WO2020263799A1 - Syntaxe de haut niveau pour commander la conception de transformée - Google Patents

Syntaxe de haut niveau pour commander la conception de transformée Download PDF

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WO2020263799A1
WO2020263799A1 PCT/US2020/039088 US2020039088W WO2020263799A1 WO 2020263799 A1 WO2020263799 A1 WO 2020263799A1 US 2020039088 W US2020039088 W US 2020039088W WO 2020263799 A1 WO2020263799 A1 WO 2020263799A1
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transform
coding unit
block
decoding
mts
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PCT/US2020/039088
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English (en)
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Karam NASAR
Fabrice Leleannec
Michel Kerdranvat
Tangi POIRIER
Fabrice Urban
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Interdigital Vc Holdings, Inc.
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Publication of WO2020263799A1 publication Critical patent/WO2020263799A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/12—Selection from among a plurality of transforms or standards, e.g. selection between discrete cosine transform [DCT] and sub-band transform or selection between H.263 and H.264
    • 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
    • H04N19/46—Embedding additional information in the video signal during the compression process
    • 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
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/625—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding using discrete cosine transform [DCT]
    • 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
    • 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
    • H04N19/179—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 scene or a shot
    • 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
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
    • H04N19/51—Motion estimation or motion compensation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques
    • 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
    • H04N19/80—Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation
    • H04N19/82—Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation involving filtering within a prediction loop
    • 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
    • H04N19/85—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression

Definitions

  • At least one of the present embodiments generally relates to, e.g., a method or an apparatus for video encoding or decoding, and more particularly, to a method or an apparatus comprising obtaining a transform design of a block of residue for intra sub-partitioning (ISP) and subblock transform (SBT), or for Low-Frequency Non-Separable Transform (LFNST) with Multiple Transform Selection (MTS).
  • ISP intra sub-partitioning
  • SBT subblock transform
  • LNNST Low-Frequency Non-Separable Transform
  • MTS Multiple Transform Selection
  • the domain technical field of the one or more implementations is generally related to video compression. At least some embodiments relate to improving compression efficiency compared to existing video compression systems such as HEVC (HEVC refers to High Efficiency Video Coding, also known as H.265 and MPEG-H Part 2 described in "ITU-T H.265 Telecommunication standardization sector of ITU (10/2014), series H: audiovisual and multimedia systems, infrastructure of audiovisual services - coding of moving video, High efficiency video coding, Recommendation ITU-T H.265"), or compared to under development video compression systems such WC (Versatile Video Coding, a new standard being developed by JVET, the Joint Video Experts Team).
  • HEVC High Efficiency Video Coding
  • At least some embodiments further relate at improving the video compression efficiency in terms of bitrate saving or complexity reduction by improving the transform design of two new coding tools, named intra sub-partitioning (ISP) and subblock transform (SBT), which are new tools adopted into WC.
  • ISP intra sub-partitioning
  • SBT subblock transform
  • At least some embodiments further relate at improving the video compression efficiency in terms of bitrate saving or complexity reduction by improving the transform design by using the transform skip mode in combination with the Multiple Transform Selection (MTS), and MTS combined with Low-Frequency Non-Separable Transform (LFNST).
  • MTS Multiple Transform Selection
  • LNNST Low-Frequency Non-Separable Transform
  • the purpose of the invention is to overcome at least one of the disadvantages of the prior art.
  • a method for encoding comprises determining at least one syntax element related to enabling multiple transform selection; determining, based on the at least one syntax element, a horizontal transform or a vertical transform used in a transform method to apply to a block of residue; and encoding a block of a picture according to the obtained horizontal transform or vertical transform.
  • the horizontal transform or vertical transform of a transform method are set to the core transform DCT2 in case said at least one syntax element disabled the multiple transform selection.
  • the method allows ISP or SBT tools even if only DCT2 is allowed in the encoder/decoder.
  • a method for decoding comprises decoding at least one syntax element related to enabling multiple transform selection; obtaining, based on the at least one syntax element, a horizontal transform or a vertical transform used in a transform method to apply to a block of residue; and decoding a block of a picture according to the obtained horizontal transform or vertical transform.
  • the horizontal transform or vertical transform of a transform method are set to the core transform DCT2 in case said at least one syntax element disabled the multiple transform selection.
  • a method for encoding comprises parsing the residual data contained in the coding unit; determining the use of non-separable secondary transform for the coding unit, according to a primary transform related information associated to the coding unit and according to some coded block flag information associated to the coding unit, wherein if no non-zero residual luma block is contained in the coding unit or if the primary transform information indicates the use of a primary 2D transform pair different from core transform DCT2 in each direction, then no secondary transform is used for the coding unit; and encoding the coding unit according to the determined usage of non-separable secondary transform.
  • a method for decoding comprises parsing the residual data contained in the coding unit; determining the use of non-separable secondary transform for the coding unit, according to a primary transform related information associated to the coding unit and according to some coded block flag information associated to the coding unit, wherein if no non-zero residual luma block is contained in the coding unit or if the primary transform information indicates the use of a primary 2D transform pair different from core transform DCT2 in each direction, then no secondary transform is used for the coding unit; and decoding coding unit according to the determined usage of non-separable secondary transform.
  • an apparatus for encoding comprising means for implementing any one of the embodiments of the encoding methods.
  • an apparatus for decoding comprising means for implementing any one of the embodiments of the decoding methods.
