WO2014007514A1 - Procédé permettant de décoder une image et appareil utilisant ce procédé - Google Patents

Procédé permettant de décoder une image et appareil utilisant ce procédé Download PDF

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WO2014007514A1
WO2014007514A1 PCT/KR2013/005857 KR2013005857W WO2014007514A1 WO 2014007514 A1 WO2014007514 A1 WO 2014007514A1 KR 2013005857 W KR2013005857 W KR 2013005857W WO 2014007514 A1 WO2014007514 A1 WO 2014007514A1
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block
unit
intra prediction
value
mode
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Korean (ko)
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김정선
박준영
김철근
전병문
헨드리헨드리
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LG Electronics Inc
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LG Electronics Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/186—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a colour or a chrominance component

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  • the present invention relates to video compression techniques, and more particularly, to an intra prediction method of a color difference block using luminance samples, and an apparatus using the method.
  • video quality of the terminal device can be supported and the network environment is diversified, in general, video of general quality may be used in one environment, but higher quality video may be used in another environment. .
  • the quality of the image for example, the image quality, the resolution of the image, the size of the image. It is necessary to provide scalability in the frame rate of video and the like. In addition, various image processing methods associated with such scalability should be discussed.
  • An object of the present invention is to provide an intra prediction method of a chrominance block and an apparatus using the same that can increase image coding and decoding efficiency.
  • One embodiment of the present invention is to provide a method for predicting a sample value of a color difference signal for each transform unit in intra prediction and an apparatus using the same.
  • Another object of the present invention is to provide a method for predicting a sample value of a color difference signal for each coding unit in intra prediction, and an apparatus using the same.
  • Another object of the present invention is to provide a method for predicting a sample value of a color difference signal for each coding tree block in intra prediction, and an apparatus using the same.
  • An image decoding method includes generating a reconstruction value for a luminance component of a current block, and predicting a color difference component of the current block based on the reconstruction value of the luminance component,
  • the predicted value of the color difference component may be derived by a reconstruction value of the luminance component and an arithmetic operation of a predetermined parameter, and the parameter may be set for each division unit of an image.
  • the parameter may be set for each coding unit.
  • the predicted value of the color difference component may be calculated as follows.
  • An image decoding apparatus includes a prediction unit that predicts a color difference component of the current block based on a reconstruction value of a luminance component of the current block, wherein the predicted value of the color difference component is a reconstruction of the luminance component. Derived by arithmetic operation of a value and a predetermined parameter, the parameter may be set for each division unit of an image.
  • an intra prediction method of a chrominance block capable of increasing image coding and decoding efficiency and an apparatus using the same are provided.
  • An embodiment of the present invention provides a method for predicting a sample value of a color difference signal for each transform unit in intra prediction, and an apparatus using the same.
  • Another embodiment of the present invention provides a method for predicting a sample value of a color difference signal for each coding unit in intra prediction, and an apparatus using the same.
  • Another embodiment of the present invention provides a method for predicting a sample value of a color difference signal for each coding tree block in intra prediction, and an apparatus using the same.
  • FIG. 4 is a diagram for describing a prediction value when a current block is predicted in a planar mode.
  • FIG. 5 is a diagram illustrating sample values of luminance components existing in and around a current block according to an exemplary embodiment of the present invention.
  • each of the components in the drawings described in the present invention are shown independently for the convenience of description of the different characteristic functions in the video encoding apparatus / decoding apparatus, each component is a separate hardware or separate software It does not mean that it is implemented.
  • two or more of each configuration may be combined to form one configuration, or one configuration may be divided into a plurality of configurations.
  • Embodiments in which each configuration is integrated and / or separated are also included in the scope of the present invention without departing from the spirit of the present invention.
  • FIG. 1 is a block diagram schematically illustrating a video encoding apparatus according to an embodiment of the present invention.
  • the video encoding / decoding method or apparatus may be implemented by an extension of a general video encoding / decoding method or apparatus that does not provide scalability, and the block diagram of FIG. 1 is based on a scalable video encoding apparatus.
