decoding apparatus 150 may determine whether to divide the current coding unit of the non-square according to the segmentation type information or whether to split the current coding unit in a predetermined method. Referring to FIG. 11, when the block shape information of the current coding unit 1100 or 1150 indicates a non-square shape, the video decoding apparatus 150 may not split the current coding unit 1100 according to the split shape information.
- coding units 1110a, 1120b, 1130a, 1130b, 1130c, 1170a which do not divide the coding units 1110 or 1160 having the same size as that of 1150, or are divided based on the split type information indicating a predetermined division method.
- 1170b, 1180a, 1180b, and 1180c may be determined.
- a predetermined division method in which a non-square coding unit is divided will be described in detail with reference to various embodiments below.
- the video decoding apparatus 150 may determine a shape in which a coding unit is divided using split shape information.
- the split shape information may include the number of at least one coding unit generated by splitting the coding unit. Can be represented.
- the video decoding apparatus 150 may determine the current coding unit 1100 or 1150 based on the split shape information. By splitting, two coding units 1120a, 11420b, or 1170a and 1170b included in the current coding unit may be determined.
- the video decoding apparatus 150 may determine the current coding unit 1100 or 1150 in the non-square form.
- the current coding unit may be split in consideration of the position of the long side. For example, the video decoding apparatus 150 divides the current coding unit 1100 or 1150 in a direction of dividing a long side of the current coding unit 1100 or 1150 in consideration of the shape of the current coding unit 1100 or 1150. To determine a plurality of coding units.
- the video decoding apparatus 150 may determine an odd number of coding units included in the current coding unit 1100 or 1150. For example, when the split form information indicates that the current coding unit 1100 or 1150 is divided into three coding units, the video decoding apparatus 150 may divide the current coding unit 1100 or 1150 into three coding units 1130a. , 1130b, 1130c, 1180a, 1180b, and 1180c. According to an embodiment, the video decoding apparatus 150 may determine an odd number of coding units included in the current coding unit 1100 or 1150, and not all sizes of the determined coding units may be the same.
- the size of a predetermined coding unit 1130b or 1180b among the determined odd coding units 1130a, 1130b, 1130c, 1180a, 1180b, and 1180c may be different from other coding units 1130a, 1130c, 1180a, and 1180c. May have That is, a coding unit that may be determined by dividing the current coding unit 1100 or 1150 may have a plurality of types, and in some cases, odd number of coding units 1130a, 1130b, 1130c, 1180a, 1180b, and 1180c. Each may have a different size.
- the video decoding apparatus 150 may determine an odd number of coding units included in the current coding unit 1100 or 1150.
- the video decoding apparatus 150 may set a predetermined limit on at least one coding unit among odd-numbered coding units generated by dividing.
- the video decoding apparatus 150 may be a coding unit positioned at the center of three coding units 1130a, 1130b, 1130c, 1180a, 1180b, and 1180c generated by splitting a current coding unit 1100 or 1150.
- the decoding process for (1130b, 1180b) may be different from other coding units 1130a, 1130c, 1180a, and 1180c.
- the video decoding apparatus 150 restricts the coding units 1130b and 1180b from being no longer divided or only a predetermined number of times. You can limit it to split.
- FIG. 12 illustrates a process of splitting a coding unit by the video decoding apparatus 150 based on at least one of block shape information and split shape information, according to an embodiment.
- the video decoding apparatus 150 may determine to split or not split the first coding unit 1200 having a square shape into coding units based on at least one of block shape information and split shape information.
- the video decoding apparatus 150 splits the first coding unit 1200 in the horizontal direction to thereby split the second coding unit. 1210 may be determined.
- the first coding unit, the second coding unit, and the third coding unit used according to an embodiment are terms used to understand a before and after relationship between the coding units. For example, when the first coding unit is split, the second coding unit may be determined. When the second coding unit is split, the third coding unit may be determined.
- the relationship between the first coding unit, the second coding unit, and the third coding unit used is based on the above-described feature.
- the video decoding apparatus 150 may determine to divide or not split the determined second coding unit 1210 into coding units based on at least one of block shape information and split shape information. Referring to FIG. 12, the video decoding apparatus 150 may determine a second coding unit 1210 having a non-square shape determined by dividing the first coding unit 1200 based on at least one of block shape information and split shape information. It may be divided into at least one third coding unit 1220a, 1220b, 1220c, 1220d, or the like, or may not split the second coding unit 1210.
- the video decoding apparatus 150 may obtain at least one of the block shape information and the split shape information, and the video decoding apparatus 150 may determine the first coding unit 1200 based on at least one of the obtained block shape information and the split shape information. ) May be divided into a plurality of second coding units (eg, 1210) of various types, and the second coding unit 1210 may be configured to perform first encoding based on at least one of block shape information and split shape information. The unit 1200 may be divided according to the divided manner.
- the second The coding unit 1210 may also be divided into third coding units (eg, 1220a, 1220b, 1220c, 1220d, etc.) based on at least one of block shape information and split shape information of the second coding unit 1210. have. That is, the coding unit may be recursively divided based on at least one of the partition shape information and the block shape information associated with each coding unit.
- a square coding unit may be determined in a non-square coding unit, and a coding unit of a square shape may be recursively divided to determine a coding unit of a non-square shape.
- a predetermined coding unit eg, located in the middle of odd-numbered third coding units 1220b, 1220c, and 1220d determined by dividing a second coding unit 1210 having a non-square shape
- Coding units or coding units having a square shape may be recursively divided.
- the third coding unit 1220c having a square shape which is one of odd third coding units 1220b, 1220c, and 1220d, may be divided in a horizontal direction and divided into a plurality of fourth coding units.
- the fourth coding unit 1240 having a non-square shape which is one of the plurality of fourth coding units, may be divided into a plurality of coding units.
- the fourth coding unit 1240 having a non-square shape may be divided into odd coding units 1250a, 1250b, and 1250c.
- the video decoding apparatus 150 splits each of the third coding units 1220a, 1220b, 1220c, 1220d, and the like into coding units based on at least one of the block shape information and the split shape information, or the second encoding. It may be determined that the unit 1210 is not divided. According to an embodiment, the video decoding apparatus 150 may divide the second coding unit 1210 having a non-square shape into an odd number of third coding units 1220b, 1220c, and 1220d. The video decoding apparatus 150 may place a predetermined limit on a predetermined third coding unit among the odd third coding units 1220b, 1220c, and 1220d.
- the video decoding apparatus 150 should be limited to the number of coding units 1220c positioned in the middle of the odd number of third coding units 1220b, 1220c, and 1220d, which are no longer divided or settable. It can be limited to.
- the video decoding apparatus 150 may include a coding unit positioned at the center of odd-numbered third coding units 1220b, 1220c, and 1220d included in a second coding unit 1210 having a non-square shape.
- the 1220c is no longer divided, or is limited to being divided into a predetermined division form (for example, only divided into four coding units or divided into a form corresponding to the divided form of the second coding unit 1210), or It can be limited to dividing only by the number of times (eg, dividing only n times, n> 0).
- the above limitation on the coding unit 1220c located in the center is merely a mere embodiment and should not be construed as being limited to the above-described embodiments, and the coding unit 1220c located in the center may be different from the coding units 1220b and 1220d. ), It should be interpreted as including various restrictions that can be decoded.
- the video decoding apparatus 150 may obtain at least one of block shape information and split shape information used to divide the current coding unit at a predetermined position in the current coding unit.
- FIG. 13 illustrates a method for the video decoding apparatus 150 to determine a predetermined coding unit among odd number of coding units, according to an exemplary embodiment.
- at least one of the block shape information and the split shape information of the current coding unit 1300 may be a sample of a predetermined position (for example, located at the center of a plurality of samples included in the current coding unit 1300). Sample 1340).
- a predetermined position in the current coding unit 1300 from which at least one of such block shape information and split shape information may be obtained should not be interpreted as being limited to the center position shown in FIG. 13, and the current coding unit 1300 is located at the predetermined position.
- the video decoding apparatus 150 may determine whether to divide or not split the current coding unit into coding units having various shapes and sizes by obtaining at least one of block shape information and split shape information obtained from a predetermined position.
- the video decoding apparatus 150 may select one coding unit from among them. Methods for selecting one of a plurality of coding units may vary, which will be described below through various embodiments.
- the video decoding apparatus 150 may divide the current coding unit into a plurality of coding units and determine a coding unit of a predetermined position.
- FIG. 13 illustrates a method for the video decoding apparatus 150 to determine a coding unit of a predetermined position from an odd number of coding units, according to an embodiment.
