WO2020211807A1 - Matrix derivation in intra coding mode - Google Patents

Matrix derivation in intra coding mode Download PDF

Info

Publication number
WO2020211807A1
WO2020211807A1 PCT/CN2020/085050 CN2020085050W WO2020211807A1 WO 2020211807 A1 WO2020211807 A1 WO 2020211807A1 CN 2020085050 W CN2020085050 W CN 2020085050W WO 2020211807 A1 WO2020211807 A1 WO 2020211807A1
Authority
WO
WIPO (PCT)
Prior art keywords
block
samples
current video
mode
sub
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2020/085050
Other languages
English (en)
French (fr)
Inventor
Zhipin DENG
Kai Zhang
Li Zhang
Hongbin Liu
Jizheng Xu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing ByteDance Network Technology Co Ltd
ByteDance Inc
Original Assignee
Beijing ByteDance Network Technology Co Ltd
ByteDance Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2021560955A priority Critical patent/JP7403555B2/ja
Priority to KR1020217032310A priority patent/KR102744182B1/ko
Priority to EP20791054.8A priority patent/EP3939270A4/en
Priority to CN202311457029.8A priority patent/CN117499656A/zh
Priority to CN202080028965.5A priority patent/CN113748676B/zh
Application filed by Beijing ByteDance Network Technology Co Ltd, ByteDance Inc filed Critical Beijing ByteDance Network Technology Co Ltd
Publication of WO2020211807A1 publication Critical patent/WO2020211807A1/en
Priority to US17/399,879 priority patent/US11457207B2/en
Anticipated expiration legal-status Critical
Priority to US17/895,511 priority patent/US12375643B2/en
Priority to JP2023150924A priority patent/JP7612795B2/ja
Priority to US18/502,636 priority patent/US12610037B2/en
Ceased legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/105—Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for 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
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/11—Selection of coding mode or of prediction mode among a plurality of spatial predictive coding modes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/132—Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
    • 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
    • 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
    • H04N19/169—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
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/18—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a set of transform coefficients
    • H—ELECTRICITY
    • 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
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
    • 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

  • This patent document relates to video coding techniques, devices and systems.
  • Devices, systems and methods related to digital video coding, and specifically, matrix-based intra prediction methods for video coding are described.
  • the described methods may be applied to both the existing video coding standards (e.g., High Efficiency Video Coding (HEVC) ) and future video coding standards (e.g., Versatile Video Coding (VVC) ) or codecs.
  • HEVC High Efficiency Video Coding
  • VVC Versatile Video Coding
  • a first example method of video processing includes performing a conversion between a current video block of a video and a bitstream representation of the current video block according to a rule, where the rule specifies a relationship between samples of the current video block and matrices or offset values applied in a matrix weighted intra prediction (MIP) mode during the conversion, and where the MIP mode includes determining a prediction block of the current video block by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation.
  • MIP matrix weighted intra prediction
  • a second example method of video processing includes generating, for a current video block, an intermediate prediction block using a matrix weighted intra prediction (MIP) mode in which the intermediate prediction block of the current video block is determined by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation; generating, based on the intermediate prediction block, a final prediction block based on an additional operation; and performing, based on the final prediction signal, a conversion between the current video block and a bitstream representation of the current video block.
  • MIP matrix weighted intra prediction
  • a third example method of video processing includes performing a conversion between a current video block of a video and a bitstream representation of the current video block, where the conversion includes predicting a plurality of samples of at least a portion of the current video block in a matrix weighted intra prediction (MIP) mode in which a prediction block of the portion of current video block is determined by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation.
  • MIP matrix weighted intra prediction
  • a fourth example method of video processing includes performing a conversion between a current video block of a video and a bitstream representation of the current video block, where the conversion is based on a rule that indicates whether to filter neighboring samples of the current video block prior to applying the matrix weighted intra prediction (MIP) mode during the conversion, and where the MIP mode includes determining a prediction block of the current video block by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation.
  • MIP matrix weighted intra prediction
  • the disclosed technology may be used to provide a method for video processing.
  • This exemplary method includes determining that a current video block is coded using an affine linear weighted intra prediction (ALWIP) mode, constructing, based on the determining, at least a portion of a most probable mode (MPM) list for the ALWIP mode based on an at least a portion of an MPM list for a non-ALWIP intra mode, and performing, based on the MPM list for the ALWIP mode, a conversion between the current video block and a bitstream representation of the current video block.
  • AWA affine linear weighted intra prediction
  • MPM most probable mode
  • the disclosed technology may be used to provide a method for video processing.
  • This exemplary method includes determining that a luma component of a current video block is coded using an affine linear weighted intra prediction (ALWIP) mode, inferring, based on the determining, a chroma intra mode, and performing, based on the chroma intra mode, a conversion between the current video block and a bitstream representation of the current video block.
  • AWIP affine linear weighted intra prediction
  • the disclosed technology may be used to provide a method for video processing.
  • This exemplary method includes determining that a current video block is coded using an affine linear weighted intra prediction (ALWIP) mode, and performing, based on the determining, a conversion between the current video block and a bitstream representation of the current video block.
  • AWIP affine linear weighted intra prediction
  • the disclosed technology may be used to provide a method for video processing.
  • This exemplary method includes determining that a current video block is coded using a coding mode different from an affine linear weighted intra prediction (ALWIP) mode, and performing, based on the determining, a conversion between the current video block and a bitstream representation of the current video block.
  • AWIP affine linear weighted intra prediction
  • the disclosed technology may be used to provide a method for video processing.
  • This exemplary method includes generating, for a current video block, a first prediction using an affine linear weighted intra prediction (ALWIP) mode, generating, based on the first prediction, a second prediction using position dependent intra prediction combination (PDPC) , and performing, based on the second prediction, a conversion between the current video block and a bitstream representation of the current video block.
  • AWIP affine linear weighted intra prediction
  • PDPC position dependent intra prediction combination
  • the disclosed technology may be used to provide a method for video processing.
  • This exemplary method includes determining that a current video block is coded using an affine linear weighted intra prediction (ALWIP) mode, predicting, based on the ALWIP mode, a plurality of sub-blocks of the current video block, and performing, based on the predicting, a conversion between the current video block and a bitstream representation of the current video block.
  • ALWIP affine linear weighted intra prediction
  • the above-described method is embodied in the form of processor-executable code and stored in a computer-readable program medium.
  • a device that is configured or operable to perform the above-described method.
  • the device may include a processor that is programmed to implement this method.
  • a video decoder apparatus may implement a method as described herein.
  • FIG. 1 shows an example of 33 intra prediction directions.
  • FIG. 2 shows an example of 67 intra prediction modes.
  • FIG. 3 shows an example of locations of samples used for the derivation of the weights of the linear model.
  • FIG. 4 shows an example of four reference lines neighboring a prediction block.
  • FIG. 5A and FIG. 5B show examples of sub-partitions depending on block size.