  • An embodiment of a video encoding apparatus that may be represented.
  • the encoding apparatus 100 may include a picture divider 105, a predictor 110, a transformer 115, a quantizer 120, a reordering unit 125, an entropy encoding unit 130, An inverse quantization unit 135, an inverse transform unit 140, a filter unit 145, and a memory 150 are provided.
  • the predictor 110 includes an inter predictor for performing inter prediction and an intra predictor for performing intra prediction, as described below.
  • the prediction unit 110 generates a prediction block by performing prediction on the processing unit of the picture in the picture division unit 105.
  • the processing unit of the picture in the prediction unit 110 may be a CU, a TU, or a PU.
  • the prediction unit 110 may determine whether the prediction performed on the processing unit is inter prediction or intra prediction, and determine specific contents (eg, prediction mode, etc.) of each prediction method.
  • the processing unit in which the prediction is performed may differ from the processing unit in which specific contents of the prediction method and the prediction method are determined.
  • the method of prediction and the prediction mode may be determined in units of PUs, and the prediction may be performed in units of TUs.
  • the prediction block may be generated in integer sample units, or may be generated in sub-pixel units such as 1/2 pixel unit or 1/4 pixel unit.
  • the motion vector may also be expressed in units of integer pixels or less.
  • the residual may be used as the reconstructed block, and thus the residual may not be generated, transformed, quantized, or transmitted.
  • a prediction mode When performing intra prediction, a prediction mode may be determined in units of PUs, and prediction may be performed in units of PUs. In addition, a prediction mode may be determined in units of PUs, and intra prediction may be performed in units of TUs.
  • the prediction mode may have 33 directional prediction modes and at least two non-directional modes.
  • the non-directional mode may include a DC prediction mode and a planner mode (Planar mode).
  • a prediction block may be generated after applying a filter to a reference sample.
  • whether to apply the filter to the reference sample may be determined according to the intra prediction mode and / or the size of the current block.
  • the transform unit 115 performs transform on the residual block in units of transform blocks and generates transform coefficients.
  • the transform block is a rectangular block of samples to which the same transform is applied.
  • the transform block can be a transform unit (TU) and can have a quad tree structure.
  • the residual block is transformed using a discrete sine transform (DST), otherwise the residual block is transformed into a discrete cosine transform (DCT). Can be converted using.
  • DST discrete sine transform
  • DCT discrete cosine transform
  • the quantization unit 120 may generate quantized transform coefficients by quantizing the residual values transformed by the transform unit 115, that is, the transform coefficients.
  • the value calculated by the quantization unit 120 is provided to the inverse quantization unit 135 and the reordering unit 125.
  • the reordering unit 125 may rearrange the quantized transform coefficients in the form of a 2D block into a 1D vector form through a coefficient scanning method.
  • the entropy encoding unit 130 may perform entropy encoding on the quantized transform coefficients rearranged by the reordering unit 125.
  • Entropy encoding may include, for example, encoding methods such as Exponential Golomb, Context-Adaptive Variable Length Coding (CAVLC), and Context-Adaptive Binary Arithmetic Coding (CABAC).
  • the entropy encoding unit 130 may include quantized transform coefficient information, block type information, prediction mode information, partition unit information, PU information, transmission unit information, and motion vector of the CUs received from the reordering unit 125 and the prediction unit 110.
  • Various information such as information, reference picture information, interpolation information of a block, and filtering information may be encoded.
  • the inverse quantizer 135 inversely quantizes the quantized values (quantized transform coefficients) in the quantizer 120, and the inverse transformer 140 inversely transforms the inverse quantized values in the inverse quantizer 135.
  • the reconstructed block may be generated by combining the residual values generated by the inverse quantizer 135 and the inverse transform unit 140 and the prediction blocks predicted by the prediction unit 110.
  • a reconstructed block is generated by adding a residual block and a prediction block through an adder.