- the video decoding apparatus 150 may use information indicating the position of each of the odd coding units to determine a coding unit located in the middle of the odd coding units. Referring to FIG. 13, the video decoding apparatus 150 may determine an odd number of coding units 1320a, 1320b, and 1320c by dividing the current coding unit 1300. The video decoding apparatus 150 may determine the center coding unit 1320b by using information about the positions of the odd number of coding units 1320a, 1320b, and 1320c. For example, the video decoding apparatus 150 determines the positions of the coding units 1320a, 1320b, and 1320c based on information indicating the positions of predetermined samples included in the coding units 1320a, 1320b, and 1320c.
- the coding unit 1320b positioned at may be determined.
- the video decoding apparatus 150 may determine the coding units 1320a, 1320b, and 1320c based on the information indicating the positions of the samples 1330a, 1330b, and 1330c at the upper left of the coding units 1320a, 1320b, and 1320c. By determining the position, the coding unit 1320b positioned in the center may be determined.
- the information indicating the positions of the samples 1330a, 1330b, and 1330c in the upper left included in the coding units 1320a, 1320b, and 1320c, respectively may be located in the pictures of the coding units 1320a, 1320b, and 1320c. Or it may include information about the coordinates. According to an embodiment, the information indicating the positions of the samples 1330a, 1330b, and 1330c in the upper left included in the coding units 1320a, 1320b, and 1320c, respectively, may be included in the coding units 1320a and 1320b in the current coding unit 1300.
- the coding unit 1320b located in the center can be determined.
- the information indicating the position of the sample 1330a at the upper left of the upper coding unit 1320a may indicate (xa, ya) coordinates, and the sample 1330b at the upper left of the middle coding unit 1320b.
- the information indicating the position of) may indicate the (xb, yb) coordinates, and the information indicating the position of the sample 1330c on the upper left of the lower coding unit 1320c may indicate the (xc, yc) coordinates.
- the video decoding apparatus 150 may determine the center coding unit 1320b using the coordinates of the samples 1330a, 1330b, and 1330c in the upper left included in the coding units 1320a, 1320b, and 1320c, respectively.
- a coding unit 1320b including (xb, yb), which is the coordinate of the sample 1330b located in the center May be determined as a coding unit located in the middle of the coding units 1320a, 1320b, and 1320c determined by splitting the current coding unit 1300.
- the coordinates indicating the positions of the samples 1330a, 1330b, and 1330c at the upper left may indicate coordinates indicating the absolute positions in the picture, and further, the positions of the samples 1330a at the upper left of the upper coding unit 1320a.
- the (dxb, dyb) coordinate which is information indicating the relative position of the upper left sample 1330b of the middle coding unit 1320b, and the relative position of the upper left sample 1330c of the lower coding unit 1320c.
- Information (dxc, dyc) coordinates can also be used.
- the method of determining the coding unit of a predetermined position by using the coordinates of the sample as information indicating the position of the sample included in the coding unit should not be interpreted to be limited to the above-described method, and various arithmetic operations that can use the coordinates of the sample are available. It should be interpreted in a way.
- the video decoding apparatus 150 may divide the current coding unit 1300 into a plurality of coding units 1320a, 1320b, and 1320c, and may predetermined reference among the coding units 1320a, 1320b, and 1320c. According to the coding unit can be selected. For example, the video decoding apparatus 150 may select coding units 1320b having different sizes from among coding units 1320a, 1320b, and 1320c.
- the video decoding apparatus 150 includes (xa, ya) coordinates, which are information indicating the position of the sample 1330a on the upper left side of the upper coding unit 1320a, and the sample on the upper left side of the center coding unit 1320b.
- Coding unit 1320a using (xb, yb) coordinates indicating information of position of (1330b) and (xc, yc) coordinates indicating information of sample 1330c on the upper left of lower coding unit 1320c. 1320b, 1320c) may determine the width or height of each.
- the video decoding apparatus 150 uses (xa, ya), (xb, yb), and (xc, yc) coordinates indicating the positions of the coding units 1320a, 1320b, and 1320c. ) Each size can be determined.
- the video decoding apparatus 150 may determine the width of the upper coding unit 1320a as xb-xa and the height as yb-ya. According to an embodiment, the video decoding apparatus 150 may determine the width of the central coding unit 1320b as xc-xb and the height as yc-yb. According to an embodiment, the video decoding apparatus 150 may determine the width or height of the lower coding unit using the width or height of the current coding unit, and the width and height of the upper coding unit 1320a and the center coding unit 1320b. .
- the video decoding apparatus 150 may determine a coding unit having a different size from other coding units based on the widths and heights of the determined coding units 1320a, 1320b, and 1320c. Referring to FIG. 13, the video decoding apparatus 150 may determine a coding unit 1320b as a coding unit having a predetermined position while having a size different from that of the upper coding unit 1320a and the lower coding unit 1320c. However, the above-described video decoding apparatus 150 determines a coding unit having a different size from other coding units by using the size of the coding unit determined based on the sample coordinates. In this regard, various processes of determining a coding unit at a predetermined position by comparing the sizes of coding units determined according to predetermined sample coordinates may be used.
- the position of the sample to be considered for determining the position of the coding unit should not be interpreted as being limited to the upper left side described above, but may be interpreted that information on the position of any sample included in the coding unit may be used.
- the video decoding apparatus 150 may select a coding unit of a predetermined position from among odd-numbered coding units determined by splitting the current coding unit in consideration of the shape of the current coding unit. For example, if the current coding unit has a non-square shape having a width greater than the height, the video decoding apparatus 150 may determine the coding unit at a predetermined position along the horizontal direction. That is, the video decoding apparatus 150 may determine one of the coding units having different positions in the horizontal direction to limit the corresponding coding unit. If the current coding unit has a non-square shape having a height greater than the width, the video decoding apparatus 150 may determine the coding unit at a predetermined position in the vertical direction. That is, the video decoding apparatus 150 may determine one of the coding units having different positions in the vertical direction to limit the corresponding coding unit.
- the video decoding apparatus 150 may use information indicating the positions of each of the even coding units in order to determine the coding unit of the predetermined position among the even coding units.
- the video decoding apparatus 150 may determine an even number of coding units by dividing the current coding unit and determine a coding unit of a predetermined position by using information about the positions of the even coding units.
- a detailed process for this may be a process corresponding to a process of determining a coding unit of a predetermined position (for example, a middle position) among the odd number of coding units described above with reference to FIG.
- a predetermined value for a coding unit of a predetermined position in the splitting process is determined to determine a coding unit of a predetermined position among the plurality of coding units.
- Information is available.
- the video decoding apparatus 150 may determine the block shape information and the split shape stored in the sample included in the middle coding unit during the splitting process in order to determine a coding unit positioned among the coding units in which the current coding unit is divided into a plurality. At least one of the information may be used.
- the video decoding apparatus 150 may divide the current coding unit 1300 into a plurality of coding units 1320a, 1320b, and 1320c based on at least one of block shape information and split shape information.
- a coding unit 1320b positioned in the center of the plurality of coding units 1320a, 1320b, and 1320c may be determined.
- the video decoding apparatus 150 may determine a coding unit 1320b positioned in the center in consideration of a position where at least one of block shape information and split shape information is obtained.
- At least one of the block shape information and the split shape information of the current coding unit 1300 may be obtained from a sample 1340 positioned in the center of the current coding unit 1300, and the block shape information and the split shape information may be obtained.
- the coding unit 1320b including the sample 1340 is a coding unit positioned at the center. You can decide.
- the information used to determine the coding unit located in the middle should not be interpreted as being limited to at least one of the block type information and the split type information, and various types of information may be used in the process of determining the coding unit located in the center. Can be.
- predetermined information for identifying a coding unit of a predetermined position may be obtained from a predetermined sample included in the coding unit to be determined.
- the video decoding apparatus 150 may divide a plurality of coding units (eg, divided into a plurality of coding units 1320a, 1320b, and 1320c) determined by splitting a current coding unit 1300.
- Block shape information obtained from a sample at a predetermined position (for example, a sample located in the center of the current coding unit 1300) in the current coding unit 1300 to determine a coding unit located in the center of the coding units; At least one of the partition type information may be used. .
- the video decoding apparatus 150 may determine the sample at the predetermined position in consideration of the block block form of the current coding unit 1300, and the video decoding apparatus 150 may determine that the current coding unit 1300 is divided and determined.
- a coding unit 1320b including a sample from which predetermined information (for example, at least one of block shape information and split shape information) may be obtained may be determined. There may be certain restrictions. Referring to FIG.
- the video decoding apparatus 150 may determine a sample 1340 positioned in the center of the current coding unit 1300 as a sample from which predetermined information may be obtained, and the video decoding apparatus 150 may place a predetermined limit in the decoding process of the coding unit 1320b including the sample 1340.
