WO2021236400A1 - Signalisation d'éléments de syntaxe dans un codage vidéo - Google Patents

Signalisation d'éléments de syntaxe dans un codage vidéo Download PDF

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Publication number
WO2021236400A1
WO2021236400A1 PCT/US2021/032110 US2021032110W WO2021236400A1 WO 2021236400 A1 WO2021236400 A1 WO 2021236400A1 US 2021032110 W US2021032110 W US 2021032110W WO 2021236400 A1 WO2021236400 A1 WO 2021236400A1
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sps
picture
luma
splitting
intra
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PCT/US2021/032110
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English (en)
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Yi-Wen Chen
Xiaoyu XIU
Tsung-Chuan MA
Hong-Jheng Jhu
Wei Chen
Xianglin Wang
Bing Yu
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Beijing Dajia Internet Information Technology Co., Ltd.
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Priority to CN202180036503.2A priority Critical patent/CN115668941A/zh
Publication of WO2021236400A1 publication Critical patent/WO2021236400A1/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
    • H04N19/134—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
    • 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
    • H04N19/169—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
    • H04N19/174—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 slice, e.g. a line of blocks or a group of 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
    • H04N19/169—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
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/70—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

Definitions

  • the present disclosure relates to video coding and compression, and in particular but not limited to, methods and apparatuses for signaling of syntax elements in video coding.
  • Video coding is performed according to one or more video coding standards.
  • video coding standards include versatile video coding (VVC), joint exploration test model (JEM), high- efficiency video coding (H.265/HEVC), advanced video coding (H.264/AVC), moving picture experts group (MPEG) coding, or the like.
  • Video coding generally utilizes prediction methods (e.g., inter-prediction, intra-prediction, or the like) that take advantage of redundancy present in video images or sequences.
  • An important goal of video coding techniques is to compress video data into a form that uses a lower bit rate, while avoiding or minimizing degradations to video quality.
  • the present disclosure provides examples of techniques relating to signaling of syntax elements in video coding.
  • a method for video coding includes that a decoder receives an adaptation parameter set (APS) associated with a picture. A syntax element for overriding partitioning constraints is signaled in the APS. Further, the method includes that the decoder obtains override information associated with the syntax element from the APS.
  • APS adaptation parameter set
  • a method for video coding includes that a decoder receives a picture header (PH) associated with a picture. A first flag and a second flag are signaled in the PH, where the first flag is configured for enabling or disabling overriding partitioning constraints for intra slices associated with the picture, and where the second flag is configured for enabling or disabling overriding the partitioning constraints for inter slices associated with the picture. Further, the method includes that the decoder obtains override information associated with the first flag and the second flag from the PH associated with the picture.
  • a method for video coding includes that a decoder predicts a value of a partitioning constraint according to a value of the partitioning constraint signaled in sequence parameter sets (SPS) associated with a picture.
  • SPS sequence parameter sets
  • a method for video coding includes deriving a value of a partition constraint associated with a picture according to a partitioning used in a previously encoded picture and disabling overriding the partition constraint in response to determining the value is the same as a value signaled in SPS associated with the picture.
  • an apparatus for video coding includes one or more processors and a memory configured to store instructions executable by the one or more processors.
  • the one or more processors upon execution of the instructions, are configured to perform any method according to the first aspect, the second aspect, the third aspect, and the fourth aspect of the present disclosure.
  • a non- transitory computer-readable storage medium for video coding storing computer-executable instructions that, when executed by one or more computer processors, causing the one or more computer processors to perform any method according to the first aspect, the second aspect, and the third aspect, and the fourth aspect of the present disclosure.
  • FIG. 1 is a block diagram illustrating an exemplary video encoder in accordance with some implementations of the present disclosure.
  • FIG. 2 is a block diagram illustrating an exemplary video decoder in accordance with some implementations of the present disclosure.
  • FIG. 3 illustrates an example of a picture divided into multiple coding tree units (CTUs) in accordance with some implementations of the present disclosure.
  • FIGS. 4A-4D are schematic diagrams illustrating multi-type tree splitting modes in accordance with some implementations of the present disclosure.
  • FIG. 5 is a block diagram illustrating an exemplary apparatus for video coding in accordance with some implementations of the present disclosure.
  • FIG. 6 is a flowchart illustrating an exemplary process of video coding in accordance with some implementations of the present disclosure.
  • FIG. 7 is a flowchart illustrating an exemplary process of video coding in accordance with some implementations of the present disclosure.
  • FIG. 8 is a flowchart illustrating an exemplary process of video coding in accordance with some implementations of the present disclosure.
  • FIG. 9 is a flowchart illustrating an exemplary process of video coding in accordance with some implementations of the present disclosure.
  • first,” “second,” “third,” and etc. are all used as nomenclature only for references to relevant elements, e.g., devices, components, compositions, steps, and etc., without implying any spatial or chronological orders, unless expressly specified otherwise.
  • a “first device” and a “second device” may refer to two separately formed devices, or two parts, components or operational states of a same device, and may be named arbitrarily.
  • module may include memory (shared, dedicated, or group) that stores code or instructions that can be executed by one or more processors.
  • a module may include one or more circuits with or without stored code or instructions.
  • the module or circuit may include one or more components that are directly or indirectly connected. These components may or may not be physically attached to, or located adjacent to, one another.
  • a method may comprise steps of: i) when or if condition X is present, function or action X’ is performed, and ii) when or if condition Y is present, function or action Y’ is performed.
  • the method may be implemented with both the capability of performing function or action X’, and the capability of performing function or action Y’.
  • the functions X’ and Y’ may both be performed, at different times, on multiple executions of the method.
  • a unit or module may be implemented purely by software, purely by hardware, or by a combination of hardware and software.
  • the unit or module may include functionally related code blocks or software components, that are directly or indirectly linked together, so as to perform a particular function.
  • FIG. 1 shows a block diagram of illustrating an exemplary block-based hybrid video encoder 100 which may be used in conjunction with many video coding standards using block-based processing.
  • a video frame is partitioned into a plurality of video blocks for processing.
  • a prediction is formed based on either an inter prediction approach or an intra prediction approach.
  • inter prediction one or more predictors are formed through motion estimation and motion compensation, based on pixels from previously reconstructed frames.
  • intra prediction predictors are formed based on reconstructed pixels in a current frame. Through mode decision, a best predictor may be chosen to predict a current block.
  • a prediction residual representing the difference between a current video block and its predictor, is sent to a Transform circuitry 102.
  • Transform coefficients are then sent from the Transform circuitry 102 to a Quantization circuitry 104 for entropy reduction.
  • Quantized coefficients are then fed to an Entropy Coding circuitry 106 to generate a compressed video bitstream.
  • prediction-related information 110 from an inter prediction circuitry and/or an Intra Prediction circuitry 112 such as video block partition info, motion vectors, reference picture index, and intra prediction mode, are also fed through the Entropy Coding circuitry 106 and saved into a compressed video bitstream 114.
  • decoder-related circuitries are also needed in order to reconstruct pixels for the purpose of prediction.
  • a prediction residual is reconstructed through an Inverse Quantization 116 and an Inverse Transform circuitry 118.
  • This reconstructed prediction residual is combined with a Block Predictor 120 to generate un-filtered reconstructed pixels for a current video block.
  • Intra prediction uses pixels from the samples of already coded neighboring blocks (which are called reference samples) in the same video picture and/or slice to predict the current video block. Spatial prediction reduces spatial redundancy inherent in the video signal.
  • Inter prediction uses reconstructed pixels from already-coded video pictures to predict the current video block.
  • Temporal prediction reduces temporal redundancy inherent in the video signal.
  • Temporal prediction signal for a given coding unit (CU) or coding block is usually signaled by one or more motion vectors (MVs) which indicate the amount and the direction of motion between the current CU and its temporal reference. Further, if multiple reference pictures are supported, one reference picture index is additionally sent, which is used to identify from which reference picture in the reference picture store the temporal prediction signal comes.
  • MVs motion vectors
  • an intra/inter mode decision circuitry 121 in the encoder 100 chooses the best prediction mode, for example based on the rate-distortion optimization method.
  • the block predictor 120 is then subtracted from the current video block; and the resulting prediction residual is de-correlated using the transform circuitry 102 and the quantization circuitry 104.