  • the adder may be viewed as a separate unit (restore block generation unit) for generating a reconstruction block.
  • the filter unit 145 may apply a deblocking filter, an adaptive loop filter (ALF), and a sample adaptive offset (SAO) to the reconstructed picture.
  • ALF adaptive loop filter
  • SAO sample adaptive offset
  • the deblocking filter may remove distortion generated at the boundary between blocks in the reconstructed picture.
  • the adaptive loop filter may perform filtering based on a value obtained by comparing the reconstructed image with the original image after the block is filtered through the deblocking filter. ALF may be performed only when high efficiency is applied.
  • the SAO restores the offset difference from the original image on a pixel-by-pixel basis to the residual block to which the deblocking filter is applied, and is applied in the form of a band offset and an edge offset.
  • the filter unit 145 may not apply filtering to the reconstructed block used for inter prediction.
  • FIG. 2 is a block diagram schematically illustrating a video decoding apparatus according to an embodiment of the present invention.
  • the scalable video encoding / decoding method or apparatus may be implemented by extension of a general video encoding / decoding method or apparatus that does not provide scalability, and the block diagram of FIG. 2 shows scalable video decoding.
  • FIG. 2 shows scalable video decoding.
  • the video decoding apparatus 200 includes an entropy decoding unit 210, a reordering unit 215, an inverse quantization unit 220, an inverse transform unit 225, a prediction unit 230, and a filter unit 235.
  • Memory 240 may be included.
  • VLC variable length coding
  • 'VLC' variable length coding
  • CABAC CABAC
  • the inverse quantization unit 220 may perform inverse quantization based on the quantization parameter provided by the encoding apparatus and the coefficient values of the rearranged block.
  • the inverse transform unit 225 may perform inverse DCT and / or inverse DST on the DCT and the DST performed by the transform unit of the encoding apparatus with respect to the quantization result performed by the video encoding apparatus.
  • the inverse transformation may be performed based on a transmission unit determined by the encoding apparatus or a division unit of an image.
  • the DCT and / or DST in the encoding unit of the encoding apparatus may be selectively performed according to a plurality of pieces of information, such as a prediction method, a size and a prediction direction of the current block, and the inverse transformer 225 of the decoding apparatus may be Inverse transformation may be performed based on the performed transformation information.
  • the prediction unit 230 may generate the prediction block based on the prediction block generation related information provided by the entropy decoding unit 210 and the previously decoded block and / or picture information provided by the memory 240.
  • inter prediction on the current PU may be performed based on information included in at least one of a previous picture or a subsequent picture of the current picture.
  • motion information required for inter prediction of the current PU provided by the video encoding apparatus for example, a motion vector, a reference picture index, and the like, may be derived by checking a skip flag, a merge flag, and the like received from the encoding apparatus.
  • the residual is not transmitted and the prediction block may be a reconstruction block.
  • the memory 240 may store the reconstructed picture or block to use as a reference picture or reference block and provide the reconstructed picture to the output unit.
  • the decoding apparatus 200 may further include a parsing unit (not shown) which parses information related to an encoded image included in the bitstream.
  • the parsing unit may include the entropy decoding unit 210 or may be included in the entropy decoding unit 210. Such a parser may also be implemented as one component of the decoder.
  • a block composed of a luminance component of the current block may be expressed as a luminance block and a block composed of a color difference component as a color difference component.
  • the intra prediction mode may include 33 directional prediction modes and two non-directional modes. As shown in FIG. 3, the directional mode includes the intra prediction mode 34 in the clockwise direction starting from the second intra prediction mode in the lower left direction.
  • the prediction mode 35 may represent an intra mode for the color difference component.
  • Planar mode Intra_Planar and DC mode Intra_DC which are non-directional modes, may be allocated to intra prediction modes 0 and 1, respectively.
  • DC mode a single fixed value, for example, the average value of surrounding reconstructed pixel values is used as a prediction value, and in Planer mode, vertical interpolation and horizontal use are performed using vertically adjacent pixel values of the current block and horizontally adjacent pixel values. Directional interpolation is performed, and their average value is used as the predicted value.