- the position of the sample from which the predetermined information can be obtained should not be interpreted as being limited to the above-described position, but may be interpreted as samples of arbitrary positions included in the coding unit 1320b to be determined for the purpose of limitation.
- a position of a sample from which predetermined information may be obtained may be determined according to the shape of the current coding unit 1300.
- the block shape information may determine whether the shape of the current coding unit is square or non-square, and determine the position of a sample from which the predetermined information may be obtained according to the shape.
- the video decoding apparatus 150 may be positioned on a boundary that divides at least one of the width and the height of the current coding unit in half using at least one of the information about the width and the height of the current coding unit.
- the sample may be determined as a sample from which predetermined information can be obtained.
- the video decoding apparatus 150 may select one of samples adjacent to a boundary that divides the long side of the current coding unit in half. May be determined as a sample from which information may be obtained.
- the video decoding apparatus 150 when the video decoding apparatus 150 divides the current coding unit into a plurality of coding units, at least one of the block shape information and the split shape information may be used to determine a coding unit of a predetermined position among the plurality of coding units. You can use one.
- the video decoding apparatus 150 may obtain at least one of block shape information and split shape information from a sample at a predetermined position included in a coding unit, and the video decoding apparatus 150 may split the current coding unit.
- the generated plurality of coding units may be divided using at least one of split shape information and block shape information obtained from a sample of a predetermined position included in each of the plurality of coding units.
- the coding unit may be recursively split using at least one of block shape information and split shape information obtained from a sample of a predetermined position included in each coding unit. Since the recursive division process of the coding unit has been described above with reference to FIG. 12, a detailed description thereof will be omitted.
- the video decoding apparatus 150 may determine at least one coding unit by dividing the current coding unit, and determine a predetermined block (for example, the current coding unit) in order of decoding the at least one coding unit. Can be determined according to
- FIG. 14 illustrates an order in which a plurality of coding units are processed when the video decoding apparatus 150 determines a plurality of coding units by dividing a current coding unit.
- the video decoding apparatus 150 determines the second coding units 1410a and 1410b by dividing the first coding unit 1400 in the vertical direction according to the block shape information and the split shape information.
- the second coding units 1430a and 1430b may be determined by dividing the 1400 in the horizontal direction, or the second coding units 1450a, 1450b, 1450c and 1450d by dividing the first coding unit 1400 in the vertical and horizontal directions. Can be determined.
- the video decoding apparatus 150 may determine an order such that the second coding units 1410a and 1410b determined by dividing the first coding unit 1400 in the vertical direction are processed in the horizontal direction 1410c. .
- the video decoding apparatus 150 may determine the processing order of the second coding units 1430a and 1430b determined by dividing the first coding unit 1400 in the horizontal direction, in the vertical direction 1430c.
- the video decoding apparatus 150 processes the coding units for positioning the second coding units 1450a, 1450b, 1450c, and 1450d determined by dividing the first coding unit 1400 in the vertical direction and the horizontal direction, in one row.
- the coding units positioned in the next row may be determined according to a predetermined order (for example, raster scan order or z scan order 1450e).
- the video decoding apparatus 150 may recursively split coding units.
- the video decoding apparatus 150 may determine a plurality of coding units 1410a, 1410b, 1430a, 1430b, 1450a, 1450b, 1450c, and 1450d by dividing the first coding unit 1400.
- Each of the determined coding units 1410a, 1410b, 1430a, 1430b, 1450a, 1450b, 1450c, and 1450d may be recursively divided.
- the method of dividing the plurality of coding units 1410a, 1410b, 1430a, 1430b, 1450a, 1450b, 1450c, and 1450d may correspond to a method of dividing the first coding unit 1400. Accordingly, the plurality of coding units 1410a, 1410b, 1430a, 1430b, 1450a, 1450b, 1450c, and 1450d may be independently divided into a plurality of coding units. Referring to FIG. 14, the video decoding apparatus 150 may determine the second coding units 1410a and 1410b by dividing the first coding unit 1400 in the vertical direction, and further, respectively, the second coding units 1410a and 1410b. It can be decided to split independently or not.
- the video decoding apparatus 150 may divide the second coding unit 1410a on the left side into a horizontal coding direction and divide the second coding unit 1420a and 1420b, and the second coding unit 1410b on the right side. ) May not be divided.
- the processing order of coding units may be determined based on a split process of the coding units.
- the processing order of the divided coding units may be determined based on the processing order of the coding units immediately before being split.
- the video decoding apparatus 150 may independently determine the order in which the third coding units 1420a and 1420b determined by splitting the second coding unit 1410a on the left side are processed independently of the second coding unit 1410b on the right side. Since the second coding unit 1410a on the left is divided in the horizontal direction to determine the third coding units 1420a and 1420b, the third coding units 1420a and 1420b may be processed in the vertical direction 1420c.
- the third coding unit included in the second coding unit 1410a on the left side corresponds to the horizontal direction 1410c
- the right coding unit 1410b may be processed.
- FIG. 15 illustrates a process of determining that a current coding unit is divided into an odd number of coding units when the video decoding apparatus 150 may not process the coding units in a predetermined order, according to an embodiment.
- the video decoding apparatus 150 may determine that the current coding unit is split into odd coding units based on the obtained block shape information and the split shape information.
- a first coding unit 1500 having a square shape may be divided into second coding units 1510a and 1510b having a non-square shape, and each of the second coding units 1510a and 1510b may be independently formed.
- the video decoding apparatus 150 may determine a plurality of third coding units 1520a and 1520b by dividing the left coding unit 1510a in the horizontal direction among the second coding units, and may include the right coding unit 1510b. ) May be divided into an odd number of third coding units 1520c, 1520d, and 1520e.
- the video decoding apparatus 150 determines whether the third coding units 1520a, 1520b, 1520c, 1520d, and 1520e may be processed in a predetermined order to determine whether there are oddly divided coding units. You can decide. Referring to FIG. 15, the video decoding apparatus 150 may determine the third coding units 1520a, 1520b, 1520c, 1520d, and 1520e by recursively dividing the first coding unit 1500.
- the video decoding apparatus 150 may include a first coding unit 1500, a second coding unit 1510a and 1510b, or a third coding unit 1520a, 1520b, 1520c, based on at least one of block shape information and split shape information.
- the order in which the plurality of coding units included in the first coding unit 1500 are processed may be a predetermined order (for example, a z-scan order 1530), and the video decoding apparatus ( 150 may determine whether the third coding unit 1520c, 1520d, and 1520e determined by splitting the right second coding unit 1510b into an odd number satisfies a condition that may be processed according to the predetermined order.
- a predetermined order for example, a z-scan order 1530
- the video decoding apparatus ( 150 may determine whether the third coding unit 1520c, 1520d, and 1520e determined by splitting the right second coding unit 1510b into an odd number satisfies a condition that may be processed according to the predetermined order.
- the video decoding apparatus 150 satisfies a condition in which the third coding units 1520a, 1520b, 1520c, 1520d, and 1520e included in the first coding unit 1500 may be processed in a predetermined order. And whether the at least one of the width and the height of the second coding unit 1510a, 1510b is divided in half according to the boundary of the third coding unit 1520a, 1520b, 1520c, 1520d, or 1520e.
- the third coding units 1520a and 1520b which are determined by dividing the height of the left second coding unit 1510a by the non-square form in half, satisfy the condition, but the right second coding unit 1510b is 3.
- the third coding units 1520c, 1520d, and 1520e determined by dividing into two coding units may be determined to not satisfy the condition, and the video decoding apparatus 150 determines that the scan order is disconnected when the condition is not satisfied, and the right second coding unit 1510b is determined based on the determination result. It may be determined to be divided into an odd number of coding units. According to an embodiment, when the video decoding apparatus 150 is divided into an odd number of coding units, the video decoding apparatus 150 may set a predetermined restriction on a coding unit of a predetermined position among the divided coding units. Since the above has been described through the embodiments, a detailed description thereof will be omitted.
- FIG. 16 illustrates a process in which the video decoding apparatus 150 determines at least one coding unit by dividing the first coding unit 1600 according to an embodiment.
- the video decoding apparatus 150 may divide the first coding unit 1600 based on at least one of the block shape information and the split shape information acquired through the acquirer 110.
- the first coding unit 1600 having a square shape may be divided into coding units having four square shapes, or may be divided into a plurality of coding units having a non-square shape.
- the video decoding apparatus 150 may include the first coding unit.
- the video decoding apparatus 150 may form a square first coding unit 1600.
- the video decoding apparatus 150 may process the second coding units 1610a, 1610b, 1610c, 1620a, 1620b, and 1620c included in the first coding unit 1600 in a predetermined order.
- the condition is whether the at least one of the width and height of the first coding unit 1600 is divided in half according to the boundary of the second coding unit (1610a, 1610b, 1610c, 1620a, 1620b, 1620c). It is related to whether or not.