  • FIG. 6 shows an example of ALWIP for 4 ⁇ 4 blocks.
  • FIG. 7 shows an example of ALWIP for 8 ⁇ 8 blocks.
  • FIG. 8 shows an example of ALWIP for 8 ⁇ 4 blocks.
  • FIG. 9 shows an example of ALWIP for 16 ⁇ 16 blocks.
  • FIG. 10 shows an example of neighboring blocks using in MPM list construction.
  • FIG. 11 shows a flowchart of an example method for matrix-based intra prediction, in accordance with the disclosed technology.
  • FIG. 12 shows a flowchart of another example method for matrix-based intra prediction, in accordance with the disclosed technology.
  • FIG. 13 shows a flowchart of yet another example method for matrix-based intra prediction, in accordance with the disclosed technology.
  • FIG. 14 shows a flowchart of yet another example method for matrix-based intra prediction, in accordance with the disclosed technology.
  • FIG. 15 is a block diagram of an example of a hardware platform for implementing a visual media decoding or a visual media encoding technique described in the present document.
  • FIG. 16 is a block diagram showing an example video processing system in which various techniques disclosed herein may be implemented.
  • FIG. 17 is a block diagram that illustrates an example video coding system that may utilize the techniques of this disclosure.
  • FIG. 18 is a block diagram illustrating an example of video encoder.
  • FIG. 19 is a block diagram illustrating an example of video decoder.
  • FIGS. 20-23 show example flowcharts of additional example methods for matrix-based intra prediction, in accordance with the disclosed technology.
  • Video codecs typically include an electronic circuit or software that compresses or decompresses digital video, and are continually being improved to provide higher coding efficiency.
  • a video codec converts uncompressed video to a compressed format or vice versa.
  • the compressed format usually conforms to a standard video compression specification, e.g., the High Efficiency Video Coding (HEVC) standard (also known as H. 265 or MPEG-H Part 2) , the Versatile Video Coding (VVC) standard to be finalized, or other current and/or future video coding standards.
  • HEVC High Efficiency Video Coding
  • VVC Versatile Video Coding
  • Embodiments of the disclosed technology may be applied to existing video coding standards (e.g., HEVC, H. 265) and future standards to improve runtime performance.
  • Section headings are used in the present document to improve readability of the description and do not in any way limit the discussion or the embodiments (and/or implementations) to the respective sections only.
  • Intra prediction involves producing samples for a given TB (transform block) using samples previously reconstructed in the considered color channel.
  • the intra prediction mode is separately signaled for the luma and chroma channels, with the chroma channel intra prediction mode optionally dependent on the luma channel intra prediction mode via the ‘DM_CHROMA’ mode.
  • the intra prediction mode is signaled at the PB (prediction block) level, the intra prediction process is applied at the TB level, in accordance with the residual quad-tree hierarchy for the CU, thereby allowing the coding of one TB to have an effect on the coding of the next TB within the CU, and therefore reducing the distance to the samples used as reference values.
  • HEVC includes 35 intra prediction modes –a DC mode, a planar mode and 33 directional, or ‘angular’ intra prediction modes.
  • the 33 angular intra prediction modes are illustrated in FIG. 1.
  • the intra prediction mode is specified as either planar, DC, horizontal, vertical, ‘DM_CHROMA’ mode or sometimes diagonal mode ‘34’ .
  • the chroma PB may overlap two or four (respectively) luma PBs; in this case the luma direction for DM_CHROMA is taken from the top left of these luma PBs.
  • the DM_CHROMA mode indicates that the intra prediction mode of the luma color channel PB is applied to the chroma color channel PBs. Since this is relatively common, the most-probable-mode coding scheme of the intra_chroma_pred_mode is biased in favor of this mode being selected.
  • the number of directional intra modes is extended from 33, as used in HEVC, to 65.
  • the additional directional modes are depicted as red dotted arrows in FIG. 2, and the planar and DC modes remain the same.
  • These denser directional intra prediction modes apply for all block sizes and for both luma and chroma intra predictions.
  • CCLM cross-component linear model
  • LM cross-component linear model
  • pred C (i, j) represents the predicted chroma samples in a CU and rec L ′ (i, j) represents the downsampled reconstructed luma samples of the same CU.
  • Linear model parameter ⁇ and ⁇ are derived from the relation between luma values and chroma values from two samples, which are luma sample with minimum sample value and with maximum sample inside the set of downsampled neighboring luma samples, and their corresponding chroma samples.
  • FIG. 3 shows an example of the location of the left and above samples and the sample of the current block involved in the CCLM mode.
  • This parameter computation is performed as part of the decoding process, and is not just as an encoder search operation. As a result, no syntax is used to convey the ⁇ and ⁇ values to the decoder.
  • Chroma mode coding directly depends on the intra prediction mode of the corresponding luma block. Since separate block partitioning structure for luma and chroma components is enabled in I slices, one chroma block may correspond to multiple luma blocks. Therefore, for Chroma DM mode, the intra prediction mode of the corresponding luma block covering the center position of the current chroma block is directly inherited.
  • Multiple reference line (MRL) intra prediction uses more reference lines for intra prediction.
  • FIG. 4 an example of 4 reference lines is depicted, where the samples of segments A and F are not fetched from reconstructed neighboring samples but padded with the closest samples from Segment B and E, respectively.
  • HEVC intra-picture prediction uses the nearest reference line (i.e., reference line 0) .
  • reference line 0 the nearest reference line
  • 2 additional lines reference line 1 and reference line 3
  • the index of selected reference line (mrl_idx) is signalled and used to generate intra predictor.
  • reference line idx which is greater than 0, only include additional reference line modes in MPM list and only signal mpm index without remaining mode.
  • ISP Intra sub-partitions
  • the Intra Sub-Partitions (ISP) tool divides luma intra-predicted blocks vertically or horizontally into 2 or 4 sub-partitions depending on the block size. For example, minimum block size for ISP is 4x8 (or 8x4) . If block size is greater than 4x8 (or 8x4) then the corresponding block is divided by 4 sub-partitions. FIG. 5 shows examples of the two possibilities. All sub-partitions fulfill the condition of having at least 16 samples.
  • reconstructed samples are obtained by adding the residual signal to the prediction signal.
  • a residual signal is generated by the processes such as entropy decoding, inverse quantization and inverse transform. Therefore, the reconstructed sample values of each sub-partition are available to generate the prediction of the next sub-partition, and each sub-partition is processed repeatedly.
  • the first sub-partition to be processed is the one containing the top-left sample of the CU and then continuing downwards (horizontal split) or rightwards (vertical split) .
  • reference samples used to generate the sub-partitions prediction signals are only located at the left and above sides of the lines. All sub-partitions share the same intra mode.
  • Affine linear weighted intra prediction (ALWIP, a.k.a. Matrix based intra prediction (MIP) ) is proposed in JVET-N0217.
  • test 1 ALWIP is designed with a memory restriction of 8K bytes and at most 4 multiplications per sample.