  • the resulting quantized residual coefficients are inverse quantized by the inverse quantization circuitry 116 and inverse transformed by the inverse transform circuitry 118 to form the reconstructed residual, which is then added back to the prediction block to form the reconstructed signal of the CU.
  • in-loop filtering 115 such as a deblocking filter, a sample adaptive offset (SAO), and/or an adaptive in-loop filter (ALF) may be applied on the reconstructed CU before it is put in the reference picture store of the picture buffer 117 and used to code future video blocks.
  • coding mode inter or intra
  • prediction mode information prediction mode information
  • motion information motion information
  • quantized residual coefficients are all sent to the entropy coding unit 106 to be further compressed and packed to form the bit-stream.
  • a deblocking filter is available in AVC, HEVC as well as the now- current version of VVC.
  • SAO sample adaptive offset
  • ALF adaptive loop filter
  • These in-loop filter operations are optional. Performing these operations helps to improve coding efficiency and visual quality. They may also be turned off as a decision rendered by the encoder 100 to save computational complexity.
  • intra prediction is usually based on unfiltered reconstructed pixels, while inter prediction is based on filtered reconstructed pixels if these filter options are turned on by the encoder 100.
  • FIG. 2 is a block diagram illustrating an exemplary block-based video decoder 200 which may be used in conjunction with many video coding standards.
  • This decoder 200 is similar to the reconstruction-related section residing in the encoder 100 of FIG. 1.
  • an incoming video bitstream 201 is first decoded through an Entropy Decoding 202 to derive quantized coefficient levels and prediction-related information.
  • the quantized coefficient levels are then processed through an Inverse Quantization 204 and an Inverse Transform 206 to obtain a reconstructed prediction residual.
  • a block predictor mechanism implemented in an Intra/inter Mode Selector 212, is configured to perform either an Intra Prediction 208, or a Motion Compensation 210, based on decoded prediction information.
  • a set of unfiltered reconstructed pixels are obtained by summing up the reconstructed prediction residual from the Inverse Transform 206 and a predictive output generated by the block predictor mechanism, using a summer 214.
  • the reconstructed block may further go through an In-Loop Filter 209 before it is stored in a Picture Buffer 213 which functions as a reference picture store.
  • the reconstructed video in the Picture Buffer 213 may be sent to drive a display device, as well as used to predict future video blocks.
  • a filtering operation is performed on these reconstructed pixels to derive a final reconstructed Video Output 222.
  • VVC Versatile Video Coding
  • VTM1 VVC Test Model 1
  • a picture of an input video is partitioned into blocks called CTUs.
  • a CTU is split into CUs using a quadtree with a nested multi-type tree structure, with a CU defining a region of pixels sharing the same prediction mode (e.g., intra or inter).
  • the term ‘unit’ may define a region of an image covering all components such as luma and chroma.
  • the term ‘block’ may be used to define a region covering a particular component (e.g., luma), and the blocks of different components (e.g., luma vs. chroma) may differ in spatial location when considering the chroma sampling format such as 4:2:0.
  • FIG. 3 illustrates an example of a picture 300 divided into multiple CTUs 302 in accordance with some implementations of the present disclosure.
  • VVC picture are divided into a sequence of CTUs.
  • the CTU concept is same to that of the HEVC.
  • a CTU consists of an N*N block of luma samples together with two corresponding blocks of chroma samples.
  • the maximum allowed size of the luma block in a CTU is specified to be 128x128 (although the maximum size of the luma transform blocks is 64x64).
  • a CTU is split into CUs by using a quaternary -tree structure denoted as coding tree to adapt to various local characteristics.
  • the decision whether to code a picture area using inter-picture (temporal) or intra-picture (spatial) prediction is made at the leaf CU level.
  • Each leaf CU can be further split into one, two or four PUs according to the PU splitting type. Inside one PU, the same prediction process is applied and the relevant information is transmitted to the decoder on a PU basis.
  • a leaf CU After obtaining the residual block by applying the prediction process based on the PU splitting type, a leaf CU can be partitioned into transform units (TUs) according to another quaternary -tree structure similar to the coding tree for the CU.
  • transform units TUs
  • One of key feature of the HEVC structure is that it has the multiple partition conceptions including CU, PU, and TU.
  • a quadtree with nested multi -type tree using binary and ternary splits segmentation structure replaces the concepts of multiple partition unit types, i.e. it removes the separation of the CU, PU and TU concepts except as needed for CUs that have a size too large for the maximum transform length, and supports more flexibility for CU partition shapes.
  • a CU can have either a square or rectangular shape.
  • a CTU is first partitioned by a quaternary tree (a.k.a. quadtree) structure. Then the quaternary tree leaf nodes can be further partitioned by a multi-type tree structure.
  • FIGS. 4A-4D are schematic diagrams illustrating multi-type tree splitting modes in accordance with some implementations of the present disclosure. As shown in FIGS. 4A-4D, there are four splitting types in multi-type tree structure, vertical binary splitting 402 (SPLIT BT VER), horizontal binary splitting 404 (SPLIT BT HOR), vertical ternary splitting 406 (SPLIT TT VER), and horizontal ternary splitting 408 (SPLIT TT HOR).
  • the multi-type tree leaf nodes are called CUs, and unless the CU is too large for the maximum transform length, this segmentation is used for prediction and transform processing without any further partitioning.
  • the CU, PU, and TU have the same block size in the quadtree with nested multi-type tree coding block structure.
  • the exception occurs when maximum supported transform length is smaller than the width or height of the colour component of the CU.
  • the first layer of bitstream of syntax signaling is the Network Abstraction Layer (NAL) where the bitstream is divided into a set of NAL units.
  • NAL units signal common control parameters to the decoder, such as the SPS and Picture Parameter Sets (PPS). Others contain video data.
  • the Video Coding Layer (VCL) NAL units contain slices of coded video. A coded picture is called an access unit and can be encoded as one or more slices.
  • a coded video sequence starts with an Instantaneous Decoder Refresh (IDR) picture. All following video pictures are coded as slices. A new IDR picture signals that the previous video segment is ended, and a new one begins. Each NAL unit begins with a one-byte header followed by the Raw Byte Sequence Payload (RBSP).
  • the RBSP contains encoded slices. Slices are binary coded, so they may be padded with zero bits to ensure that the length is an integer number of bytes.
  • a slice consists of a slice header and slice data. Slice data are specified as a series of CUs.
  • the picture header concept was adopted in the 16th JVET meeting to be transmitted once per picture as the first VCL NAL unit of a picture. It was also proposed to group some syntax elements previously in the slice header to this picture header. Syntax elements that functionally only need to be transmitted once per picture could be moved to the picture header instead of being transmitted multiple times in slices for a given picture.
  • syntax tables specify a superset of the syntax of all allowed bitstreams. Additional constraints on the syntax may be specified, either directly or indirectly, in other clauses.
  • Table 1 and Table 2 below are syntax tables of the slice header and PH in VVC. The semantics of some syntax are also illustrated after the syntax tables.
  • sps_qtbtt_dual_tree_intra_flag 1 specifies that, for I slices, each CTU is split into coding units with 64x64 luma samples using an implicit quadtree split, and these coding units are the root of two separate coding tree syntax structure for luma and chroma s p s_q t b t t_d ual t re e_i n t r a_n ag equal to 0 specifies separate coding xee syntax structure is not used for I slices. When sps_qtbtt_dual_tree_intra_flag is not present, it is inferred to be equal to 0.
  • sps_log2_min_luma_coding_block_size_minus2 plus 2 specifies the minimum luma coding block size.
  • the value range of sps_log2_min_luma_coding_block_size_minus2 shall be in the range of 0 to Min( 4, sps_log2_ctu_size_minus5 + 3 ), inclusive.
  • MinCbLog2SizeY, MinCbSizeY, IbcBufWidthY, IbcBufWidthC and Vsize are derived as follows:
  • MinCbLog2SizeY sps_log2_min_luma_coding_block_size_minus2 + 2 (49)
  • MinCbSizeY 1 « MinCbLog2SizeY (50)
  • IbcBufWidthY 256 * 128 / CtbSizeY (51)
  • IbcBufWidthC IbcBufWidthY / SubWidthC (52)
  • MinCbSizeY shall less than or equal to VSize.
