WO2020253823A1 - 一种编解码方法、装置及存储介质 - Google Patents

一种编解码方法、装置及存储介质 Download PDF

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WO2020253823A1
WO2020253823A1 PCT/CN2020/097088 CN2020097088W WO2020253823A1 WO 2020253823 A1 WO2020253823 A1 WO 2020253823A1 CN 2020097088 W CN2020097088 W CN 2020097088W WO 2020253823 A1 WO2020253823 A1 WO 2020253823A1
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jccr
processing unit
indication information
current processing
mode
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French (fr)
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徐丽英
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杭州海康威视数字技术股份有限公司
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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
    • H04N19/13—Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/186—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a colour or a chrominance component
    • 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
    • H04N19/10—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
    • H04N19/11—Selection of coding mode or of prediction mode among a plurality of spatial predictive coding modes
    • 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
    • H04N19/119—Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks
    • 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
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/146—Data rate or code amount at the encoder output
    • H04N19/147—Data rate or code amount at the encoder output according to rate distortion criteria
    • 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
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/157—Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
    • H04N19/159—Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
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    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
    • H—ELECTRICITY
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    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/18—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a set of transform coefficients
    • H—ELECTRICITY
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    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques
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    • H04N19/70—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by syntax aspects related to video coding, e.g. related to compression standards
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    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/90—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals
    • H04N19/91—Entropy coding, e.g. variable length coding [VLC] or arithmetic coding

Definitions

  • This application relates to the field of image processing technology, and in particular to an encoding and decoding method, device and storage medium.
  • syntax elements can be various indications, such as first ISP indication information or second ISP indication information.
  • the first ISP indication information is used to indicate whether to start the intra-frame sub-block prediction mode, and the second ISP indication information is used to indicate the frame.
  • the sub-block division method of intra-sub-block prediction mode is used to indicate the frame.
  • the embodiments of the present application provide an encoding and decoding method and a storage medium, which can be used to solve the problem of low flexibility of the encoding and decoding process in related technologies.
  • the technical solution is as follows:
  • a decoding method includes:
  • JCCR indication information Decoding JCCR indication information, where the JCCR indication information is used to indicate whether the current processing unit supports JCCR mode
  • the current block If it is determined according to the JCCR indication information that the current block supports the JCCR mode, and the current block activates the JCCR mode, the current block’s blue chrominance CB component and red chrominance CR component are correlated with each other. The block is decoded to obtain the chrominance residual coefficient of the current block.
  • the JCCR indication information exists in a sequence parameter set, an image parameter level, a slice level or a tile level.
  • a coding and decoding device which is characterized in that the device includes:
  • a memory for storing processor executable instructions
  • the processor is configured to execute any one of the foregoing encoding and decoding methods or decoding methods.
  • a computer-readable storage medium is provided, and instructions are stored on the computer-readable storage medium, and when the instructions are executed by a processor, any one of the foregoing encoding and decoding methods or decoding methods is implemented.
  • a computer program product containing instructions which when running on a computer, causes the computer to execute any of the above-mentioned encoding and decoding methods or decoding methods.
  • a JCCR indication information is added to the codec to indicate whether the current processing unit supports the JCCR mode.
  • decoding first decode the JCCR indication information, and then determine whether the current processing unit supports the JCCR mode according to the JCCR indication information.
  • a grammar is added to enable or disable the JCCR mode, which improves the flexibility of the encoding and decoding process.
  • FIG. 1 is a schematic structural diagram of an encoding and decoding system provided by an embodiment of the present application
  • FIG. 2 is a schematic diagram of a coding and decoding process provided by an embodiment of the present application
  • FIG. 3 is an exemplary direction corresponding to an intra prediction mode provided by an embodiment of the present application.
  • FIG. 4 is an exemplary direction corresponding to an angle mode provided by an embodiment of the present application.
  • FIG. 5 is a schematic diagram of image block division according to an embodiment of the present application.
  • FIG. 6 is a flowchart of an encoding mode provided by an embodiment of the present application.
  • FIG. 7 is a flowchart of an encoding mode provided by an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of an encoding terminal provided by an embodiment of the present application.
  • Fig. 9 is a schematic structural diagram of a decoding end provided by an embodiment of the present application.
  • FIG. 1 is a schematic structural diagram of an encoding and decoding system provided by an embodiment of the present application.
  • the codec system includes an encoder 01, a decoder 02, a storage device 03 and a link 04.
  • the encoder 01 can communicate with the storage device 03, and the encoder 01 can also communicate with the decoder 02 through the link 04.
  • the decoder 02 can also communicate with the storage device 03.
  • the encoder 01 is used to obtain a data source, encode the data source, and transmit the encoded code stream to the storage device 03 for storage, or directly transmit it to the decoder 02 via the link 04.
  • the decoder 02 can obtain the code stream from the storage device 03 and decode it to obtain the data source, or decode it after receiving the code stream transmitted by the encoder 01 via the link 04 to obtain the data source.
  • the data source can be a captured image or a captured video.
  • Both the encoder 01 and the decoder 02 can be used as an electronic device alone.
  • the storage device 03 may include any of a variety of distributed or locally accessible data storage media. For example, hard drives, Blu-ray discs, read-only discs, flash memory, or other suitable digital storage media for storing encoded data.
  • the link 04 may include at least one communication medium, and the at least one communication medium may include a wireless and/or wired communication medium, such as an RF (Radio Frequency) spectrum or one or more physical transmission lines.
  • RF Radio Fre
  • FIG. 2 is a schematic diagram of a coding and decoding process according to an exemplary embodiment.
  • the coding includes prediction, transformation, quantization, and entropy coding.
  • Decoding includes decoding, inverse transformation, inverse quantization, and prediction. A process.
  • binary arithmetic coding and decoding techniques are usually used to code and decode current syntax elements.
  • Prediction in encoding and decoding generally includes intra-frame prediction, multi-line prediction, cross-component prediction and matrix-based intra-frame prediction, etc.
  • intra-frame luminance candidate list and adaptive loop filtering will also be used in encoding and decoding Encoder, adaptive motion vector precision encoding and decoding technology, and BD (Block-based quantized residual domain Differential) PCM (Pulse Code Modulation) encoding and decoding technology, etc.
  • BD Block-based quantized residual domain Differential
  • PCM Pulse Code Modulation
  • Binary arithmetic coding refers to performing arithmetic coding on each bin (bit) after binarization of the current syntax element according to its probability model parameters to obtain the final code stream. It includes two coding methods: context-based adaptive arithmetic coding and bypass-based binary arithmetic coding.
  • CABAC Context-based Adaptive Binary Arithmetic Coding, context-based adaptive binary arithmetic coding
  • CABAC Context-based Adaptive Binary Arithmetic Coding, context-based adaptive binary arithmetic coding
  • the encoding of each symbol is related to the result of previous encoding, and the codeword is adaptively allocated to each symbol according to the statistical characteristics of the symbol stream, especially for symbols with non-equal probability of occurrence, which can be further compressed Bit rate.
