WO2016192055A1 - Procédé et appareil de codage d'image à l'aide d'informations de prédiction et dispositif de traitement d'image - Google Patents

Procédé et appareil de codage d'image à l'aide d'informations de prédiction et dispositif de traitement d'image Download PDF

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Publication number
WO2016192055A1
WO2016192055A1 PCT/CN2015/080638 CN2015080638W WO2016192055A1 WO 2016192055 A1 WO2016192055 A1 WO 2016192055A1 CN 2015080638 W CN2015080638 W CN 2015080638W WO 2016192055 A1 WO2016192055 A1 WO 2016192055A1
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Prior art keywords
prediction information
image
encoded
information
pixel
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English (en)
Chinese (zh)
Inventor
叶姜莉
付轩
王争
朱建清
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Fujitsu Ltd
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Fujitsu Ltd
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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
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/105—Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction

Definitions

  • the present invention relates to the field of graphic image technology, and in particular, to an image encoding method and apparatus using prediction information, and an image processing apparatus.
  • Palette-based coding is widely used in graphic image technology (especially video coding technology).
  • a coding unit for the image area to be encoded, for example, a coding unit (CU), including a plurality of pixels having color values (for example, RGB mode, having 24 bits of true color); in order to reduce the storage bits
  • the storage capacity of the image image which can usually point the pixel to the data index of the palette.
  • the color value of each output pixel can be determined by looking up a palette with a corresponding data index.
  • the palette is a set of pixel values. For pixels whose pixel values are in the palette, only the pixel index corresponding to the pixel value in the palette is used. Thereby, only the palette and the index corresponding to the pixels in the coding unit can be bit-stream encoded, and the bit cost of the coding can be reduced.
  • the predictor can be stuffed based on each pixel information of the encoded image region; for example, the predictor can include 128 Forecast items.
  • the inventors have found that the currently used predictor is formed based on pixel information of all coded image regions, and there is a problem that the correlation between the image region to be encoded and the predictor is not high, resulting in a low prediction efficiency of the predictor; At present, the number of items in the predictor is large, and the cost of performing bit stream encoding is relatively large, and the bit cost of encoding cannot be further reduced.
  • Embodiments of the present invention provide an image encoding method and apparatus using prediction information, and an image processing apparatus.
  • the bit cost of the encoding is further reduced while improving the predictive efficiency of the predictor.
  • an image encoding method using prediction information comprising:
  • Determining whether the image region to be encoded uses first prediction information or second prediction information; wherein the first prediction information is formed based on pixel information of a plurality of encoded image regions, the second prediction information being based on the image region to be encoded Formed by pixel information of adjacent coded image regions;
  • Each pixel of the image to be encoded region is bitstream encoded using corresponding prediction information.
  • an image encoding apparatus using prediction information comprising:
  • the information determining unit determines whether the image region to be encoded uses the first prediction information or the second prediction information; wherein the first prediction information is formed based on pixel information of the plurality of encoded image regions, the second prediction information is based on Forming pixel information of an encoded image region adjacent to an image region to be encoded;
  • the bit stream encoding unit performs bit stream encoding on each pixel of the image area to be encoded using corresponding prediction information.
  • an image processing apparatus including:
  • An encoding device that determines whether the image region to be encoded uses first prediction information or second prediction information; wherein the first prediction information is formed based on pixel information of a plurality of encoded image regions, the second prediction information being based on the Forming pixel information of the encoded image region adjacent to the image region; and performing bitstream encoding on each pixel of the image region to be encoded using the corresponding prediction information;
  • Decoding means determining whether the image region to be decoded uses third prediction information or fourth prediction information; wherein the third prediction information is formed based on pixel information of the plurality of decoded image regions, the fourth prediction information being based on the Forming pixel information of decoded image regions adjacent to the image region; and performing bitstream decoding on each pixel of the image region to be decoded using corresponding prediction information.
  • a computer readable program wherein when the program is executed in an image processing apparatus, the program causes a computer to perform image encoding as described above in the image processing apparatus method.