- a boundary between second coding units 1610a, 1610b, and 1610c which is determined by dividing a square first coding unit 1600 in a vertical direction, divides the width of the first coding unit 1600 in half.
- the first coding unit 1600 may be determined to not satisfy a condition that may be processed in a predetermined order.
- the boundary of the second coding units 1620a, 1620b, and 1620c which is determined by dividing the first coding unit 1600 having a square shape in the horizontal direction, does not divide the width of the first coding unit 1600 in half,
- the one coding unit 1600 may be determined as not satisfying a condition that may be processed in a predetermined order.
- the video decoding apparatus 150 may determine that such a condition is not satisfied as disconnection of the scan order, and determine that the first coding unit 1600 is divided into odd coding units based on the determination result.
- the video decoding apparatus 150 when the video decoding apparatus 150 is divided into an odd number of coding units, the video decoding apparatus 150 may set a predetermined restriction on a coding unit of a predetermined position among the divided coding units. Since the above has been described through the embodiments, a detailed description thereof will be omitted.
- the video decoding apparatus 150 may determine various coding units by dividing the first coding unit.
- the video decoding apparatus 150 may split a first coding unit 1600 having a square shape and a first coding unit 1630 or 1650 having a non-square shape into various coding units. .
- FIG. 17 illustrates that the second coding unit is split when the video coding apparatus 150 satisfies a predetermined condition when the second coding unit having a non-square shape determined by splitting the first coding unit 1700 meets a predetermined condition. It shows that the form that can be limited.
- the video decoding apparatus 150 may determine the non-square shape of the first coding unit 1700 having a square shape based on at least one of the block shape information and the partition shape information obtained through the acquirer 105. It may be determined by dividing into second coding units 1710a, 1710b, 1720a, and 1720b. The second coding units 1710a, 1710b, 1720a, and 1720b may be split independently. Accordingly, the video decoding apparatus 150 determines whether to split or not split into a plurality of coding units based on at least one of block shape information and split shape information associated with each of the second coding units 1710a, 1710b, 1720a, and 1720b. Can be.
- the video decoding apparatus 150 divides the left second coding unit 1710a of the non-square shape, which is determined by dividing the first coding unit 1700 in the vertical direction, in the horizontal direction, and then uses the third coding unit ( 1712a, 1712b) can be determined.
- the video decoding apparatus 150 divides the left second coding unit 1710a in the horizontal direction
- the right second coding unit 1710b may have the same horizontal direction as the direction in which the left second coding unit 1710a is divided. It can be limited to not be divided into.
- the right second coding unit 1710b is divided in the same direction and the third coding units 1714a and 1714b are determined, the left second coding unit 1710a and the right second coding unit 1710b are respectively horizontally aligned.
- the third coding units 1712a, 1712b, 1714a, and 1714b may be determined by being split independently. However, this means that the video decoding apparatus 150 divides the first coding unit 1700 into four square second coding units 1730a, 1730b, 1730c, and 1730d based on at least one of the block shape information and the split shape information. This is the same result as the above, which may be inefficient in terms of image decoding.
- the video decoding apparatus 150 divides the second coding unit 1720a or 1720b of the non-square shape, determined by dividing the first coding unit 11300 in the horizontal direction, into a vertical direction, and then performs a third coding unit. (1722a, 1722b, 1724a, 1724b) can be determined.
- a third coding unit (1722a, 1722b, 1724a, 1724b)
- the video decoding apparatus 150 divides one of the second coding units (for example, the upper second coding unit 1720a) in the vertical direction
- another video coding unit for example, the lower end
- the coding unit 1720b may restrict the upper second coding unit 1720a from being split in the vertical direction in the same direction as the split direction.
- FIG. 18 illustrates a process of splitting a coding unit having a square shape by the video decoding apparatus 150 when the split shape information cannot be divided into four square coding units according to an embodiment.
- the video decoding apparatus 150 divides the first coding unit 1800 based on at least one of the block shape information and the split shape information to divide the second coding units 1810a, 1810b, 1820a, 1820b, and the like. You can decide.
- the split type information may include information about various types in which a coding unit may be split, but the information on various types may not include information for splitting into four coding units having a square shape.
- the video decoding apparatus 150 may not split the square first coding unit 1800 into four square second coding units 1830a, 1830b, 1830c, and 1830d.
- the video decoding apparatus 150 may determine the second coding unit 1810a, 1810b, 1820a, 1820b, or the like having a non-square shape, based on the split shape information.
- the video decoding apparatus 150 may independently divide the non-square second coding units 1810a, 1810b, 1820a, 1820b, and the like.
- Each of the second coding units 1810a, 1810b, 1820a, 1820b, etc. may be divided in a predetermined order through a recursive method, which is based on at least one of the block shape information and the split shape information 1800. ) May be a division method corresponding to the division method.
- the video decoding apparatus 150 may determine the third coding units 1812a and 1812b having a square shape by dividing the left second coding unit 1810a in the horizontal direction, and the right second coding unit 1810b The third coding units 1814a and 1814b having a square shape may be determined by being split in the horizontal direction. Furthermore, the video decoding apparatus 150 may divide the left second coding unit 1810a and the right second coding unit 1810b in the horizontal direction to determine the third coding units 1816a, 1816b, 1816c, and 1816d having a square shape. have. In this case, the coding unit may be determined in the same form as that in which the first coding unit 1800 is divided into four second coding units 1830a, 1830b, 1830c, and 1830d.
- the video decoding apparatus 150 may determine the third coding units 1822a and 1822b having a square shape by dividing the upper second coding unit 1820a in the vertical direction, and the lower second coding unit 1820b. ) May be divided in a vertical direction to determine third coding units 1824a and 1824b having a square shape. Furthermore, the video decoding apparatus 150 may divide the upper second coding unit 1820a and the lower second coding unit 1820b in the vertical direction to determine the third coding units 1822a, 1822b, 1824a, and 1824b having a square shape. have. In this case, the coding unit may be determined in the same form as that in which the first coding unit 1800 is divided into four second coding units 1830a, 1830b, 1830c, and 1830d.
- FIG. 19 illustrates that a processing order between a plurality of coding units may vary according to a splitting process of coding units, according to an embodiment.
- the video decoding apparatus 150 may split the first coding unit 1900 based on the block shape information and the split shape information.
- the block shape information indicates a square shape and the split shape information indicates that the first coding unit 1900 is split in at least one of a horizontal direction and a vertical direction
- the video decoding apparatus 150 may determine the first coding unit 1900.
- non-square-type second coding units 1910a, 1910b, 1920a, and 1920b which are determined by dividing the first coding unit 1900 only in the horizontal direction or the vertical direction, respectively, may include block shape information and split shape information for each. It can be divided independently based on.
- the video decoding apparatus 150 divides the second coding units 1910a and 1910b generated by splitting the first coding unit 1900 in the vertical direction in the horizontal direction, respectively.
- 1916c and 1916d, and the second coding units 1920a and 1920b generated by dividing the first coding unit 1900 in the horizontal direction are divided in the horizontal direction, respectively, and the third coding units 1926a, 1926b and 1926c. 1926d). Since the splitting process of the second coding units 1910a, 1910b, 1920a, and 1920b has been described above with reference to FIG. 17, a detailed description thereof will be omitted.
- the video decoding apparatus 150 may process coding units in a predetermined order. Features of the processing of coding units according to a predetermined order have been described above with reference to FIG. 14, and thus detailed descriptions thereof will be omitted. Referring to FIG. 19, the video decoding apparatus 150 splits a first coding unit 1900 having a square shape, and thus, has four square third coding units 1916a, 1916b, 1916c, 1916d, 1926a, 1926b, 1926c, and 1926d. ) Can be determined.
- the video decoding apparatus 150 processes the processing sequence of the third coding units 1916a, 1916b, 1916c, 1916d, 1926a, 1926b, 1926c, and 1926d according to the form in which the first coding unit 1900 is divided. You can decide.
- the video decoding apparatus 150 determines the third coding units 1916a, 1916b, 1916c, and 1916d by dividing the second coding units 1910a and 1910b generated by splitting in the vertical direction in the horizontal direction.
- the video decoding apparatus 150 may first process the third coding units 1916a and 1916b included in the left second coding unit 1910a in the vertical direction, and then include the right coding unit 1910b.
- the third coding units 1916a, 1916b, 1916c, and 1916d may be processed according to an order 1917 of processing the third coding units 1916c and 1916d in the vertical direction.
- the video decoding apparatus 150 determines the third coding units 1926a, 1926b, 1926c, and 1926d by dividing the second coding units 1920a and 1920b generated by splitting in the horizontal direction in the vertical direction.