  • Test 2 is similar to test 1, but further simplifies the design in terms of memory requirement and model architecture.
  • affine linear weighted intra prediction takes one line of H reconstructed neighboring boundary samples left of the block and one line of W reconstructed neighboring boundary samples above the block as input. If the reconstructed samples are unavailable, they are generated as it is done in the conventional intra prediction.
  • the generation of the prediction signal is based on the following three steps:
  • a matrix vector multiplication, followed by addition of an offset, is carried out with the averaged samples as an input.
  • the result is a reduced prediction signal on a subsampled set of samples in the original block.
  • the prediction signal at the remaining positions is generated from the prediction signal on the subsampled set by linear interpolation which is a single step linear interpolation in each direction.
  • the matrices and offset vectors needed to generate the prediction signal are taken from three sets S 0 , S 1 , S 2 of matrices.
  • the set S 0 consists of 18 matrices each of which has 16 rows and 4 columns and 18 offset vectors each of size 16. Matrices and offset vectors of that set are used for blocks of size 4 ⁇ 4.
  • the set S 1 consists of 10 matrices each of which has 16 rows and 8 columns and 10 offset vectors each of size 16. Matrices and offset vectors of that set are used for blocks of sizes 4 ⁇ 8, 8 ⁇ 4 and 8 ⁇ 8.
  • the set S 2 consists of 6 matrices each of which has 64 rows and 8 columns and of 6 offset vectors of size 64. Matrices and offset vectors of that set or parts of these matrices and offset vectors are used for all other block-shapes.
  • the total number of multiplications needed in the computation of the matrix vector product is always smaller than or equal to 4 ⁇ W ⁇ H. In other words, at most four multiplications per sample are required for the ALWIP modes.
  • the input boundaries bdry top and bdry left are reduced to smaller boundaries and Here, and both consists of 2 samples in the case of a 4 ⁇ 4-block and both consist of 4 samples in all other cases.
  • W red and H red are defined as:
  • the reduced prediction signal pred red is computed by calculating a matrix vector product and adding an offset:
  • b is a vector of size W red ⁇ H red .
  • the matrix A and the vector b are taken from one of the sets S 0 , S 1 , S 2 as follows.
  • One defines an index idx idx (W, H) as follows:
  • FIGS. 6-9. The entire process of averaging, matrix vector multiplication and linear interpolation is illustrated for different shapes in FIGS. 6-9. Note, that the remaining shapes are treated as in one of the depicted cases.
  • ALWIP takes four averages along the horizontal axis of the boundary and the four original boundary values on the left boundary.
  • the resulting eight input samples enter the matrix vector multiplication.
  • the matrices are taken from the set S 1 . This yields 16 samples on the odd horizontal and each vertical positions of the prediction block.
  • ALWIP takes four averages along each axis of the boundary.
  • the resulting eight input samples enter the matrix vector multiplication.
  • the matrices are taken from the set S 2 . This yields 64 samples on the odd positions of the prediction block.
  • these samples are interpolated vertically by using eight averages of the top boundary. Horizontal interpolation follows by using the original left boundary. The interpolation process, in this case, does not add any multiplications. Therefore, totally, two multiplications per sample are required to calculate ALWIP prediction.
  • the procedure is essentially the same and it is easy to check that the number of multiplications per sample is less than four.
  • the transposed cases are treated accordingly.
  • the prediction signal arises from the reduced prediction signal pred red on W red ⁇ H red by linear interpolation.
  • linear interpolation is done in vertical, horizontal or both directions. If linear interpolation is to be applied in both directions, it is first applied in horizontal direction if W ⁇ H and it is first applied in vertical direction, else.
  • a flag indicating if an ALWIP mode is to be applied on the corresponding Prediction Unit (PU) or not is sent in the bitstream.
  • the signalization of the latter index is harmonized with MRL in the same way as in JVET-M0043. If an ALWIP mode is to be applied, the index predmode of the ALWIP mode is signaled using a MPM-list with 3 MPMS.
  • the derivation of the MPMs is performed using the intra-modes of the above and the left PU as follows.
  • predmode ALWIP map_angular_to_alwip idx [predmode Angular ] .
  • idx (PU) idx (W, H) ⁇ ⁇ 0, 1, 2 ⁇
  • the above PU belongs to the same CTU as the current PU and is in intra mode and if a conventional intra prediction mode is applied on the above PU, one puts
  • the left neighboring block and above neighboring block used in the ALWIP MPM list construction is A1 and B1 as shown in FIG. 10.
  • the proposed ALWIP-modes are harmonized with the MPM-based coding of the conventional intra-prediction modes as follows.
  • the luma and chroma MPM-list derivation processes for the conventional intra-prediction modes uses fixed tables map_alwip_to_angular idx , idx ⁇ ⁇ 0, 1, 2 ⁇ , mapping an ALWIP-mode predmode ALWIP on a given PU to one of the conventional intra-prediction modes
  • predmode Angular map_alwip_to_angular idx (PU) [predmode ALWIP ]
  • portions related to intra_lwip_flag, intra_lwip_mpm_flag, intra_lwip_mpm_idx and intra_lwip_mpm_remainder have been added to the working draft based on embodiments of the disclosed technology.
  • the ⁇ begin>and ⁇ end>tags are used to denote additions and modifications to the working draft based on embodiments of the disclosed technology.
  • intra_lwip_flag [x0] [y0] 1 specifies that the intra prediction type for luma samples is affine linear weighted intra prediction.
  • intra_lwip_flag [x0] [y0] 0 specifies that the intra prediction type for luma samples is not affine linear weighted intra prediction.
  • intra_lwip_mpm_flag [x0] [y0] , intra_lwip_mpm_idx [x0] [y0] and intra_lwip_mpm_remainder [x0] [y0] specify the affine linear weighted intra prediction mode for luma samples.
  • the array indices x0, y0 specify the location (x0, y0) of the top-left luma sample of the considered coding block relative to the top-left luma sample of the picture.
  • intra_lwip_mpm_flag [x0] [y0] is equal to 1
  • the affine linear weighted intra prediction mode is inferred from a neighboring intra-predicted coding unit according to clause 8.4.
  • intra_subpartitions_split_flag [x0] [y0] specifies whether the intra subpartitions split type is horizontal or vertical. When intra_subpartitions_split_flag [x0] [y0] is not present, it is inferred as follows:
  • intra_lwip_flag [x0] [y0] is equal to 1
  • intra_subpartitions_split_flag [x0] [y0] is inferred to be equal to 0.
  • intra_subpartitions_split_flag [x0] [y0] is inferred to be equal to 0.
  • intra_subpartitions_split_flag [x0] [y0] is inferred to be equal to 1.
  • a luma location (xCb, yCb) specifying the top-left sample of the current coding block relative to the top-left luma sample of the current picture
  • variable cbWidth specifying the width of the current coding block in luma samples
  • variable cbHeight specifying the height of the current coding block in luma samples
  • variable treeType specifying whether a single or a dual tree is used and if a dual tree is used, it specifies whether the current tree corresponds to the luma or chroma components.