  • CtbWidthC and CtbHeightC which specify the width and height, respectively, of the array for each chroma CTB, are derived as follows:
  • sps chroma format idc is equal to 0 (monochrome) or sps_separate_colour_plane_flag is equal to 1, CtbWidthC and CtbHeightC are both equal to 0.
  • CtbWidthC and CtbHeightC are derived as follows:
  • HorTravScanOrderf log2BlockWidth [ log2BlockHeight ] and VerTravScanOrderf log2BlockWidth ][ log2BlockHeight ].
  • sps partition constraints override enabled flag 1 specifies the presence of ph_partition_constraints_override_flag in PHs referring to the SPS.
  • sps_partition_constraints_override_enabled_flag 0 specifies the absence of ph_partition_constraints_override_flag in PHs referring to the SPS.
  • sps_log2_difF_min_qt_min_cb_intra_slice_luma specifies the default difference between the base 2 logarithm of the minimum size in luma samples of a luma leaf block resulting from quadtree splitting of a CTU and the base 2 logarithm of the minimum coding block size in luma samples for luma CUs in slices with sh slice type equal to 2 (I) referring to the SPS.
  • sps_partition_constraints_override_enabled_flag When sps_partition_constraints_override_enabled_flag is equal to 1, the default difference can be overridden by ph_log2_diff_min_qt_min_cb_luma present in PHs referring to the SPS.
  • the value of sps_log2_diff_min_qt_min_cb_intra_slice_luma shall be in the range of 0 to Min( 6, CtbLog2SizeY ) - MinCbLog2SizeY, inclusive.
  • the base 2 logarithm of the minimum size in luma samples of a luma leaf block resulting from quadtree splitting of a CTU is derived as follows:
  • MinQtLog2SizeIntraY sps_log2_diff_min_qt_min_cb_intra_slice_luma + MinCbLog2SizeY (56)
  • sps_max_mtt_hierarchy_depth_intra_slice_luma specifies the default maximum hierarchy depth for coding units resulting from multi-type tree splitting of a quadtree leaf in slices with sh_slice_type equal to 2 (I) referring to the SPS.
  • sh_slice_type 2 (I) referring to the SPS.
  • sps_partition_constraints_override_enabled_flag is equal to 1
  • the default maximum hierarchy depth can be overridden by ph_max_mtt_hierarchy_depth_intra_slice_luma present in PHs referring to the SPS.
  • the value of sps_max_mtt_hierarchy_depth_intra_slice_luma shall be in the range of 0 to 2*( CtbLog2SizeY - MinCbLog2SizeY ), inclusive.
  • sps_log2_difF_max_bt_min_qt_intra_slice_luma specifies the default difference between the base 2 logarithm of the maximum size (width or height) in luma samples of a luma coding block that can be split using a binary split and the minimum size (width or height) in luma samples of a luma leaf block resulting from quadtree splitting of a CTU in slices with sh_slice_type equal to 2 (I) referring to the SPS.
  • sps_partition_constraints_override_enabled_flag When sps_partition_constraints_override_enabled_flag is equal to 1, the default difference can be overridden by ph_log2_diff_max_bt_min_qt_luma present in PHs referring to the SPS.
  • the value of sps_log2_diff_max_bt_min_qt_intra_slice_luma shall be in the range of 0 to ( sps_qtbtt_dual_tree_intra_flag ? Min( 6, CtbLog2SizeY ) : CtbLog2SizeY ) - MinQtLog2S izelntraY, inclusive.
  • sps_log2_diff_max_bt_min_qt_intra_slice_luma When sps_log2_diff_max_bt_min_qt_intra_slice_luma is not present, the value of sps_log2_diff_max_bt_min_qt_intra_slice_luma is inferred to be equal to 0.
  • sps_log2_difF_max_tt_min_qt_intra_slice_luma specifies the default difference between the base 2 logarithm of the maximum size (width or height) in luma samples of a luma coding block that can be split using a ternary split and the minimum size (width or height) in luma samples of a luma leaf block resulting from quadtree splitting of a CTU in slices with sh_slice_type equal to 2 (I) referring to the SPS.
  • sps_partition_constraints_override_enabled_flag When sps_partition_constraints_override_enabled_flag is equal to 1, the default difference can be overridden by ph_log2_diff_max_tt_min_qt_luma present in PHs referring to the SPS.
  • the value of sps_log2_diff_max_tt_min_qt_intra_slice_luma shall be in the range of 0 to Min( 6, CtbLog2SizeY ) - MinQtLog2SizeIntraY, inclusive.
  • sps_log2_difF_min_qt_min_cb_inter_slice specifies the default difference between the base 2 logarithm of the minimum size in luma samples of a luma leaf block resulting from quadtree splitting of a CTU and the base 2 logarithm of the minimum luma coding block size in luma samples for luma CUs in slices with sh slice type equal to 0 (B) or 1 (P) referring to the SPS.
  • sps_partition_constraints_override_enabled_flag When sps_partition_constraints_override_enabled_flag is equal to 1, the default difference can be overridden by ph_log2_diff_min_qt_min_cb_luma present in PHs referring to the SPS.
  • the value of sps_log2_diff_min_qt_min_cb_inter_slice shall be in the range of 0 to Min( 6, CtbLog2SizeY ) - MinCbLog2SizeY, inclusive.
  • the base 2 logarithm of the minimum size in luma samples of a luma leaf block resulting from quadtree splitting of a CTU is derived as follows:
  • MinQtLog2SizeInterY sps_log2_diff_min_qt_min_cb_inter_slice + MinCbLog2SizeY (57)
  • sps_max_mtt_hierarchy_depth_inter_slice specifies the default maximum hierarchy depth for coding units resulting from multi-type tree splitting of a quadtree leaf in slices with sh slice type equal to 0 (B) or 1 (P) referring to the SPS.
  • sh slice type 0 (B) or 1 (P) referring to the SPS.
  • sps_partition_constraints_override_enabled_flag is equal to 1
  • the default maximum hierarchy depth can be overridden by ph max mtt hierarchy depth inter slice present in PHs referring to the SPS.
  • the value of sps max mtt hierarchy depth inter slice shall be in the range of 0 to 2*( CtbLog2SizeY - MinCbLog2SizeY ), inclusive.
  • sps_log2_difF_max_bt_min_qt_inter_slice specifies the default difference between the base 2 logarithm of the maximum size (width or height) in luma samples of a luma coding block that can be split using a binary split and the minimum size (width or height) in luma samples of a luma leaf block resulting from quadtree splitting of a CTU in slices with sh slice type equal to 0 (B) or 1 (P) referring to the SPS.
  • sps_partition_constraints_override_enabled_flag When sps_partition_constraints_override_enabled_flag is equal to 1, the default difference can be overridden by ph_log2_diff_max_bt_min_qt_luma present in PHs referring to the SPS.
  • the value of sps_log2_diff_max_bt_min_qt_inter_slice shall be in the range of 0 to CtbLog2SizeY - MinQtLog2SizeInterY, inclusive.
  • sps_log2_difF_max_tt_min_qt_inter_slice specifies the default difference between the base 2 logarithm of the maximum size (width or height) in luma samples of a luma coding block that can be split using a ternary split and the minimum size (width or height) in luma samples of a luma leaf block resulting from quadtree splitting of a CTU in slices with sh slice type equal to 0 (B) or 1 (P) referring to the SPS.
  • sps_partition_constraints_override_enabled_flag When sps_partition_constraints_override_enabled_flag is equal to 1, the default difference can be overridden by ph_log2_diff_max_tt_min_qt_luma present in PHs referring to the SPS.
  • the value of sps_log2_diff_max_tt_min_qt_inter_slice shall be in the range of 0 to Min( 6, CtbLog2SizeY ) - MinQtLog2SizeInterY, inclusive.
  • sps_log2_difF_min_qt_min_cb_intra_slice_chroma specifies the default difference between the base 2 logarithm of the minimum size in luma samples of a chroma leaf block resulting from quadtree splitting of a chroma CTU with treeType equal to DUAL TREE CHROMA and the base 2 logarithm of the minimum coding block size in luma samples for chroma CUs with treeType equal to DUAL TREE CHROMA in slices with sh slice type equal to 2 (I) referring to the SPS.
  • sps_log2_diff_min_qt_min_cb_intra_slice_chroma shall be in the range of 0 to Min( 6, CtbLog2SizeY ) - MinCbLog2SizeY, inclusive.