- the video decoding apparatus 150 may first process the third coding units 1926a and 1926b included in the upper second coding unit 1920a in the horizontal direction, and then include the lower coding unit 1920b.
- the third coding units 1926a, 1926b, 1926c, and 1926d may be processed according to an order 1927 of processing the third coding units 1926c and 1926d in the horizontal direction.
- second coding units 1910a, 1910b, 1920a, and 1920b may be divided, respectively, and square third coding units 1916a, 1916b, 1916c, 1916d, 1926a, 1926b, 1926c, and 1926d may be determined. have.
- the second coding units 1910a and 1910b determined by dividing in the vertical direction and the second coding units 1920a and 1920b determined by dividing in the horizontal direction are divided into different forms, but are determined after the third coding unit 1916a.
- the first coding unit 1900 is divided into coding units having the same type.
- the video decoding apparatus 150 recursively splits the coding unit through a different process based on at least one of the block shape information and the split shape information, and as a result, the video decoding apparatus 150 determines a plurality of coding units having the same shape. Coding units may be processed in different orders.
- 20 is a diagram illustrating a process of determining a depth of a coding unit as a shape and a size of a coding unit change when a coding unit is recursively divided and a plurality of coding units are determined according to an embodiment.
- the video decoding apparatus 150 may determine the depth of the coding unit according to a predetermined criterion.
- the predetermined criterion may be the length of the long side of the coding unit.
- the length of the long side of the current coding unit is divided by 2n (n> 0) times the length of the long side of the coding unit before the split, the depth of the current coding unit is greater than the depth of the coding unit before the split. It can be determined that the depth is increased by n.
- a coding unit having an increased depth is expressed as a coding unit of a lower depth.
- the video decoding apparatus 150 may have a square shape based on block shape information indicating a square shape (for example, block shape information may indicate '0: SQUARE').
- the first coding unit 2000 may be divided to determine a second coding unit 2002, a third coding unit 2004, and the like of a lower depth. If the size of the square first coding unit 2000 is 2Nx2N, the second coding unit 2002 determined by dividing the width and height of the first coding unit 2000 by 1/21 times may have a size of NxN. have. Furthermore, the third coding unit 2004 determined by dividing the width and the height of the second coding unit 2002 into half sizes may have a size of N / 2 ⁇ N / 2.
- the width and height of the third coding unit 2004 correspond to 1/22 times the first coding unit 2000.
- the depth of the first coding unit 2000 is D
- the depth of the second coding unit 2002 that is 1/21 times the width and the height of the first coding unit 2000 may be D + 1
- the depth of the third coding unit 2004 that is 1/22 times the width and the height of 2000 may be D + 2.
- block shape information indicating a non-square shape (e.g., block shape information indicates that the height is a non-square longer than the width '1: NS_VER' or the width is a non-square longer than the height).
- 2 may represent NS_HOR ', and the video decoding apparatus 150 may divide the first coding unit 2010 or 2020 having a non-square shape to form the second coding unit 2012 or 2022 of the lower depth.
- the third coding unit 2014 or 2024 may be determined.
- the video decoding apparatus 150 may determine a second coding unit (for example, 2002, 2012, 2022, etc.) by dividing at least one of a width and a height of the Nx2N size of the first coding unit 2010. That is, the video decoding apparatus 150 may determine the second coding unit 2002 having the NxN size or the second coding unit 2022 having the NxN / 2 size by dividing the first coding unit 2010 in the horizontal direction.
- the second coding unit 2012 having a size of N / 2 ⁇ N may be determined by splitting in the horizontal direction and the vertical direction.
- the video decoding apparatus 150 determines a second coding unit (eg, 2002, 2012, 2022, etc.) by dividing at least one of a width and a height of the 2N ⁇ N first coding unit 2020. It may be. That is, the video decoding apparatus 150 may determine the second coding unit 2002 having the NxN size or the second coding unit 2012 having the N / 2xN size by dividing the first coding unit 2020 in the vertical direction.
- the second coding unit 2022 having the size of NxN / 2 may be determined by splitting in the horizontal direction and the vertical direction.
- the video decoding apparatus 150 determines a third coding unit (eg, 2004, 2014, 2024, etc.) by dividing at least one of a width and a height of the NxN sized second coding unit 2002. It may be. That is, the video decoding apparatus 150 determines the third coding unit 2004 having the size of N / 2xN / 2 by dividing the second coding unit 2002 in the vertical direction and the horizontal direction, or makes the N / 22xN / 2 sized product. The third coding unit 2014 may be determined or the third coding unit 2024 having a size of N / 2 ⁇ N / 22 may be determined.
- a third coding unit eg, 2004, 2014, 2024, etc.
- the video decoding apparatus 150 splits at least one of a width and a height of the N / 2xN sized second coding unit 2012 to a third coding unit (eg, 2004, 2014, 2024, etc.). May be determined. That is, the video decoding apparatus 150 divides the second coding unit 2012 in the horizontal direction to form a third coding unit 2004 having a size of N / 2 ⁇ N / 2 or a third coding unit 2024 having a size of N / 2xN / 22. ) May be determined or divided into vertical and horizontal directions to determine a third coding unit 2014 having a size of N / 22 ⁇ N / 2.
- the video decoding apparatus 150 splits at least one of a width and a height of the NxN / 2 sized second coding unit 2014 to form a third coding unit (eg, 2004, 2014, 2024, etc.). May be determined. That is, the video decoding apparatus 150 divides the second coding unit 2012 in the vertical direction to form a third coding unit 2004 having a size of N / 2 ⁇ N / 2 or a third coding unit having a size of N / 22xN / 2 (2014). ) May be determined or divided in the vertical direction and the horizontal direction to determine the third coding unit 2024 of size N / 2 ⁇ N / 22.
- the video decoding apparatus 150 may split a square coding unit (for example, 2000, 2002, 2004) in a horizontal direction or a vertical direction.
- the first coding unit 2000 having a size of 2Nx2N is divided in the vertical direction to determine the first coding unit 2010 having the size of Nx2N, or the first coding unit 2020 having a size of 2NxN is determined by splitting in the horizontal direction.
- the depth of the coding unit determined by splitting the first coding unit 2000, 2002 or 2004 having a size of 2N ⁇ 2N into the horizontal or vertical direction is determined. May be the same as the depth of the first coding unit 2000, 2002, or 2004.
- the width and height of the third coding unit 2014 or 2024 may correspond to 1/22 times the first coding unit 2010 or 2020.
- the depth of the first coding unit 2010 or 2020 is D
- the depth of the second coding unit 2012 or 2014 that is 1/2 the width and height of the first coding unit 2010 or 2020 may be D + 1.
- the depth of the third coding unit 2014 or 2024 that is 1/22 times the width and the height of the first coding unit 2010 or 2020 may be D + 2.
- FIG. 21 illustrates a depth index and a part index (PID) for classifying coding units, which may be determined according to shapes and sizes of coding units, according to an embodiment.
- PID part index
- the video decoding apparatus 150 may determine a second coding unit having various forms by dividing the first coding unit 2100 having a square shape. Referring to FIG. 21, the video decoding apparatus 150 divides the first coding unit 2100 in at least one of a vertical direction and a horizontal direction according to the split type information to form second coding units 2102a, 2102b, 2104a, 2104b, 2106a, 2106b, 2106c, 2106d). That is, the video decoding apparatus 150 may determine the second coding units 2102a, 2102b, 2104a, 2104b, 2106a, 2106b, 2106c, and 2106d based on the split shape information about the first coding unit 2100.
- the second coding units 2102a, 2102b, 2104a, 2104b, 2106a, 2106b, 2106c, and 2106d which are determined according to split shape information about the first coding unit 2100 having a square shape, have a long side length. Depth can be determined based on this. For example, since the length of one side of the first coding unit 2100 having a square shape and the length of the long side of the second coding units 2102a, 2102b, 2104a, and 2104b having a non-square shape are the same, the first coding unit ( 2100 and the depths of the non-square second coding units 2102a, 2102b, 2104a, and 2104b may be regarded as D.
- the video decoding apparatus 150 divides the first coding unit 2100 into four square coding units 2106a, 2106b, 2106c, and 2106d based on the split form information
- the video decoding apparatus 150 divides the first coding unit into a square form. Since the length of one side of the two coding units 2106a, 2106b, 2106c, and 2106d is 1/2 times the length of one side of the first coding unit 2100, the depths of the second coding units 2106a, 2106b, 2106c, and 2106d are determined. May be a depth of D + 1 that is one depth lower than D, which is a depth of the first coding unit 2100.
- the video decoding apparatus 150 divides the first coding unit 2110 having a height greater than the width in a horizontal direction according to the split shape information, thereby performing a plurality of second coding units 2112a, 2112b, 2114a, 2114b and 2114c). According to an embodiment, the video decoding apparatus 150 divides the first coding unit 2120 having a width greater than the height in the vertical direction according to the split shape information, thereby providing a plurality of second coding units 2122a, 2122b, 2124a, 2124b, 2124c).