  • Each bit of the syntax element enters the context modeler in order, and the encoder assigns an appropriate probability model to each input bit according to the previously encoded syntax element or bit. This process is called context modeling.
  • the bits and the probability model assigned to it are sent to the binary arithmetic encoder for encoding.
  • the encoder needs to update the context model according to the bit value, which is the adaptation of the encoding.
  • Bypass-based Binary Arithmetic Coding is a binary arithmetic coding mode based on equal probability (also called bypass coding mode). Compared with CABAC, Bypass has less probability update process. There is no need to adaptively update the probability state. Instead, a fixed probability of 50% of the probability of 0 and 1 is used for coding. This coding method is simpler, has low coding complexity and low memory consumption, and is suitable for symbols with equal probability.
  • Intra-frame prediction refers to using the correlation of the image space domain to predict the pixels of the current image block by using the pixels of the neighboring blocks that have been coded and reconstructed around the current image block, so as to achieve the purpose of removing the image space redundancy.
  • a variety of intra prediction modes are specified in intra prediction, and each intra prediction mode corresponds to a texture direction (except for the DC mode). For example, if the texture of the image is arranged horizontally, then selecting the horizontal prediction mode can better predict the image information.
  • the luminance component in HEVC High Efficiency Video Coding
  • HEVC High Efficiency Video Coding
  • each size of prediction unit corresponds to 35 intra prediction modes. Contains Planar mode, DC mode and 33 angle modes, as shown in Table 1.
  • Planar mode is suitable for areas where the pixel value changes slowly.
  • two linear filters in the horizontal and vertical directions can be used for filtering, and the average of the two is used as the predicted value of the current image block.
  • the DC mode is suitable for a large flat area, and the average pixel value of the neighboring blocks that have been coded and reconstructed around the current image block can be used as the predicted value of the current image block.
  • the Planar mode and the DC mode may also be called non-angle modes.
  • the intra prediction modes corresponding to the mode number 26 and the mode number 10 respectively indicate the vertical direction and the horizontal direction.
  • the mode number 26 may be adjacent
  • the intra prediction modes corresponding to the mode numbers of are collectively referred to as vertical prediction modes, and the intra prediction modes corresponding to the mode numbers adjacent to the mode number 10 are collectively referred to as horizontal prediction modes.
  • the vertical prediction modes may include The mode number 2 to the mode number 18, and the horizontal prediction mode may include the mode number 19 to the mode number 34.
  • VVC Very Video Coding, Valser Video Coding
  • the method used in conventional intra prediction is to use surrounding pixels to predict the current block, which removes spatial redundancy.
  • the target prediction mode used can be from the MPM (Most Probable Mode, most likely intra prediction mode) list, or it can be from the non-MPM list.
  • ISP Intra Sub-block-Partitions, intra sub-block prediction
  • the intra prediction method adopted in the ISP technology is to divide the image block into multiple sub-blocks for prediction.
  • the supported division methods include horizontal division and vertical division.
  • the decoder when the current block starts the ISP mode, if the size of the current block supports only one division method by default, the current block is divided according to the default division direction, and it is predicted, inversely transformed, and reversed.
  • processing such as quantization if the size of the current block supports two division methods, it is necessary to further analyze its division direction, and then divide the current block according to the determined division direction, and perform processing such as prediction, inverse transformation, and inverse quantization on it.
  • the method adopted in the MRL technology is to predict based on the reference pixels of the current block, and the reference pixels can come from adjacent rows of the current block.
  • the reference pixels may come from Reference line 0 (line 0), Reference line 1 (line 1), Reference line 2 (line 2) and Reference line 3 (line 3) as shown in FIG. 5.
  • the 0th line is the line adjacent to the current block boundary
  • the 1st line is the second adjacent line to the current block boundary
  • the 2nd line is the adjacent line of the first line
  • the third line is the second adjacent line Line.
  • reference pixels come from Reference line 0, Reference line 1 and Reference line 3, and Reference 2 is not used.
  • the line may be a line on the upper side of the current block, or a column on the left side of the current block.
  • the number of MPMs in HEVC is 3, and the number of MPMs in current VVC is 6.
  • the intra-frame prediction mode must come from MPM.
  • the intra-frame prediction mode may come from MPM or non-MPM.
  • CCLM Cross-component Linear Model Prediction, cross-component prediction
  • the method adopted in the CCLM technology is to use a linear prediction model to reconstruct the pixel value through the luminance component and use a linear equation to obtain the predicted pixel value of the chrominance component, which can remove the redundancy between the image components and further improve the coding performance.
  • MDLM-L is a cross-component prediction mode that uses only the left template information to obtain linear parameters
  • MDLM-T uses only the upper template information.
  • the cross-component prediction mode of linear model parameters is derived.
  • DM uses the same prediction mode as brightness for chrominance.
  • Adaptive loop filter can select a filter from a fixed filter according to its own gradient direction for filtering, and can indicate whether the block has ALF filtering enabled through the CTU-level flag. Degree and brightness can be controlled separately.
  • AMVR adaptive motion vector resolution, adaptive motion vector resolution
  • AMVR is used to indicate that different precisions can be used when performing motion vector difference coding.
  • the precision used can be integer pixel precision, such as 4 pixel precision, or non-integer pixel precision, such as 1/16 pixel precision.
  • This technology can be applied to motion vector data coding in conventional intra-frame prediction, and can also be used in motion vector data coding in affine prediction mode.
  • the matrix-based intra prediction technology refers to determining the predicted pixel value of the current block by taking the upper and left adjacent pixels of the current block as reference pixels, sending them to the matrix-vector multiplier and adding an offset value.
  • BDPCM refers to directly copying the pixel value of the corresponding reference pixel in the vertical direction when predicting the pixel in the prediction process, or copying the pixel value of the corresponding reference pixel in the horizontal direction, similar to vertical prediction and horizontal prediction. Then the residual values of the predicted pixels and the original pixels are quantized, and the quantized residuals are differentially coded.
  • r i,j ,0 ⁇ i ⁇ M-1,0 ⁇ j ⁇ N-1 represents the prediction residual
  • Q(ri ,j ) 0 ⁇ i ⁇ M-1,0 ⁇ j ⁇ N-1 indicates that the prediction residual r i,j is quantized to obtain the quantized residual. Then, perform differential coding on the quantized residual Q(ri ,j ) to obtain the differential coding result
  • the inverse accumulation process is used to obtain the quantized residual data.
  • the quantized residual is dequantized and added to the predicted value to obtain the reconstructed pixel value.
  • JCCR Joint Coding of Chrominance Residuals, joint coding of chrominance residuals
  • JCCR is a joint coding method of CB (blue chroma) and CR (red chroma) components. By observing the distribution of chroma residuals, it is not difficult to find that CB and CR always show a trend of negative correlation, so JCCR uses this phenomenon to propose a joint coding method for CB and CR. For example, only coding (CB-CR)/2 is required, which is the mean value of CB and CR components.