  • a storage medium storing a computer readable program
  • the computer readable program causes a computer to perform an image encoding method as described above in an image processing apparatus.
  • the beneficial effects of the embodiment of the present invention are: determining whether the image region to be encoded uses the first prediction information or the second prediction information, and performing bitstream encoding on each pixel of the image region to be encoded using the corresponding prediction information;
  • a prediction information is formed based on pixel information of a plurality of encoded image regions, the second prediction information being formed based on pixel information of the encoded image region adjacent to the image region to be encoded.
  • FIG. 1 is a schematic diagram of an example of a coding unit according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a coded image area according to an embodiment of the present invention.
  • FIG. 3 is a schematic flow chart of an image encoding method using measurement information according to Embodiment 1 of the present invention.
  • FIG. 4 is another schematic flowchart of an image encoding method using prediction information according to Embodiment 1 of the present invention.
  • Figure 5 is a schematic diagram of an image encoding apparatus using prediction information according to Embodiment 2 of the present invention.
  • FIG. 6 is a schematic diagram of an image decoding method using prediction information according to Embodiment 3 of the present invention.
  • FIG. 7 is another schematic diagram of an image decoding method using prediction information according to Embodiment 3 of the present invention.
  • FIG. 8 is a schematic diagram of an image decoding apparatus using prediction information according to Embodiment 4 of the present invention.
  • Figure 9 is a block diagram showing the configuration of an image processing apparatus according to a fifth embodiment of the present invention.
  • FIG. 1 is a schematic diagram showing an example of a coding unit according to an embodiment of the present invention, showing a case of a coding unit (CU).
  • the coding unit has 8 ⁇ 8 pixels; pixels having the same pixel value use the same symbol to represent pixel values, such as C0, C1, ..., C8.
  • the prediction table is used to predict the current CU's palette table. If the prediction table is relatively large (for example, there are 128 items), the prediction flag used to indicate whether the prediction table is used or not is more; in addition, the prediction Each item in the table may be far away from the image area to be encoded and the correlation is not high, resulting in low efficiency of prediction.
  • the entire area to be encoded may be composed of a plurality of Largest Coding Units (LCUs), each of which is, for example, 64*64 pixels; wherein each LCU may include multiple CUs, each The CU is, for example, 8*8 pixels.
  • LCUs Largest Coding Units
  • the value in the predictor may be the last one of the previous LCU line (LCU line).
  • the pixel values in the LCU are far apart in space and correlated with B, resulting in low prediction efficiency.
  • FIG. 3 is a schematic flowchart of an image encoding method using measurement information according to an embodiment of the present invention.
  • the image encoding method includes:
  • Step 301 Determine whether the image region to be encoded uses first prediction information or second prediction information; wherein the first prediction information is formed based on pixel information of a plurality of encoded image regions, and the second prediction information is based on Forming pixel information of the encoded image region adjacent to the image region to be encoded;
  • Step 302 Perform bitstream encoding on each pixel of the image to be encoded region by using corresponding prediction information.
  • the image to be encoded area may be a current coding unit (CU) or a current maximum coding unit.
  • CU current coding unit
  • the following uses CU as an example for description.
  • the embodiment of the present invention is applicable to the case of adopting the palette mode, and the embodiment of the present invention is equally applicable to the case of mixing the palette mode and the non-palette mode (for example, the ease mode).
  • the ease mode For information on how to determine the pixels in the palette mode and how to determine the pixels in the non-palette mode, you can refer to any of the related methods.
  • the first prediction information is formed based on pixel information of a plurality of encoded image regions
  • the second prediction information is formed based on pixel information of an encoded image region (eg, Left CU) adjacent to the image region to be encoded.
  • Table 1 shows a prediction table of an embodiment of the present invention.
  • the prediction table may have, for example, 8 prediction items, each prediction item being identified by one prediction index (for example, 0, 1, ..., 7; each prediction index may be represented by 3 bits), and Each prediction term represents a pixel value.