- the second coding units 2112a, 2112b, 2114a, 2114b, 2116a, 2116b, 2116c, and 2116d that are determined according to split shape information about the first coding unit 2110 or 2120 having a non-square shape may be used. Depth may be determined based on the length of the long side. For example, since the length of one side of the second coding units 2112a and 2112b having a square shape is 1/2 times the length of one side of the first coding unit 2110 having a non-square shape having a height greater than the width, the square is square.
- the depths of the second coding units 2102a, 2102b, 2104a, and 2104b of the form are D + 1, which is one depth lower than the depth D of the first coding unit 2110 of the non-square form.
- the video decoding apparatus 150 may divide the non-square first coding unit 2110 into odd second coding units 2114a, 2114b, and 2114c based on the split shape information.
- the odd numbered second coding units 2114a, 2114b, and 2114c may include non-square second coding units 2114a and 2114c and square shape second coding units 2114b.
- the length of the long side of the second coding units 2114a and 2114c of the non-square shape and the length of one side of the second coding unit 2114b of the square shape is 1 / time of the length of one side of the first coding unit 2110.
- the depths of the second coding units 2114a, 2114b, and 2114c may be a depth of D + 1 that is one depth lower than the depth D of the first coding unit 2110.
- the video decoding apparatus 150 corresponds to the above-described method of determining depths of coding units associated with the first coding unit 2110, and is related to the first coding unit 2120 having a non-square shape having a width greater than the height. Depth of coding units may be determined.
- the video decoding apparatus 150 may determine the size ratio between the coding units.
- the index can be determined based on this.
- a coding unit 2114b positioned at the center of odd-numbered split coding units 2114a, 2114b, and 2114c may have the same width as the other coding units 2114a and 2114c but have different heights. It may be twice the height of the fields 2114a and 2114c. That is, in this case, the coding unit 2114b positioned in the center may include two of the other coding units 2114a and 2114c.
- the video decoding apparatus 150 may determine whether odd-numbered split coding units are not the same size based on whether there is a discontinuity of an index for distinguishing the split coding units.
- the video decoding apparatus 150 may determine whether the video decoding apparatus 150 is divided into a specific division type based on a value of an index for dividing the plurality of coding units determined by dividing from the current coding unit. Referring to FIG. 21, the video decoding apparatus 150 determines an even number of coding units 2112a and 2112b by dividing a first coding unit 2110 having a height greater than a width, or an odd number of coding units 2114a and 2114b. , 2114c). The video decoding apparatus 150 may use an index (PID) indicating each coding unit to distinguish each of the plurality of coding units. According to an embodiment, the PID may be obtained from a sample (eg, an upper left sample) at a predetermined position of each coding unit.
- a sample eg, an upper left sample
- the video decoding apparatus 150 may determine a coding unit of a predetermined position among coding units determined by splitting by using an index for dividing coding units. According to an embodiment of the present disclosure, when the splitting shape information of the first coding unit 2110 having a height greater than the width is divided into three coding units, the video decoding apparatus 150 may determine the first coding unit 2110. It may be divided into three coding units 2114a, 2114b, and 2114c. The video decoding apparatus 150 may allocate an index for each of three coding units 2114a, 2114b, and 2114c. The video decoding apparatus 150 may compare the indices of the respective coding units to determine the coding unit among the oddly divided coding units.
- the video decoding apparatus 150 encodes a coding unit 2114b having an index corresponding to a center value among the indices based on the indexes of the coding units, and encodes the center position among the coding units determined by splitting the first coding unit 2110. It can be determined as a unit. According to an embodiment, the video decoding apparatus 150 may determine the indexes based on the size ratio between the coding units when the coding units are not the same size in determining the indexes for the division of the divided coding units. . Referring to FIG. 21, a coding unit 2114b generated by dividing a first coding unit 2110 may include coding units 2114a and 2114c having the same width but different heights as other coding units 2114a and 2114c.
- the video decoding apparatus 150 may determine that the video decoding apparatus 150 is divided into a plurality of coding units including a coding unit having a different size from other coding units. In this case, when the split form information is divided into odd coding units, the video decoding apparatus 150 may have a shape that is different in size from coding units having different coding units (for example, middle coding units) at a predetermined position among the odd coding units.
- the current coding unit can be divided by.
- the video decoding apparatus 150 may determine a coding unit having a different size by using an index (PID) for the coding unit.
- PID index
- the above-described index, the size or position of the coding unit of the predetermined position to be determined are specific to explain an embodiment and should not be construed as being limited thereto. Various indexes and positions and sizes of the coding unit may be used. Should be interpreted.
- the video decoding apparatus 150 may use a predetermined data unit at which recursive division of coding units begins.
- FIG. 22 illustrates that a plurality of coding units are determined according to a plurality of predetermined data units included in a picture according to an embodiment.
- the predetermined data unit may be defined as a data unit in which a coding unit starts to be recursively divided using at least one of block shape information and split shape information. That is, it may correspond to the coding unit of the highest depth used in the process of determining a plurality of coding units for dividing the current picture.
- a predetermined data unit will be referred to as a reference data unit.
- the reference data unit may represent a predetermined size and shape.
- the reference coding unit may include samples of M ⁇ N. M and N may be the same as each other, and may be an integer represented by a multiplier of two. That is, the reference data unit may represent a square or non-square shape, and then may be divided into integer coding units.
- the video decoding apparatus 150 may divide the current picture into a plurality of reference data units. According to an embodiment, the video decoding apparatus 150 may divide a plurality of reference data units for dividing a current picture using split information for each reference data unit. The division process of the reference data unit may correspond to the division process using a quad-tree structure.
- the video decoding apparatus 150 may determine in advance a minimum size that the reference data unit included in the current picture may have. Accordingly, the video decoding apparatus 150 may determine reference data units having various sizes having a minimum size or more, and determine at least one coding unit using block shape information and split shape information based on the determined reference data units. You can decide.
- the video decoding apparatus 150 may use a reference coding unit 2200 having a square shape, or may use a reference coding unit 2202 of a non-square shape.
- the shape and size of the reference coding unit may include various data units (eg, a sequence, a picture, a slice, and a slice segment) that may include at least one reference coding unit. slice segment, maximum coding unit, etc.).
- the acquirer 105 of the video decoding apparatus 150 may obtain at least one of information about a shape of a reference coding unit and information about a size of a reference coding unit from each bit data in the bitstream. have.
- a process of determining at least one coding unit included in the reference coding unit 2200 having a square shape has been described above by splitting the current coding unit 300 of FIG. 10, and refers to the reference coding unit 2200 having a non-square shape. Since the process of determining at least one coding unit included in the above is described above through the process of splitting the current coding unit 1100 or 1150 of FIG. 11, a detailed description thereof will be omitted.
- the video decoding apparatus 150 may determine the size and shape of the reference coding unit in order to determine the size and shape of the reference coding unit according to some data unit predetermined based on a predetermined condition.
- the acquirer 105 may determine, from the bitstream, a data unit having a predetermined size (for example, a slice or less) among a variety of data units (for example, a sequence, a picture, a slice, a slice segment, a maximum coding unit, etc.). ), The index for identifying the size and shape of the reference coding unit may be obtained for each slice, slice segment, maximum coding unit, etc. as a data unit that satisfies.
- the video decoding apparatus 150 may determine the size and shape of the reference data unit for each data unit satisfying the predetermined condition by using the index.
- the index may be obtained and used. In this case, at least one of the size and shape of the reference coding unit corresponding to the index indicating the size and shape of the reference coding unit may be predetermined.
- the video decoding apparatus 150 selects at least one of the predetermined size and shape of the reference coding unit according to the index, thereby selecting at least one of the size and shape of the reference coding unit included in the data unit that is the index acquisition index. You can decide.
- the video decoding apparatus 150 may use at least one reference coding unit included in one maximum coding unit. That is, at least one reference coding unit may be included in the maximum coding unit for dividing an image, and the coding unit may be determined through a recursive division process of each reference coding unit. According to an embodiment, at least one of the width and the height of the maximum coding unit may correspond to an integer multiple of at least one of the width and the height of the reference coding unit. According to an embodiment, the size of the reference coding unit may be a size obtained by dividing the maximum coding unit n times according to a quad tree structure.
- the video decoding apparatus 150 may determine the reference coding unit by dividing the maximum coding unit n times according to the quad tree structure, and according to various embodiments, at least one of the block shape information and the split shape information according to various embodiments. Can be divided based on.
- FIG. 23 is a diagram of a processing block serving as a reference for determining a determination order of a reference coding unit included in a picture 2300, according to an exemplary embodiment.