  • Output of this process is a modified reconstructed picture before in-loop filtering.
  • the derivation process for quantization parameters as specified in clause 8.7.1 is invoked with the luma location (xCb, yCb) , the width of the current coding block in luma samples cbWidth and the height of the current coding block in luma samples cbHeight, and the variable treeType as inputs.
  • the luma intra prediction mode is derived asfollows:
  • intra_lwip_flag [xCb] [yCb] is equal to 1, the derivation process for the affine linear weighted intra prediction mode as specified in clause 8.4.
  • X is invoked with the luma location (xCb, yCb) , the width of the current coding block in luma samples cbWidth and the height of the current coding block in luma samples cbHeight as input.
  • the derivation process for the luma intra prediction mode as specified in clause 8.4.2 is invoked with the luma location (xCb, yCb) , the width of the current coding block in luma samples cbWidth and the height of the current coding block in luma samples cbHeight as input.
  • the general decoding process for intra blocks as specified in clause 8.4.4.1 is invoked with the luma location (xCb, yCb) , the tree type treeType, the variable nTbW set equal to cbWidth, the variable nTbH set equal to cbHeight, the variable predModeIntra set equal to IntraPredModeY [xCb] [yCb] , and the variable cIdx set equal to 0 as inputs, and the output is a modified reconstructed picture before in-loop filtering.
  • a luma location (xCb, yCb) specifying the top-left sample of the current luma coding block relative to the top-left luma sample of the current picture
  • variable cbWidth specifying the width of the current coding block in luma samples
  • variable cbHeight specifying the height of the current coding block in luma samples.
  • IntraPredModeY [xCb] [yCb] is derived by the following ordered steps:
  • the neighboring locations (xNbA, yNbA) and (xNbB, yNbB) are set equal to (xCb-1, yCb) and (xCb, yCb-1) , respectively.
  • X (Ed. (BB) : Neighboring blocks availability checking process tbd] is invoked with the location (xCurr, yCurr) set equal to (xCb, yCb) and the neighboring location (xNbY, yNbY) set equal to (xNbX, yNbX) as inputs, and the output is assigned to availableX.
  • the candidate affine linear weighted intra prediction mode candLwipModeX is derived as follows:
  • candLwipModeX is set equal to -1.
  • variable availableX is equal to FALSE.
  • CuPredMode [xNbX] [yNbX] is not equal to MODE_INTRA and mh_intra_flag [xNbX] [yNbX] is not equal to 1.
  • X is equal to B and yCb-1 is less than ( (yCb>>CtbLog2SizeY) ⁇ CtbLog2SizeY) .
  • X. 1 is invoked with the width of the current coding block in luma samples cb Width and the height of the current coding block in luma samples cbHeight as input, and the output is assigned to variable sizeId.
  • X. 1 is invoked with the width of the neighboring coding block in luma samples nbWidthX and the height of the neighboring coding block in luma samples nbHeightXas input, and the output is assigned to variable sizeIdX.
  • candLwipModeX is set equal to IntraPredModeY [xNbX] [yNbX] .
  • candLwipModeX is derived using IntraPredModeY [xNbX] [yNbX] and sizeId as specified in Table 8-X1.
  • IntraPredModeY [xCb] [yCb] is derived by applying the following procedure:
  • IntraPredModeY [xCb] [yCb] is set equal to candLwipModeList [intra_lwip_mpm_idx [xCb] [yCb] ] .
  • IntraPredModeY [xCb] [yCb] is derived by applying the following ordered steps:
  • IntraPredModeY [xCb] [yCb] is derived by the following ordered steps:
  • IntraPredModeY [xCb] [yCb] is set equal to intra_lwip_mpm_remainder [xCb] [yCb] .
  • IntraPredModeY [xCb] [yCb] is greater than or equal to candLwipModeList [i] , the value of IntraPredModeY [xCb] [yCb] is incremented by one.
  • variable cbWidth specifying the width of the current coding block in luma samples
  • variable cbHeight specifying the height of the current coding block in luma samples.
  • Output of this process is a variable sizeId.
  • variable sizeId is derived as follows:
  • sizeId is set equal to 0.
  • sizeId is set equal to 1.
  • sizeId is set equal to 2.
  • a luma location (xCb, yCb) specifying the top-left sample of the current luma coding block relative to the top-left luma sample of the current picture
  • variable cbWidth specifying the width of the current coding block in luma samples
  • variable cbHeight specifying the height of the current coding block in luma samples.
  • Table 8-1 specifies the value for the intra prediction mode IntraPredModeY [xCb] [yCb] and the associated names.
  • IntraPredModeY [xCb] [yCb] is derived by the following ordered steps:
  • the neighboring locations (xNbA, yNbA) and (xNbB, yNbB) are set equal to (xCb-1, yCb+cbHeight-1) and (xCb+cbWidth-1, yCb-1) , respectively.
  • the candidate intra prediction mode candIntraPredModeX is derived as follows:
  • candIntraPredModeX is set equal to INTRA_PLANAR.
  • variable availableX is equal to FALSE.
  • CuPredMode [xNbX] [yNbX] is not equal to MODE_INTRA and ciip_flag [xNbX] [yNbX] is not equal to 1.
  • X is equal to B and yCb-1 is less than ( (yCb>>CtbLog2SizeY) ⁇ CtbLog2SizeY) .
  • candIntraPredModeX is derived as follows:
  • X. 1 is invoked with the width of the current coding block in luma samples cbWidth and the height of the current coding block in luma samples cbHeight as input, and the output is assigned to variable sizeId.
  • candIntraPredModeX is derived using IntraPredModeY [xNbX] [yNbX] and sizeId as specified in Table 8-X3.
  • candIntraPredModeX is set equal to IntraPredModeY [xNbX] [yNbX] .
  • ispDefaultMode1 and ispDefaultMode2 are defined as follows:
  • IntraSubPartitionsSplitType is equal to ISP_HOR_SPLIT
  • ispDefaultMode1 is set equal to INTRA_ANGULAR18
  • ispDefaultMode2 is set equal to INTRA_ANGULAR5.
  • ispDefaultMode1 is set equal to INTRA_ANGULAR50 and ispDefaultMode2 is set equal to INTRA_ANGULAR63.
  • a luma location (xCb, yCb) specifying the top-left sample of the current chroma coding block relative to the top-left luma sample of the current picture
  • variable cbWidth specifying the width of the current coding block in luma samples
  • variable cbHeight specifying the height of the current coding block in luma samples.
  • the corresponding luma intra prediction mode lumaIntraPredMode is derived as follows:
  • lumaIntraPredMode is derived by the following ordered steps:
  • X. 1 is invoked with the width of the current coding block in luma samples cbWidth and the height of the current coding block in luma samples cbHeight as input, and the output is assigned to variable sizeId.