  • an apparatus for encoding comprising one or more processors, and at least one memory.
  • the one or more processors is configured to implement any one of the embodiments of the encoding methods.
  • an apparatus for decoding comprising one or more processors and at least one memory.
  • the one or more processors is configured to implement any one of the embodiments of the decoding methods.
  • a non-transitory computer readable medium is presented containing data content generated according to the method or the apparatus of any of the preceding descriptions.
  • a signal comprising video data generated according to the method or the apparatus of any of the preceding descriptions.
  • One or more of the present embodiments also provide a computer readable storage medium having stored thereon instructions for encoding or decoding video data according to any of the methods described above.
  • the present embodiments also provide a computer readable storage medium having stored thereon a bitstream generated according to the methods described above.
  • the present embodiments also provide a method and apparatus for transmitting the bitstream generated according to the methods described above.
  • the present embodiments also provide a computer program product including instructions for performing any of the methods described.
  • FIG. 1 illustrates a block diagram of an embodiment of video encoder in which various aspects of the embodiments may be implemented
  • FIG. 2 illustrates a block diagram of an embodiment of video encoder in which various aspects of the embodiments may be implemented
  • FIG. 3 illustrates a block diagram of an example apparatus in which various aspects of the embodiments may be implemented
  • FIG. 4 illustrates an example of a decoding method according to a general aspect of at least one embodiment
  • FIG.5 illustrates an example of an encoding method according to a general aspect of at least one embodiment
  • FIG. 6 illustrates another example of a decoding method according to a general aspect of at least one embodiment
  • FIG. 7 illustrates another example of a encoding method according to a general aspect of at least one embodiment.
  • the various embodiments are described with respect to the encoding/decoding of a picture. They may be applied to encode/decode a part of picture, such as a slice or a tile, or a whole sequence of pictures. Besides, various embodiments are described with respect to the decoding of blocks (for example a coding unit CU) and are easily derived to the coding of blocks.
  • blocks for example a coding unit CU
  • each of the methods comprises one or more steps or actions for achieving the described method. Unless a specific order of steps or actions is required for proper operation of the method, the order and/or use of specific steps and/or actions may be modified or combined.
  • VTS Versatile Video Coding
  • ISP intra sub-partitioning
  • SBT subblock transform
  • DCT8 and DST7 are selected regardless of mts_enabled_flag. Therefore, if the encoder is not equipped with DCT8/DST7, the two tools of ISP and SBT need to be switched off, which leads to large coding loss. It is desirable to solve the deficiency.
  • At least one embodiment of the present principles comprises controlling the transform design of ISP and SBT via a high level syntax.
  • the syntax modifies the transforms of ISP and SBT to the core DCT2 so that the both tools are activated even with an encoder that does not support the implementation of DCT8 and DST7.
  • WC it is also possible to bypass the transform of residual coefficients, using transform skip (TSkip) mode.
  • TSkip transform skip
  • WC defines a new tool allowing an additional transform stage applying only for Intra coded block called Low-Frequency Non-Separable Transform (LFNST).
  • Low-Frequency Non-Separable Transform (LFNST) is one implementation of a Non- Separable Secondary Transforms (NSST), and both terms can be use indifferently in the following.
  • the MTS and LFNST residual coding modes can be used in combination and require signaling to transmit the coding mode used.
  • At least one embodiment of the present principles comprises selectively enabling LFNST depending on MTS usage. This advantageously reduces encoding time with reduced compression gain loss.
  • ISP is a tool that splits an intra coded transform block into horizontal and or vertical sub-blocks. It either splits the block into 4 or 2 subblocks, depending on the dimension of the block. In the case where, the width of the transform subblock is larger than or equal to 4 and lower than or equal to 16, then DST7 is selected as transform for horizontal direction else DCT2 is selected. Similarly, in the case where, the height of the transform subblock is larger than or equal to 4 and lower or equal to 16, then DST7 is selected as transform for vertical direction else DCT2 is selected.
  • transform selection for the residual subblocks in the horizontal (trH) and vertical (trV) directions is as follows:
  • Width and Height are the width and height of the transform subblocks.
  • SBT is a split tool for inter coded transform blocks. SBT splits horizontally or vertically the transform block into two subblocks, where one block is set to zero and the other is transformed and quantized. The transform selection depends on the type of the split (horizontal or vertical) and the position of the subblock, as follows:
  • a limitation of both ISP and SBT tools is that the tools can only be used if MTS is implemented. In other words, if DST7 and DCT8 are not implemented in the encoder, the tools need to be switched off.
  • this light-weight encoder losses 1 % of the original latest WC test model software.
  • At least one embodiment of the present principles improves such a light-weight encoder by allowing ISP and SBT to be used even without implementing DST7 and DCT8.
  • FIG. 4 illustrates an example of a decoding method according to a general aspect of at least one embodiment.
  • the decoding method 10 comprises, in a step 1 1 , decoding at least one syntax element that is used to control horizontal or vertical transform used in ISP or SBT.
  • the syntax element is a dedicated high-level syntax flag that controls the transform selection for ISP and SBT.
  • the syntax element is the syntax element (sps_mts_enabled_flag) enabling multiple transform selection.
  • a horizontal transform and/or a vertical transform used in a transform method to apply to a block of residue is obtained at least according to the decoded syntax element.
  • the horizontal transform or vertical transform of a transform method used in an Intra Sub Partitioning ISP or a Sub Block Transform SBT is controlled by the at least one syntax element.