  • the decoding end needs to transmit different syntax elements to the encoding end, and more context models are required to transmit the syntax elements, the encoding and decoding process is complex, and the memory overhead is large.
  • the present application provides a coding and decoding method that can reduce the number of required context models, thereby reducing the complexity of the coding and decoding process and the memory overhead.
  • the encoding and decoding methods of the embodiments of the present application will be introduced respectively with respect to the foregoing prediction modes and encoding and decoding technologies.
  • FIG. 6 is a flowchart of an encoding mode provided by an embodiment of the present application. The method is applied to the encoding end. As shown in FIG. 6, the method includes the following steps:
  • Step 601 Before decoding the current block according to the JCCR mode, encode the JCCR indication information according to whether the current block supports the JCCR mode.
  • the JCCR indication information is used to indicate whether the current processing unit supports the JCCR mode.
  • the range of the unit in the current processing unit can be sequence level, image parameter level or block level.
  • the current processing unit is the current image block.
  • whether the current processing unit supports the JCCR mode refers to whether the JCCR mode is enabled, that is, whether the JCCR mode is enabled.
  • the JCCR indication information is sps_jccr_enable_flag, which is the enable flag of JCCR.
  • sps_jccr_enable_flag is true, it means that the current block supports JCCR mode.
  • the current block may be a chrominance residual block.
  • JCCR indication information may exist in SPS (Sequence Paramater Set, sequence parameter set), image parameter level, slice level, or tile level.
  • SPS Sequence Paramater Set, sequence parameter set
  • image parameter level image parameter level
  • slice level slice level
  • tile level image parameter level
  • JCCR indication information exists in the sequence parameter set, that is, the JCCR indication information is a syntax added at the SPS level.
  • the encoding end may also encode range indication information, where the range indication information is used to indicate the range of the processing unit supporting the JCCR mode.
  • the range indication information may exist in a sequence parameter set (SPS), an image parameter level, a slice level, or a tile level.
  • the encoder can determine whether the current block starts the JCCR mode according to the JCCR indication information.
  • the encoder can consider starting the JCCR mode. For example, whether the current block starts the JCCR mode can be determined by the encoder through RDO.
  • FIG. 7 is a flowchart of a decoding method provided by an embodiment of the present application. The method is applied to the decoding end. The method is a decoding method corresponding to the encoding method shown in FIG. 6 above. As shown in FIG. 7, the method includes The following steps:
  • Step 701 Before decoding the current block according to the JCCR mode, decode the JCCR indication information.
  • the JCCR indication information is used to indicate whether the current processing unit supports the JCCR mode.
  • Step 702 If it is determined that the current block supports the JCCR mode according to the JCCR indication information, and the current block starts the JCCR mode, the current block is decoded according to the correlation between the CB component and the CR component of the current block to obtain the chrominance residual coefficient of the current block .
  • the CBF value of the current block can be determined continuously. If the CBF values of the CBF and CR components of the CB component of the current block are both true, that is, both the CB component and the CR component of the current block have non-zero transform coefficients, continue to analyze whether the current block starts the JCCR mode. If it is determined that the JCCR mode is activated for the current block, the current block is decoded according to the correlation between the CB component and the CR component of the current block to obtain the chrominance residual coefficient of the current block.
  • the CBF value of the current block is used to indicate whether the transform block of the current block has non-zero transform coefficients, that is, whether the transform block of the current block contains one or more transform coefficients that are not equal to 0.
  • the CBF value of the current block may include the CBF value of the CB component of the current block and the CBF value of the CR component of the current block.
  • the CBF value of the CB component of the current block is used to indicate whether the CB transform block of the current block has non-zero transform coefficients, that is, whether the CB transform block of the current block contains one or more transform coefficients that are not equal to zero.
  • the CBF value of the CR component of the current block is used to indicate whether the CR transform block of the current block has non-zero transform coefficients, that is, whether the CR transform block of the current block contains one or more transform coefficients that are not equal to zero. If the CBF value of the CB component of the current block is true, that is, the CBF value of the CB component is 1, it means that the CB transform block of the current block has a non-zero transform coefficient. If the CBF value of the CR component of the current block is true, that is, the CBF value of the CR component is 1, it means that the CR transform block of the current block has a non-zero transform coefficient.
  • the JCCR indication information may exist in a sequence parameter set (SPS), an image parameter level, a slice level, or a tile level.
  • SPS sequence parameter set
  • the JCCR indication information exists in the sequence parameter set, that is, the JCCR indication information is a syntax added at the SPS level
  • the decoding end may also decode the range indication information, where the range indication information is used to indicate the size range of the processing unit supporting the JCCR mode.
  • the range indication information may exist in a sequence parameter set (SPS), an image parameter level, a slice level, or a tile level.
  • a grammar for indicating whether the JCCR mode is supported is added, which improves the flexibility of the coding and decoding process.
  • a syntax is added to indicate the range of processing units that support the JCCR mode.
  • the current block or image block described in the embodiment of the present application may also be another processing unit at the sequence level, the image parameter level, or the block level, which is not limited in the embodiment of the present application.
  • a decoding device which includes:
  • the first decoding module is used to decode JCCR indication information, where the JCCR indication information is used to indicate whether the current processing unit supports the JCCR mode;
  • the determining module is used to determine whether the current processing unit supports the JCCR mode according to the JCCR instruction information.
  • the determining module is used to:
  • the identification value of the JCCR indication information is the first value, it is determined that the current processing unit supports the JCCR mode;
  • the identification value of the JCCR indication information is the second value, it is determined that the current processing unit does not support the JCCR mode.
  • the JCCR indication information exists in the sequence parameter set.
  • the device further includes:
  • the second decoding module is configured to: if it is determined according to the JCCR instruction information that the current processing unit supports the JCCR mode, and the current processing unit starts the JCCR mode, then according to the current processing unit's blue chroma CB component and red chroma CR component The correlation decodes the current processing unit to obtain the chrominance residual coefficient of the current processing unit.
  • the second decoding module is used for:
  • the CBF value of the CB component and the CBF value of the CR component of the current processing unit are determined, and the CBF value is used to indicate whether the corresponding component has a non-zero transform coefficient;
  • the current processing unit activates the JCCR mode
  • the current processing unit is decoded according to the correlation between the CB component and the CR component of the current processing unit to obtain the chrominance residual coefficient of the current processing unit.
  • the device further includes:
  • the third decoding module is configured to decode range indication information, which is used to indicate the size range of the processing unit supporting the JCCR mode.
  • the range indication information exists in the sequence parameter set.
  • the current processing unit is the current image block.
  • an encoding device which includes:
  • the first encoding module is used to encode JCCR indication information, and the JCCR indication information is used to indicate whether the current processing unit supports the JCCR mode.
  • the JCCR indication information exists in the sequence parameter set.
  • the device further includes a first determining module for:
  • the device further includes:
  • the second determining module is used to optimize the RDO decision through rate distortion and determine whether to start the JCCR mode.
