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WO2016192054A1 - Procédé et appareil de codage d'image utilisant des informations de prédiction et dispositif de traitement d'image - Google Patents

Procédé et appareil de codage d'image utilisant des informations de prédiction et dispositif de traitement d'image Download PDF

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Publication number
WO2016192054A1
WO2016192054A1 PCT/CN2015/080637 CN2015080637W WO2016192054A1 WO 2016192054 A1 WO2016192054 A1 WO 2016192054A1 CN 2015080637 W CN2015080637 W CN 2015080637W WO 2016192054 A1 WO2016192054 A1 WO 2016192054A1
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Prior art keywords
image
prediction information
encoded
information
lcu
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PCT/CN2015/080637
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English (en)
Chinese (zh)
Inventor
叶姜莉
付轩
王争
朱建清
Original Assignee
富士通株式会社
叶姜莉
付轩
王争
朱建清
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Application filed by 富士通株式会社, 叶姜莉, 付轩, 王争, 朱建清 filed Critical 富士通株式会社
Priority to PCT/CN2015/080637 priority Critical patent/WO2016192054A1/fr
Publication of WO2016192054A1 publication Critical patent/WO2016192054A1/fr

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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
    • 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

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:
  • first prediction information is formed based on pixel information of a plurality of encoded image regions, the second prediction information being based on a first image Forming pixel information of the encoded image area;
  • 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 selection unit determines whether to use the first prediction information or the second prediction information according to the location of the image region to be encoded; wherein the first prediction information is formed based on pixel information of the plurality of encoded image regions, the second prediction information Formed based on pixel information of the first column of encoded image regions in the image;
  • 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 selects whether to use first prediction information or second prediction information according to a location of an image region to be encoded; wherein the first prediction information is formed based on pixel information of a plurality of encoded image regions, the second prediction information is based on an image Forming pixel information of the first column of the encoded image region; and performing bitstream encoding on each pixel of the image region to be encoded using the corresponding prediction information;
  • Decoding means whether to use third prediction information or fourth prediction information according to a location of an image region to be decoded; wherein the third prediction information is formed based on pixel information of a plurality of decoded image regions, the fourth prediction information being based on an image Forming pixel information of the first column of the encoded image region; and performing bitstream decoding on each pixel of the image region to be decoded using the 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.
  • An advantageous effect of the embodiment of the present invention is to select whether to use the first prediction information or the second prediction information according to the location of the image region to be encoded, and perform bitstream encoding on each pixel of the image region to be encoded using the corresponding 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 the first column of encoded image regions in the image.
  • 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 a schematic diagram of a coded image area according to Embodiment 1 of the present invention.
  • FIG. 5 is another schematic flowchart of an image encoding method using prediction information according to Embodiment 1 of the present invention.
  • FIG. 6 is a schematic diagram of an image encoding apparatus using prediction information according to Embodiment 2 of the present invention.
  • FIG. 7 is a schematic diagram of an image decoding method using prediction information according to Embodiment 3 of the present invention.
  • FIG. 8 is another schematic diagram of an image decoding method using prediction information according to Embodiment 3 of the present invention.
  • FIG. 9 is a schematic diagram of an image decoding apparatus using prediction information according to Embodiment 4 of the present invention.
  • Figure 10 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 The items in the table may be far apart from the image area to be encoded (for example, the current CU) 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 LCU of the previous LCU line (LCU line). The pixel values in the space are far apart in space and the correlation with A is low, 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 Select whether to use first prediction information or second prediction information according to a location of an image region to be encoded; 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 an image. Forming pixel information of the encoded image region in the first column;
  • Step 302 Perform bitstream encoding on each pixel of the image to be encoded region by using corresponding prediction information.
  • the image area to be encoded may be a current coding unit (CU), and the following uses CU as an example for description.
  • CU current coding unit
  • 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 the plurality of encoded image regions
  • the second prediction information is formed based on pixel information of the encoded image region in the first LCU column in the image.
  • 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 the pixel information of the encoded image region in the first LCU column in the image. For example, when encoding the current CU (ie, A) as shown in FIG. 2, second prediction information formed by each pixel information in one or more LCUs on the upper side of A may be used.