  • the directional mode Intra_Angular refers to modes indicating a corresponding direction at an angle between a reference pixel located in a predetermined direction and a current pixel, and may include a horizontal mode and a vertical mode.
  • a horizontal mode vertically adjacent pixel values of the current block may be used as prediction values of the current block
  • horizontally adjacent pixel values may be used as prediction values of the current block.
  • the intra prediction mode for the current block may be transmitted with a value indicating the mode itself, but may be derived from information about candidate intra prediction modes that are likely to be the intra prediction mode of the current block.
  • the reference sample may be replaced with a predetermined value, for example, a median value of sample values that the image may have.
  • the sample value of the adjacent sample which is immediately below the sample that is not available, is replaced with a reference sample value, and the available sample among the above adjacent samples is available. If a sample that has not been found is found, the sample value of the sample existing on the right side of the sample that is not available can be replaced with the reference sample value.
  • Sample values adjacent to the current block may be filtered. Whether to filter and the filtering coefficient may be set differently according to the size of the transform block and the intra prediction mode. When the step difference existing in the predicted value generated after the reference sample value and the intra prediction is applied through filtering, discontinuity that may occur at the block boundary may be reduced.
  • the prediction value for the current block may be obtained as a linear interpolation value of a plurality of reference sample values.
  • NxN N is an integer
  • N is an integer
  • the position of the upper left sample of the block is (0,0)
  • the position of the lower left sample is (0, N-1)
  • the position of the upper right sample may be expressed as (N-1, 0)
  • the position of the lower right sample may be expressed as (N-1, N-1).
  • the prediction value for the current block may be generated using the average value of the reference sample values.
  • the boundary region of the prediction block, that is, the left boundary and the right boundary of the prediction block may be filtered.
  • the prediction value may be generated using the reference sample value present in the direction of the prediction mode. Reference samples may be stretched according to the direction of the prediction mode.
  • the prediction mode is a horizontal or vertical mode
  • the prediction value of the current block located at a boundary adjacent to the reference sample may be generated through arithmetic operation of specific sample values existing at a predetermined position with the reference sample. The arithmetic operation has an effect of applying filtering to the boundary region adjacent to the reference sample, thereby reducing the discontinuity between the current block and the neighboring block.
  • a predicted value of the luminance block including the luminance component is generated, and when the residual is added to the generated predicted value, a restored value for the luminance block of the current block is derived.
  • Intra prediction for the chrominance component includes diagonal intra prediction mode (intra prediction mode No. 34), vertical intra prediction mode (intra prediction mode No. 26), horizontal intra prediction mode (intra prediction mode No. 10), and DC intra prediction mode.
  • LM Large Estimated Mode
  • DM Luma Directed Mode
  • Table 2 shows the mapping between intra prediction mode and intra prediction mode numbers when LM, vertical intra prediction mode (VER), horizontal intra prediction mode (HOR), DC intra prediction mode, and DM are used as intra prediction methods of the chrominance block. This table shows the relationship.
  • intra_chroma_pred_type 0 is Luma Estimated Mode (LM)
  • intra_chroma_pred_type 1 is vertical intra prediction mode (VER)
  • intra_chroma_pred_type 2 is horizontal intra prediction mode (HOR)
  • intra_chroma_pred_type is 3 DC intra prediction mode
  • intra_chroma_pred_type May perform intra prediction on a chrominance block in a DM (Luma Directed Mode).
  • the intra prediction mode of the chrominance block can be represented by DM
  • the intra prediction number is mapped to one of the intra prediction modes of the above five chrominance blocks. There is no need to do it.
  • intra_chroma_pred_type 1 because the intra prediction mode of the chrominance block may be represented by DM having intra_chroma_pred_type 4. There is no need to map intra prediction modes.
