WO2020252726A1 - Procédé et dispositif de codage et de décodage d'image et dispositif de codage et de décodage de vidéo - Google Patents

Procédé et dispositif de codage et de décodage d'image et dispositif de codage et de décodage de vidéo Download PDF

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WO2020252726A1
WO2020252726A1 PCT/CN2019/092005 CN2019092005W WO2020252726A1 WO 2020252726 A1 WO2020252726 A1 WO 2020252726A1 CN 2019092005 W CN2019092005 W CN 2019092005W WO 2020252726 A1 WO2020252726 A1 WO 2020252726A1
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size
unit
coding unit
transformation
coding
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PCT/CN2019/092005
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English (en)
Chinese (zh)
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蔡文婷
朱建清
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富士通株式会社
蔡文婷
朱建清
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Priority to PCT/CN2019/092005 priority Critical patent/WO2020252726A1/fr
Publication of WO2020252726A1 publication Critical patent/WO2020252726A1/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
    • H04N19/12—Selection from among a plurality of transforms or standards, e.g. selection between discrete cosine transform [DCT] and sub-band transform or selection between H.263 and H.264
    • H04N19/122—Selection of transform size, e.g. 8x8 or 2x4x8 DCT; Selection of sub-band transforms of varying structure or type
    • 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
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction

Definitions

  • the embodiments of the present application relate to the technical field of video coding.
  • each CTU contains a luminance component (which can be called a luminance CTU) And chrominance component (can be called chrominance CTU).
  • a dual-tree partition structure or a single-tree partition structure can be used to divide the luminance CTU and chrominance CTU into coding units (CU, Coding Unit, or also called coding block CB). ).
  • CU Coding Unit
  • the luminance CTU and the chrominance CTU share one division indication information; for the two tree division structures, the luminance CTU and the chrominance CTU each use independent division indication information.
  • the CU obtained after division includes a luminance component (may be called a luminance CU) and a chrominance component (may be called a chrominance CU).
  • transform is applied to residual coefficients generated by inter-frame prediction or intra-frame prediction, that is, the residuals remaining between the original block and its prediction block are transformed into transform coefficients, and the transform coefficients are quantized and encoded into the bitstream .
  • the size of the current CU or called the size
  • TU Transform Unit
  • the transform block TB the size of the largest transform unit
  • embodiments of the present application provide an image encoding and decoding method, device, and video encoding and decoding device.
  • an image encoding method including:
  • the luminance component coding unit and the chrominance component coding unit of the CU are respectively divided according to the size of the largest TU;
  • Encoding is performed according to the divided luminance component coding unit and chrominance component coding unit.
  • an image encoding device including:
  • a determining part which determines whether the size of the CU exceeds the size of the largest TU during the transformation and quantization process of image coding
  • a dividing unit which divides the luma component coding unit and the chroma component coding unit of the CU according to the size of the largest TU when the size of the CU exceeds the size of the largest TU;
  • the encoding unit performs encoding according to the divided luminance component coding unit and chrominance component coding unit.
  • an image decoding method including:
  • the luminance component coding unit and the chrominance component coding unit of the CU are respectively divided according to the size of the largest TU;
  • Decoding is performed according to the divided luminance component coding unit and chrominance component coding unit.
  • an image decoding device including:
  • the determining part which determines whether the size of the CU exceeds the size of the largest TU during the inverse transformation and dequantization process of image decoding
  • a dividing unit which divides the luma component coding unit and the chroma component coding unit of the CU according to the size of the largest TU when the size of the CU exceeds the size of the largest TU;
  • the decoding unit performs decoding according to the divided luminance component coding unit and chrominance component coding unit.
  • a video encoding and decoding device including:
  • the encoder determines whether the size of the CU exceeds the size of the largest TU during the transformation and quantization process of image encoding; in the case that the size of the CU exceeds the size of the largest TU, the luminance component of the CU is encoded according to the size of the largest TU.
  • chrominance component coding unit for division and coding according to the divided luminance component coding unit and chrominance component coding unit;
  • the decoder determines whether the size of the CU exceeds the size of the largest TU during the inverse transformation and dequantization process of image decoding; in the case that the size of the CU exceeds the size of the largest TU, the luminance component of the CU is calculated according to the size of the largest TU.