  • the device further includes:
  • the second encoding module is used to encode range indication information, where the range indication information is used to indicate the size range of the processing unit supporting the JCCR mode.
  • the range indication information exists in the sequence parameter set.
  • the current processing unit is the current image block.
  • an electronic device which includes:
  • a memory for storing processor executable instructions
  • the processor is configured to execute the following decoding method:
  • JCCR indication information which is used to indicate whether the current processing unit supports JCCR mode
  • an electronic device is also provided, and the electronic device includes:
  • a memory for storing processor executable instructions
  • the processor is configured to execute the following encoding method:
  • Encode the JCCR indication information which is used to indicate whether the current processing unit supports the JCCR mode.
  • a computer-readable storage medium stores an instruction, and the instruction is executed by a processor to implement the following decoding method:
  • JCCR indication information which is used to indicate whether the current processing unit supports JCCR mode
  • a computer-readable storage medium stores instructions, which is characterized in that, when the instructions are executed by a processor, the following encoding method is implemented:
  • Encode the JCCR indication information which is used to indicate whether the current processing unit supports the JCCR mode.
  • a computer program product containing instructions which when running on a computer, causes the computer to execute the following decoding method:
  • JCCR indication information which is used to indicate whether the current processing unit supports JCCR mode
  • the JCCR instruction information it is determined whether the current processing unit supports the JCCR mode.
  • a computer program product containing instructions which when running on a computer, causes the computer to execute the following coding method:
  • Encode the JCCR indication information which is used to indicate whether the current processing unit supports the JCCR mode.
  • FIG. 8 is a schematic structural diagram of an encoding terminal 800 provided by an embodiment of the present application.
  • the encoding terminal 800 may have relatively large differences due to different configurations or performance, and may include one or more processors (central processing units, CPU) 801 and one or more memories 802, where at least one instruction is stored in the memory 802, and the at least one instruction is loaded and executed by the processor 801 to implement the encoding methods provided by the foregoing method embodiments.
  • the encoding terminal 800 may also have components such as a wired or wireless network interface, a keyboard, and an input/output interface for input and output.
  • the encoding terminal 800 may also include other components for implementing device functions, which will not be repeated here.
  • FIG. 9 is a schematic structural diagram of a decoding terminal 900 provided by an embodiment of the present application.
  • the decoding terminal 900 may have relatively large differences due to different configurations or performance, and may include one or more processors (central processing units, CPU) 901 and one or more memories 902, where at least one instruction is stored in the memory 902, and the at least one instruction is loaded and executed by the processor 901 to implement the decoding methods provided by the foregoing method embodiments.