  • intra prediction mode of the luminance block is the vertical intra prediction mode, the horizontal intra prediction mode, or the remaining directional intra prediction mode other than the DC mode
  • the intra prediction mode of the DM mode and the luminance block is not overlapped since the DM mode and the intra prediction mode of the luminance block do not overlap.
  • intra prediction may be performed on the color difference block using five intra_chroma_pred_types.
  • the intra prediction mode used to perform intra prediction of the chrominance block and the mapping relationship between the intra prediction mode and the intra prediction mode number may be changed to arbitrary.
  • the color difference block may determine whether to use the LM in the encoding and decoding steps, and Table 2 may vary depending on whether the LM is used.
  • an oblique intra prediction mode (intra prediction mode 34) and a planar mode may be used for the intra prediction mode of the chrominance block.
  • the intra prediction mode of the luminance block is the planar mode, the vertical mode, the horizontal mode, or the DC mode
  • the intra prediction mode that can be represented by the DM among intra_chroma_pred_mode can be represented by the intra prediction mode of the chrominance block.
  • a diagonal intra mode intra prediction mode 34 may be included instead.
  • an unnecessary intra prediction mode is set to an oblique intra prediction mode (intra prediction mode 34).
  • intra prediction mode 34 oblique intra prediction mode
  • other intra prediction modes instead of intra prediction mode 34, for example, intra prediction mode 18 or intra prediction mode 2 may also be used as the intra prediction mode 34 and such embodiments are also included in the scope of the present invention. .
  • an intra prediction mode to substitute the intra prediction mode of the same chrominance block as the intra prediction mode of the luminance block is referred to as substitute_mode.
  • Intra prediction may be performed on the chrominance block.
  • LM when LM is used to predict a chrominance component, that is, a restored value of a luminance component may be used, and a predicted value of a chrominance sample may be generated using a linear equation such as Equation 2.
  • (x, y) may indicate a location in one TU.
  • the current block may be a TU.
  • Cpred means a predicted value of the sample
  • Lrecon indicates a reconstructed value of the luma sample.
  • [alpha] and [beta] are constant parameters obtained by using the restored value of the luma sample around the current block and the restored value of the chrominance sample.
  • the decoding process in the case of obtaining ⁇ and ⁇ in units of TU is as follows.
  • the variable nS is the size of the prediction block.
  • the current decoding process is applied when the intra prediction mode is 35 in FIG. 3, and the predicted value predSamples [x, y] of the color difference component is derived as follows.
  • new first variables k3 and pY ' may be calculated using linear interpolation.
  • Equation 4 the second variables L, C, LL, LC, and k2 for calculating ⁇ and ⁇ as shown in Equation 4 below may be calculated.
  • ⁇ and ⁇ may be calculated using the method of Equation 5 based on the second variable calculated through Equation 4.
  • a color difference block sample using LM may be calculated based on Equation 6 below using ⁇ and ⁇ calculated based on Equation 5 above.
  • FIG. 5 illustrates luminance sample values present in and around a current block according to an embodiment of the present invention.
  • the first sample 500 represents a subsampled luminance sample used to calculate the parameters ⁇ and ⁇ .
  • the second sample 510 represents a sample of linear interpolation of the subsampled luminance samples used to calculate the parameters ⁇ and ⁇ .
  • the parameters ⁇ and ⁇ may be set for each unit in which color difference samples are predicted, that is, for each TU, or the same ⁇ and ⁇ may be used in all TUs calculated for each CU and included in one CU.
  • Computing ⁇ and ⁇ in one CU can reduce the number of times of access to the memory storing luminance samples and chrominance samples, compared to calculating ⁇ and ⁇ for each TU. Can be reduced.
  • the decoding process for obtaining ⁇ and ⁇ in CU units is as follows.
  • the variable nS is the size of the coding block.
  • the current decoding process is applied when the intra prediction mode is 35 in FIG. 3, and the predicted value predSamples [x, y] of the color difference component is derived as follows.
  • a new first variable (k3, pY ′) may be calculated by using linear interpolation as described above.