  • the luma intra prediction mode is derived using IntraPredModeY [xCb+cb Width/2] [yCb+cbHeight/2] and sizeId as specified in Table 8-X3 and assigning the value of candIntraPredModeX to lumaIntraPredMode.
  • lumaIntraPredMode is set equal to IntraPredModeY [xCb+cbWidth/2] [yCb+cbHeight/2] .
  • IntraPredModeC [xCb] [yCb] is derived using intra_chroma_pred_mode [xCb] [yCb] and lumaIntraPredMode as specified in Table 8-2 and Table 8-3.
  • variable cIdx specifying the colour component of the current block.
  • X1 is invoked with the location (xTbCmp, yTbCmp) , the intra prediction mode predModeIntra, the transform block width nTbW and height nTbH as inputs, and the output is predSamples.
  • nTbH specifying the transform block height
  • X. 1 is invoked with the transform block width nTbW and the transform block height nTbH as input, and the output is assigned to variable sizeId.
  • Variables numModes, boundarySize, predW, predH and predC are derived using sizeId as specified in Table 8-X4.
  • the flag isTransposed is derived as follows:
  • upsBdryW and upsBdryH are derived as follows:
  • upsBdryW (nTbH > nTbW) ? nTbW: predW (8-X18)
  • upsBdryH (nTbH > nTbW) ? predH: nTbH (8-X19)
  • the reduced top and left boundary samples redT and redL are assigned to the boundary sample array p as follows:
  • variable modeId is derived as follows:
  • variable sW is derived using sizeId and modeId as specified in Table 8-X5.
  • X4 is invoked with the input block width predW, the input block height predH, affine linear weighted samples predLwip, the transform block width nTbW, the transform block height nTbH, the upsampling boundary width upsBdryW, the upsampling boundary height upsBdryH, the top upsampling boundary samples upsBdryT, and the left upsampling boundary samples upsBdryL as inputs, and the output is the predicted sample array predSamples.
  • nTbH specifying the transform block height
  • the top and left neighboring luma locations (xNbT, yNbT) and (xNbL, yNbL) are specified by:
  • refT [x] is set equal to refT [lastT–1] .
  • refL [y] is set equal to refL [lastL–1] .
  • variable upsBdrySize specifying the boundary size for upsampling.
  • upsBdrySize is equal to nTbX
  • upsBdryX [x] is set equal to refX [x] .
  • boundarySize is less than upsBdrySize, the following applies:
  • redX [x] is set equal to upsBdryX [x] .
  • predSamples [xHor+dX] [yHor] ( (upHor-dX) *predSamples [xHor] [yHor] + dX*predSamples [xHor+upHor] [yHor] ) /upHor (8-X39)
  • predSamples [xVer] [yVer+dY] ( (upVer-dY) *predSamples [xVer] [yVer] + dY*predSamples [xVer] [yVer+upVer] ) /upVer (8-X40)
  • affine linear weighted intra prediction takes one line of H reconstructed neighboring boundary samples left of the block and one line of W reconstructed neighboring boundary samples above the block as input. If the reconstructed samples are unavailable, they are generated as it is done in the conventional intra prediction. ALWIP is only applied to luma intra block. For chroma intra block, the conventional intra coding modes are applied.
  • the generation of the prediction signal is based on the following three steps:
  • a matrix vector multiplication, followed by addition of an offset, is carried out with the averaged samples as an input.
  • the result is a reduced prediction signal on a subsampled set of samples in the original block.
  • the prediction signal at the remaining positions is generated from the prediction signal on the subsampled set by linear interpolation which is a single step linear interpolation in each direction.
  • the index predmode of the ALWIP mode is signaled using a MPM-list with 3 MPMS.
  • the derivation of the MPMs is performed using the intra-modes of the above and the left PU as follows.
  • map_angular_to_alwip idx , idx ⁇ ⁇ 0, 1, 2 ⁇ that assign to each conventional intra prediction mode predmode Angular an ALWIP mode
  • predmode ALWIP map_angular_to_alwip idx [predmode Angular ].
  • idx (PU) idx (W, H) ⁇ ⁇ 0, 1, 2 ⁇
  • the above PU belongs to the same CTU as the current PU and is in intra mode and if a conventional intra prediction mode is applied on the above PU, one puts
  • predmode Angular map_alwip_to_angular idx (PU) [predmode ALWIP ]
  • a Multiple Transform Selection (MTS) scheme is used for residual coding both inter and intra coded blocks. It uses multiple selected transforms from the DCT8/DST7.
  • the newly introduced transform matrices are DST-VII and DCT-VIII.
  • Reduced secondary transform applies 16x16 and 16x64 non-separable transform for 4x4 and 8x8 blocks, respectively.
  • Primary forward and inverse transforms are still performed the same way as two 1-D horizontal/vertical transform passes.
  • Secondary forward and inverse transforms are a separate process step from that of primary transforms.
  • primary forward transform is performed first, then followed by secondary forward transform and quantization, and CABAC bit encoding.
  • CABAC bit decoding and inverse quantization then Secondary inverse transform is performed first, then followed by primary inverse transform.
  • RST applies only to intra coded TUs in both intra slice and inter slices.
  • a unified 6-MPM list is proposed for intra blocks irrespective of whether Multiple Reference Line (MRL) and Intra sub-partition (ISP) coding tools are applied or not.
  • the MPM list is constructed based on intra modes of the left and above neighboring block as in VTM4.0. Suppose the mode of the left is denoted as Left and the mode of the above block is denoted as Above, the unified MPM list is constructed as follows:
  • MPM list ⁇ ⁇ Planar, Max, DC, Max -1, Max +1, Max -2 ⁇
  • MPM list ⁇ ⁇ Planar, Left, Above, DC, Max-1, Max +1 ⁇
  • MPM list ⁇ ⁇ Planar, Left, Above, DC, Max -2, Max +2 ⁇
  • MPM list ⁇ ⁇ Planar, Left, Left -1, Left +1, DC, Left -2 ⁇
  • the first bin of the MPM index codeword is CABAC context coded. In total three contexts are used, corresponding to whether the current intra block is MRL enabled, ISP enabled, or a normal intra block.
  • the left neighboring block and above neighboring block used in the unified MPM list construction is A2 and B2 as shown in FIG. 10.
  • One MPM flag is firstly coded. If the block is coded with one of mode in the MPM list, an MPM index is further coded. Otherwise, an index to the remaining modes (excluding MPMs) is coded.
  • ALWIP is only applied to luma component of the block.
  • a chroma mode index is coded and sent to decoder, which could result in unnecessary signaling.
  • ALWIP coded blocks are treated as normal intra-blocks.
  • Embodiments of the presently disclosed technology overcome drawbacks of existing implementations, thereby providing video coding with higher coding efficiencies but lower computational complexity.
  • Matrix-based intra prediction methods for video coding may enhance both existing and future video coding standards, is elucidated in the following examples described for various implementations.
  • the examples of the disclosed technology provided below explain general concepts, and are not meant to be interpreted as limiting. In an example, unless explicitly indicated to the contrary, the various features described in these examples may be combined.