- the video decoding apparatus 150 may determine at least one processing block for dividing a picture.
- the processing block is a data unit including at least one reference coding unit for dividing an image, and the at least one reference coding unit included in the processing block may be determined in a specific order. That is, the determination order of at least one reference coding unit determined in each processing block may correspond to one of various types of order in which the reference coding unit may be determined, and the reference coding unit determination order determined in each processing block. May be different per processing block.
- the order of determination of the reference coding units determined for each processing block is raster scan, Z-scan, N-scan, up-right diagonal scan, and horizontal scan. It may be one of various orders such as a horizontal scan, a vertical scan, etc., but the order that may be determined should not be construed as being limited to the scan orders.
- the video decoding apparatus 150 may determine the size of at least one processing block included in the image by obtaining information about the size of the processing block.
- the video decoding apparatus 150 may determine the size of at least one processing block included in the image by obtaining information about the size of the processing block from the bitstream.
- the size of such a processing block may be a predetermined size of a data unit indicated by the information about the size of the processing block.
- the acquirer 105 of the video decoding apparatus 150 may obtain information about a size of a processing block from a bitstream for each specific data unit.
- the information about the size of the processing block may be obtained from the bitstream in data units such as an image, a sequence, a picture, a slice, and a slice segment. That is, the acquirer 105 may obtain information about the size of the processing block from the bitstream for each of the various data units, and the video decoding apparatus 150 may divide the picture by using the information about the size of the acquired processing block.
- the size of at least one processing block may be determined, and the size of the processing block may be an integer multiple of the reference coding unit.
- the video decoding apparatus 150 may determine the sizes of the processing blocks 2302 and 2312 included in the picture 2300. For example, the video decoding apparatus 150 may determine the size of the processing block based on the information about the size of the processing block obtained from the bitstream. Referring to FIG. 23, the video decoding apparatus 150 may increase the horizontal sizes of the processing blocks 2302 and 2312 by four times the horizontal size of the reference coding unit and the four times the vertical size of the reference coding unit, according to an exemplary embodiment. You can decide. The video decoding apparatus 150 may determine an order in which at least one reference coding unit is determined in at least one processing block.
- the video decoding apparatus 150 may determine each processing block 2302 and 2312 included in the picture 2300 based on the size of the processing block, and include the processing block 2302 and 2312 in the processing block 2302 and 2312.
- a determination order of at least one reference coding unit may be determined.
- the determination of the reference coding unit may include the determination of the size of the reference coding unit.
- the video decoding apparatus 150 may obtain information about a determination order of at least one reference coding unit included in at least one processing block from a bitstream, and based on the obtained determination order The order in which at least one reference coding unit is determined may be determined.
- the information about the determination order may be defined in an order or direction in which reference coding units are determined in the processing block. That is, the order in which the reference coding units are determined may be independently determined for each processing block.
- the video decoding apparatus 150 may obtain information about a determination order of a reference coding unit from a bitstream for each specific data unit.
- the acquirer 105 may obtain information on the determination order of the reference coding unit from the bitstream for each data unit such as an image, a sequence, a picture, a slice, a slice segment, and a processing block. Since the information about the determination order of the reference coding unit indicates the determination order of the reference coding unit in the processing block, the information about the determination order may be obtained for each specific data unit including an integer number of processing blocks.
- the video decoding apparatus 150 may determine at least one reference coding unit based on the order determined according to an embodiment.
- the acquirer 105 may obtain information about a reference coding unit determination order from the bitstream as information related to the processing blocks 2302 and 2312, and the video decoding apparatus 150 may process the processing block.
- An order of determining at least one reference coding unit included in 2230 and 2312 may be determined, and at least one reference coding unit included in the picture 2300 may be determined according to the determination order of the coding unit.
- the video decoding apparatus 150 may determine the determination orders 2304 and 2314 of at least one reference coding unit associated with each processing block 2302 and 2312. For example, when information about the determination order of the reference coding unit is obtained for each processing block, the reference coding unit determination order associated with each processing block 2302 and 2312 may be different for each processing block.
- the reference coding unit included in the processing block 2302 may be determined according to the raster scan order.
- the reference coding unit determination order 2314 associated with the other processing block 2312 is the reverse order of the raster scan order
- the reference coding units included in the processing block 2312 may be determined according to the reverse order of the raster scan order.
- the video decoding apparatus 150 may decode at least one determined reference coding unit according to an embodiment.
- the video decoding apparatus 150 may decode an image based on the reference coding unit determined through the above-described embodiment.
- the method of decoding the reference coding unit may include various methods of decoding an image.
- the video decoding apparatus 150 may obtain and use block shape information indicating a shape of a current coding unit or split shape information indicating a method of dividing a current coding unit from a bitstream.
- Block type information or split type information may be included in a bitstream associated with various data units.
- the video decoding apparatus 150 may include a sequence parameter set, a picture parameter set, a video parameter set, a slice header, and a slice segment header. block type information or segmentation type information included in a segment header) may be used.
- the video decoding apparatus 150 may obtain and use syntax corresponding to block shape information or split shape information from the bitstream from the bitstream for each maximum coding unit, reference coding unit, and processing block.
- the above-described embodiments of the present disclosure may be written as a program executable on a computer, and may be implemented in a general-purpose digital computer operating the program using a computer-readable recording medium.
- the computer-readable recording medium may include a storage medium such as a magnetic storage medium (eg, a ROM, a floppy disk, a hard disk, etc.) and an optical reading medium (eg, a CD-ROM, a DVD, etc.).
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Abstract
Description
Claims (15)
- 비디오 부호화 방법에 있어서,이전에 부호화된 후 복원된, 현재 블록의 주변 픽셀들을 이용하여 상기 현재 블록에 대한 인트라 예측을 수행하여 제1 예측 블록을 생성하는 단계;상기 현재 블록 이전에 부호화된 후 복원된 복원 픽셀 영역 내에서 상기 현재 블록에 대응하는 참조 블록을 결정하는 단계;상기 참조 블록에 기초하여 잔차 블록을 생성하는 단계;상기 잔차 블록에 포함된 픽셀들의 잔차 값들과 상기 제1 예측 블록에 포함된 픽셀들의 인트라 예측 값들을 가산하여 제2 예측 블록을 생성하는 단계;상기 제1 예측 블록 및 상기 제2 예측 블록 중 하나를 상기 현재 블록의 예측 블록으로 결정하는 단계; 및상기 결정된 예측 블록으로부터 생성된 상기 현재 블록의 잔차 데이터를 포함하는 비트 스트림을 생성하는 단계를 포함하는 것을 특징으로 하는 비디오 부호화 방법.
- 제1항에 있어서,상기 복원 픽셀 영역 내에서 상기 현재 블록에 대응하는 상기 참조 블록을 결정하는 단계는,상기 현재 블록에 대한 템플릿을 결정하는 단계;상기 복원 픽셀 영역 내에서 상기 템플릿에 매칭하는 픽셀들을 결정하는 단계; 및상기 템플릿에 매칭하는 픽셀들에 기초하여 상기 참조 블록을 결정하는 단계를 포함하는 것을 특징으로 하는 비디오 부호화 방법.
- 제1항에 있어서,상기 복원 픽셀 영역 내에서 상기 현재 블록에 대응하는 상기 참조 블록을 결정하는 단계는,상기 복원 픽셀 영역 내에서 상기 참조 블록의 위치를 결정하는 단계; 및상기 현재 블록의 위치 및 상기 참조 블록의 위치에 기초하여 상기 현재 블록의 움직임 벡터를 결정하는 단계를 포함하는 것을 특징으로 하는 비디오 부호화 방법.
- 제1항에 있어서,상기 복원 픽셀 영역 내에서 상기 현재 블록에 대응하는 상기 참조 블록을 결정하는 단계는,상기 복원 픽셀 영역 내에서 상기 참조 블록의 검색 범위를 결정하는 단계;상기 결정된 검색 범위 내에서 상기 참조 블록을 검색하여 상기 참조 블록을 결정하는 단계를 포함하는 것을 특징으로 하는 비디오 부호화 방법.
- 제1항에 있어서,상기 참조 블록에 기초하여 상기 잔차 블록을 생성하는 단계는,상기 참조 블록의 주변 픽셀들을 이용하여, 상기 참조 블록에 상기 현재 블록과 동일한 인트라 예측 모드를 적용하여 상기 참조 블록의 제3 예측 블록을 생성하는 단계; 및상기 참조 블록과 상기 제3 예측 블록 사이의 차분 값으로부터 상기 잔차 블록을 생성하는 단계를 포함하는 것을 특징으로 하는 비디오 부호화 방법.