  • the value of sps_log2_diff_min_qt_min_cb_intra_slice_chroma is inferred to be equal to 0.
  • the base 2 logarithm of the minimum size in luma samples of a chroma leaf block resulting from quadtree splitting of a CTU with treeType equal to DUAL TREE CHROMA is derived as follows:
  • MinQtLog2SizeIntraC sps_l°g2_diff_min_qt_min_cb_intra_slice_chroma + MinCbLog2SizeY (58)
  • sps_max_mtt_hierarchy_depth_intra_slice_chroma specifies the default maximum hierarchy depth for chroma coding units resulting from multi-type tree splitting of a chroma quadtree leaf with treeType equal to DUAL TREE CHROMA in slices with sh slice type equal to 2 (I) referring to the SPS.
  • sps_partition_constraints_override_enabled_flag is equal to 1
  • the default maximum hierarchy depth can be overridden by ph max mtt hierarchy depth chroma present in PHs referring to the SPS.
  • sps_max_mtt_hierarchy_depth_intra_slice_chroma shall be in the range of 0 to 2*( CtbLog2SizeY - MinCbLog2SizeY ), inclusive.
  • the value of sps_max_mtt_hierarchy_depth_intra_slice_chroma is inferred to be equal to 0.
  • sps_log2_difF_max_bt_min_qt_intra_slice_chroma specifies the default difference between the base 2 logarithm of the maximum size (width or height) in luma samples of a chroma coding block that can be split using a binary split and the minimum size (width or height) in luma samples of a chroma leaf block resulting from quadtree splitting of a chroma CTU with treeType equal to DUAL TREE CHROMA in slices with sh slice type equal to 2 (I) referring to the SPS.
  • sps_partition_constraints_override_enabled_flag When sps_partition_constraints_override_enabled_flag is equal to 1, the default difference can be overridden by ph_log2_diff_max_bt_min_qt_chroma present in PHs referring to the SPS.
  • the value of sps_log2_diff_max_bt_min_qt_intra_slice_chroma shall be in the range of 0 to Min( 6, CtbLog2SizeY ) - MinQtLog2SizeIntraC, inclusive.
  • sps_log2_diff_max_bt_min_qt_intra_slice_chroma When sps_log2_diff_max_bt_min_qt_intra_slice_chroma is not present, the value of sps_log2_diff_max_bt_min_qt_intra_slice_chroma is inferred to be equal to 0.
  • sps_log2_difF_max_tt_min_qt_intra_slice_chroma specifies the default difference between the base 2 logarithm of the maximum size (width or height) in luma samples of a chroma coding block that can be split using a ternary split and the minimum size (width or height) in luma samples of a chroma leaf block resulting from quadtree splitting of a chroma CTU with treeType equal to DUAL TREE CHROMA in slices with sh slice type equal to 2 (I) referring to the SPS.
  • sps_partition_constraints_override_enabled_flag When sps_partition_constraints_override_enabled_flag is equal to 1, the default difference can be overridden by ph_log2_diff_max_tt_min_qt_chroma present in PHs referring to the SPS.
  • the value of sps_log2_diff_max_tt_min_qt_intra_slice_chroma shall be in the range of 0 to Min( 6, CtbLog2SizeY ) - MinQtLog2SizeIntraC, inclusive.
  • sps_log2_diff_max_tt_min_qt_intra_slice_chroma When sps_log2_diff_max_tt_min_qt_intra_slice_chroma is not present, the value of sps_log2_diff_max_tt_min_qt_intra_slice_chroma is inferred to be equal to 0.
  • ph_partition_constraints_override_flag 1 specifies that partition constraint parameters are present in the PH.
  • ph_partition_constraints_override_flag 0 specifies that partition constraint parameters are not present in the PH.
  • the value of ph_partition_constraints_override_flag is inferred to be equal to 0.
  • ph_log2_diff_min_qt_min_cb_intra_slice_luma specifies the difference between the base 2 logarithm of the minimum size in luma samples of a luma leaf block resulting from quadtree splitting of a CTU and the base 2 logarithm of the minimum coding block size in luma samples for luma CUs in the slices with sh_slice_type equal to 2 (I) associated with the PH.
  • the value of ph_log2_diff_min_qt_min_cb_intra_slice_luma shall be in the range of 0 to Min( 6, CtbLog2SizeY ) - MinCbLog2SizeY, inclusive.
  • ph_log2_diff_min_qt_min_cb_luma When not present, the value of ph_log2_diff_min_qt_min_cb_luma is inferred to be equal to sps_log2_diff_min_qt_min_cb_intra_slice_luma.
  • ph_max_mtt_hierarchy_depth_intra_slice_luma specifies the maximum hierarchy depth for coding units resulting from multi-type tree splitting of a quadtree leaf in slices with sh slice type equal to 2 (I) associated with the PH.
  • ph_max_mtt_hierarchy_depth_intra_slice_luma shall be in the range of 0 to 2*( CtbLog2SizeY - MinCbLog2SizeY ), inclusive.
  • the value of ph_max_mtt_hierarchy_depth_intra_slice_luma is inferred to be equal to sps_max_mtt_hierarchy_depth_intra_slice_luma.
  • ph_log2_diff_max_bt_min_qt_intra_slice_luma specifies the difference between the base 2 logarithm of the maximum size (width or height) in luma samples of a luma coding block that can be split using a binary split and the minimum size (width or height) in luma samples of a luma leaf block resulting from quadtree splitting of a CTU in slices with sh slice type equal to 2 (I) associated with the PH.
  • ph_log2_diff_max_bt_min_qt_intra_slice_luma shall be in the range of 0 to ( sps_qtbtt_dual_tree_intra_flag ? Min( 6, CtbLog2SizeY ) : CtbLog2SizeY ) - MinQtLog2SizeIntraY, inclusive.
  • the value of ph_log2_diff_max_bt_min_qt_intra_slice_luma is inferred to be equal to sps_log2_diff_max_bt_min_qt_intra_slice_luma.
  • ph_log2_diff_max_tt_min_qt_intra_slice_luma specifies the difference between the base 2 logarithm of the maximum size (width or height) in luma samples of a luma coding block that can be split using a ternary split and the minimum size (width or height) in luma samples of a luma leaf block resulting from quadtree splitting of a CTU in slices with sh slice type equal to 2 (I) associated with the PH.
  • ph_log2_diff_max_tt_min_qt_intra_slice_luma shall be in the range of 0 to Min( 6, CtbLog2SizeY ) - MinQtLog2SizeIntraY, inclusive.
  • the value of ph_log2_diff_max_tt_min_qt_intra_slice_luma is inferred to be equal to sps_log2_diff_max_tt_min_qt_intra_slice_luma.
  • ph_log2_diff_min_qt_min_cb_intra_slice_chroma specifies the difference between the base 2 logarithm of the minimum size in luma samples of a chroma leaf block resulting from quadtree splitting of a chroma CTU with treeType equal to DUAL TREE CHROMA and the base 2 logarithm of the minimum coding block size in luma samples for chroma CUs with treeType equal to DUAL TREE CHROMA in slices with sh slice type equal to 2 (I) associated with the PH.
  • ph_log2_diff_min_qt_min_cb_intra_slice_chroma shall be in the range of 0 to Min( 6, CtbLog2SizeY ) - MinCbLog2SizeY, inclusive.
  • the value of ph_log2_diff_min_qt_min_cb_intra_slice_chroma is inferred to be equal to sps_log2_diff_min_qt_min_cb_intra_slice_chroma.
  • ph_max_mtt_hierarchy_depth_intra_slice_chroma specifies the maximum hierarchy depth for chroma coding units resulting from multi-type tree splitting of a chroma quadtree leaf with treeType equal to DUAL TREE CHROMA in slices with sh slice type equal to 2 (I) associated with the PH.
  • the value of ph_max_mtt_hierarchy_depth_intra_slice_chroma shall be in the range of 0 to 2*( CtbLog2SizeY - MinCbLog2SizeY ), inclusive.
  • ph_max_mtt_hierarchy_depth_intra_slice_chroma is inferred to be equal to sps_max_mtt_hierarchy_depth_intra_slice_chroma.
  • ph_log2_diff_max_bt_min_qt_intra_slice_chroma specifies the difference between the base 2 logarithm of the maximum size (width or height) in luma samples of a chroma coding block that can be split using a binary split and the minimum size (width or height) in luma samples of a chroma leaf block resulting from quadtree splitting of a chroma CTU with treeType equal to DUAL TREE CHROMA in slices with sh slice type equal to 2 (I) associated with the PH.