  • an intra-prediction mode refers to an angular intra prediction mode (including DC, planar, CCLM and other possible intra prediction modes) ; while an intra mode refers to normal intra mode, or MRL, or ISP or ALWIP.
  • “Other intra modes” may refer to one or multiple intra modes except ALWIP, such as normal intra mode, or MRL, or ISP.
  • Shift (x, n) (x+ offset0) >>n.
  • offset0 and/or offset1 are set to (1 ⁇ n) >>1 or (1 ⁇ (n-1) ) . In another example, offset0 and/or offset1 are set to 0.
  • Clip3 (min, max, x) is defined as
  • the whole or partial of the MPM list for ALWIP may be constructed according to the whole or partial procedure to construct the MPM list for non-ALWIP intra mode (such as normal intra mode, MRL, or ISP) .
  • non-ALWIP intra mode such as normal intra mode, MRL, or ISP
  • the size of the MPM list for ALWIP may be the same as that of the MPM list for non-ALWIP intra mode.
  • the size of MPM list is 6 for both ALWIP and non-ALWIP intra modes.
  • the MPM list for ALWIP may be derived from the MPM list for non-ALWIP intra mode.
  • the MPM list for non-ALWIP intra mode may be firstly constructed. Afterwards, partial or all of them may be converted to the MPMs which may be further added to the MPM list for ALWIP coded blocks.
  • pruning may be applied.
  • default modes may be added before those converted from the MPM list of non-ALWIP intra mode.
  • default modes may be added after those converted from the MPM list of non-ALWIP intra mode.
  • default modes may be added in an interleaved way with those converted from the MPM list of non-ALWIP intra mode.
  • the default modes may be fixed to be the same for all kinds of blocks.
  • the default modes may be determined according to coded information, such as availability of neighboring blocks, mode information of neighboring blocks, block dimension.
  • one intra-prediction mode in the MPM list for non-ALWIP intra mode may be converted to its corresponding ALWIP intra-prediction mode, when it is put into the MPM list for ALWIP.
  • all the intra-prediction modes in the MPM list for non-ALWIP intra modes may be converted to corresponding ALWIP intra-prediction modes before being used to construct the MPM list for ALWIP.
  • all the candidate intra-prediction modes may include the intra-prediction modes from neighboring blocks and default intra-prediction modes such as Planar and DC) may be converted to corresponding ALWIP intra-prediction modes before being used to construct the MPM list for non-ALWIP intra modes, if the MPM list for non-ALWIP intra modes may be further used to derive the MPM list for ALWIP.
  • two converted ALWIP intra-prediction modes may be compared.
  • K out of S intra-prediction modes in the MPM list for non-ALWIP intra modes may be picked as the MPM list for ALWIP mode.
  • K is equal to 3 and S is equal to 6.
  • the first K intra-prediction modes in the MPM list for non-ALWIP intra modes may be picked as the MPM list for ALWIP mode.
  • the one or multiple neighboring blocks used to derive the MPM list for ALWIP may also be used to used derive the MPM list for non-ALWIP intra modes (such as normal intra mode, MRL, or ISP) .
  • the neighboring block left to the current block used to derive the MPM list for ALWIP should be the same as that used to derive the MPM list for non-ALWIP intra modes.
  • the left neighboring block used to derive the MPM list for both ALWIP and non-ALWIP intra modes may cover the position (xCb-1, yCb) .
  • the left neighboring block used to derive the MPM list for both ALWIP and non-ALWIP intra modes may cover the position (xCb-1, yCb+H-1) .
  • the left neighboring block and above neighboring block used in the unified MPM list construction is A2 and B2 as shown in FIG. 10.
  • the neighboring block above to the current block used to derive the MPM list for ALWIP should be the same as that used to derive the MPM list for non-ALWIP intra modes.
  • the above neighboring block used to derive the MPM list for both ALWIP and non-ALWIP intra modes may cover the position (xCb, yCb-1) .
  • the above neighboring block used to derive the MPM list for both ALWIP and non-ALWIP intra modes may cover the position (xCb+W-1, yCb-1) .
  • the left neighboring block and above neighboring block used in the unified MPM list construction is A1 and B1 as shown in FIG. 10.
  • the MPM list for ALWIP may be constructed in different ways according to the width and/or height of the current block.
  • different neighboring blocks may be accessed for different block dimensions.
  • the MPM list for ALWIP and the MPM list for non-ALWIP intra modes may be constructed with the same procedure but with different parameters.
  • K out of S intra-prediction modes in the MPM list construction procedure of non-ALWIP intra modes may be derived for the MPM list used in ALWIP mode.
  • K is equal to 3 and S is equal to 6.
  • the first K intra-prediction modes in the MPM list construction procedure may be derived for the MPM list used in ALWIP mode.
  • the first mode in the MPM list may be different.
  • the first mode in the MPM list for non-ALWIP intra modes may be Planar, but it may be a Mode X0 in the MPM list for ALWIP.
  • X0 may be the ALWIP intra-prediction mode converted from Planar.
  • stuffing modes in the MPM list may be different.
  • the first three stuffing modes in the MPM list for non-ALWIP intra modes may be DC, Vertical and Horizontal, but they may be Mode X1, X2, X3 in the MPM list for ALWIP.
  • X1, X2, X3 may be different for different sizeId.
  • the number of stuffing mode may be different.
  • neighboring modes in the MPM list may be different.
  • the normal intra-prediction modes of neighboring blocks are used to construct the MPM list for non-ALWIP intra modes. And they are converted to ALWIP intra-prediction modes to construct the MPM list for ALWIP mode.
  • the shifted modes in the MPM list may be different.
  • X+K0 where X is a normal intra-prediction mode and K0 is an integer may be put into the MPM list for non-ALWIP intra modes.
  • Y+K1 where Y is an ALWIP intra-prediction mode and K1 is an integer may be put into the MPM list for ALWIP, where K0 may be different from K1.
  • K1 may depend on the width and height.
  • a neighboring block is treated as being coded with a predefined intra-prediction mode (such as Planar) if it is coded with ALWIP when constructing the MPM list for the current block with non-ALWIP intra modes.
  • a predefined intra-prediction mode such as Planar
  • a neighboring block is treated as being coded with a predefined ALWIP intra-prediction mode X if it is coded with non-ALWIP intra modes when constructing the MPM list for the current block with ALWIP mode.
  • X may depend on the block dimensions, such as width and/or height.
  • the conditional check of whether the 2 nd block is coded with ALWIP is skipped.
  • the 2 nd block to be accessed is located in a different LCU/CTU row/region compared to the current block, the 2 nd block is treated in the same way as non-ALWIP mode, such as treated as normal intra coded block.
  • K 1.
  • the decoded mode index associated with one ALWIP coded block is mapped to the normal intra mode, such as according to map_alwip_to_angular as described in Section 2.5.7.
  • condition check of whether one neighboring/current block is coded with ALWIP flag may be skipped.