  • each prediction item may include a plurality of color components.
  • the color component may include: a y component, a Cb component, and a Cr component; or the color component may include: an R component, a G component, or a B component.
  • the invention is not limited thereto, and for example, other color components may also be used.
  • Table 2 is a practical example of the prediction table of the embodiment of the present invention, showing the first prediction information of the embodiment of the present invention.
  • the prediction table may have, for example, 128 prediction items, each prediction item being identified by a prediction index (for example, 0, 1, ..., 127; each may be represented by 7 bits), and each The prediction term represents a pixel value that includes a plurality of color components (eg, yCbCr).
  • the first prediction information may be generated in advance, for example, predefined on the encoding device side based on empirical values; and also pre-defined on the decoding device side.
  • both the encoding side and the decoding side can know the first prediction information in advance, and the prediction information does not need to be encoded by the bit stream.
  • the prediction information can also be updated based on the encoded pixel information. For example, the latest encoded pixel information can be added to the prediction table; and the same operation can be performed on the decoding side to generate the same prediction information as the encoding side, and the prediction information is also not encoded by the bit stream.
  • the second prediction information may also be formed based on pixel information of a left image region (eg, Left CU) or an upper image region (eg, Above CU) adjacent to the image region to be encoded.
  • the number of items in the first prediction information (for example, 128) is more than the number of items in the second prediction information (for example, generally does not exceed 64).
  • second prediction information formed by each pixel information in the Left CU may be used.
  • the coded image area adjacent to the image to be coded in the embodiment of the present invention may be the left CU of the current CU (ie, the Left CU), and the embodiment of the present invention is not limited thereto.
  • the following is only an example of the Left CU.
  • the second prediction information may also be generated in advance (ie, generated before the current CU performs encoding), and updated based on the encoded pixel information.
  • the specific form of the second prediction information can be similar to the information shown in Table 2.
  • the second prediction information does not need to be encoded by the bit stream.
  • the correlation between the two is relatively high; and the number of pixels in the left image area is small, for example, the Left CU is generally 8*. With 8 pixels, the number of items of the second prediction information formed is also small (for example, generally no more than 64), so the number of bits that need to be encoded is small.
  • first prediction information and the second prediction information of the present invention are only schematically illustrated above, but the present invention is not limited thereto, and a specific implementation manner may be determined according to actual conditions. For example, the size of the prediction information and the specific content can be determined as needed.
  • FIG. 4 is another schematic flowchart of an image encoding method using prediction information according to an embodiment of the present invention. As shown in FIG. 4, the image encoding method includes:
  • Step 401 it is determined whether the image area to be encoded has a left image area; in the case of having a left image area, step 402 is performed; if there is no left image area, step 404 is performed;
  • whether the current CU has a Left CU can be determined by determining the CU_pelX value. For example, in the case where the value of CU_PelX is greater than 0, it may be determined that there is a Left CU; otherwise, it may be determined that the current CU is the first CU of a certain LCU line without the Left CU.
  • the image area to be encoded does not have the left image area, it is determined that the first prediction information is used and the bit stream encoding may not be performed on the identifier bit.
  • Step 402 determining whether the image area to be encoded uses second prediction information; performing step 405 in the case of using the second prediction information; performing step 403 in the case of not using the second prediction information;
  • the first prediction information is formed based on pixel information of a plurality of encoded image regions
  • the second prediction information is formed based on pixel information of a left image region adjacent to the image region to be encoded.
  • the cost values of the first prediction information and the second prediction information are separately calculated, and the prediction information corresponding to the use of the smaller generation value is determined.
  • Step 403 Perform bitstream coding to identify the identifier bit that uses the first prediction information.
  • whether the first prediction information or the second prediction information is used may be identified by one identification bit (eg, using LeftCUPredFlag).
  • the first prediction information 0 bit stream coding is performed, and when the second prediction information is used, 1 bit stream coding is performed.
  • the present invention is not limited thereto. For example, when the first prediction information is used, 1 bit stream coding may be performed, and when the second prediction information is used, 0 bit stream coding may be performed.