  • ph_log2_diff_max_bt_min_qt_intra_slice_chroma shall be in the range of 0 to Min( 6, CtbLog2SizeY ) - MinQtLog2SizeIntraC, inclusive.
  • the value of ph_log2_diff_max_bt_min_qt_intra_slice_chroma is inferred to be equal to sps_log2_diff_max_bt_min_qt_intra_slice_chroma.
  • ph_log2_diff_max_tt_min_qt_intra_slice_chroma specifies the difference between the base 2 logarithm of the maximum size (width or height) in luma samples of a chroma coding block that can be split using a ternary split and the minimum size (width or height) in luma samples of a chroma leaf block resulting from quadtree splitting of a chroma CTU with treeType equal to DUAL TREE CHROMA in slices with sh slice type equal to 2 (I) associated with the PH.
  • ph_log2_diff_max_tt_min_qt_intra_slice_chroma shall be in the range of 0 to Min( 6, CtbLog2SizeY ) - MinQtLog2SizeIntraC, inclusive.
  • the value of ph_log2_diff_max_tt_min_qt_intra_slice_chroma is inferred to be equal to sps_log2_diff_max_tt_min_qt_intra_slice_chroma.
  • ph_log2_diff_min_qt_min_cb_inter_slice specifies the difference between the base 2 logarithm of the minimum size in luma samples of a luma leaf block resulting from quadtree splitting of a CTU and the base 2 logarithm of the minimum luma coding block size in luma samples for luma CUs in the slices with sh slice type equal to 0 (B) or 1 (P) associated with the PH.
  • the value of ph_log2_diff_min_qt_min_cb_inter_slice shall be in the range of 0 to Min( 6, CtbLog2SizeY ) - MinCbLog2SizeY, inclusive.
  • ph_log2_diff_min_qt_min_cb_luma When not present, the value of ph_log2_diff_min_qt_min_cb_luma is inferred to be equal to sps_log2_diff_min_qt_min_cb_inter_sbce.
  • ph_max_mtt_hierarchy_depth_inter_slice specifies the maximum hierarchy depth for coding units resulting from multi-type tree splitting of a quadtree leaf in slices with sh slice type equal to 0 (B) or 1 (P) associated with the PH.
  • the value of ph_max_mtt_hierarchy_depth_inter_slice shall be in the range of 0 to 2*( CtbLog2SizeY - MinCbLog2SizeY ), inclusive.
  • the value of ph_max_mtt_hierarchy_depth_inter_slice is inferred to be equal to sps max mtt hierarchy depth inter slice.
  • ph_log2_diff_max_bt_min_qt_inter_slice specifies the difference between the base 2 logarithm of the maximum size (width or height) in luma samples of a luma coding block that can be split using a binary split and the minimum size (width or height) in luma samples of a luma leaf block resulting from quadtree splitting of a CTU in the slices with sh slice type equal to 0 (B) or 1 (P) associated with the PH.
  • ph_log2_diff_max_bt_min_qt_inter_slice shall be in the range of 0 to CtbLog2SizeY - MinQtLog2SizeInterY, inclusive.
  • the value of ph_log2_diff_max_bt_min_qt_inter_slice is inferred to be equal to sps_log2_diff_max_bt_min_qt_inter_slice.
  • ph_log2_diff_max_tt_min_qt_inter_slice specifies the difference between the base 2 logarithm of the maximum size (width or height) in luma samples of a luma coding block that can be split using a ternary split and the minimum size (width or height) in luma samples of a luma leaf block resulting from quadtree splitting of a CTU in slices with sh slice type equal to 0 (B) or 1 (P) associated with the PH.
  • ph_log2_diff_max_tt_min_qt_inter_slice shall be in the range of 0 to Min( 6, CtbLog2SizeY ) - MinQtLog2SizeInterY, inclusive.
  • the value of ph_log2_diff_max_tt_min_qt_inter_slice is inferred to be equal to sps_log2_diff_max_tt_min_qt_inter_slice.
  • MinQtLog2SizeY, MinQtLog2SizeC, MinQtSizeY, MinQtSizeC, MaxBtSizeY, MaxBtSizeC, MinBtSizeY, MaxTtSizeY, MaxTtSizeC, MinTtSizeY, MaxMttDepthY and MaxMttDepthC are derived as follows.
  • MinQtLog2SizeY represents the base 2 logarithm of the minimum size in luma samples of a luma leaf block resulting from quadtree splitting of a CTU
  • MinQtSizeY represents the minimum size in luma samples of a luma leaf block resulting from quadtree splitting of a CTU and so on.
  • MinQtLog2SizeY MinCbLog2SizeY + ph_log2_diff_min_qt_min_cb_intra_slice_luma (119)
  • MinQtLog2SizeC MinCbLog2SizeY + ph_log2_diff_min_qt_min_cb_intra_slice_chroma (120)
  • MaxBtSizeY 1 « ( MinQtLog2SizeY + ph_log2_diff_max_bt_min_qt_intra_slice_luma )
  • MaxBtSizeC 1 « ( MinQtLog2SizeC + ph_log2_diff_max_bt_min_qt_intra_slice_chroma )
  • MaxMttDepthY ph_max_mtt_hierarchy_depth_intra_slice_luma (125)
  • MaxMttDepthC ph_max_mtt_hierarchy_depth_intra_slice_chroma (126)
  • CuChromaQpOffsetSubdiv ph_cu_chroma_qp_offset_subdiv_intra_slice (128)
  • MinQtLog2SizeY MinCbLog2SizeY + ph_log2_diff_min_qt_min_cb_inter_slice (129)
  • MinQtLog2SizeC MinCbLog2SizeY + ph_log2_diff_min_qt_min_cb_inter_slice (130)
  • MaxBtSizeY 1 « ( MinQtLog2SizeY + ph_log2_diff_max_bt_min_qt_inter_slice) (131)
  • MaxBtSizeC 1 « ( MinQtLog2SizeC + ph_log2_diff_max_bt_min_qt_inter_slice) (132)
  • MaxTtSizeY 1 « ( MinQtLog2SizeY + ph_log2_diff_max_tt_min_qt_inter_slice) (133)
  • MaxTtSizeC 1 « ( MinQtLog2SizeC + ph_log2_diff_max_tt_min_qt_inter_slice) (134)
  • MaxMttDepthY ph max mtt hierarchy depth inter slice (13 )
  • MaxMttDepthC ph_max_mtt_hierarchy_depth_inter_slice (136)
  • CuChromaQpOffsetSubdiv ph_cu_chroma_qp_offset_subdiv_inter_slice (138)
  • MinQtSizeY 1 « MinQtLog2SizeY (139)
  • MinQtSizeC 1 « MinQtLog2SizeC (140)
  • MinBtSizeY 1 « MinCbLog2SizeY (141)
  • MinTtSizeY 1 « MinCbLog2SizeY (142)
  • the syntax elements related to the partitioning constraints are signalled in SPS and the constraints can be overridden by the syntax elements in PH.
  • four syntax elements are signaled in the PH to override the signalled values of the corresponding syntax elements in SPS.
  • the four syntax elements include ph_log2_diff_min_qt_min_cb_inter_slice, ph_max_mtt_hierarchy_depth_inter_slice, ph_log2_diff_max_bt_min_qt_inter_slice, and ph_log2_diff_max_tt_min_qt_inter_slice.
  • the syntax element ph_log2_diff_min_qt_min_cb_inter_slice is used to signal the difference between the base 2 logarithm of the minimum size in luma samples of a luma leaf block resulting from quadtree splitting of a CTU and the base 2 logarithm of the minimum luma coding block size in luma samples for luma CUs.
  • the syntax element ph_max_mtt_hierarchy_depth_inter_slice is used to directly signal this value.
  • the syntax ph_log2_diff_max_bt_min_qt_inter_slice is used to signal the difference between the base 2 logarithm of the maximum size (width or height) in luma samples of a luma coding block that can be split using a binary split and the minimum size (width or height) in luma samples of a luma leaf block resulting from quadtree splitting of a CTU.