  • the decoding terminal 900 may also have components such as a wired or wireless network interface, a keyboard, and an input/output interface for input and output.
  • the encoding terminal 900 may also include other components for implementing device functions, which will not be described here.
  • a computer-readable storage medium is also provided, and instructions are stored on the computer-readable storage medium.
  • the instructions are executed by a processor, any one of the encoding methods, decoding methods, or encoding methods described above is implemented. Decoding method.
  • a computer program product containing instructions, which is characterized in that when it runs on a computer, it causes the computer to execute any of the encoding methods, decoding methods, or encoding and decoding methods described above.

Abstract

本申请公开了一种编解码方法、装置及存储介质，属于图像处理技术领域。所述方法包括：对JCCR指示信息进行解码，JCCR指示信息用于指示当前处理单元是否支持JCCR模式；根据JCCR指示信息，确定当前处理单元是否支持JCCR模式，如此，增加了一个语法来开启或者关闭JCCR模式，提高了编解码过程的灵活性。

Description

一种编解码方法、装置及存储介质
本申请要求于2019年06月21日提交的申请号为201910545251.0、发明名称为“一种编解码方法、装置及存储介质”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及图像处理技术领域，特别涉及一种编解码方法、装置及存储介质。
背景技术
目前，在图像编解码技术领域中，编码端对图像块进行编码时，通常需要利用上下文模型对一些语法元素进行编码，以将这些语法元素携带在图像块的编码流中发送给解码端。解码端接收到图像块的编码流后，需要按照与编码端相同的上下文模型对这些语法元素进行解析，以基于这些语法元素重构图像。这些语法元素可以为各种指示信息，比如可以为第一ISP指示信息或第二ISP指示信息，第一ISP指示信息用于指示是否启动帧内子块预测模式，第二ISP指示信息用于指示帧内子块预测模式的子块划分方式。
但是，不同的语法元素可能需要基于不同的上下文模型进行基于上下文的自适应二进制算术编解码，同一语法元素在不同情况下，可能也需要基于不同的上下文模型进行基于上下文的自适应二进制算术编解码，这样将导致编解码过程中需要用到较多的上下文模型，编解码过程复杂程度高，内存开销较大。
发明内容
本申请实施例提供了一种编解码方法及存储介质，可以用于解决相关技术中存在的编解码过程灵活性较低的问题。所述技术方案如下：
一方面，提供了一种解码方法，所述方法包括：
对JCCR指示信息进行解码，所述JCCR指示信息用于指示当前处理单元是否支持JCCR模式；
若根据所述JCCR指示信息确定所述当前块支持JCCR模式，且所述当前块启动JCCR模式，则按照所述当前块的蓝色色度CB分量和红色色度CR分量的相关性对所述当前块进行解码，得到所述当前块的色度残差系数。
在本申请一种可能的实现方式中，所述JCCR指示信息存在于序列参数集、图像参数级、slice级或Tile级中。
一方面，提供了一种编解码装置，其特征在于，所述装置包括：
处理器；
用于存储处理器可执行指令的存储器；
其中，所述处理器被配置为执行上述任一种编解码方法或解码方法。
一方面，提供了一种计算机可读存储介质，所述计算机可读存储介质上存储有指令，所述指令被处理器执行时实现上述任一种编解码方法或解码方法。
一方面，提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述任一种编解码方法或解码方法。
本申请实施例提供的技术方案带来的有益效果是：
本申请实施例中，在编解码中增加了一个JCCR指示信息，来指示当前处理单元是否支持JCCR模式。在解码时，先对JCCR指示信息进行解码，然后根据JCCR指示信息，确定当前处理单元是否支持JCCR模式。如此，增加了一个语法来开启或者关闭JCCR模式，提高了编解码过程的灵活性。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本申请实施例提供的一种编解码系统的结构示意图；
图2是本申请实施例提供的一种编解码的流程示意图；
图3是本申请实施例提供的一种帧内预测模式对应的方向示例性；
图4是本申请实施例提供的一种角度模式对应的方向示例性；
图5是本申请实施例提供的一种图像块的划分示意图；
图6是本申请实施例提供的一种编码模式的流程图；
图7是本申请实施例提供的一种编码模式的流程图；
图8是本申请实施例提供的一种编码端的结构示意图；
图9是本申请实施例提供的一种解码端的结构示意图。
具体实施方式
为使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请实施方式作进一步地详细描述。
在对本申请实施例进行详细地解释说明之前，先对本申请实施例的应用场景予以说明。
图1是本申请实施例提供的一种编解码系统的结构示意图。如图1所示，编解码系统包括编码器01、解码器02、存储装置03和链路04。编码器01与存储装置03可以进行通信，编码器01还可以通过链路04与解码器02进行通信。解码器02还可以与存储装置03进行通信。
编码器01用于获取数据源，对数据源进行编码，并将编码后的码流传输至存储装置03进行存储，或者直接通过链路04传输至解码器02。解码器02可以从存储装置03中获取码流，并进行解码得到数据源，或者在接收到编码器01通过链路04传输的码流后进行解码，得到数据源。其中，数据源可以为拍摄到的图像，也可以为拍摄到的视频。编码器01和解码器02均可以单独作为一个电子设备。存储装置03可包括多种分布式或本地存取式的数据存 储媒体中的任一者。例如，硬盘驱动器、蓝光光盘、只读光盘、快闪存储器，或用于存储经编码的数据的其它合适数字存储媒体。链路04可包括至少一个通信媒体，该至少一个通信媒体可以包括无线和/或有线通信媒体，例如RF(Radio Frequency，射频)频谱或一根或多根物理传输线。
请参考图2，图2是根据一示例性实施例示出的一种编解码的流程示意图，编码包括预测、变换、量化、熵编码几个过程，解码包括解码、反变换、反量化、预测几个过程。目前，通常采用二进制算术编解码技术来对当前语法元素进行编解码。编码和解码中的预测一般包括帧内预测、多行预测、跨分量预测和基于矩阵的帧内预测等，另外，编码和解码中还将用到帧内亮度候选者列表、自适应环路滤波器、自适应运动矢量精度编解码技术和BD(Block-based quantized residual domain Differential，基于块的量化后残差的差分)PCM(Pulse Code Modulation，脉冲编码调制)编解码技术等，接下来对这些预测方式和编解码技术进行简单介绍。
二进制算术编码
二进制算术编码是指对当前语法元素二进制化后的每一个bin(比特位)根据其概率模型参数进行算术编码，得到最后的码流。它包括两种编码方式：基于上下文的自适应算术编码和基于旁路的二进制算术编码。
CABAC(Context-based Adaptive Binary Arithmetic Coding，基于上下文的自适应二进制算术编码)是一种将自适应的二进制算术编码和一个设计精良的上下文模型结合起来得到的方法。在编码中，每一个符号的编码都与以前编码的结果有关，根据符号流的统计特性来自适应的为每个符号分配码字，尤其是适用于出现概率为非等概率的符号，能够进一步压缩码率。语法元素的各个比特位顺序的进入上下文模型器，编码器根据之前编码过的语法元素或者比特位，为每一个输入的比特位分配合适的概率模型，该过程称为上下文建模。将比特位和分配给它的概率模型一起送到二元算术编码器进行编码。编码器要根据比特位值更新上下文模型，这就是编码的自适应。