  • Step 404 Perform bitstream encoding on each pixel of the image to be encoded region by using first prediction information.
  • Step 405 Perform bitstream coding to identify the identifier bit that uses the second prediction information.
  • Step 406 Perform bitstream encoding on each pixel of the image to be encoded region by using second prediction information.
  • any one of the related techniques can be used.
  • Table 3 shows the partial pseudo code for encoding in the embodiment of the present invention.
  • Table 3 is only illustrative of the invention, but the invention is not limited thereto.
  • determining whether the image region to be encoded uses the first prediction information or the second prediction information, and performing bitstream encoding on each pixel of the image region to be encoded using the corresponding prediction information; wherein the first prediction information Formed based on pixel information of a plurality of encoded image regions, the second prediction information being formed based on pixel information of an encoded image region adjacent to the image region to be encoded.
  • An embodiment of the present invention provides an image encoding apparatus using prediction information, which corresponds to the image encoding method using prediction information in Embodiment 1, and the same content is not described herein again.
  • FIG. 5 is a schematic diagram of an image encoding apparatus using prediction information according to an embodiment of the present invention. As shown in FIG. 5, the image encoding apparatus 500 includes:
  • the information determining unit 501 determines whether the image region to be encoded uses the first prediction information or the second prediction information; wherein the first prediction information is formed based on pixel information of the plurality of encoded image regions, and the second prediction information is based on Forming pixel information of the encoded image region adjacent to the coded image region;
  • the bitstream encoding unit 502 performs bitstream encoding on each pixel of the image region to be encoded using corresponding prediction information.
  • bitstream encoding unit 502 is further configured to: perform bitstream encoding on the identifier bit used to identify whether the first prediction information or the second prediction information is used.
  • the image encoding apparatus 500 may further include:
  • the area determining unit 503 determines whether the image area to be encoded has the adjacent encoded image area
  • the information determining unit 501 directly uses the first prediction information in a case where the image area to be encoded does not have the adjacent encoded image area.
  • the adjacent coded image area is the left image area of the image area to be encoded; however, the invention is not limited thereto.
  • the number of items in the first prediction information is more than the number of items in the second prediction information; for example, the number of items in the first prediction information is 128, and the number of items in the second prediction information does not exceed 64.
  • the image encoding apparatus 500 may further include:
  • the storage unit 504 stores the first prediction information and the second prediction information that are generated in advance;
  • the updating unit 505 updates the first prediction information and the second prediction information based on the encoded pixel information.
  • determining whether the image region to be encoded uses the first prediction information or the second prediction information, and performing bitstream encoding on each pixel of the image region to be encoded using the corresponding prediction information; wherein the first prediction information Formed based on pixel information of a plurality of encoded image regions, the second prediction information being formed based on pixel information of an encoded image region adjacent to the image region to be encoded.
  • An embodiment of the present invention provides an image decoding method using prediction information, which corresponds to the image encoding method using prediction information in Embodiment 1, and the same content is not described again.
  • FIG. 6 is a schematic diagram of an image decoding method using prediction information according to an embodiment of the present invention. As shown in FIG. 6, the image decoding method includes:
  • Step 601 Determine whether the image region to be decoded uses third prediction information or fourth prediction information; wherein the third prediction information is formed based on pixel information of a plurality of decoded image regions, and the fourth prediction information is based on the Forming pixel information of decoded image regions adjacent to the image region;
  • Step 602 Perform bitstream decoding on each pixel of the image to be decoded region by using corresponding prediction information.
  • the third prediction information corresponds to the first prediction information in Embodiment 1; the fourth prediction information corresponds to the second prediction information in Embodiment 1.
  • the third prediction information is the same as the content of the first prediction information, and the fourth prediction information is the same as the content of the second prediction information.