  • the horizontal transform or vertical transform of a transform method used in an Intra Sub Partitioning ISP or a Sub Block Transform SBT is set to the core transform DCT2 in case said at least one syntax element disabled the multiple transform selection. Then, in a step 13, the obtained horizontal transform or vertical transform (or more precisely the inverse transform) is applied to transformed coefficients to obtain residuals of the block to decode, wherein for instance the transform method uses Intra Sub Partitioning ISP or a Sub Block T ransform SBT.
  • FIG. 5 illustrates an example of an encoding method according to a general aspect of at least one embodiment.
  • the encoding method 20 comprises, in a step 21 , determining and encoding at least one syntax element that is used to control horizontal or vertical transform used in ISP or SBT.
  • the syntax element is a dedicated high-level syntax flag that controls the transform selection for ISP and SBT.
  • the syntax element is the syntax element (sps_mts_enabled_flag) enabling multiple transform selection.
  • a horizontal transform and/or a vertical transform used in a transform method to apply to a block of residue is obtained at least according to the decoded syntax element.
  • the horizontal transform or vertical transform of a transform method used in an Intra Sub Partitioning ISP or a Sub Block Transform SBT is controlled by the at least one syntax element.
  • the horizontal transform or vertical transform of a transform method used in an Intra Sub Partitioning ISP or a Sub Block T ransform SBT is set to the core transform DCT2 in case said at least one syntax element disabled the multiple transform selection.
  • the overall process of the choice for coding parameters based on RDO is not detailed here, however the skilled in the art will understand that a transform scheme is defined that for instance specifies usage of ISP or SBT while DST7 nor DCT8 are not configurable as coding parameters.
  • the obtained horizontal transform or vertical transform is applied to residuals of the block to encode wherein for instance the transform method applied to residuals of the block uses Intra Sub Partitioning ISP or a Sub Block Transform SBT.
  • At least one embodiment proposes to define a high-level syntax flag that controls the transform selection for ISP and SBT.
  • the flag is enabled, the core transform DCT2 is selected for both the horizontal and vertical direction instead of DST7 or DCT8.
  • At least one embodiment comprises determining a high-level flag that specifies whether to use the default transform selection for ISP and/or SBT or to use DCT2 only.
  • a flag named dst7_dct8_allowed is defined, the flag dst7_dct8_allowed is representative of whether DST7 and DCT8 are allowed or not, the transform selection of ISP becomes:
  • a flag named dst7_dct8_allowed is defined, the flag dst7_dct8_allowed being representative of whether DST7 or DCT8 are allowed or not, the transform selection of SBT becomes:
  • the video compression efficiency in terms of bitrate saving is preserved using the flag dst7_dct8_allowed as illustrated in the above simulation results.
  • the simulation of previous section is repeated, i.e. a simulation is run with the latest WC test model software and the common testing conditions.
  • the anchor simulation is run with MTS, ISP and SBT enabled, and the test simulation is run with MTS disabled and both ISP and SBT tools enabled with the dst7_dct8_allowed disabled. That is:
  • the at least one embodiment advantageously reduces the initial loss of 1 to 0.48%, due to enabling ISP and SBT with DCT2.
  • Another simulation is also run to understand the loss due to replacing the default transform selection by DCT2.
  • the anchor simulation is run with MTS disabled and ISP and SBT enabled, and the test simulation is run with MTS disabled and both ISP and SBT tools enabled with the dst7 dct8 allowed disabled. That is:
  • the at least one embodiment advantageously reduces the initial loss of 0.7% to 0.16%. That is, a large reduction of loss is achieved by enabling ISP and SBT with DCT2.
  • the at least one embodiment advantageously allows using ISB and SBT with DCT2, instead of completely switching them off. This is done with the following simulation where the anchor simulation is run with MTS, ISP SBT disabled, and the test simulation is run with MTS disabled and both ISP and SBT tools enabled with the dst7_dct8_allowed disabled
  • 0.5% gain can be achieved for a light-weight encoder using the at least one embodiment.
  • At least one embodiment wherein the high-level syntax flag controlling the transform selection for ISP and SBT is mts_enabled_flag
  • the flag mts_enabled_flag is used for controlling the transform selection for ISP and SBT.
  • mts_enabled_flag is an SPS flag that is activated when any of the following SPS flags are activated:
  • the flag mts_intra_enabled_flag is used for controlling the transform selection for ISP as it is associated with intra blocks, and the flag mts_inter_enabled_flag for SBT since the flag is associated with inter.
  • the selection mechanism becomes:
  • a new flag dst7_dct8_allowed is used for controlling the transform selection for ISP and SBT. Accordingly, instead of using the existing flag mts_enabled_flag, another flag is added such that it controls the transform design of transform subblock.
  • a new flag intra_dst7_dct8_allowed is used for controlling the transform selection for ISP and a new flag inter_dst7_dct8_allowed is used for controlling the transform selection for SBT. Accordingly, the inter flag inter_dst7_dct8_allowed controls SBT and the intra flag intra_dst7_dct8_allowed controls ISP.
  • an SPS flag is coded for SBT only if the implicit transform selected is enabled.
  • the implicit transform selection is a special transform mode where a combination between DCT2 and DST7 is enabled. When this flag is enabled, the encoder must me be equipped with DST7 and DCT2, but not necessarily DCT8. Therefore, for a low memory encoder, it would be desirable to remove DCT8 as it is only used for SBT, and replace the transform by DCT2.