基于旁路的二进制算术编码(Bypass-based Binary Arithmetic Coding)是一种基于等概率的二进制算术编码模式(也称为旁路编码模式)，相比于CABAC，Bypass少了概率更新的过程，也无需对概率状态进行自适应更新，而是采用0和1概率各50％的固定概率进行编码，此编码方法更加简单，并且编码复杂度低，内存消耗小，适用于等概率的符号。
帧内预测
帧内预测是指利用图像空间域的相关性，使用当前图像块周围已编码重建的相邻块的像素，预测该当前图像块的像素，从而达到去除图像空域冗余的目的。帧内预测中规定了多种帧内预测模式，每一种帧内预测模式都对应一种纹理方向(DC模式除外)。譬如，如果图像的纹理是呈现水平状排布的，那么选择水平类预测模式可以更好的预测图像信息。示例性的，HEVC(High Efficiency Video Coding，高效视频编码)中亮度分量可以支持5种尺寸的预测单元(图像块或子块)，每一种尺寸的预测单元都对应35种帧内预测模式，包含Planar模式、DC模式和33种角度模式，如表1所示。
表1
模式号 帧内预测模式
0 Intra_Planar
1 Intra_DC
2...34 Intra_angular2…Intra_angular34
该多种帧内预测模式对应的预测方向如图3所示。Planar模式适用于像素值缓慢变化的区域，在实施中，可以使用水平方向和垂直方向的两个线性滤波器进行滤波处理，将两者的平均值作为当前图像块的预测值。DC模式适用于大面积平坦区域，可以将当前图像块周围已编码重建的相邻块的平均像素值作为当前图像块的预测值。作为一种示例，Planar模式和DC模式又可以称为非角度模式。请继续参考图3，在角度模式中，模式号26和模式号10对应帧内预测模式分别表示垂直方向和水平方向，在本申请一种可能的实现方式中，可以将与模式号26相邻的模式号对应的帧内预测模式统称为垂直类预测模式，以及将与模式号10相邻的模式号对应的帧内预测模式统称为水平类预测模式，示例性的，垂直类预测模式可以包括模式号2至模式号18，水平类预测模式可以包括模式号19至模式号34。另外，在新一代编解码标准VVC(Versatile Video Coding，瓦尔塞视频编码)中针对角度模式做了更细致的划分，如图4所示。
常规帧内预测
常规帧内预测所采用的方法是利用周围像素预测当前块，去除的是空域冗余性。常规帧内预测模式下，所采用的目标预测模式可以来自MPM(Most Probable Mode，最有可能的帧内预测模式)列表，也可以来自非MPM列表。
ISP(Intra Sub-block-Partitions，帧内子块预测)
ISP技术中帧内预测采用的方法是将图像块划分成多个子块进行预测，对于支持ISP技术的图像块来说能够支持的划分方式包括水平划分和垂直划分。对于解码端来说，在当前块启动ISP模式的情况下，如果当前块的尺寸默认仅支持一种划分方式，则按照默认划分方向对当前块进行划分，以及对其进行预测，反变换，反量化等处理，如果当前块的尺寸支持两种划分方式，则还需进一步解析其划分方向，再按照确定的划分方向对当前块进行划分，以及对其进行预测，反变换，反量化等处理。
MRL(Multi-Reference Line,多行预测)
MRL技术中采用的方法是基于当前块的参考像素进行预测，参考像素可以来自当前块的邻近行。譬如，参考像素可以来自如图5所示的Reference line0(第0行)，Reference line1(第1行)，Reference line2(第2行)和Reference line3(第3行)。其中，第0行是与当前块边界相邻的行，第1行是与当前块边界次相邻的行，第2行是第1行相邻的行，第3行是第2行相邻的行。目前在新一代编解码标准VVC中，参考像素来自Reference line0，Reference line1和Reference line3，Reference2没有被使用。其中，所述line可以是当前块上侧的行，也可以是当前块左侧的列。
MPM
在HEVC中MPM的个数是3个，在目前的VVC中MPM的个数是6个。对于ISP和MRL模式来说，其帧内预测模式一定是来自于MPM的，对于常规帧内预测来说，其帧内预 测模式可能来自MPM也可能来自非MPM。
CCLM(Cross-Component Linear Model Prediction，跨分量预测)
CCLM技术中采用的方法是使用一种线性预测模型通过亮度分量重构像素值利用线性方程来得到色度分量预测像素值的技术，能够去除图像分量之间的冗余，进一步提升编码性能。目前有三种跨分量预测模式，分别为MDLM_L模式、MDLM_T模式和DM模式，MDLM-L为仅用了左侧模板信息得到线性参数的跨分量预测模式，MDLM-T为仅用了上侧模板信息推导得到线性模型参数的跨分量预测模式，DM为色度采用与亮度一样的预测模式。
自适应环路滤波
自适应环路滤波器(Adaptive loop filter,ALF)，可以根据自身梯度方向，在固定的滤波器中选择一种滤波器进行滤波，并可以通过CTU级的flag表示该块是否开启ALF滤波，色度和亮度可以分开控制。
AMVR(adaptive motion vector resolution，自适应运动矢量精度)
AMVR用于表示在进行运动矢量差编码时可以采用不同的精度，所采用的的精度可以是整像素精度，如4像素精度，也可以是非整数像素精度，如1/16像素精度。该技术可以应用于常规帧内预测下的运动矢量数据编码，也可以用于affine(仿射)预测模式下的运动矢量数据编码。
MIP(Matrix Based Intra Prediction，基于矩阵的帧内预测)
基于矩阵的帧内预测技术是指通过将当前块上边和左边相邻像素作为参考像素，送入矩阵向量乘法器并加上一个偏置值来确定得到当前块的预测像素值。
BDPCM
BDPCM是指在预测环节预测像素时是直接垂直方向拷贝对应参考像素的像素值，或者水平方向拷贝对应参考像素的像素值，类似于垂直预测和水平预测。然后将预测像素和原始像素的残差值进行量化，并对量化后的残差进行差分编码。
举例说明，若当前块的尺寸为M*N，则r i,j,0≤i≤M-1,0≤j≤N-1表示预测残差，Q(r i,j),0≤i≤M-1,0≤j≤N-1表示对预测残差r i,j,进行量化得到量化后的残差。然后，对量化后的残差Q(r i,j)进行差分编码，得到差分编码结果
Figure PCTCN2020097088-appb-000001
当是垂直的RDPCM模式时，
Figure PCTCN2020097088-appb-000002
.当是水平RDPCM模式时，
Figure PCTCN2020097088-appb-000003
最终将
Figure PCTCN2020097088-appb-000004
编入码流。
对于解码端来说，逆向的累加过程用于得到量化后的残差数据。
对于垂直预测来说，
Figure PCTCN2020097088-appb-000005
对于水平预测来说，
Figure PCTCN2020097088-appb-000006
然后，将量化后的残差进行反量化，并与预测值进行相加得到重构像素值。
JCCR(Joint Coding of Chrominance Residuals，色度残差的联合编码)
JCCR是一种CB(蓝色色度)分量和CR(红色色度)分量联合编码的方式，通过观察色度残差的分布，不难发现，CB和CR总是呈现出负相关的趋势，因此JCCR利用这种现象，提出CB和CR联合编码的方式，例如只需要编码(CB-CR)/2，也就是CB和CR分量的均值。
相关技术中，在不同预测模式或编解码技术下，解码端需要向编码端传输不同的语法元素，而且传输语法元素所需的上下文模型较多，编解码过程复杂程度高，内存开销较大。基于此，本申请提供了一种能够减少所需上下文模型的数量，进而减小编解码过程复杂程度高和内存开销的编解码方法。接下来，将分别针对上述几种预测模式和编解码技术，对本申请实施例编解码方法进行介绍。
JCCR模式
图6是本申请实施例提供的一种编码模式的流程图，该方法应用于编码端，如图6所示，该方法包括如下步骤：
步骤601：在根据JCCR模式对当前块进行解码之前，根据当前块是否支持JCCR模式，对JCCR指示信息进行编码，JCCR指示信息用于指示当前处理单元是否支持JCCR模式。