  • the embodiment of the present invention may determine the first prediction based on pixel information of all coded image regions (eg, LCU 11 to LCU(m-1)n) before the current CU (as shown in FIG. 4).
  • Information based on the first LCU of each LCU line before the current CU (eg LCU line 1, ..., LCU line (m-1)) (eg LCU 11, LCU 21, ..., LCU (m-1) 1
  • the pixel information determines the second prediction information.
  • 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 prediction information may be determined according to the position of the image region to be encoded, whereby the correlation between the content in the prediction information and the image region to be encoded is high; and the number of items in the second prediction information is small Therefore, 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, it can be determined as needed The size and specific content of the forecast information.
  • FIG. 5 is another schematic diagram of an image encoding method using prediction information according to an embodiment of the present invention. As shown in FIG. 5, the image encoding method includes:
  • Step 501 Determine whether the image area to be encoded is located in a first LCU of a certain LCU line; if the image area to be encoded is located in a first LCU of a certain LCU line, perform step 502, where the If the coded image area is not located in the first LCU of a certain LCU row, step 503 is performed;
  • whether the current CU is located in the first LCU of a certain LCU line can be determined by determining the CU_pelX value. For example, in the case where the value of CU_PelX is less than 64, it may be determined that it is located in the first LCU of a certain LCU row; otherwise, it may be determined that the current CU is not located in the first LCU of a certain LCU row.
  • Step 502 Perform bitstream encoding on each pixel of the image to be encoded region by using second prediction information.
  • Step 503 Perform bitstream encoding on each pixel of the image to be encoded region by using first prediction information.
  • any one of the related techniques can be used.
  • the present invention is only described by taking an 8*8 pixel CU and a 64*64 pixel LCU as an example.
  • the present invention is not limited thereto, and other sizes of coding units may also be used; for example, Use Coding Tree Unit (CTU).
  • CTU Use Coding Tree Unit
  • the first prediction information or the second prediction information is used according to the location of the image region to be encoded, and the pixels of the to-be-coded image region are bit-stream 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 first column of encoded image regions in the image.
  • 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. 6 is a schematic diagram of an image encoding apparatus using prediction information according to an embodiment of the present invention. As shown in FIG. 6, the image encoding apparatus 600 includes:
  • the information selection unit 601 determines whether to use the first prediction information or the second prediction information according to the location of the image region to be encoded; wherein the first prediction information is formed based on pixel information of the plurality of encoded image regions, The second prediction information is formed based on pixel information of the first column of coded image regions in the image;
  • the bitstream encoding unit 602 performs bitstream encoding on each pixel of the image region to be encoded using corresponding prediction information.
  • the image area to be encoded may be a CU
  • the first column of coded image areas in the image may be the first LCU of each encoded LCU line.
  • the information selection unit 601 may include (not shown):
  • a determining unit determining whether the image area to be encoded is located in a first LCU of a certain LCU line
  • Determining in the case that the image region to be encoded is located in a first LCU of a certain LCU row, determining to use the second prediction information; in the image region to be encoded, not in the first row of a certain LCU row In the case of one LCU, it is determined to use the first prediction information.
  • the image encoding apparatus 600 may further include:
  • the storage unit 603 stores the first prediction information and the second prediction information that are generated in advance;
  • the updating unit 604 updates the first prediction information and the second prediction information based on the encoded pixel information.
  • the first prediction information or the second prediction information is used according to the location of the image region to be encoded, and the pixels of the to-be-coded image region are bit-stream 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 first column of encoded image regions in the image.
  • 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. 7 is a 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 Select whether to use third prediction information or fourth prediction information according to a location of an image region to be decoded; 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 an image. Forming pixel information of the encoded image region in the first column;
  • Step 702 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 Corresponding to the second prediction information in the first embodiment.
  • the third prediction information is the same as the content of the first prediction information
  • the fourth prediction information is the same as the content of the second prediction information.
  • FIG. 8 is another schematic diagram of an image decoding method using prediction information according to an embodiment of the present invention. As shown in FIG. 8, the image decoding method includes:
  • Step 801 Determine whether the image area to be decoded is located in a first LCU of a certain LCU row; if the image area to be decoded is located in a first LCU of a certain LCU row, perform step 802, where the If the decoded image area is not located in the first LCU of a certain LCU row, step 803 is performed;
  • whether the current CU is located in the first LCU of a certain LCU line can be determined by determining the CU_pelX value. For example, in the case where the value of CU_PelX is less than 64, it may be determined that it is located in the first LCU of a certain LCU row; otherwise, it may be determined that the current CU is not located in the first LCU of a certain LCU row.
  • Step 802 Perform bitstream decoding on each pixel of the image to be decoded region by using fourth prediction information.
  • Step 803 Perform bitstream decoding on each pixel of the image to be decoded region by using third prediction information.
  • any one of the related techniques can be used.
  • the third prediction information or the fourth prediction information is used according to the location of the image region to be decoded, and the bit stream decoding is performed according to the corresponding prediction information; wherein the third prediction information is based on the plurality of decoded image regions.
  • the pixel information is formed, and the fourth prediction information is formed based on pixel information of the first column of coded image regions in the image.
  • 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. 9 is a schematic diagram of an image decoding apparatus using prediction information according to an embodiment of the present invention.
  • the image decoding apparatus 900 includes:
  • the information selection unit 901 selects whether to use the third prediction information or the fourth prediction information according to the location of the image region to be decoded; wherein the third prediction information is formed based on pixel information of the plurality of decoded image regions, the fourth prediction information Formed based on pixel information of the first column of decoded image regions in the image;
  • the bit stream decoding unit 902 performs, for each pixel of the image area to be decoded, using corresponding prediction information. Bitstream decoding.
  • the image area to be decoded may be a CU
  • the first column of decoded image regions in the image may be the first LCU of each LCU row that has been decoded.
  • the information selection unit 901 may include (not shown in the figure):
  • a determining unit determining whether the image area to be decoded is located in a first LCU of a certain LCU line
  • Determining in the case that the image region to be decoded is located in a first LCU of a certain LCU row, determining to use the second prediction information; and not in the image region to be decoded that is not located in a certain LCU row In the case of one LCU, it is determined to use the first prediction information.
  • the image decoding apparatus 900 may further include:
  • the storage unit 903 stores the third prediction information and the fourth prediction information that are generated in advance;
  • the updating unit 904 updates the third prediction information and the fourth prediction information based on the decoded pixel information.
  • the third prediction information or the fourth prediction information is used according to the location of the image region to be decoded, and the bit stream decoding is performed according to the corresponding prediction information; wherein the third prediction information is based on the plurality of decoded image regions.
  • the pixel information is formed, and the fourth prediction information is formed based on pixel information of the first column of coded image regions in the image.
  • 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. 10 is a block diagram showing the configuration of an image processing apparatus according to an embodiment of the present invention.
  • the image processing apparatus 1000 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 600 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 900 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.
  • image encoding device 600 and/or image decoding device 900 may be centrally located
  • the image encoding device 600 and/or the image decoding device 900 may be configured as a chip connected to the central processing unit 100, and the image encoding device 600 and/or the image decoding device 900 may be implemented by control of the central processing unit.
  • the image processing apparatus 1000 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 are not described herein again. It is to be noted that the image processing apparatus 1000 does not necessarily have to include all the components shown in FIG. 10; in addition, the image processing apparatus 1000 may further include components not shown in FIG. 10, 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 utilisant des informations de prédiction et un dispositif de traitement d'image. Le procédé de codage d'image consiste à : choisir d'utiliser des premières informations de prédiction et des secondes informations de prédiction selon la position d'une région d'image à coder, 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 une région d'image codée dans une première colonne dans une image ; 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 binaires pour un codage peuvent être davantage réduits.
PCT/CN2015/080637 2015-06-03 2015-06-03 Procédé et appareil de codage d'image utilisant des informations de prédiction et dispositif de traitement d'image WO2016192054A1 (fr)

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CN104202612A (zh) * 2014-04-15 2014-12-10 清华大学深圳研究生院 基于四叉树约束的编码单元的划分方法及视频编码方法
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CN103688533A (zh) * 2011-06-20 2014-03-26 联发科技（新加坡）私人有限公司 可减少行存储器的色度帧内预测方法及装置
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