  • a new flag SPS_SBT_DCT8_Flag is used for controlling the SBT transform selection.
  • the flag SPS_SBT_DCT8_Flag is enabled (set to one)
  • the default implicit transform selection for SBT combining DCT2 and DST7 is selected, else DCT2 is selected as transform for SBT.
  • variable implicitMtsEnabled is derived as follows:
  • IntraSubPartitionsSplitType is not equal to ISP_NO_SPLIT - cu_sbt_flag is equal to 1 and Max( nTbW, nTbH ) is less than or equal to 32 and
  • the SPS_SBT_DCT8_Flag flag is coded regardless of MTS configuration. That is, SPS_SBT_DCT2_is coded as follows (bold underlined):
  • the two flags for SBT and ISP are coded when MTS is enabled. This means that SBT and ISP can switch from their implicit transform to selection if the encoder is using DST7 and DCT8. The following spec change is therefore (bold underlined):
  • sps_isp_dct2_flag controls the transform design for ISP
  • sps_sbt_dct2_flag controls the SBT transform selection. Both flags if set to zero, the transform selection respectivelybecomes DCT2 for ISP and SBT.
  • the high-level syntax flag controlling the transform selection for ISP and SBT is signaled in a slice/tile header indicating that all Luma CUs in the slice/tile use this transform selection for ISP and SBT.
  • the high-level syntax flag controlling the transform selection for ISP and SBT is signaled in in the Picture Parameter Set (PPS) indicating that all Luma CUs in a frame use this transform selection for ISP and SBT.
  • PPS Picture Parameter Set
  • the high-level syntax flag controlling the transform selection for ISP and SBT is signaled in in the Sequence Parameter Set (SPS) indicating that all Luma CUs in the sequence use this transform selection for ISP and SBT.
  • SPS Sequence Parameter Set
  • MTS_enabled_flag a flag is set to enable/disable the Multiple Transform Set
  • MTS index value MTS transform index to use with one particular TU - tu_mts_idx
  • nb_MTS_modes 4
  • T_skip The transform skip flag ( T_skip ) is set to deactivate transform and directly code residuals in the spatial domain.
  • the secondary transform is applied in blocks having at least
  • the number of non-zero coefficients is counted across all TU contained in the considered CU.
  • a multiple transform set is only applied in Luma transform block. Therefore, inferring the non-usage of LFNST based on the MTS information of the CU may not be applicable in the scope of WC specification for some cases. It is applicable given that the MTS information is available for the considered CU, i.e. it is signaled for that CU.
  • the LFNST usage and mode is shared between Luma and Chroma components, which means the same LFNST index is used for Luma and Chroma.
  • MTS information is not signaled if the Luma residual of a given CU (e.g., tu_cbf_luma) is zero.
  • the test driven on the decoder side to infer the non-usage of LFNST for a given CU is modified compared to the WC specification according to the following WC coding unit syntax table.
  • LFNST index e.g., Ifnstjdx
  • MTS MTS
  • LFNST may be used only if MTS is not used for the considered CU (DCT2 is used as the primary transform) or if MTS is used but the first primary transform pair in the set of multiple primary transforms other than DCT2 is employed for the considered CU.
  • variable cu_cbf_luma is a variable computed by the decoder, which is representative of the fact that the CU contains some non-zero luma residual data. In a particular embodiment, it is set equal to the cu_cbf_luma flag associated to the first TU (transform unit) contained in the considered coding unit. This flag indicates, in the WC specification, that the considered TU contains non-zero residual data in its luma transform block.
  • the secondary transform index is inferred to 0, which means the decoder infers that no LFNST is used in the whole CU, including in chroma transform units.
  • FIG. 6 illustrates an example of a decoding method according to a general aspect of at least one embodiment.
  • the decoding method 10 comprises decoding at least one coding unit received in a bitstream, said coding unit belonging to a picture region where a single coding tree is used for luma and chroma for a block-based representation of a coding unit.
  • the inverse transform process in used in the decoding method in a step 14, the residual data contained in the coding unit are parsed. Then, in a step 15, the use of non-separable secondary transform for the coding unit is determined according to a primary transform related information associated to the coding unit and according to some coded block flag information associated to the coding unit.
  • the transformed coefficients of coding unit are inverse transformed according to the determined usage of non-separable secondary transform.
  • FIG. 7 illustrates an example of an encoding method according to a general aspect of at least one embodiment.
  • the encoding method 20 comprises encoding at least one coding unit received in a bitstream, said coding unit belonging to a picture region where a single coding tree is used for luma and chroma for a block-based representation of a coding unit.
  • the transform process in used in the encoding method in a step 24, the residual data contained in the coding unit are parsed.
  • the possible usage of non-separable secondary transform for the coding unit is determined according to a primary transform related information associated to the coding unit and according to some coded block flag information associated to the coding unit.
  • FIGs. 1 , 2 and 3 provide some embodiments, but other embodiments are contemplated and the discussion of FIGs. 1 , 2 and 3 does not limit the breadth of the implementations.
  • At least one of the aspects generally relates to video encoding and decoding, and at least one other aspect generally relates to transmitting a bitstream generated or encoded.
  • These and other aspects can be implemented as a method, an apparatus, a computer readable storage medium having stored thereon instructions for encoding or decoding video data according to any of the methods described, and/or a computer readable storage medium having stored thereon a bitstream generated according to any of the methods described.