其中，当前处理单元中的单元的范围可以是序列级，图像参数级或块级等。比如，当前处理单元为当前图像块。
其中，当前处理单元是否支持JCCR模式是指是否使能JCCR模式，也即是，是否开启JCCR模式。示例的，JCCR指示信息为sps_jccr_enable_flag，其为JCCR的使能标识位。作为一个示例，sps_jccr_enable_flag为真时，表示当前块支持JCCR模式。作为一个示例，当前块可以为色度残差块。
作为一个示例，JCCR指示信息可以存在于SPS(Sequence Paramater Set，序列参数集)、图像参数级、slice级或Tile级中。优选地，JCCR指示信息存在于序列参数集，也即是，JCCR指示信息是在SPS级增加的一个语法。
作为一个示例，编码端还可以编码范围指示信息，该范围指示信息用于指示支持JCCR模式的处理单元的范围。作为一个示例，该范围指示信息可以存在于序列参数集(SPS)、图像参数级、slice级或Tile级中。
之后，编码端可以根据JCCR指示信息，确定当前块是否启动JCCR模式。
作为一个示例，若JCCR模式指示当前块支持JCCR模式，可以继续确定当前块的CBF值，若当前块的CB分量和CR分量的CBF值均为真，即当前块的CB分量和CR分量的残差系数均不为0，则编码端可以考虑启动JCCR模式。示例的，当前块是否启动JCCR模式可以由编码端通过RDO决策得出的。
图7是本申请实施例提供的一种解码方法的流程图，该方法应用于解码端，该方法是与上述图6所示的编码方法对应的解码方法，如图7所示，该方法包括如下步骤：
步骤701：在根据JCCR模式对当前块进行解码之前，对JCCR指示信息进行解码，JCCR指示信息用于指示当前处理单元是否支持JCCR模式。
步骤702：若根据JCCR指示信息确定当前块支持JCCR模式，且当前块启动JCCR模式，则按照当前块的CB分量和CR分量的相关性对当前块进行解码，得到当前块的色度残差系数。
作为一个示例，若根据JCCR指示信息确定当前块支持JCCR模式，则可以继续确定当前块的CBF值。若当前块的CB分量的CBF和CR分量的CBF值均为真，即当前块的CB分量和CR分量均具有非零变换系数，则继续解析当前块是否启动JCCR模式。若确定当前块启动JCCR模式，则按照当前块的CB分量和CR分量的相关性对当前块进行解码，得到当前块的色度残差系数。
其中，当前块的CBF值用于指示当前块的变换块是否具有非零变换系数，即当前块的变换块是否包含一个或多个不等于0的变换系数。当前块的CBF值可以包括当前块的CB分量的CBF值和当前块的CR分量的CBF值。其中，当前块的CB分量的CBF值用于指示当前块的CB变换块是否具有非零变换系数，即当前块的CB变换块是否包含一个或多个不等于0的变换系数。当前块的CR分量的CBF值用于指示当前块的CR变换块是否具有非零变换系数，即当前块的CR变换块是否包含一个或多个不等于0的变换系数。若当前块的CB分量的CBF值为真，即CB分量的CBF值为1，则表示当前块的CB变换块具有非零变换系数。若当前块的CR分量的CBF值为真，即CR分量的CBF值为1，则表示当前块的CR变换块具有非零变换系数。
作为一个示例，JCCR指示信息可以存在于序列参数集(SPS)、图像参数级、slice级或Tile级中。优选地，JCCR指示信息存在于序列参数集，也即是，JCCR指示信息是在SPS级增加的一个语法
在另一实施例中，解码端还可以对范围指示信息进行解码，该范围指示信息用于指示支持JCCR模式的处理单元的尺寸范围。该范围指示信息可以为可以存在于序列参数集(SPS)、图像参数级、slice级或Tile级中。
本申请实施例中，增加了一个用于指示是否支持JCCR模式的语法，提高了编解码过程的灵活性。另外，还增加了一个语法用于指示支持JCCR模式的处理单元的范围。
需要说明的是，本申请实施例所述的当前块或图像块还可以为序列级、图像参数级或块级的其他处理单元，本申请实施例对此不作限定。
在一个实施例中，还提供了一种解码装置，该装置包括：
第一解码模块，用于对JCCR指示信息进行解码，该JCCR指示信息用于指示当前处理单元是否支持JCCR模式；
确定模块，用于根据该JCCR指示信息，确定当前处理单元是否支持JCCR模式。
可选地，该确定模块用于：
当该JCCR指示信息的标识值为第一取值时，确定该当前处理单元支持JCCR模式；
当该JCCR指示信息的标识值为第二取值时，确定该当前处理单元不支持JCCR模式。
可选地，该JCCR指示信息存在于序列参数集中。
可选地，该装置还包括：
第二解码模块，用于若根据该JCCR指示信息确定该当前处理单元支持JCCR模式，且 该当前处理单元启动JCCR模式，则按照该当前处理单元的蓝色色度CB分量和红色色度CR分量的相关性对该当前处理单元进行解码，得到该当前处理单元的色度残差系数。
可选地，该第二解码模块用于：
若根据该JCCR指示信息确定该当前处理单元支持JCCR模式，则确定该当前处理单元的CB分量的CBF值和CR分量的CBF值，该CBF值用于指示对应分量是否具有非零变换系数；
若该当前处理单元的CB分量的CBF值和CR分量的CBF值均为真，则解析该当前处理单元是否启动JCCR模式，该CBF值为真用于指示对应分量具有非零变换系数；
若该当前处理单元启动JCCR模式，则按照该当前处理单元的CB分量和CR分量的相关性对该当前处理单元进行解码，得到该当前处理单元的色度残差系数。
可选地，该装置还包括：
第三解码模块，用于对范围指示信息进行解码，该范围指示信息用于指示支持JCCR模式的处理单元的尺寸范围。
可选地，该范围指示信息存在于序列参数集中。
可选地，该当前处理单元为当前图像块。
在一个实施例中，还提供了一种编码装置，该装置包括：
第一编码模块，用于对JCCR指示信息进行编码，该JCCR指示信息用于指示当前处理单元是否支持JCCR模式。
可选地，该JCCR指示信息存在于序列参数集中。
可选地，若该当前处理单元支持JCCR模式，则在确定启动JCCR模式之前，该装置还包括第一确定模块，用于：
确定该当前处理单元的CB分量的CBF值和CR分量的CBF值，该CBF值用于指示对应分量是否具有非零变换系数；
若当前处理单元的CB分量的CBF值和CR分量的CBF值均为真，则确定满足启动JCCR模式的条件，该CBF值为真用于指示对应分量具有非零变换系数。
可选地，在确定满足启动JCCR模式的条件之后，该装置还包括：
第二确定模块，用于通过率失真优化RDO决策，确定是否启动JCCR模式。
可选地，该装置还包括：
第二编码模块，用于对范围指示信息进行编码，该范围指示信息用于指示支持JCCR模式的处理单元的尺寸范围。
可选地，该范围指示信息存在于序列参数集中。
可选地，该当前处理单元为当前图像块。
在一个实施例中，还提供了一种电子设备，，该电子设备包括：
处理器；
用于存储处理器可执行指令的存储器；
其中，该处理器被配置为执行下述解码方法：
对JCCR指示信息进行解码，该JCCR指示信息用于指示当前处理单元是否支持JCCR模式；
用于根据该JCCR指示信息，确定当前处理单元是否支持JCCR模式。
在另一个实施例中，还提供了一种电子设备，该电子设备包括：
处理器；
用于存储处理器可执行指令的存储器；
其中，该处理器被配置为执行下述编码方法：
对JCCR指示信息进行编码，该JCCR指示信息用于指示当前处理单元是否支持JCCR模式。
在一个实施例中，还提供了一种计算机可读存储介质，该计算机可读存储介质上存储有指令，该指令被处理器执行时实现下述解码方法：
对JCCR指示信息进行解码，该JCCR指示信息用于指示当前处理单元是否支持JCCR模式；
用于根据该JCCR指示信息，确定当前处理单元是否支持JCCR模式。
在另一个实施例中，还提供了一种计算机可读存储介质，该计算机可读存储介质上存储有指令，其特征在于，该指令被处理器执行时实现下述编码方法：
对JCCR指示信息进行编码，该JCCR指示信息用于指示当前处理单元是否支持JCCR模式。
在一个实施例中，还提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行下述解码方法：
对JCCR指示信息进行解码，该JCCR指示信息用于指示当前处理单元是否支持JCCR模式；
根据该JCCR指示信息，确定该当前处理单元是否支持JCCR模式。
在另一个实施例中，还提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行下述编码方法：