  • Equation 8 the second variables L, C, LL, LC, and k2 for calculating ⁇ and ⁇ as shown in Equation 8 below may be calculated.
  • ⁇ and ⁇ may be calculated using the method of Equation 9 based on the second variable calculated through Equation 8.
  • Color difference block samples using LM may be calculated based on Equation 10 below using ⁇ and ⁇ calculated based on Equation 9 above.
  • ⁇ and ⁇ can be obtained using the LCU (largest coding unit) surrounding. That is, if the largest coding block is expressed differently, ⁇ and ⁇ may be calculated for each coding tree block (CTB) unit. In this case, ⁇ and ⁇ need to be calculated only once for each LCU unit, which is more effective for hardware implementation.
  • the decoding process for this is as follows.
  • the current decoding process is applied when the intra prediction mode is 35 in FIG. 3, and the predicted value predSamples [x, y] of the color difference component is derived as follows.
  • new first variables k3 and pY ' may be calculated using linear interpolation.
  • Equation 12 the second variables L, C, LL, LC, and k2 for calculating ⁇ and ⁇ as shown in Equation 12 below may be calculated.
  • ⁇ and ⁇ may be calculated using the method of Equation 13 based on the second variable calculated through Equation 12.
  • Color difference block samples using LM may be calculated based on Equation 14 below using ⁇ and ⁇ calculated based on Equation 13 above.
  • FIG. 6 is a diagram for explaining another image decoding method according to an embodiment of the present invention, specifically, a prediction method when LM is applied to a color difference component.
  • the prediction unit generates a reconstruction value for the luminance component of the current block (S610).
  • a prediction value is derived using a mode most suitable for prediction of the luminance block among intra prediction modes including a directional mode and a non-directional mode, and the prediction value is added to the residual to restore the luminance component.
  • the color difference component is predicted based on an arithmetic operation of a parameter set for each division unit of the image based on the restored value of the luminance component of the current block (S620).
  • the division unit of the image may be a coding unit, a transformation unit, or may be set for each coding tree block.
  • the parameters ⁇ and ⁇ may be calculated for each prediction unit.
  • the amount of image information to be coded and decoded decreases, thereby increasing coding and decoding efficiency of the image.

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Abstract

La présente invention a trait à un procédé permettant de décoder une image, qui comprend les étapes suivantes : génération d'une valeur reconstituée se rapportant à une composante de luminance d'un bloc en cours d'utilisation; et prédiction de la différence des couleurs du bloc en cours d'utilisation, sur la base de la valeur reconstituée de la composante de luminance, la valeur de prédiction de la différence des couleurs provenant du calcul arithmétique de la valeur reconstituée de la composante de luminance et de paramètres prédéfinis, et ces paramètres pouvant être fixés pour chaque unité de division d'image. Cela permet donc d'obtenir un procédé de prédiction intra d'un bloc de différence des couleurs qui accroît l'efficacité du codage et du décodage d'une image, ainsi qu'un appareil utilisant ce procédé.
PCT/KR2013/005857 2012-07-02 2013-07-02 Procédé permettant de décoder une image et appareil utilisant ce procédé Ceased WO2014007514A1 (fr)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10757427B2 (en) 2015-06-10 2020-08-25 Interdigital Vc Holdings, Inc. Method and device for obtaining color difference components for color picture data
WO2019059640A1 (fr) * 2017-09-19 2019-03-28 엘지전자 주식회사 Procédé de traitement d'image basé sur un mode de prédiction intra et appareil associé
CN114128272A (zh) * 2019-06-20 2022-03-01 Lg电子株式会社 基于亮度样本的映射和色度样本的缩放的视频或图像编码
US11902527B2 (en) 2019-06-20 2024-02-13 Lg Electronics Inc. Video or image coding based on mapping of luma samples and scaling of chroma samples
CN114128272B (zh) * 2019-06-20 2024-03-26 Lg电子株式会社 基于亮度样本的映射和色度样本的缩放的视频或图像编码

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