  • the terms “reconstructed” and “decoded” may be used interchangeably, the terms “pixel” and “sample” may be used interchangeably, the terms “image,”“picture” and“frame” may be used interchangeably.
  • the term“reconstructed” is used at the encoder side while“decoded” is used at the decoder side.
  • Various methods and other aspects described in this application can be used to modify modules, for example, the residual coding, and/or decoding modules (125, 145, 230, 250) of a video encoder 100 and decoder 200 as shown in FIG. 1 and FIG. 2.
  • the present aspects are not limited to WC or HEVC, and can be applied, for example, to other standards and recommendations, whether pre-existing or future-developed, and extensions of any such standards and recommendations (including WC and HEVC).
  • the aspects described in this application can be used individually or in combination.
  • Various numeric values are used in the present application. The specific values are for example purposes and the aspects described are not limited to these specific values.
  • FIG. 1 illustrates an encoder 100. Variations of this encoder 100 are contemplated, but the encoder 100 is described below for purposes of clarity without describing all expected variations.
  • the video sequence may go through pre-encoding processing (101), for example, applying a color transform to the input color picture (e.g., conversion from RGB 4:4:4 to YCbCr 4:2:0), or performing a remapping of the input picture components in order to get a signal distribution more resilient to compression (for instance using a histogram equalization of one of the color components).
  • Metadata can be associated with the preprocessing, and attached to the bitstream.
  • a picture is encoded by the encoder elements as described below.
  • the picture to be encoded is partitioned (102) and processed in units of, for example, CUs.
  • Each unit is encoded using, for example, either an intra or inter mode.
  • intra prediction 160
  • inter mode motion estimation (175) and compensation (170) are performed.
  • the encoder decides (105) which one of the intra mode or inter mode to use for encoding the unit, and indicates the intra/inter decision by, for example, a prediction mode flag.
  • Prediction residuals are calculated, for example, by subtracting (1 10) the predicted block from the original image block.
  • the prediction residuals are then transformed (125) and quantized (130).
  • the quantized transform coefficients, as well as motion vectors and other syntax elements, are entropy coded (145) to output a bitstream.
  • the encoder can skip the transform and apply quantization directly to the non-transformed residual signal.
  • the encoder can bypass both transform and quantization, i.e., the residual is coded directly without the application of the transform or quantization processes.
  • the encoder decodes an encoded block to provide a reference for further predictions.
  • the quantized transform coefficients are de-quantized (140) and inverse transformed (150) to decode prediction residuals.
  • In-loop filters (165) are applied to the reconstructed picture to perform, for example, deblocking/SAO (Sample Adaptive Offset) filtering to reduce encoding artifacts.
  • the filtered image is stored at a reference picture buffer (180).
  • FIG. 2 illustrates a block diagram of a video decoder 200.
  • a bitstream is decoded by the decoder elements as described below.
  • Video decoder 200 generally performs a decoding pass reciprocal to the encoding pass as described in FIG. 1.
  • the encoder 100 also generally performs video decoding as part of encoding video data.
  • the input of the decoder includes a video bitstream, which can be generated by video encoder 100.
  • the bitstream is first entropy decoded (230) to obtain transform coefficients, motion vectors, and other coded information.
  • the picture partition information indicates how the picture is partitioned.
  • the decoder may therefore divide (235) the picture according to the decoded picture partitioning information.
  • the transform coefficients are de- quantized (240) and inverse transformed (250) to decode the prediction residuals.
  • Combining (255) the decoded prediction residuals and the predicted block an image block is reconstructed.
  • the predicted block can be obtained (270) from intra prediction (260) or motion-compensated prediction (i.e., inter prediction) (275).
  • In-loop filters (265) are applied to the reconstructed image.
  • the filtered image is stored at a reference picture buffer (280).
  • the decoded picture can further go through post-decoding processing (285), for example, an inverse color transform (e.g. conversion from YCbCr 4:2:0 to RGB 4:4:4) or an inverse remapping performing the inverse of the remapping process performed in the pre-encoding processing (101).
  • post-decoding processing can use metadata derived in the preencoding processing and signaled in the bitstream.
  • FIG. 3 illustrates a block diagram of an example of a system in which various aspects and embodiments are implemented.
  • System 1000 can be embodied as a device including the various components described below and is configured to perform one or more of the aspects described in this document. Examples of such devices, include, but are not limited to, various electronic devices such as personal computers, laptop computers, smartphones, tablet computers, digital multimedia set top boxes, digital television receivers, personal video recording systems, connected home appliances, and servers.
  • Elements of system 1000, singly or in combination can be embodied in a single integrated circuit (IC), multiple ICs, and/or discrete components.
  • the processing and encoder/decoder elements of system 1000 are distributed across multiple ICs and/or discrete components.
  • system 1000 is communicatively coupled to one or more other systems, or other electronic devices, via, for example, a communications bus or through dedicated input and/or output ports.
  • system 1000 is configured to implement one or more of the aspects described in this document.
  • the system 1000 includes at least one processor 1010 configured to execute instructions loaded therein for implementing, for example, the various aspects described in this document.
  • Processor 1010 can include embedded memory, input output interface, and various other circuitries as known in the art.
  • the system 1000 includes at least one memory 1020 (e.g., a volatile memory device, and/or a non-volatile memory device).
  • System 1000 includes a storage device 1040, which can include non-volatile memory and/or volatile memory, including, but not limited to, Electrically Erasable Programmable Read-Only Memory (EEPROM), Read-Only Memory (ROM), Programmable Read-Only Memory (PROM), Random Access Memory (RAM), Dynamic Random Access Memory (DRAM), Static Random Access Memory (SRAM), flash, magnetic disk drive, and/or optical disk drive.