  • the syntax ph_log2_diff_max_tt_min_qt_inter_slice is used to signal the difference between the base 2 logarithm of the maximum size (width or height) in luma samples of a luma coding block that can be split using a ternary split and the minimum size (width or height) in luma samples of a luma leaf block resulting from quadtree splitting of a CTU.
  • the partition constrains are derived based on the partitioning used in the previously encoded pictures. It is common that multiple pictures use the same partition constraints, but when multiple pictures use the same partition constraints, this redundant signalling between pictures can not be reduced using the current VVC override mechanism.
  • the partition constrains are derived based on the partitioning used in the previously encoded pictures. But in current reference software of VVC (VVC Test Model version 8), when the derived partition constraints are exactly the same as the values signaled in SPS, the derived values are still signaled in PH to override the values signalled in SPS which is obviously redundant.
  • partitioning constraints are applied to four different CU splitting scenarios using corresponding syntax elements including: 1) CU splitting in inter slice, 2) CU splitting in intra slice when sps qtbtt dual tree intra is 0, 3) luma CU splitting in intra slice when sps qtbtt dual tree intra is 1, and 4) chroma CU splitting in intra slice when sps qtbtt dual tree intra is 1.
  • the above scenarios 2) and 3) share the same syntax elements since 2) and 3) are exclusive enabled.
  • partition constrain when partition constrain is mentioned, it refers to any of the above scenarios.
  • the partitioning constraints override is signaled in APS instead of PH.
  • the override information in APS when multiple pictures share the same partitioning constraints can refer to the same APS.
  • One additional APS type is created for the signaling of the override of partition constraints and the partition constraints APS can then be accessed by the pictures refer to it.
  • the partitioning constraints override for intra slices and inter slices are controlled separately by two different flags.
  • two different control flags are used to control the enabling/disabling of the override of partition constraints for inter and intra slices in PH or APS.
  • the values of partitioning constraint can be predicted by the values of the corresponding partitioning constraints in SPS. And the differences between the values in PH and the values in SPS are signaled through new syntax elements which describe the differences. For example, when the minimum size in luma samples of a luma leaf block resulting from quadtree splitting of a CTU is overridden in PH, the difference of this to-be- overridden minimum size and the minimum size derived from the syntax elements in SPS is signaled in PH through new syntax element(s). Similar to the current VVC specification, the difference can be applied to the values of the partition constraints or be applied to the log2 of the values for more efficient representations.
  • the values of the syntax elements of partitioning constraint can be predicted by the values of the corresponding syntax elements in SPS.
  • the partitioning constraint signalled in SPS is defined as the globally minimum or maximum values for the partitioning constraints for the coding of the pictures referring to the SPS.
  • the minimum size in luma samples of a luma leaf block resulting from quadtree splitting of a CTU derived from the syntax element sps_log2_diff_min_qt_min_cb_inter_slice in SPS is the allowed minimum size for coding the pictures referring to this SPS.
  • the minimum size in luma samples of a luma leaf block resulting from quadtree splitting can then be overridden in the picture header, but the size signalled in PH has to be equal to or larger than the SPS value.
  • the difference between the minimum size to be utilized in PH and the minimum size signalled in SPS is signaled in PH using a new syntax element.
  • the exemplar name is ph_log2_diff_min_qt_min_sps_qt_inter_slice.
  • the difference is derived by subtracting the log 2 of the size of the minimum QT-splitting CU to be utilized in the picture associated with the PH by the log2 value of the size of the minimum QT-splitting CU derived in SPS.
  • the maximum hierarchy depth for coding units resulting from multi-type tree splitting of a quadtree leaf derived from the syntax element sps_max_mtt_hierarchy_depth_inter_slice in SPS is the allowed maximum depth for coding the pictures referring to this SPS.
  • the maximum hierarchy depth for coding units resulting from multi-type tree splitting of a quadtree leaf can then be overridden in the picture header, but the depth signalled in PH has to be equal to or smaller than the SPS value.
  • the maximum size (width or height) in luma samples of a luma coding block that can be split using a binary split derived from the syntax element sps_log2_diff_max_bt_min_qt_inter_slice in SPS is the allowed maximum size for coding the pictures referring to this SPS.
  • the maximum size (width or height) in luma samples of a luma coding block that can be split using a binary split can then be overridden in the picture header, but the size signalled in PH has to be equal to or smaller than the SPS value.
  • the maximum size (width or height) in luma samples of a luma coding block that can be split using a ternary split derived from the syntax element sps_log2_diff_max_tt_min_qt_inter_slice in SPS is the allowed maximum size for coding the pictures referring to this SPS.
  • the maximum size (width or height) in luma samples of a luma coding block that can be split using a ternary split can then be overridden in the picture header, but the size signalled in PH has to be equal to or smaller than the SPS value.
  • the partition constrains are derived based on the partitioning used in the previously encoded pictures. But in current reference software of VVC (VVC Test Model version 8), when the derived partition constraints are exactly the same as the values signaled in SPS, the derived values are still signaled in PH to override the values signalled in SPS which is obviously redundant. In some examples, when the derived values when encoding one picture are the same as the values signaled in SPS, the control flag for the partition constraints override is set to zero (disabled) to reduce the redundant bits.
  • the above methods may be implemented using an apparatus that includes one or more circuitries, which include application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, micro-controllers, microprocessors, or other electronic components.
  • the apparatus may use the circuitries in combination with the other hardware or software components for performing the above described methods.
  • Each module, sub-module, unit, or sub-unit disclosed above may be implemented at least partially using the one or more circuitries.
  • FIG. 5 is a block diagram illustrating an exemplary apparatus for video coding in accordance with some implementations of the present disclosure.
  • the apparatus 500 may be a terminal, such as a mobile phone, a tablet computer, a digital broadcast terminal, a tablet device, or a personal digital assistant.
  • the apparatus 500 may include one or more of the following components: a processing component 502, a memory 504, a power supply component 506, a multimedia component 508, an audio component 510, an input/output (I/O) interface 512, a sensor component 514, and a communication component 516.
  • the processing component 502 usually controls overall operations of the apparatus 500, such as operations relating to display, a telephone call, data communication, a camera operation and a recording operation.
  • the processing component 502 may include one or more processors 520 for executing instructions to complete all or a part of steps of the above method.
  • the processing component 502 may include one or more modules to facilitate interaction between the processing component 502 and other components.
  • the processing component 502 may include a multimedia module to facilitate the interaction between the multimedia component 508 and the processing component 502.
  • the memory 504 is configured to store different types of data to support operations of the apparatus 500. Examples of such data include instructions, contact data, phonebook data, messages, pictures, videos, and so on for any application or method that operates on the apparatus 500.
  • the memory 504 may be implemented by any type of volatile or non-volatile storage devices or a combination thereof, and the memory 504 may be a Static Random Access Memory (SRAM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), an Erasable Programmable Read-Only Memory (EPROM), a Programmable Read-Only Memory (PROM), a Read-Only Memory (ROM), a magnetic memory, a flash memory, a magnetic disk or a compact disk.
  • SRAM Static Random Access Memory
  • EEPROM Electrically Erasable Programmable Read-Only Memory
  • EPROM Erasable Programmable Read-Only Memory
  • PROM Programmable Read-Only Memory
  • ROM Read-Only Memory
  • the power supply component 506 supplies power for different components of the apparatus 500.
  • the power supply component 506 may include a power supply management system, one or more power supplies, and other components associated with generating, managing and distributing power for the apparatus 500.
  • the multimedia component 508 includes a screen providing an output interface between the apparatus 500 and a user.
  • the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen receiving an input signal from a user.
  • the touch panel may include one or more touch sensors for sensing a touch, a slide and a gesture on the touch panel. The touch sensor may not only sense a boundary of a touching or sliding actions, but also detect duration and pressure related to the touching or sliding operation.
  • the multimedia component 508 may include a front camera and/or a rear camera. When the apparatus 500 is in an operation mode, such as a shooting mode or a video mode, the front camera and/or the rear camera may receive external multimedia data.
  • the audio component 510 is configured to output and/or input an audio signal.
  • the audio component 510 includes a microphone (MIC).
  • the microphone When the apparatus 500 is in an operating mode, such as a call mode, a recording mode and a voice recognition mode, the microphone is configured to receive an external audio signal.
  • the received audio signal may be further stored in the memory 504 or sent via the communication component 516.
  • the audio component 510 further includes a speaker for outputting an audio signal.