  • FIG. 7 is another schematic diagram of an image decoding method using prediction information according to an embodiment of the present invention. As shown in FIG. 7, the image decoding method includes:
  • Step 701 it is determined whether a certain image area to be decoded has a left image area; in the case of having a left image area, step 702 is performed; if there is no left image area, step 705 is performed;
  • whether the current CU has a Left CU can be determined by determining the CU_pelX value.
  • Step 702 Obtain an identifier bit from the bitstream.
  • Step 703 it is determined whether the flag bit is 1; if it is 1, step 704 is performed; if it is 0, step 705 is performed;
  • Step 704 Perform bitstream decoding on each pixel of the image area to be decoded using the fourth prediction information.
  • Step 705 Perform bitstream decoding on each pixel of the image area to be decoded using the third prediction information.
  • FIG. 7 is only schematically illustrated.
  • the third prediction information may be used in the case where the flag bit is 1, and the fourth prediction information is used in the case where the flag bit is 0.
  • the present invention is not limited thereto, and a specific implementation manner may be determined according to actual scenarios.
  • the to-be-decoded image region uses the third prediction information or the fourth prediction information, and performing bitstream decoding according to the corresponding prediction information; wherein the third prediction information is based on pixel information of the plurality of decoded image regions.
  • the fourth prediction information is formed based on pixel information of the decoded image region adjacent to the image region to be decoded. Therefore, not only can the prediction efficiency of the predictor be improved, but also One step reduces the bit cost of encoding and decoding.
  • An embodiment of the present invention provides an image decoding apparatus using prediction information, which corresponds to the image decoding method using prediction information in Embodiment 3, and the same content is not described herein again.
  • FIG. 8 is a schematic diagram of an image decoding apparatus using prediction information according to an embodiment of the present invention. As shown in FIG. 8, the image decoding apparatus 800 includes:
  • the information determining unit 801 determines whether the image region to be decoded uses third prediction information or fourth prediction information; wherein the third prediction information is formed based on pixel information of a plurality of decoded image regions, the fourth prediction information is based on Forming pixel information of the decoded image region adjacent to the decoded image region;
  • the bit stream decoding unit 802 performs bit stream decoding on each pixel of the image area to be decoded using the corresponding prediction information.
  • the decoding apparatus 800 may further include:
  • the area determining unit 803 determines whether the image area to be decoded has the adjacent decoded image area
  • the information determining unit 801 directly uses the first prediction information in a case where the image area to be decoded does not have the adjacent decoded image area.
  • the adjacent decoded image region is the left image region of the image region to be decoded; however, the present invention is not limited thereto.
  • the number of items in the third prediction information is more than the number of items in the fourth prediction information; for example, the number of items in the third prediction information is 128, and the number of items in the fourth prediction information does not exceed 64.
  • the decoding apparatus 800 may further include:
  • the storage unit 804 stores the third prediction information and the fourth prediction information that are generated in advance;
  • the updating unit 805 updates the third prediction information and the fourth prediction information based on the decoded pixel information.
  • determining whether the to-be-decoded image region uses the third prediction information or the fourth prediction information, and performing bitstream decoding according to the corresponding prediction information; wherein the third prediction information is based on pixel information of the plurality of decoded image regions.
  • the fourth prediction information is formed based on pixel information of the decoded image region adjacent to the image region to be decoded.
  • An embodiment of the present invention provides an image processing apparatus, comprising: the image encoding apparatus according to Embodiment 2 and/or the image decoding apparatus as described in Embodiment 4.
  • FIG. 9 is a block diagram showing the configuration of an image processing apparatus according to an embodiment of the present invention.
  • the image processing apparatus 900 may include a central processing unit (CPU) 100 and a memory 110; the memory 110 is coupled to the central processing unit 100.
  • the memory 110 can store various data; in addition, a program for information processing is stored, and the program is executed under the control of the central processing unit 100.
  • the functionality of image encoding device 500 may be integrated into central processor 100.
  • the central processing unit 100 can be configured to implement the image encoding method as described in Embodiment 1.
  • the functions of the image decoding device 800 can also be integrated into the central processing unit 100.