  • the conversion of modes assigned for ALWIP coded blocks and normal intra predictions associated with one accessed block may be skipped.
  • an inferred chroma intra mode (e.g., DM mode) might be always applied if the corresponding luma block is coded with ALWIP mode.
  • chroma intra mode is inferred to be DM mode without signaling if the corresponding luma block is coded with ALWIP mode.
  • the corresponding luma block may be the one covering the corresponding sample of a chroma sample located at a given position (e.g., top-left of current chroma block, center of current chroma block) .
  • the DM mode may be derived according to the intra prediction mode of the corresponding luma block, such as via mapping the (ALWIP) mode to one of the normal intra mode.
  • the special mode is defined to be a given normal intra prediction mode regardless the intra prediction mode associated with the ALWIP coded blocks.
  • ALWIP may also be applied to chroma components.
  • the matrix and/or bias vector may be different for different color components.
  • the matrix and/or bias vector may be predefined jointly for Cb and Cr.
  • Cb and Cr component may be concatenated.
  • Cb and Cr component may be interleaved.
  • the chroma component may share the same ALWIP intra-prediction mode as the corresponding luma block.
  • the same ALWIP intra-prediction mode is applied on the chroma component if the corresponding luma block applies the ALWIP mode and the chroma block is coded with DM mode.
  • the same ALWIP intra-prediction mode is applied on the chroma component and the linear interpolation thereafter can be skipped.
  • the same ALWIP intra-prediction mode is applied on the chroma component with a subsampled matrix and/or bias vector.
  • the number of ALWIP intra-prediction modes for different component may be different.
  • the number of ALWIP intra-prediction modes for chroma components may be less than that for luma component for the same block width and height.
  • a may be signaled at sequence level (e.g. in SPS) , at picture level (e.g. in PPS or picture header) , at slice level (e.g. in slice header) , at tile group level (e.g. in tile group header) , at tile level, at CTU row level, or at CTU level.
  • sequence level e.g. in SPS
  • picture level e.g. in PPS or picture header
  • slice level e.g. in slice header
  • tile group level e.g. in tile group header
  • intra_lwip_flag may not be signaled and inferred to be 0 if ALWIP cannot be applied.
  • ALWIP may depend on the block width (W) and/or height (H) .
  • T 256;
  • T 256;
  • T 256;
  • T 256;
  • intra_lwip_flag may not be signaled and inferred to be 0 if ALWIP cannot be applied.
  • the right shift operation may be different when S is equal to 0 or larger than 0.
  • upsBdryX [x] should be calculated as
  • upsBdryX [x] should be calculated as
  • results should be rounded toward-zero or away-from-zero in the up-sampling process of ALWIP.
  • predSamples [xHor+dX] [yHor] ( (upHor-dX) *predSamples [xHor] [yHor] + dX*predSamples [xHor+upHor] [yHor] +offsetHor) /upHor (8-X39)
  • predSamples [xVer] [yVer+dY] ( (upVer-dY) *predSamples [xVer] [yVer] + dY*predSamples [xVer] [yVer+upVer] +offsetVer) /upVer (8-X40)
  • ALWIP may be used for a CIIP-coded block.
  • a CIIP-coded block it may be explicitly signaled whether an ALWIP intra-prediction mode or a normal intra prediction mode such as Planar is used to generate the intra prediction signal.
  • an ALWIP intra-prediction mode or a normal intra prediction mode such as Planar may be used to generate the intra prediction signal.
  • ALWIP intra-prediction mode may never be used in a CIIP coded block.
  • ii it may be inferred from information of neighboring blocks whether an ALWIP intra-prediction mode or a normal intra prediction mode such as Planar is used to generate the intra prediction signal.
  • the whole or partial of the procedure used to down-sample the neighboring luma samples in the ALWIP mode may be used to down-sample the neighboring samples in the CCLM mode.
  • the down-sampling procedure may be invoked with different parameters/arguments when it is used in the CCLM process and ALWIP process.
  • the down-sampling method (such as selection of neighboring luma locations, down-sampling filters) in the CCLM process may be utilized in the ALWIP process.
  • the procedure used to down-sample the neighboring luma samples at least include the selection of down-sampled positions, the down-sampling filters, the rounding and clipping operations.
  • whether such constraint may be applied or not may depend on the dimension information of the block, e.g., same as conditions described in (15) .
  • ALWIP mode may be disallowed when RST or/and secondary transform or/and rotation transform or/and NSST is applied.
  • a block coded with ALWIP mode may apply RST or/and secondary transform or/and rotation transform or/and Non-Separable Secondary Transform (NSST) .
  • the selection of transform matrix may depend the ALWIP intra-prediction mode.
  • the selection of transform matrix may depend the normal intra-prediction mode which is converted from the ALWIP intra-prediction mode.
  • the selection of transform matrix may depend the classification on the normal intra-prediction mode which is converted from the ALWIP intra-prediction mode.
  • Block-based DPCM Block-based DPCM
  • Residue RDPCM Residue
  • ALWIP mode may be disallowed when BDPCM or RDPCM is applied.
  • a block coded with ALWIP mode may only use DCT-II as the transform.
  • the signalling of transform matrix indices is always skipped.
  • the transform used for a block coded with ALWIP mode may be implicitly derived instead of explicitly signaled.
  • the transform may be selected following the way proposed in JVET-M0303.
  • a block coded with ALWIP mode may only use transform skip.
  • ALWIP mode information (such as enabled/disabled, prediction mode index) may be conditionally signalled after indications of transform matrix.
  • the indications of ALWIP mode information may be signalled.
  • the indications of ALWIP mode information may be skipped for some pre-defined transform matrices.
  • a block coded with ALWIP mode is regarded to be coded with a normal intra-prediction converted from the ALWIP intra-prediction mode when the selected transform is mode-dependent.
  • ALWIP mode may not use transform skip.
  • ALWIP mode may be disallowed when transform skip is applied.
  • Unfiltered neighboring samples may be used in ALWIP mode.
  • filtered neighboring samples may be used in ALWIP mode.
  • filtered neighboring samples may be used for down sampling and unfiltered neighboring samples may be used for up sampling.
  • unfiltered neighboring samples may be used for down sampling and filtered neighboring samples may be used for up sampling.
  • filtered left neighboring samples may be used in up sampling and unfiltered above neighboring samples may be used in up sampling.
  • unfiltered left neighboring samples may be used in up sampling and filtered above neighboring samples may be used in up sampling.
  • whether filter or unfiltered neighboring samples is used may depend on the ALWIP mode.
  • ALWIP mode may be converted to traditional intra prediction mode, and whether filtered or unfiltered neighboring samples is used may depend on the converted traditional intra prediction mode. For example, such decision is same as traditional intra prediction modes.
  • the filtered samples may be generated same as traditional intra prediction modes.
  • Which matrices or/and offset vectors are used may depend on reshaping (a.k.a. LMCS, luma mapping with chroma scaling) information.