  • the storage device 1040 can include an internal storage device, an attached storage device (including detachable and non-detachable storage devices), and/or a network accessible storage device, as non-limiting examples.
  • System 1000 includes an encoder/decoder module 1030 configured, for example, to process data to provide an encoded video or decoded video, and the encoder/decoder module 1030 can include its own processor and memory.
  • the encoder/decoder module 1030 represents module(s) that can be included in a device to perform the encoding and/or decoding functions. As is known, a device can include one or both of the encoding and decoding modules. Additionally, encoder/decoder module 1030 can be implemented as a separate element of system 1000 or can be incorporated within processor 1010 as a combination of hardware and software as known to those skilled in the art.
  • processor 1010 Program code to be loaded onto processor 1010 or encoder/decoder 1030 to perform the various aspects described in this document can be stored in storage device 1040 and subsequently loaded onto memory 1020 for execution by processor 1010.
  • processor 1010, memory 1020, storage device 1040, and encoder/decoder module 1030 can store one or more of various items during the performance of the processes described in this document.
  • Such stored items can include, but are not limited to, the input video, the decoded video or portions of the decoded video, the bitstream, matrices, variables, and intermediate or final results from the processing of equations, formulas, operations, and operational logic.
  • memory inside of the processor 1010 and/or the encoder/decoder module 1030 is used to store instructions and to provide working memory for processing that is needed during encoding or decoding.
  • a memory external to the processing device (for example, the processing device can be either the processor 1010 or the encoder/decoder module 1030) is used for one or more of these functions.
  • the external memory can be the memory 1020 and/or the storage device 1040, for example, a dynamic volatile memory and/or a non-volatile flash memory.
  • an external non-volatile flash memory is used to store the operating system of, for example, a television.
  • a fast external dynamic volatile memory such as a RAM is used as working memory for video coding and decoding operations, such as for MPEG-2 (MPEG refers to the Moving Picture Experts Group, MPEG-2 is also referred to as ISO/IEC 13818, and 13818-1 is also known as H.222, and 13818-2 is also known as H.262), HEVC (HEVC refers to High Efficiency Video Coding, also known as H.265 and MPEG-H Part 2), or WC (Versatile Video Coding, a new standard being developed by JVET, the Joint Video Experts Team).
  • MPEG-2 MPEG refers to the Moving Picture Experts Group
  • MPEG-2 is also referred to as ISO/IEC 13818
  • 13818-1 is also known as H.222
  • 13818-2 is also known as H.262
  • HEVC High Efficiency Video Coding
  • WC Very Video Coding
  • the input to the elements of system 1000 can be provided through various input devices as indicated in block 1 130.
  • Such input devices include, but are not limited to, (i) a radio frequency (RF) portion that receives an RF signal transmitted, for example, over the air by a broadcaster, (ii) a Component (COMP) input terminal (or a set of COMP input terminals), (iii) a Universal Serial Bus (USB) input terminal, and/or (iv) a High Definition Multimedia Interface (HDMI) input terminal.
  • RF radio frequency
  • COMP Component
  • USB Universal Serial Bus
  • HDMI High Definition Multimedia Interface
  • the input devices of block 1 130 have associated respective input processing elements as known in the art.
  • the RF portion can be associated with elements suitable for (i) selecting a desired frequency (also referred to as selecting a signal, or band-limiting a signal to a band of frequencies), (ii) downconverting the selected signal, (iii) band-limiting again to a narrower band of frequencies to select (for example) a signal frequency band which can be referred to as a channel in certain embodiments, (iv) demodulating the downconverted and band-limited signal, (v) performing error correction, and (vi) demultiplexing to select the desired stream of data packets.
  • the RF portion of various embodiments includes one or more elements to perform these functions, for example, frequency selectors, signal selectors, band-limiters, channel selectors, filters, downconverters, demodulators, error correctors, and demultiplexers.
  • the RF portion can include a tuner that performs various of these functions, including, for example, downconverting the received signal to a lower frequency (for example, an intermediate frequency or a near-baseband frequency) or to baseband.
  • the RF portion and its associated input processing element receives an RF signal transmitted over a wired (for example, cable) medium, and performs frequency selection by filtering, downconverting, and filtering again to a desired frequency band.
  • Adding elements can include inserting elements in between existing elements, such as, for example, inserting amplifiers and an analog-to-digital converter.
  • the RF portion includes an antenna.
  • USB and/or HDMI terminals can include respective interface processors for connecting system 1000 to other electronic devices across USB and/or HDMI connections.
  • various aspects of input processing for example, Reed-Solomon error correction
  • aspects of USB or HDMI interface processing can be implemented within separate interface ICs or within processor 1010 as necessary.
  • the demodulated, error corrected, and demultiplexed stream is provided to various processing elements, including, for example, processor 1010, and encoder/decoder 1030 operating in combination with the memory and storage elements to process the datastream as necessary for presentation on an output device.
  • connection arrangement 1 140 for example, an internal bus as known in the art, including the Inter-IC (I2C) bus, wiring, and printed circuit boards.
  • I2C Inter-IC
  • the system 1000 includes communication interface 1050 that enables communication with other devices via communication channel 1060.
  • the communication interface 1050 can include, but is not limited to, a transceiver configured to transmit and to receive data over communication channel 1060.