  • the central processing unit 100 can be configured to implement the image decoding method as described in Embodiment 3.
  • the image encoding device 500 and/or the image decoding device 800 may be configured separately from the central processing unit, for example, the image encoding device 500 and/or the image decoding device 800 may be configured as a chip connected to the central processing unit 100.
  • the functions of the image encoding device 500 and/or the image decoding device 800 are implemented by control of a central processing unit.
  • the image processing apparatus 900 may further include: an input and output unit 120, a display unit 130, and the like; wherein the functions of the above components are similar to those of the prior art, and details are not described herein again. It is to be noted that the image processing apparatus 900 does not necessarily have to include all of the components shown in FIG. 9; in addition, the image processing apparatus 900 may further include components not shown in FIG. 9, and reference may be made to the related art.
  • the embodiment of the present invention further provides a computer readable program, wherein when the program is executed in an image processing apparatus, the program causes a computer to execute the image encoding method as described in Embodiment 1 in the image processing apparatus and / or the image decoding method as described in embodiment 3.
  • the embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes the computer to execute the image encoding method as described in Embodiment 1 in the image processing device and/or as in Embodiment 3 The image decoding method described.
  • the above apparatus and method of the present invention may be implemented by hardware or by hardware in combination with software.
  • the present invention relates to a computer readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to cause the logic component to implement the various methods described above Or steps.
  • the present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like.
  • One or more of the functional blocks described in the figures and/or one or more combinations of functional blocks may be implemented as a general purpose processor, digital signal processor (DSP) for performing the functions described herein.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • One or more of the functional blocks described with respect to the figures and/or one or more combinations of functional blocks may also be implemented as a combination of computing devices, eg, a combination of a DSP and a microprocessor, multiple microprocessors One or more microprocessors in conjunction with DSP communication or any other such configuration.

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Abstract

L'invention concerne un procédé et un appareil de codage d'image à l'aide d'informations de prédiction, ainsi qu'un dispositif de traitement d'image. Le procédé de codage d'image consiste à : déterminer qu'une région d'image à coder utilise des premières informations de prédiction ou des secondes informations de prédiction, les premières informations de prédiction étant formées sur la base d'informations de pixel concernant une pluralité de régions d'image codées, et les secondes informations de prédiction étant formées sur la base des informations de pixel concernant les régions d'image codées adjacentes à la région d'image à coder ; et utiliser des informations de prédiction correspondantes pour réaliser un codage de train de bits sur différents pixels de la région d'image à coder. Ainsi, non seulement l'efficacité de prédiction d'un dispositif de prédiction peut être améliorée, mais également les coûts de bit pour un codage peuvent être davantage réduits.
PCT/CN2015/080638 2015-06-03 2015-06-03 Procédé et appareil de codage d'image à l'aide d'informations de prédiction et dispositif de traitement d'image Ceased WO2016192055A1 (fr)

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US20050008224A1 (en) * 2000-01-27 2005-01-13 Caruso Robert M. Image compression usable with animated images
CN103281538A (zh) * 2013-06-06 2013-09-04 上海交通大学 基于滚动哈希和块级别帧内预测的帧内编码方法
CN104244007A (zh) * 2013-06-13 2014-12-24 上海天荷电子信息有限公司 基于任意形状匹配的图像压缩方法和装置
CN104427338A (zh) * 2013-09-07 2015-03-18 上海天荷电子信息有限公司 一种使用块匹配的图像压缩方法和装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050008224A1 (en) * 2000-01-27 2005-01-13 Caruso Robert M. Image compression usable with animated images
CN103281538A (zh) * 2013-06-06 2013-09-04 上海交通大学 基于滚动哈希和块级别帧内预测的帧内编码方法
CN104244007A (zh) * 2013-06-13 2014-12-24 上海天荷电子信息有限公司 基于任意形状匹配的图像压缩方法和装置
CN104427338A (zh) * 2013-09-07 2015-03-18 上海天荷电子信息有限公司 一种使用块匹配的图像压缩方法和装置

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