  • the coding unit and the chrominance component coding unit are divided; and the decoding is performed according to the divided luminance component coding unit and the chrominance component coding unit.
  • One of the beneficial effects of the embodiments of the present application is: when the size of the CU exceeds the size of the largest TU, the luminance CU and the chrominance CU are divided according to the size of the largest TU; thus, the chrominance CU can be divided into The chrominance TU with the same size as the maximum TU can not only improve the compression efficiency, but also improve the coding performance of the chrominance component.
  • Figure 1 is a schematic diagram of the division structure of two trees and the division structure of a single tree
  • Fig. 2 is a diagram showing an example in which some transform coefficients of a 64 ⁇ 64 TU are cleared
  • Fig. 3 is a schematic diagram of an image coding method according to an embodiment of the present application.
  • FIG. 4 is an example diagram of dividing a 128 ⁇ 128 CU into TUs according to an embodiment of the present application
  • FIG. 5 is an example diagram of dividing a 256 ⁇ 256 CU into TUs according to an embodiment of the present application
  • Fig. 6 is a schematic diagram of an image decoding method according to an embodiment of the present application.
  • Fig. 7 is a schematic diagram of an image coding device according to an embodiment of the present application.
  • Fig. 8 is a schematic diagram of an image decoding device according to an embodiment of the present application.
  • Fig. 9 is a schematic diagram of an encoder/decoder according to an embodiment of the present application.
  • the terms “first”, “second”, etc. are used to distinguish different elements from the terms, but they do not indicate the spatial arrangement or temporal order of these elements. These elements should not be used by these terms. Limited.
  • the term “and/or” includes any and all combinations of one or more of the associated listed terms.
  • the terms “comprising”, “including”, “having” and the like refer to the existence of the stated features, elements, elements or components, but do not exclude the presence or addition of one or more other features, elements, elements or components.
  • Figure 1 is a schematic diagram of the division structure of two trees and the division structure of a single tree. As shown on the left side of Figure 1, for the division of two trees, the luminance CTU and the chrominance CTU have their own division flags.
  • the CTU can be divided into a quaternary tree first; After the tree is divided, each node is independently divided into a multi-type tree (MTT, Multi-Type Tree).
  • MTT Multi-Type Tree
  • the luminance CTU and the chrominance CTU share the division flag, and the CTU can be divided into a quadtree first; then, the same for each node after the quadtree division MTT division is performed locally.
  • MTT division includes vertical binary tree (BT, binary tree) division (SPLIT_BT_VER), horizontal binary tree division (SPLIT_BT_HOR), vertical ternary tree (TT, ternary tree) division (SPLIT_TT_VER), and horizontal ternary tree division (SPLIT_TT_VER).
  • BT binary tree
  • SPLIT_BT_VER horizontal binary tree division
  • SPLIT_TT_VER vertical ternary tree division
  • SPLIT_TT_VER horizontal ternary tree division
  • SPLIT_TT_VER horizontal ternary tree division
  • Split SPLIT_TT_HOR
  • the root of the quadtree is associated with the CTU, and the quadtree blocks are divided until the MTT is determined. MTT is divided recursively until reaching the leaf node, which means that CTU has been divided into CU.
  • the larger-size CU needs to be divided into several TUs during the transformation and quantization process. For example, for inter slices, if the size of the largest TU of the Y component is equal to 64 ⁇ 64, then a 128 ⁇ 128 CU with three components in the 4:2:0 format will be divided into four A single tree partition structure of 64 ⁇ 64 luminance TU and eight 32 ⁇ 32 chrominance TUs. However, the 32 ⁇ 32 chroma TU is not conducive to further improving the compression efficiency.
  • Fig. 2 is an example diagram in which some transform coefficients of a 64 ⁇ 64 TU are cleared. As shown in Fig. 2, Residual_Coeff[] represents residual coefficients, and transformed_Coeff[] represents transform coefficients.
  • FIG. 3 is a schematic diagram of an image coding method according to an embodiment of the present application, and a CU is explained from the coding end. As shown in Figure 3, the method includes:
  • Figure 3 above only schematically illustrates part of the relevant content of the embodiments of the present application, but the present application is not limited thereto.