  • the I/O interface 512 provides an interface between the processing component 502 and a peripheral interface module.
  • the above peripheral interface module may be a keyboard, a click wheel, a button, or the like. These buttons may include but not limited to, a home button, a volume button, a start button and a lock button.
  • the sensor component 514 includes one or more sensors for providing a state assessment in different aspects for the apparatus 500. For example, the sensor component 514 may detect an on/off state of the apparatus 500 and relative locations of components. For example, the components are a display and a keypad of the apparatus 500.
  • the sensor component 514 may also detect a position change of the apparatus 500 or a component of the apparatus 500, presence or absence of a contact of a user on the apparatus 500, an orientation or acceleration/deceleration of the apparatus 500, and a temperature change of apparatus 500.
  • the sensor component 514 may include a proximity sensor configured to detect presence of a nearby object without any physical touch.
  • the sensor component 514 may further include an optical sensor, such as a CMOS or CCD image sensor used in an imaging application.
  • the sensor component 514 may further include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
  • the communication component 516 is configured to facilitate wired or wireless communication between the apparatus 500 and other devices.
  • the apparatus 500 may access a wireless network based on a communication standard, such as WiFi, 4G, or a combination thereof.
  • the communication component 516 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel.
  • the communication component 516 may further include a Near Field Communication (NFC) module for promoting short-range communication.
  • NFC Near Field Communication
  • the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra-Wide Band (UWB) technology, Bluetooth (BT) technology and other technology.
  • RFID Radio Frequency Identification
  • IrDA infrared data association
  • UWB Ultra-Wide Band
  • Bluetooth Bluetooth
  • the apparatus 500 may be implemented by one or more of Application Specific Integrated Circuits (ASIC), Digital Signal Processors (DSP), Digital Signal Processing Devices (DSPD), Programmable Logic Devices (PLD), Field Programmable Gate Arrays (FPGA), controllers, microcontrollers, microprocessors or other electronic elements to perform the above method.
  • ASIC Application Specific Integrated Circuits
  • DSP Digital Signal Processors
  • DSPD Digital Signal Processing Devices
  • PLD Programmable Logic Devices
  • FPGA Field Programmable Gate Arrays
  • controllers microcontrollers, microprocessors or other electronic elements to perform the above method.
  • a non-transitory computer readable storage medium may be, for example, a Hard Disk Drive (HDD), a Solid-State Drive (SSD), Flash memory, a Hybrid Drive or Solid-State Hybrid Drive (SSHD), a Read-Only Memory (ROM), a Compact Disc Read-Only Memory (CD-ROM), a magnetic tape, a floppy disk and etc.
  • HDD Hard Disk Drive
  • SSD Solid-State Drive
  • SSHD Solid-State Hybrid Drive
  • ROM Read-Only Memory
  • CD-ROM Compact Disc Read-Only Memory
  • magnetic tape a floppy disk and etc.
  • FIG. 6 is a flowchart illustrating an exemplary process of video coding in accordance with some implementations of the present disclosure.
  • the processor 520 receives an APS associated with a picture.
  • a syntax element for overriding partitioning constraints is signaled in the APS.
  • step 604 the processor 520 obtains override information associated with the syntax element from the APS.
  • the processor 520 is implemented on a decoder.
  • one or more other pictures associated with the partitioning constraints refer to the APS or correspond to the APS.
  • the syntax element comprises a first flag and a second flag, where the first flag is configured for enabling or disabling overriding the partitioning constraints for intra slices associated with the picture, and where the second flag is configured for enabling or disabling overriding the partitioning constraints for inter slices associated with the picture.
  • the partitioning constraints are applied in one of followings CU splitting modes: CU splitting in inter slices associated with the picture; CU splitting in intra slices associated with the picture in response to determining that a split flag equals to 0, where the split flag equalling to 0 specifies that separate codingjree syntax structure is not used for intra-coded slices; luma CU splitting in the intra slices associated with the picture in response to determining that the split flag equals to 1, where the split flag equalling to 1 specifies that for the intra-coded slices, each CTU is split into a plurality of CUs with 64x64 luma samples using an implicit quadtree split, and the plurality of CUs are roots of two separate coding tree syntax structures for luma and chroma; and chroma CU splitting in the intra slices associated with the picture in response to determining that the split flag equals to 1
  • FIG. 7 is a flowchart illustrating an exemplary process of video coding in accordance with some implementations of the present disclosure.
  • step 702 the processor 520 receives a PH associated with a picture.
  • a first flag and a second flag are signaled in the PH, the first flag is configured for enabling or disabling overriding partitioning constraints for intra slices associated with the picture, and the second flag is configured for enabling or disabling overriding the partitioning constraints for inter slices associated with the picture.
  • step 704 the processor 520 obtains override information associated with the first flag and the second flag from the PH associated with the picture.
  • the processor 520 is implemented on a decoder.
  • the partitioning constraints are applied in one of followings CU splitting modes: CU splitting in inter slices associated with the picture; CU splitting in intra slices associated with the picture in response to determining that a split flag equals to 0, where the split flag equalling to 0 specifies that separate coding_tree syntax structure is not used for intra-coded slices; luma CU splitting in the intra slices associated with the picture in response to determining that the split flag equals to 1, where the split flag equalling to 1 specifies that for the intra-coded slices, each CTU is split into a plurality of CUs with 64x64 luma samples using an implicit quadtree split, and the plurality of CUs are roots of two separate coding tree syntax structures for luma and chroma; and chroma CU splitting in the intra slices associated with the picture in response to determining that the split flag equals to 1
  • FIG. 8 is a flowchart illustrating an exemplary process of video coding in accordance with some implementations of the present disclosure.
  • step 802 the processor 502 predicts a value of a partitioning constraint according to a value of the partitioning constraint signaled in SPS associated with a picture.
  • the processor 520 is implemented on a decoder.
  • the processor 520 may further, in step 804, predict the value of the partitioning constraint according to a syntax element specifying a difference between the value of the partitioning constraint in a PH associated with the picture and the value of the partitioning constraint in the SPS.
  • the processor 520 may further, in step 806, signal the syntax element in the PH to specify a difference between the minimum size after overriding and the minimum size derived from the SPS in response to determining that a minimum size in luma samples of a luma leaf block derived from quadtree splitting of a coding tree unit is overridden in the PH.
  • the value of the partitioning constraint signaled in the SPS is a minimum value or a maximum value for the partitioning constraint for coding one or more pictures referring to the SPS.
  • the minimum value is a minimum size in luma samples of a luma leaf block derived from quadtree splitting of a CTU derived from a syntax element
  • the syntax element is signaled in the PH to specify a difference between the minimum size in the PH and the minimum size in the SPS, and the difference is derived by subtracting log2 of a size of the minimum quadtree splitting CU utilized in the picture associated with the PH by log2 value of a size of the minimum quadtree splitting CU derived in the SPS.
  • the minimum size is overridden in the PH and the minimum size in the PH is equalling to or greater than the minimum size in the SPS.
  • the maximum value is a maximum hierarchy depth for CUs derived from multi-type tree splitting of a quadtree leaf derived from a syntax element in the SPS, wherein the syntax element specifies a default maximum hierarchy depth for CUs derived from the multi-type tree splitting of the quadtree leaf in bidirectional predicted slices or predicted slices referring to the SPS, wherein the maximum hierarchy depth is overridden in the PH, and the maximum hierarchy depth in PH is equalling to or smaller than the maximum hierarchy depth in the SPS.
  • the maximum value is a maximum size in luma samples of a luma coding block that is split using a binary split derived from a syntax element in the SPS, wherein the syntax element specifies a default difference between a base 2 logarithm of the maximum size and a minimum size in luma samples of a luma leaf block derived from quadtree splitting of a CTU in bidirectional predicted slices or predicted slices referring to the SPS, wherein the maximum size is overridden in the PH, and the maximum size in PH is equalling to or smaller than the maximum size in the SPS.
  • the maximum value is a maximum size in luma samples of a luma coding block that is split using a ternary split derived from a syntax element in the SPS, wherein the syntax element specifies a default difference between a base 2 logarithm of the maximum size and a minimum size in luma samples of a luma leaf block derived from quadtree splitting of a CTU in bidirectional predicted slices or predicted slices referring to the SPS, wherein the maximum size is overridden in the PH, and the maximum size in PH is equalling to or smaller than the maximum size in the SPS.