对JCCR指示信息进行编码，该JCCR指示信息用于指示当前处理单元是否支持JCCR模式。
图8是本申请实施例提供的一种编码端800的结构示意图，该编码端800可因配置或性能不同而产生比较大的差异，可以包括一个或一个以上处理器(central processing units，CPU)801和一个或一个以上的存储器802，其中，所述存储器802中存储有至少一条指令，所述至少一条指令由所述处理器801加载并执行以实现上述各个方法实施例提供的编码方法。当然，该编码端800还可以具有有线或无线网络接口、键盘以及输入输出接口等部件，以便进行输入输出，该编码端800还可以包括其他用于实现设备功能的部件，在此不做赘述。
图9是本申请实施例提供的一种解码端900的结构示意图，该解码端900可因配置或性 能不同而产生比较大的差异，可以包括一个或一个以上处理器(central processing units，CPU)901和一个或一个以上的存储器902，其中，所述存储器902中存储有至少一条指令，所述至少一条指令由所述处理器901加载并执行以实现上述各个方法实施例提供的解码方法。当然，该解码端900还可以具有有线或无线网络接口、键盘以及输入输出接口等部件，以便进行输入输出，该编码端900还可以包括其他用于实现设备功能的部件，在此不做赘述。
在另一实施例中，还提供了一种计算机可读存储介质，所述计算机可读存储介质上存储有指令，所述指令被处理器执行时实现上述任一种编码方法、解码方法或编解码方法。
在另一实施例中，还提供了一种包含指令的计算机程序产品，其特征在于，当其在计算机上运行时，使得计算机执行上述任一种编码方法、解码方法或编解码方法。
本领域普通技术人员可以理解实现上述实施例的全部或部分步骤可以通过硬件来完成，也可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可读存储介质中，上述提到的存储介质可以是只读存储器，磁盘或光盘等。
以上所述仅为本申请的较佳实施例，并不用以限制本申请，凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (23)

  1. 一种解码方法，其特征在于，所述方法包括：
    对JCCR指示信息进行解码，所述JCCR指示信息用于指示当前处理单元是否支持JCCR模式；
    根据所述JCCR指示信息，确定所述当前处理单元是否支持JCCR模式。
  2. 如权利要求1所述的方法，其特征在于，所述根据所述JCCR指示信息，确定所述当前处理单元是否支持JCCR模式，包括：
    当所述JCCR指示信息的标识值为第一取值时，确定所述当前处理单元支持JCCR模式；
    当所述JCCR指示信息的标识值为第二取值时，确定所述当前处理单元不支持JCCR模式。
  3. 如权利要求1所述的方法，其特征在于，所述JCCR指示信息存在于序列参数集中。
  4. 如权利要求1所述的方法，其特征在于，所述方法还包括：
    若根据所述JCCR指示信息确定所述当前处理单元支持JCCR模式，且所述当前处理单元启动JCCR模式，则按照所述当前处理单元的蓝色色度CB分量和红色色度CR分量的相关性对所述当前处理单元进行解码，得到所述当前处理单元的色度残差系数。
  5. 如权利要求1所述的方法，其特征在于，所述若根据所述JCCR指示信息确定所述当前处理单元支持JCCR模式，且所述当前处理单元启动JCCR模式，则按照所述当前处理单元的CB分量和CR分量的相关性对所述当前处理单元进行解码，得到所述当前处理单元的色度残差系数，包括：
    若根据所述JCCR指示信息确定所述当前处理单元支持JCCR模式，则确定所述当前处理单元的CB分量的CBF值和CR分量的CBF值，所述CBF值用于指示对应分量是否具有非零变换系数；
    若所述当前处理单元的CB分量的CBF值和CR分量的CBF值均为真，则解析所述当前处理单元是否启动JCCR模式，所述CBF值为真用于指示对应分量具有非零变换系数；
    若所述当前处理单元启动JCCR模式，则按照所述当前处理单元的CB分量和CR分量的相关性对所述当前处理单元进行解码，得到所述当前处理单元的色度残差系数。
  6. 如权利要求1所述的方法，其特征在于，所述按照所述当前处理单元的CB分量和CR分量的相关性对所述当前处理单元进行解码，得到所述当前处理单元的色度残差系数之前，还包括：
    对范围指示信息进行解码，所述范围指示信息用于指示支持JCCR模式的处理单元的尺寸范围。
  7. 如权利要求6所述的方法，其特征在于，所述范围指示信息存在于序列参数集中。
  8. 如权利要求1-7任一所述的方法，其特征在于，所述当前处理单元为当前图像块。
  9. 一种编码方法，其特征在于，所述方法包括：
    对JCCR指示信息进行编码，所述JCCR指示信息用于指示当前处理单元是否支持JCCR 模式。
  10. 如权利要求9所述的方法，其特征在于，所述JCCR指示信息存在于序列参数集中。
  11. 如权利要求9所述的方法，其特征在于，若所述当前处理单元支持JCCR模式，则在确定启动JCCR模式之前，所述方法还包括：
    确定所述当前处理单元的CB分量的CBF值和CR分量的CBF值，所述CBF值用于指示对应分量是否具有非零变换系数；
    若当前处理单元的CB分量的CBF值和CR分量的CBF值均为真，则确定满足启动JCCR模式的条件，所述CBF值为真用于指示对应分量具有非零变换系数。
  12. 如权利要求11所述的方法，其特征在于，在确定满足启动JCCR模式的条件之后，所述方法还包括：
    通过率失真优化RDO决策，确定是否启动JCCR模式。
  13. 如权利要求9所述的方法，其特征在于，所述方法还包括：
    对范围指示信息进行编码，所述范围指示信息用于指示支持JCCR模式的处理单元的尺寸范围。
  14. 如权利要求13所述的方法，其特征在于，所述范围指示信息存在于序列参数集中。
  15. 如权利要求9-14任一所述的方法，其特征在于，所述当前处理单元为当前图像块。
  16. 一种解码装置，其特征在于，所述装置包括：
    第一解码模块，用于对JCCR指示信息进行解码，所述JCCR指示信息用于指示当前处理单元是否支持JCCR模式；
    确定模块，用于根据所述JCCR指示信息，确定当前处理单元是否支持JCCR模式。
  17. 一种编码装置，其特征在于，所述装置包括：
    第一编码模块，用于对JCCR指示信息进行编码，所述JCCR指示信息用于指示当前处理单元是否支持JCCR模式。
  18. 一种电子设备，其特征在于，所述电子设备包括：
    处理器；
    用于存储处理器可执行指令的存储器；
    其中，所述处理器被配置为执行下述解码方法：
    对JCCR指示信息进行解码，所述JCCR指示信息用于指示当前处理单元是否支持JCCR模式；
    用于根据所述JCCR指示信息，确定当前处理单元是否支持JCCR模式。
  19. 一种电子设备，其特征在于，所述电子设备包括：
    处理器；
    用于存储处理器可执行指令的存储器；
    其中，所述处理器被配置为执行下述编码方法：
    对JCCR指示信息进行编码，所述JCCR指示信息用于指示当前处理单元是否支持JCCR模式。
  20. 一种计算机可读存储介质，所述计算机可读存储介质上存储有指令，其特征在于，所述指令被处理器执行时实现下述解码方法：
    对JCCR指示信息进行解码，所述JCCR指示信息用于指示当前处理单元是否支持JCCR模式；
    用于根据所述JCCR指示信息，确定当前处理单元是否支持JCCR模式。
  21. 一种计算机可读存储介质，所述计算机可读存储介质上存储有指令，其特征在于，所述指令被处理器执行时实现下述编码方法：
    对JCCR指示信息进行编码，所述JCCR指示信息用于指示当前处理单元是否支持JCCR模式。
  22. 一种包含指令的计算机程序产品，其特征在于，当其在计算机上运行时，使得计算机执行下述解码方法：
    对JCCR指示信息进行解码，所述JCCR指示信息用于指示当前处理单元是否支持JCCR模式；
    根据所述JCCR指示信息，确定所述当前处理单元是否支持JCCR模式。
  23. 一种包含指令的计算机程序产品，其特征在于，当其在计算机上运行时，使得计算机执行下述编码方法：
    对JCCR指示信息进行编码，所述JCCR指示信息用于指示当前处理单元是否支持JCCR模式。
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