  • the order of execution among various operations can be appropriately adjusted, and some other operations can be added or some operations can be reduced.
  • Those skilled in the art can make appropriate modifications based on the above content, and are not limited to the description of FIG. 3 above.
  • the image coding uses inter-frame prediction, but the application is not limited thereto.
  • P and B frames use a single tree division structure, and coding blocks can use intra-frame prediction or inter-frame prediction.
  • a CU is subjected to processing such as prediction to obtain residual coefficients.
  • the CU may be divided into multiple TBs, and operations such as transformation and quantization are performed for each TB.
  • operations such as transformation and quantization are performed for each TB.
  • For specific content such as residual coefficients and DCT and how to transform, quantize, and encode, you can refer to related technologies.
  • the size of the CU does not exceed the size of the largest TU, the existing technology can be used for subsequent processing, which will not be repeated here.
  • the size of the largest TU may be predetermined.
  • the size of the largest TU may be specified as 64 ⁇ 64, but the embodiment of the present application is not limited thereto.
  • the luminance component coding unit of the CU (may be called a luminance CU) is divided into a plurality of luminance component transformation units (may be called a luminance TU), and the size of the luminance TU is equal to the size of the largest TU; and in the CU If the size of the chroma component coding unit (can be called chroma CU) does not exceed the size of the largest TU, the size of the chroma CU remains unchanged; when the size of the chroma CU exceeds the size of the largest TU, the chroma The degree CU is divided into multiple chroma TUs, and the size of the chroma TU is equal to the size of the largest TU.
  • FIG. 4 is an example diagram of dividing a 128 ⁇ 128 CU into TUs according to an embodiment of the present application, taking the encoding of an inter-frame slice in a 4:2:0 format as an example.
  • the CU includes a 128 ⁇ 128 luma CU (Y component), a 64 ⁇ 64 chroma CU (U component), and a 64 ⁇ 64 chroma CU (V component).
  • the Y component is divided into four 64 ⁇ 64 luma TUs, correspondingly, the U component is divided into four 32 ⁇ 32 chroma TUs , The V component is divided into four 32 ⁇ 32 chroma TUs, so the size of the chroma TU is smaller.
  • the Y component is divided into four 64 ⁇ 64 luminance TUs, and the size of the U component and the V component are both 64 ⁇ 64, which is equal to the size of the largest TU, then the U component The dimensions of the and V components remain unchanged. That is, as shown in FIG. 4, the U component is divided into a 64 ⁇ 64 chroma TU, and the V component is divided into a 64 ⁇ 64 chroma TU, so the size of the chroma TU is larger.
  • Fig. 5 is an example diagram of dividing a 256 ⁇ 256 CU into TUs according to an embodiment of the present application, taking the coding of an inter-frame slice in a 4:2:0 format as an example.
  • the CU includes a 256 ⁇ 256 luma CU (Y component), a 128 ⁇ 128 chroma CU (U component), and a 128 ⁇ 128 chroma CU (V component).
  • the Y component is divided into sixteen 64 ⁇ 64 luminance TUs, and accordingly, the U component is divided into sixteen 32 ⁇ 32 colors.
  • the degree TU, V component is divided into sixteen 32 ⁇ 32 chroma TUs, so the size of the chroma TU is smaller.
  • the Y component is divided into sixteen 64 ⁇ 64 luminance TUs, and the size of the U component and the V component are both 128 ⁇ 128. If the size of the largest TU is exceeded, U The size of the component and the V component still needs to be further divided.
  • the embodiment of the application separately divides the luminance CU and the chrominance CU; that is, as shown in FIG. 5, the U component is divided into four 64 ⁇ 64 chrominance TUs, and the V component is divided into four 64 ⁇ 64 The size of the chromaticity TU is larger.
  • the chroma CU can be divided into chroma TUs with the same size as the maximum TU, which not only improves the compression efficiency, but also improves the coding performance of the chroma components.
  • the above description only uses the 4:2:0 format as an example, but the embodiment of the present application is not limited to this.
  • the 4:2:2 format or the 4:4:4 format is also applicable to the embodiments of the present application.
  • the residuals in each TU will be input into a two-dimensional N ⁇ N matrix, where N is equal to the size of the largest TU.