- 제1항에 있어서,상기 복원 픽셀 영역에 대한 필터링을 수행하는 단계를 더 포함하는 것을 특징으로 하는 비디오 부호화 방법.
- 제6항에 있어서,상기 복원 픽셀 영역에 대한 필터링을 수행하는 단계는,가우시안 필터, 중간 값 필터, 양방향 필터 중 어느 하나를 이용하여 상기 복원 픽셀 영역에 대한 상기 필터링을 수행하는 단계를 포함하는 것을 특징으로 하는 비디오 부호화 방법.
- 제6항에 있어서,상기 복원 픽셀 영역에 대한 필터링을 수행하는 단계는,상기 현재 블록에서 이용되는 인트라 예측 모드에 기초하여 상기 필터링의 방향성을 결정하는 단계; 및상기 결정된 방향성에 기초하여 상기 복원 픽셀 영역에 대한 상기 필터링을 수행하는 단계를 포함하는 것을 특징으로 하는 비디오 부호화 방법.
- 제1항에 있어서,상기 복원 픽셀 영역 내에서 상기 현재 블록에 대응하는 상기 참조 블록을 결정하는 단계는,상기 복원 픽셀 영역 내에서 복수의 후보 블록들을 결정하는 단계; 및상기 복수의 후보 블록들의 가중 평균을 이용하여 상기 참조 블록을 결정하는 단계를 포함하는 것을 특징으로 하는 비디오 부호화 방법.
- 제1항에 있어서,상기 제1 예측 블록 및 상기 제2 예측 블록 중 하나를 상기 현재 블록의 상기 예측 블록으로 결정하는 단계는,상기 제1 예측 블록 및 상기 제2 예측 블록 각각에 대한 율-왜곡 코스트를 계산하는 단계; 및상기 계산된 율-왜곡 코스트에 기초하여 상기 제1 예측 블록 및 상기 제2 예측 블록 중 하나를 선택하는 단계를 포함하는 것을 특징으로 하는 비디오 부호화 방법.
- 비디오 부호화 장치에 있어서,이전에 부호화된 후 복원된, 현재 블록의 주변 픽셀들을 이용하여 상기 현재 블록에 대한 인트라 예측을 수행하여 제1 예측 블록을 생성하는 인트라 예측부;상기 현재 블록 이전에 부호화된 후 복원된 복원 픽셀 영역 내에서 상기 현재 블록에 대응하는 참조 블록을 결정하고, 상기 참조 블록에 기초하여 잔차 블록을 생성하고, 상기 잔차 블록에 포함된 픽셀들의 잔차 값들과 상기 제1 예측 블록에 포함된 픽셀들의 인트라 예측 값들을 가산하여 제2 예측 블록을 생성하는 잔차 예측부; 및상기 제1 예측 블록 및 상기 제2 예측 블록 중 하나를 상기 현재 블록의 예측 블록으로 결정하고, 상기 결정된 예측 블록으로부터 생성된 상기 현재 블록의 잔차 데이터를 포함하는 비트 스트림을 생성하는 비트 스트림 생성부를 포함하는 것을 특징으로 하는 비디오 부호화 장치.
- 제11항에 있어서,상기 잔차 예측부는,상기 참조 블록의 주변 픽셀들을 이용하여, 상기 참조 블록에 상기 현재 블록과 동일한 인트라 예측 모드를 적용하여 상기 참조 블록의 제3 예측 블록을 생성하고, 상기 참조 블록과 상기 제3 예측 블록 사이의 차분 값으로부터 상기 잔차 블록을 생성하는 것을 특징으로 하는 비디오 부호화 장치.
- 비디오 복호화 방법에 있어서,이전에 복호화된 후 복원된, 현재 블록의 주변 픽셀들을 이용하여 상기 현재 블록에 대한 인트라 예측을 수행하여 제1 예측 블록을 생성하는 단계;상기 현재 블록 이전에 복호화된 후 복원된 복원 픽셀 영역 내에서 상기 현재 블록에 대응하는 참조 블록을 결정하는 단계;상기 참조 블록에 기초하여 잔차 블록을 생성하는 단계;상기 잔차 블록에 포함된 픽셀들의 잔차 값들과 상기 제1 예측 블록에 포함된 픽셀들의 인트라 예측 값들을 가산하여 제2 예측 블록을 생성하는 단계;상기 제1 예측 블록 및 상기 제2 예측 블록 중 하나를 상기 현재 블록의 예측 블록으로 결정하는 단계; 및비트 스트림으로부터 획득된 상기 현재 블록의 잔차 데이터 및 상기 결정된 예측 블록을 이용하여 상기 현재 블록을 복원하는 단계를 포함하는 것을 특징으로 하는 비디오 복호화 방법.
- 제13항에 있어서,상기 참조 블록에 기초하여 상기 잔차 블록을 생성하는 단계는,상기 참조 블록의 주변 픽셀들을 이용하여, 상기 참조 블록에 상기 현재 블록과 동일한 인트라 예측 모드를 적용하여 상기 참조 블록의 제3 예측 블록을 생성하는 단계; 및상기 참조 블록과 상기 제3 예측 블록 사이의 차분 값으로부터 상기 잔차 블록을 생성하는 단계를 포함하는 것을 특징으로 하는 비디오 복호화 방법.
- 제13항에 있어서,상기 복원 픽셀 영역 내에서 상기 현재 블록에 대응하는 상기 참조 블록을 결정하는 단계는,상기 비트 스트림으로 획득된 움직임 벡터 정보로부터 상기 현재 블록의 움직임 벡터를 결정하는 단계; 및상기 복원 픽셀 영역 내에서 상기 현재 블록의 상기 움직임 벡터가 가리키는 상기 참조 블록을 결정하는 단계를 포함하는 것을 특징으로 하는 비디오 복호화 방법.
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| Application Number | Priority Date | Filing Date | Title |
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| EP17753487.2A EP3396960A4 (en) | 2016-02-16 | 2017-02-16 | METHOD AND DEVICE FOR VIDEO CODING AND METHOD AND DEVICE FOR VIDEO DECODING |
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| WO2020047517A1 (en) * | 2018-08-31 | 2020-03-05 | Hulu, LLC | Selective template matching in video coding |
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| WO2019165343A1 (en) * | 2018-02-26 | 2019-08-29 | Interdigital Vc Holdings, Inc. | Gradient based boundary filtering in intra prediction |
| JP7284375B2 (ja) * | 2019-01-15 | 2023-05-31 | 富士通株式会社 | 動画像符号化プログラム、及び動画像符号化装置 |
| EP3957075A4 (en) * | 2019-06-17 | 2022-11-02 | Zhejiang Dahua Technology Co., Ltd. | CODING BLOCK PREDICTION SYSTEMS AND METHODS |
| US12120296B2 (en) * | 2021-03-23 | 2024-10-15 | Tencent America LLC | Method and apparatus for video coding |
| CN116546211A (zh) * | 2022-01-26 | 2023-08-04 | 腾讯科技(深圳)有限公司 | 视频编码方法、装置、计算机设备及存储介质 |
| WO2024109650A1 (en) * | 2022-11-21 | 2024-05-30 | Zhejiang Dahua Technology Co., Ltd. | Systems and methods for image processing |
| WO2024144118A1 (ko) * | 2022-12-26 | 2024-07-04 | 현대자동차주식회사 | 영상 부호화/복호화 방법, 장치 및 비트스트림을 저장한 기록 매체 |
| WO2024147667A2 (ko) * | 2023-01-04 | 2024-07-11 | 한국전자통신연구원 | 영상 부호화/복호화를 위한 방법, 장치 및 기록 매체 |
| WO2024248371A1 (ko) * | 2023-05-26 | 2024-12-05 | 삼성전자 주식회사 | 영상 코딩 방법 및 이를 위한 장치 |
| CN121286011A (zh) * | 2023-06-01 | 2026-01-06 | 三星电子株式会社 | 使用帧内预测模式的图像编码方法、编码设备、解码方法和解码设备 |
| CN121399934A (zh) * | 2023-07-05 | 2026-01-23 | 三星电子株式会社 | 图像解码方法、图像解码装置、图像编码方法和图像编码装置 |
| WO2025105701A1 (ko) * | 2023-11-15 | 2025-05-22 | 삼성전자 주식회사 | 템플릿 매칭을 이용하여 영상을 부호화 및 복호화하는 장치, 및 방법 |
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| US12149729B2 (en) | 2018-08-31 | 2024-11-19 | Hulu, LLC | Selective template matching in video coding |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3396960A4 (en) | 2019-04-10 |
| KR20180107082A (ko) | 2018-10-01 |
| EP3396960A1 (en) | 2018-10-31 |
| KR102856248B1 (ko) | 2025-09-04 |
| US20190037217A1 (en) | 2019-01-31 |
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