  • FIG. 9 is a flowchart illustrating an exemplary process of video coding in accordance with some implementations of the present disclosure.
  • step 902 the processor 502 derives a value of a partition constraint associated with a picture according to a partitioning used in a previously encoded picture.
  • step 904 the processor 504 disables overriding the partition constraint in response to determining the value is the same as a value signaled in SPS associated with the picture.
  • the processor 520 is implemented on a decoder.
  • the processor 520 disables overriding the partition constraint by setting a control flag to 0 to override the partition constraint.
  • an apparatus for video coding includes one or more processors 520 and a memory 504 configured to store instructions executable by the one or more processors.
  • the processor 520 upon execution of the instructions, is configured to perform the method illustrated in FIG. 6.
  • the processor 520 is configured to perform acts including: receiving an APS associated with a picture and obtaining, by the decoder, override information associated with the syntax element from the APS.
  • a syntax element for overriding partitioning constraints is signaled in the APS.
  • one or more other pictures associated with the partitioning constraints refer to the APS or correspond to the APS.
  • the syntax element comprises a first flag and a second flag
  • the first flag is configured for enabling or disabling overriding the partitioning constraints for intra slices associated with the picture
  • the second flag is configured for enabling or disabling overriding the partitioning constraints for inter slices associated with the picture.
  • the partitioning constraints are applied in one of followings CU splitting modes: CU splitting in inter slices associated with the picture; CU splitting in intra slices associated with the picture in response to determining that a split flag equals to 0, wherein the split flag equalling to 0 specifies that separate codingjree syntax structure is not used for intra-coded slices; luma CU splitting in the intra slices associated with the picture in response to determining that the split flag equals to 1, wherein the split flag equalling to 1 specifies that for the intra-coded slices, each CTU is split into a plurality of CUs with 64x64 luma samples using an implicit quadtree split, and the plurality of CUs are roots of two separate coding tree syntax structures for luma and chroma; and chroma CU splitting in the intra slices associated with the picture in response to determining that the split flag equals to 1
  • an apparatus for video coding includes one or more processors 520 and a memory 504 configured to store instructions executable by the one or more processors.
  • the processor 520 upon execution of the instructions, is configured to perform the method illustrated in FIG. 7.
  • the processor 520 is configured to perform acts including: receiving a PH associated with a picture.
  • a first flag and a second flag are signaled in the PH, the first flag is configured for enabling or disabling overriding partitioning constraints for intra slices associated with the picture, and the second flag is configured for enabling or disabling overriding the partitioning constraints for inter slices associated with the picture.
  • the processor 520 is further configured to perform acts including: obtaining override information associated with the first flag and the second flag from the PH associated with the picture.
  • the partitioning constraints are applied in one of followings CU splitting modes: CU splitting in inter slices associated with the picture; CU splitting in intra slices associated with the picture in response to determining that a split flag equals to 0, wherein the split flag equalling to 0 specifies that separate coding_tree syntax structure is not used for intra-coded slices; luma CU splitting in the intra slices associated with the picture in response to determining that the split flag equals to 1, wherein the split flag equalling to 1 specifies that for the intra-coded slices, each CTU is split into a plurality of CUs with 64x64 luma samples using an implicit quadtree split, and the plurality of CUs are roots of two separate coding tree syntax structures for luma and chroma; and chroma CU splitting in the intra slices associated with the picture in response to determining that the split flag equals to 1
  • an apparatus for video coding includes one or more processors 520 and a memory 504 configured to store instructions executable by the one or more processors.
  • the processor 520 upon execution of the instructions, is configured to perform the method illustrated in FIG. 8.
  • the processor 520 is configured to perform acts including: predicting a value of a partitioning constraint according to a value of the partitioning constraint signaled in SPS associated with a picture.
  • the processor 520 is configured to perform acts further including: predicting the value of the partitioning constraint according to a syntax element specifying a difference between the value of the partitioning constraint in a PH associated with the picture and the value of the partitioning constraint in the SPS.
  • the processor 520 is configured to perform acts further including: in response to determining that a minimum size in luma samples of a luma leaf block derived from quadtree splitting of a coding tree unit is overridden in the PH, signaling the syntax element in the PH to specify a difference between the minimum size after overriding and the minimum size derived from the SPS.
  • the value of the partitioning constraint signaled in the SPS is a minimum value or a maximum value for the partitioning constraint for coding one or more pictures referring to the SPS.
  • the minimum value is a minimum size in luma samples of a luma leaf block derived from quadtree splitting of a CTU derived from a syntax element
  • the syntax element is signaled in the PH to specify a difference between the minimum size in the PH and the minimum size in the SPS
  • the difference is derived by subtracting log2 of a size of the minimum quadtree splitting CU utilized in the picture associated with the PH by log2 value of a size of the minimum quadtree splitting CU derived in the SPS.
  • the minimum size is overridden in the PH and the minimum size in the PH is equalling to or greater than the minimum size in the SPS.
  • the maximum value is a maximum hierarchy depth for CUs derived from multi-type tree splitting of a quadtree leaf derived from a syntax element in the SPS, wherein the syntax element specifies a default maximum hierarchy depth for CUs derived from the multi-type tree splitting of the quadtree leaf in bidirectional predicted slices or predicted slices referring to the SPS, wherein the maximum hierarchy depth is overridden in the PH, and the maximum hierarchy depth in PH is equalling to or smaller than the maximum hierarchy depth in the SPS.
  • the maximum value is a maximum size in luma samples of a luma coding block that is split using a binary split derived from a syntax element in the SPS, wherein the syntax element specifies a default difference between a base 2 logarithm of the maximum size and a minimum size in luma samples of a luma leaf block derived from quadtree splitting of a CTU in bidirectional predicted slices or predicted slices referring to the SPS, wherein the maximum size is overridden in the PH, and the maximum size in PH is equalling to or smaller than the maximum size in the SPS.
  • the maximum value is a maximum size in luma samples of a luma coding block that is split using a ternary split derived from a syntax element in the SPS, wherein the syntax element specifies a default difference between a base 2 logarithm of the maximum size and a minimum size in luma samples of a luma leaf block derived from quadtree splitting of a CTU in bidirectional predicted slices or predicted slices referring to the SPS, wherein the maximum size is overridden in the PH, and the maximum size in PH is equalling to or smaller than the maximum size in the SPS.
  • an apparatus for video coding includes one or more processors 520 and a memory 504 configured to store instructions executable by the one or more processors.
  • the processor 520 upon execution of the instructions, is configured to perform the method illustrated in FIG. 9.
  • the processor 520 is configured to perform acts including: deriving a value of a partition constraint associated with a picture according to a partitioning used in a previously encoded picture; and in response to determining the value is the same as a value signaled in SPS associated with the picture, disabling overriding the partition constraint.
  • the processor 520 is configured to perform disabling overriding the partition constraint by setting a control flag to 0 to override the partition constraint.
  • a non-transitory computer-readable storage medium for video coding computer- executable instructions that, when executed by one or more computer processors 520, causing the one or more computer processors 520 to perform the method illustrated in FIG. 6.
  • non-transitory computer-readable storage medium for video coding.
  • the non-transitory computer-readable storage medium computer- executable instructions that, when executed by one or more computer processors 520, causing the one or more computer processors 520 to perform the method illustrated in FIG. 7.
  • non-transitory computer-readable storage medium for video coding.
  • the non-transitory computer-readable storage medium computer- executable instructions that, when executed by one or more computer processors 520, causing the one or more computer processors 520 to perform the method illustrated in FIG. 8.
  • non-transitory computer-readable storage medium for video coding.
  • the non-transitory computer-readable storage medium computer- executable instructions that, when executed by one or more computer processors 520, causing the one or more computer processors 520 to perform the method illustrated in FIG. 9.

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Abstract

L'invention concerne des procédés et des appareils de codage vidéo. Le procédé comprend le fait qu'un décodeur reçoit un ensemble de paramètres d'adaptation (APS) associé à une image, un élément de syntaxe pour annuler les contraintes de partitionnement étant signalé dans l'APS et obtenir, par le décodeur, des informations d'annulation associées à l'élément de syntaxe provenant de l'APS.
PCT/US2021/032110 2020-05-18 2021-05-12 Signalisation d'éléments de syntaxe dans un codage vidéo WO2021236400A1 (fr)

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