  • the obtained N ⁇ N transform coefficients can be quantized to obtain quantized transform coefficients.
  • the relevant information is encoded into the bit stream and sent to the decoding end.
  • bitstream encoding of image information such as prediction information and residual coefficients in the image area to be encoded can be implemented using solutions in related technologies, which are not limited in this application.
  • the decoder can receive the bit stream accordingly and decode it accordingly. For example, at the decoder, if the CU satisfies the maximum TB division condition, it is divided in the same way as the encoder. Then the quantized transform coefficients are dequantized, and the two-dimensional N ⁇ N inverse transform is applied to the dequantized transform coefficients to obtain the residual block of the quantized sample, which is then added to the inter-frame prediction sample to obtain the reconstructed block.
  • the indication information for indicating the division of the CU may be encoded; the indication information indicates the division according to the size of the largest TU when the size of the CU exceeds the size of the largest TU. Therefore, it is possible to flexibly choose whether to implement this method.
  • 1 bit can be set to indicate, 1 represents the method of implementing the embodiment of this application, that is, when the size of the CU exceeds the size of the largest TU, it is divided according to the size of the largest TU, and 0 represents that the structure is still divided according to a single tree. Way; the value of this bit can be compiled into the bitstream.
  • the luma CU and the chroma CU are divided according to the size of the largest TU; the chroma CU can be divided into the same chroma as the largest TU size TU can not only improve compression efficiency, but also improve the coding performance of chrominance components.
  • the embodiment of the present application also provides an image decoding method, and the same content as in the embodiment of the first aspect will not be repeated.
  • the area of the image to be processed is still referred to as a coding unit (CU), but the present application is not limited to this, for example, it may also be referred to as a decoding unit.
  • CU coding unit
  • Fig. 6 is a schematic diagram of an image decoding method according to an embodiment of the present application, and a CU is explained from the decoding end. As shown in Figure 6, the method includes:
  • 601 In the process of inverse transformation and dequantization of image decoding, determine whether the size of the CU exceeds the size of the largest TU;
  • 603 Perform decoding according to the divided luminance component coding unit and chrominance component coding unit.
  • Figure 6 above only schematically illustrates part of the relevant content of the embodiments of the present application, but the present application is not limited thereto.
  • the order of execution among various operations can be appropriately adjusted, and some other operations can be added or some operations can be reduced.
  • Those skilled in the art can make appropriate modifications based on the above content, and are not limited to the description of FIG. 6 above.
  • the luma CU is divided into a plurality of luma TUs, the size of the luma TU is equal to the size of the largest TU, and the size of the chroma CU does not exceed the size of the largest TU. Change; In the case where the size of the chroma CU exceeds the size of the largest TU, the chroma CU is divided into multiple chroma TUs, and the size of the chroma TU is equal to the size of the largest TU.
  • the indication information for indicating the division of the CU is also decoded; the indication information indicates that the division is performed according to the size of the largest TU when the size of the CU exceeds the size of the largest TU.
  • the image decoding uses inter-frame prediction, but the application is not limited thereto.
  • the luma CU and the chroma CU are divided according to the size of the largest TU; the chroma CU can be divided into the same chroma as the largest TU size TU can not only improve compression efficiency, but also improve the coding performance of chrominance components.
  • the embodiment of the present application also provides an image encoding device, and the same content as in the embodiment of the first aspect will not be repeated.
  • FIG. 7 is a schematic diagram of an image encoding device according to an embodiment of the present application. As shown in FIG. 7, the image encoding device 700 includes:
  • the determining unit 701 which determines whether the size of the CU exceeds the size of the largest TU during the transformation and quantization process of image coding;
  • a dividing unit 702 which divides the luma component coding unit and the chroma component coding unit of the CU according to the size of the largest TU when the size of the CU exceeds the size of the largest TU;
  • the encoding unit 703 performs encoding according to the divided luminance component coding unit and chrominance component coding unit.
  • the luminance component coding unit (luminance CU) of the CU is divided into a plurality of luminance component transformation units (luminance TU), the size of the luminance TU is equal to the size of the largest TU; and the size of the chrominance CU does not exceed In the case of the size of the largest TU, the size of the chroma CU remains unchanged; in the case that the size of the chroma CU exceeds the size of the largest TU, the chroma CU is divided into multiple chroma TUs, and the size of the chroma TU is equal to The size of the largest TU.