  • the communication interface 1050 can include, but is not limited to, a modem or network card and the communication channel 1060 can be implemented, for example, within a wired and/or a wireless medium.
  • Wi-Fi Wireless Fidelity
  • IEEE 802.1 1 IEEE refers to the Institute of Electrical and Electronics Engineers
  • the Wi-Fi signal of these embodiments is received over the communications channel 1060 and the communications interface 1050 which are adapted for Wi-Fi communications.
  • the communications channel 1060 of these embodiments is typically connected to an access point or router that provides access to external networks including the Internet for allowing streaming applications and other over- the-top communications.
  • Other embodiments provide streamed data to the system 1000 using a set-top box that delivers the data over the HDMI connection of the input block 1 130.
  • Still other embodiments provide streamed data to the system 1000 using the RF connection of the input block 1 130.
  • various embodiments provide data in a non-streaming manner.
  • various embodiments use wireless networks other than Wi-Fi, for example a cellular network or a Bluetooth network.
  • the system 1000 can provide an output signal to various output devices, including a display 1100, speakers 1 1 10, and other peripheral devices 1 120.
  • the display 1 100 of various embodiments includes one or more of, for example, a touchscreen display, an organic light- emitting diode (OLED) display, a curved display, and/or a foldable display.
  • the display 1 100 can be for a television, a tablet, a laptop, a cell phone (mobile phone), or other device.
  • the display 1 100 can also be integrated with other components (for example, as in a smart phone), or separate (for example, an external monitor for a laptop).
  • the other peripheral devices 1 120 include, in various examples of embodiments, one or more of a stand-alone digital video disc (or digital versatile disc) (DVR, for both terms), a disk player, a stereo system, and/or a lighting system.
  • Various embodiments use one or more peripheral devices 1 120 that provide a function based on the output of the system 1000. For example, a disk player performs the function of playing the output of the system 1000.
  • control signals are communicated between the system 1000 and the display 1 100, speakers 1 1 10, or other peripheral devices 1 120 using signaling such as AV.Link, Consumer Electronics Control (CEC), or other communications protocols that enable device-to-device control with or without user intervention.
  • the output devices can be communicatively coupled to system 1000 via dedicated connections through respective interfaces 1070, 1080, and 1090. Alternatively, the output devices can be connected to system 1000 using the communications channel 1060 via the communications interface 1050.
  • the display 1 100 and speakers 11 10 can be integrated in a single unit with the other components of system 1000 in an electronic device such as, for example, a television.
  • the display interface 1070 includes a display driver, such as, for example, a timing controller (T Con) chip.
  • the display 1 100 and speaker 1 1 10 can alternatively be separate from one or more of the other components, for example, if the RF portion of input 1130 is part of a separate set-top box.
  • the output signal can be provided via dedicated output connections, including, for example, HDMI ports, USB ports, or COMP outputs.
  • the embodiments can be carried out by computer software implemented by the processor 1010 or by hardware, or by a combination of hardware and software. As a non-limiting example, the embodiments can be implemented by one or more integrated circuits.
  • the memory 1020 can be of any type appropriate to the technical environment and can be implemented using any appropriate data storage technology, such as optical memory devices, magnetic memory devices, semiconductor-based memory devices, fixed memory, and removable memory, as non-limiting examples.
  • the processor 1010 can be of any type appropriate to the technical environment, and can encompass one or more of microprocessors, general purpose computers, special purpose computers, and processors based on a multi-core architecture, as non-limiting examples.
  • Various implementations involve decoding.
  • Decoding can encompass all or part of the processes performed, for example, on a received encoded sequence in order to produce a final output suitable for display.
  • processes include one or more of the processes typically performed by a decoder, for example, entropy decoding, inverse quantization, inverse transformation, and differential decoding.
  • processes also, or alternatively, include processes performed by a decoder of various implementations described in this application, for example, selecting, based on the at least one syntax element, the selection of transform methods for ISP and SBT.
  • decoding refers only to entropy decoding
  • decoding refers only to differential decoding
  • decoding refers to a combination of entropy decoding and differential decoding.
  • encoding can encompass all or part of the processes performed, for example, on an input video sequence in order to produce an encoded bitstream.
  • processes include one or more of the processes typically performed by an encoder, for example, partitioning, differential encoding, transformation, quantization, and entropy encoding.
  • processes also, or alternatively, include processes performed by an encoder of various implementations described in this application, for example, selecting, based on the at least one syntax element, the selection of transform methods for ISP and SBT.
  • encoding refers only to entropy encoding
  • encoding refers only to differential encoding
  • encoding refers to a combination of differential encoding and entropy encoding.
  • syntax elements as used herein, for example, dst7_dct8_allowed, mts_enabled_flag , intra_dst7_dct8_allowed, inter_dst7_dct8_allowed are descriptive terms. As such, they do not preclude the use of other syntax element names.
  • the implementations and aspects described herein can be implemented in, for example, a method or a process, an apparatus, a software program, a data stream, or a signal. Even if only discussed in the context of a single form of implementation (for example, discussed only as a method), the implementation of features discussed can also be implemented in other forms (for example, an apparatus or program).
  • An apparatus can be implemented in, for example, appropriate hardware, software, and firmware.
  • the methods can be implemented in, for example, a processor, which refers to processing devices in general, including, for example, a computer, a microprocessor, an integrated circuit, or a programmable logic device. Processors also include communication devices, such as, for example, computers, cell phones, portable/personal digital assistants ("PDAs”), and other devices that facilitate communication of information between end-users.