  • the encoding unit 703 also encodes indication information for indicating the division of the CU; the indication information indicates that the division is carried out according to the size of the largest TU when the size of the CU exceeds the size of the largest TU.
  • the image coding uses inter-frame prediction, but the application is not limited thereto.
  • the image encoding device 700 may also include other components or modules, and for the specific content of these components or modules, reference may be made to related technologies.
  • FIG. 7 only exemplarily shows the connection relationship or signal direction between various components or modules, but it should be clear to those skilled in the art that various related technologies such as bus connection can be used.
  • the foregoing components or modules may be implemented by hardware facilities such as processors and memories; the implementation of this application does not limit this.
  • the luma CU and the chroma CU are divided according to the size of the largest TU; the chroma CU can be divided into the same chroma as the largest TU size.
  • TU can not only improve compression efficiency, but also improve the coding performance of chrominance components.
  • the embodiment of the present application also provides an image decoding device, and the same content as in the embodiment of the second aspect will not be repeated.
  • FIG. 8 is a schematic diagram of an image decoding device according to an embodiment of the present application. As shown in FIG. 8, the image decoding device 800 includes:
  • the determining unit 801 which determines whether the size of the CU exceeds the size of the largest TU during the inverse transform and dequantization process of image decoding;
  • a dividing unit 802 which divides the luminance component coding unit and the chrominance component coding unit of the CU according to the size of the largest TU when the size of the CU exceeds the size of the largest TU;
  • the decoding unit 803 performs decoding according to the divided luminance component coding unit and chrominance component coding unit.
  • the luminance component coding unit (luminance CU) of the CU is divided into a plurality of luminance component transformation units (luminance TU), the size of the luminance TU is equal to the size of the largest TU; and the size of the chrominance CU does not exceed In the case of the size of the largest TU, the size of the chroma CU remains unchanged; in the case that the size of the chroma CU exceeds the size of the largest TU, the chroma CU is divided into multiple chroma TUs, and the size of the chroma TU is equal to The size of the largest TU.
  • the decoding unit 803 also decodes indication information used to indicate the division of the CU; the indication information indicates the division according to the size of the maximum TU when the size of the CU exceeds the size of the maximum TU.
  • the image decoding uses inter-frame prediction, but the application is not limited thereto.
  • the image decoding device 800 may also include other components or modules, and for the specific content of these components or modules, reference may be made to related technologies.
  • FIG. 8 only exemplarily shows the connection relationship or signal direction between various components or modules, but it should be clear to those skilled in the art that various related technologies such as bus connection can be used.
  • the foregoing components or modules may be implemented by hardware facilities such as processors and memories; the implementation of this application does not limit this.
  • the luma CU and the chroma CU are divided according to the size of the largest TU; the chroma CU can be divided into the same chroma as the largest TU size TU can not only improve compression efficiency, but also improve the coding performance of chrominance components.
  • An embodiment of the present application also provides a video codec device, where the video codec device performs image processing or video processing, including:
  • the encoder determines whether the size of the CU exceeds the size of the largest TU during the transformation and quantization process of image encoding; in the case that the size of the CU exceeds the size of the largest TU, the luminance component of the CU is encoded according to the size of the largest TU.
  • chrominance component coding unit and coding according to the divided luminance component coding unit and chrominance component coding unit;
  • the decoder determines whether the size of the CU exceeds the size of the largest TU during the inverse transformation and dequantization process of image decoding; in the case that the size of the CU exceeds the size of the largest TU, the luminance component of the CU is calculated according to the size of the largest TU.
  • the coding unit and the chrominance component coding unit are divided; and the decoding is performed according to the divided luminance component coding unit and the chrominance component coding unit.
  • Fig. 9 is a schematic diagram of an encoder/decoder according to an embodiment of the present application.
  • the encoder/decoder 900 may include: a processor 901 and a memory 902; the memory 902 is coupled to the processor 901.
  • the memory 902 can store various data; in addition, it also stores an information processing program 903, and the program 903 is executed under the control of the processor 901.
  • the functions of the image encoding device 700 may be integrated into the processor 901.
  • the processor 901 may be configured to implement the image encoding method described in the embodiment of the first aspect.
  • the processor 901 may be configured to perform the following control: in the process of image coding transformation and quantization, determine whether the size of the CU exceeds the size of the largest TU; in the case that the size of the CU exceeds the size of the largest TU, according to the maximum
  • the size of the TU divides the luminance component coding unit and the chrominance component coding unit of the CU respectively; and performs coding according to the divided luminance component coding unit and the chrominance component coding unit.
  • the functions of the image decoding device 800 may be integrated into the processor 901.
  • the processor 901 may be configured to implement the image decoding method described in the embodiment of the second aspect.
  • the processor 901 may be configured to perform the following control: in the inverse transform and dequantization process of image decoding, determine whether the size of the CU exceeds the size of the largest TU; in the case where the size of the CU exceeds the size of the largest TU, The luminance component coding unit and the chrominance component coding unit of the CU are respectively divided according to the size of the largest TU; and the decoding is performed according to the divided luminance component coding unit and the chrominance component coding unit.
  • the encoder/decoder 900 may further include: an input/output (I/O) device 904 and a display 905, etc.; wherein the functions of the above-mentioned components are similar to those of the prior art, and will not be repeated here. It is worth noting that the encoder/decoder 900 does not necessarily include all the components shown in FIG. 9; in addition, the encoder/decoder 900 may also include components not shown in FIG. 9, and you can refer to related technologies. .
  • An embodiment of the present application provides a computer-readable program, wherein when the program is executed in an electronic device, the program causes the electronic device to execute the image encoding method as described in the embodiment of the first aspect.
  • An embodiment of the present application provides a storage medium storing a computer-readable program, wherein the computer-readable program enables an electronic device to execute the image encoding method described in the embodiment of the first aspect.
  • An embodiment of the present application provides a computer-readable program, wherein when the program is executed in an electronic device, the program causes the electronic device to execute the image decoding method described in the embodiment of the second aspect.
  • An embodiment of the present application provides a storage medium storing a computer-readable program, wherein the computer-readable program enables an electronic device to execute the image decoding method described in the embodiment of the second aspect.
  • the above devices and methods of this application can be implemented by hardware, or by hardware combined with software.
  • This application relates to such a computer-readable program, when the program is executed by a logic component, the logic component can realize the above-mentioned device or constituent component, or the logic component can realize the above-mentioned various methods Or steps.
  • This application also relates to storage media for storing the above programs, such as hard disks, magnetic disks, optical disks, DVDs, flash memory, etc.
  • the method/device described in combination with the embodiments of the present application may be directly embodied as hardware, a software module executed by a processor, or a combination of the two.
  • one or more of the functional block diagrams and/or one or more combinations of the functional block diagrams shown in the figure may correspond to each software module of the computer program flow or each hardware module.
  • These software modules can respectively correspond to the steps shown in the figure.
  • These hardware modules can be implemented by solidifying these software modules using a field programmable gate array (FPGA), for example.
  • FPGA field programmable gate array
  • the software module can be located in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM or any other form of storage medium known in the art.
  • a storage medium may be coupled to the processor, so that the processor can read information from the storage medium and write information to the storage medium; or the storage medium may be an integral part of the processor.
  • the processor and the storage medium may be located in the ASIC.
  • the software module can be stored in the memory of the mobile terminal, or can be stored in a memory card that can be inserted into the mobile terminal.
  • the software module can be stored in the MEGA-SIM card or a large-capacity flash memory device.
  • One or more of the functional blocks described in the drawings and/or one or more combinations of the functional blocks can be implemented as general-purpose processors, digital signal processors (DSPs) for performing the functions described in this application. ), Application Specific Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component or any appropriate combination thereof.
  • DSPs digital signal processors
  • ASIC Application Specific Integrated Circuit
  • FPGA Field Programmable Gate Array
  • One or more of the functional blocks described in the drawings and/or one or more combinations of the functional blocks can also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, or multiple micro-processing Processor, one or more microprocessors in communication with the DSP, or any other such configuration.