  • PDAs portable/personal digital assistants
  • references to “one embodiment” or “an embodiment” or “one implementation” or “an implementation”, as well as other variations thereof, means that a particular feature, structure, characteristic, and so forth described in connection with the embodiment is included in at least one embodiment.
  • the appearances of the phrase “in one embodiment” or“in an embodiment” or “in one implementation” or “in an implementation”, as well any other variations, appearing in various places throughout this application are not necessarily all referring to the same embodiment.
  • Determining the information can include one or more of, for example, estimating the information, calculating the information, predicting the information, or retrieving the information from memory.
  • Accessing the information can include one or more of, for example, receiving the information, retrieving the information (for example, from memory), storing the information, moving the information, copying the information, calculating the information, determining the information, predicting the information, or estimating the information.
  • this application may refer to“receiving” various pieces of information.
  • Receiving is, as with“accessing”, intended to be a broad term.
  • Receiving the information can include one or more of, for example, accessing the information, or retrieving the information (for example, from memory).
  • “receiving” is typically involved, in one way or another, during operations such as, for example, storing the information, processing the information, transmitting the information, moving the information, copying the information, erasing the information, calculating the information, determining the information, predicting the information, or estimating the information.
  • any of the following 7 “and/or”, and“at least one of, for example, in the cases of“A/B”,“A and/or B” and“at least one of A and B”, is intended to encompass the selection of the first listed option (A) only, or the selection of the second listed option (B) only, or the selection of both options (A and B).
  • such phrasing is intended to encompass the selection of the first listed option (A) only, or the selection of the second listed option (B) only, or the selection of the third listed option (C) only, or the selection of the first and the second listed options (A and B) only, or the selection of the first and third listed options (A and C) only, or the selection of the second and third listed options (B and C) only, or the selection of all three options (A and B and C).
  • This may be extended, as is clear to one of ordinary skill in this and related arts, for as many items as are listed.
  • the word“signal” refers to, among other things, indicating something to a corresponding decoder.
  • the encoder signals a particular one of a plurality of parameters for of DCT8 and DST7 enabling.
  • the same parameter is used at both the encoder side and the decoder side.
  • an encoder can transmit (explicit signaling) a particular parameter to the decoder so that the decoder can use the same particular parameter.
  • signaling can be used without transmitting (implicit signaling) to simply allow the decoder to know and select the particular parameter.
  • signaling can be accomplished in a variety of ways. For example, one or more syntax elements, flags, and so forth are used to signal information to a corresponding decoder in various embodiments. While the preceding relates to the verb form of the word“signal”, the word“signal” can also be used herein as a noun.
  • implementations can produce a variety of signals formatted to carry information that can be, for example, stored or transmitted.
  • the information can include, for example, instructions for performing a method, or data produced by one of the described implementations.
  • a signal can be formatted to carry the bitstream of a described embodiment.
  • Such a signal can be formatted, for example, as an electromagnetic wave (for example, using a radio frequency portion of spectrum) or as a baseband signal.
  • the formatting can include, for example, encoding a data stream and modulating a carrier with the encoded data stream.
  • the information that the signal carries can be, for example, analog or digital information.
  • the signal can be transmitted over a variety of different wired or wireless links, as is known.
  • the signal can be stored on a processor- readable medium.
  • embodiments can be provided alone or in any combination, across various claim categories and types. Further, embodiments can include one or more of the following features, devices, or aspects, alone or in any combination, across various claim categories and types:
  • o determine the use of non-separable secondary transform for the current CU, according to the primary transform related information associated to the CU and according to some cbf (coded block flag, i.e. non-zero residual block or subblock) information associated to the coding unit.
  • cbf coded block flag, i.e. non-zero residual block or subblock
  • decoding an image block using ISP and/or SBT according to any of the embodiments described, and that displays (e.g. using a monitor, screen, or other type of display) a resulting image.
  • a TV, set-top box, cell phone, tablet, or other electronic device that selects (e.g. using a tuner) a channel to receive a signal including an encoded image, and performs decoding at least an image block using ISP and/or SBT according to any of the embodiments described.
  • a TV, set-top box, cell phone, tablet, or other electronic device that receives (e.g. using an antenna) a signal over the air that includes an encoded image, and performs decoding at least an image block using ISP and/or SBT according to any of the embodiments described.

Abstract

L'invention concerne différents modes de réalisation, en particulier des modes de réalisation de codage et de décodage vidéo. À cet effet, le codage ou le décodage consiste à obtenir au moins un élément de syntaxe lié à l'activation d'une sélection de transformée multiple (MTS) et, d'après l'élément ou les éléments de syntaxe, à obtenir une transformée horizontale ou une transformée verticale utilisée dans un procédé de transformée à appliquer à un bloc de résidu. Selon une caractéristique particulière, dans un sous-partitionnement intra (ISP) ou une transformée de sous-bloc (SBT), la transformée horizontale et la transformée verticale d'un procédé de transformation sont définies sur la transformée de noyau DCT2 dans le cas où l'élément ou les éléments de syntaxe désactivent la sélection de transformée multiple. Selon un autre mode de réalisation, l'invention concerne également la commande de l'utilisation d'une transformée secondaire non séparable.
PCT/US2020/039088 2019-06-24 2020-06-23 Syntaxe de haut niveau pour commander la conception de transformée WO2020263799A1 (fr)

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