  • An image coding method includes:
  • the luminance component coding unit and the chrominance component coding unit of the coding unit CU are divided according to the size of the maximum transformation unit TU. ;as well as
  • Encoding is performed according to the divided luminance component coding unit and chrominance component coding unit.
  • Supplement 2 The method according to Supplement 1, wherein the luminance component coding unit of the coding unit CU is divided into a plurality of luminance component transformation units, and the size of the luminance component transformation unit is equal to the maximum transformation unit TU Size, and
  • the size of the chroma component coding unit of the coding unit CU does not exceed the size of the maximum transformation unit TU
  • the size of the chroma component coding unit of the coding unit CU remains unchanged; in the coding unit CU
  • the chrominance component unit of the coding unit CU is divided into a plurality of luminance component transformation units. The size is equal to the size of the largest transformation unit TU.
  • Appendix 3 The method according to Appendix 1 or 2, wherein the method further includes:
  • Encoding indication information for indicating coding unit division the indication information indicating division according to the size of the maximum transformation unit TU when the size of the coding unit CU exceeds the size of the maximum transformation unit TU.
  • Supplement 4 The method according to any one of Supplements 1 to 3, wherein the image coding uses inter-frame prediction.
  • An image decoding method comprising:
  • the luminance component coding unit and the chrominance component coding unit of the coding unit CU are divided according to the size of the maximum transformation unit TU. ;as well as
  • Decoding is performed according to the divided luminance component coding unit and chrominance component coding unit.
  • Appendix 6 The method according to Appendix 5, wherein the luminance component coding unit of the coding unit CU is divided into a plurality of luminance component transformation units, and the size of the luminance component transformation unit is equal to the maximum transformation unit TU Size, and
  • the size of the chroma component coding unit of the coding unit CU does not exceed the size of the maximum transformation unit TU
  • the size of the chroma component coding unit of the coding unit CU remains unchanged; in the coding unit CU
  • the chrominance component unit of the coding unit CU is divided into a plurality of luminance component transformation units. The size is equal to the size of the largest transformation unit TU.
  • Appendix 7 The method according to Appendix 5 or 6, wherein the method further includes:
  • Decoding indication information for indicating coding unit division the indication information indicating division according to the size of the maximum transformation unit TU when the size of the coding unit CU exceeds the size of the maximum transformation unit TU.
  • Supplement 8 The method according to any one of Supplements 5 to 7, wherein the image decoding uses inter-frame prediction.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Discrete Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

Le mode de réalisation de la présente invention concerne un procédé et un dispositif de codage et de décodage d'image et un dispositif de codage et de décodage de vidéo. Le procédé consiste à : dans le processus de transformation et de quantification d'un codage d'image, déterminer si la taille d'une CU est supérieure à celle d'une TU maximale ; si tel est le cas, réaliser une division pour des CU de luminance et des CU de chrominance respectivement en fonction de la taille de la TU maximale.
PCT/CN2019/092005 2019-06-20 2019-06-20 Procédé et dispositif de codage et de décodage d'image et dispositif de codage et de décodage de vidéo WO2020252726A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104247424A (zh) * 2012-04-05 2014-12-24 高通股份有限公司 已译码的区块旗标译码
US20170310978A1 (en) * 2012-06-22 2017-10-26 Microsoft Technology Licensing, Llc Coded-Block-Flag Coding and Derivation
CN108713320A (zh) * 2016-03-16 2018-10-26 联发科技股份有限公司 视频编码中限制块尺寸的视频数据处理方法与装置
US20190124362A1 (en) * 2011-01-13 2019-04-25 Texas Instruments Incorporated Method and apparatus for a low complexity transform unit partitioning structure for hevc

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190124362A1 (en) * 2011-01-13 2019-04-25 Texas Instruments Incorporated Method and apparatus for a low complexity transform unit partitioning structure for hevc
CN104247424A (zh) * 2012-04-05 2014-12-24 高通股份有限公司 已译码的区块旗标译码
US20170310978A1 (en) * 2012-06-22 2017-10-26 Microsoft Technology Licensing, Llc Coded-Block-Flag Coding and Derivation
CN108713320A (zh) * 2016-03-16 2018-10-26 联发科技股份有限公司 视频编码中限制块尺寸的视频数据处理方法与装置

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