  • matrices or/and offset vectors may be used when reshaping is on and off.
  • different matrices or/and offset vectors may be used for different reshaping parameters.
  • ALWIP may be always performed in original domain.
  • neighboring sample are mapped to the original domain (if reshaping is applied) before used in ALWIP.
  • ALWIP may be disabled when reshaping is applied.
  • reshaping may be disabled when ALWIP is enabled.
  • ALWIP may be disabled for HDR (high dynamic range) content when reshaping is applied.
  • the matrices used in ALWIP may depend on sample bit-depth.
  • the offset values used in ALWIP may depend on sample bit-depth.
  • the sample bit-depth may be the bit-depth of input array for a color component such as luma.
  • the sample bit-depth may be the bit-depth of internal array/reconstructed sample for a color component, such as luma.
  • the matrix parameters and/or offset values for a specified block size may be derived from the matrix parameters and/or offset values for other block sizes.
  • the 16x8 matrix of 8x8 block can be derived from the 16x4 matrix of 4x4 block.
  • the prediction generated by ALWIP may be treated as an intermedium signal which will be processed to obtain the prediction signal to be further used.
  • Position Dependent Intra Prediction Combination may be applied on the prediction generated by ALWIP to generate the prediction signal to be further used.
  • PDPC is done on an ALWIP coded block in the same way as the block is coded with a specific normal intra-prediction mode, such as Planar or DC.
  • PDPC is done on an ALWIP coded block in the same way as the block coded with a normal intra-prediction mode which is converted from the ALWIP intra-prediction mode.
  • PDPC is applied on an ALWIP coded block conditionally.
  • PDPC is applied on an ALWIP coded block only when PDPC is applied on the normal intra-prediction mode which is converted from the ALWIP intra-prediction mode.
  • the boundary samples prediction generated by ALWIP may be filtered with neighbouring samples to generate the prediction signal to be further used.
  • filtering on boundary samples is done on an ALWIP coded block in the same way as the block is coded with a specific normal intra-prediction mode, such as Planar or DC.
  • filtering on boundary samples is done on an ALWIP coded block in the same way as the block coded with a normal intra-prediction mode which is converted from the ALWIP intra-prediction mode.
  • filtering on boundary samples is applied on an ALWIP coded block conditionally.
  • filtering on boundary samples is applied on an ALWIP coded block only when filtering on boundary samples is applied on the normal intra-prediction mode which is converted from the ALWIP intra-prediction mode.
  • interpolation filters other than bilinear interpolation filter may be used in the up-sampling process of ALWIP.
  • 4-tap interpolation filters may be used in the up-sampling process of ALWIP.
  • the 4-tap interpolation filters in VVC used to do the motion compensation for chroma components may be used in the up-sampling process of ALWIP.
  • the 4-tap interpolation filters in VVC used to do angular intra-prediction may be used in the up-sampling process of ALWIP.
  • the 8-tap interpolation filters in VVC used to do the motion compensation for luma component may be used in the up-sampling process of ALWIP.
  • Samples within a block coded in ALWIP mode may be predicted in different ways.
  • prediction of a sW*sH sub-block within it may be generated by applying sW*sH ALWIP to it.
  • prediction of its top-left W/2*H/2 block may be generated by applying W/2*H/2 ALWIP to it.
  • prediction of its left W/2*H block may be generated by applying W/2*H ALWIP to it.
  • prediction of its top W*H/2 block may be generated by applying W*H/2 ALWIP to it.
  • the sW*sH sub-block may have available left or/and above neighboring samples.
  • how to decide the position of the sub-block may depend on dimension of the block.
  • prediction of its left W/2*H block may be generated by applying W/2*H ALWIP to it.
  • prediction of its top W*H/2 block may be generated by applying W*H/2 ALWIP to it.
  • prediction of its top-left W/2*H/2 block may be generated by applying W/2*H/2 ALWIP to it.
  • prediction of the remaining samples may be generated by applying the W*H ALWIP.
  • prediction of the remaining samples may be generated by applying conventional intra prediction (e.g., using the converted intra prediction mode as the intra mode) .
  • calculation may be skipped for samples in the sW*sH sub-block.
  • Samples within a block coded in ALWIP mode may be predicted in sub-block (e.g., with size sW*sH) level.
  • sW*sH ALWIP may be applied to each sub-block using neighboring reconstructed samples (e.g., for boundary sub-blocks) or/and neighboring predicted samples (e.g., for inner sub-blocks) .
  • sub-blocks may be predicted in raster-scan order.
  • sub-blocks may be predicted in zigzag order.
  • width (height) of sub-blocks may be no larger than sWMax (sHMax) .
  • the block when a block with either width or height or both width and height are both larger than (or equal to) a threshold L, the block may be split into multiple sub-blocks.
  • the threshold L may be pre-defined or signaled in SPS/PPS/picture/slice/tile group/tile level.
  • the thresholds may depend on certain coded information, such as block size, picture type, temporal layer index, etc. al.
  • neighbouring samples are not filtered before being used in ALWIP.
  • neighbouring samples are conditionally filtered before being used in ALWIP.
  • neighbouring samples are filtered before being used in ALWIP only when the ALWIP intra-prediction mode is equal to one or some specific values.
  • FIG. 11 shows a flowchart of an exemplary method for video processing.
  • the method 1100 includes, at step 1110, determining that a current video block is coded using an affine linear weighted intra prediction (ALWIP) mode.
  • AWIP affine linear weighted intra prediction
  • the method 1100 includes, at step 1120, constructing, based on the determining, at least a portion of a most probable mode (MPM) list for the ALWIP mode based on an at least a portion of an MPM list for a non-ALWIP intra mode.
  • MPM most probable mode
  • the method 1100 includes, at step 1130, performing, based on the MPM list for the ALWIP mode, a conversion between the current video block and a bitstream representation of the current video block.
  • a size of the MPM list of the ALWIP mode is identical to a size of the MPM list for the non-ALWIP intra mode. In an example, the size of the MPM list of the ALWIP mode is 6.
  • the method 1100 further comprises the step of inserting default modes to the MPM list for the ALWIP mode.
  • the default modes are inserted prior to the portion of a MPM list for the ALWIP mode that is based on the MPM list for the non-ALWIP intra mode.
  • the default modes are inserted subsequent to the portion of a MPM list for the ALWIP mode that is based on the MPM list for the non-ALWIP intra mode.
  • the default modes are inserted in an interleaved manner with the portion of a MPM list for the ALWIP mode that is based on the MPM list for the non-ALWIP intra mode.
  • constructing the MPM list for the ALWIP mode and the MPM list for the non-ALWIP intra mode is based on one or more neighboring blocks.
  • constructing the MPM list for the ALWIP mode and the MPM list for the non-ALWIP intra mode is based a height or a width of the current video block.
  • constructing the MPM list for the ALWIP mode is based on a first set of parameters that is different from a second set of parameters used to construct the MPM list for the non-ALWIP intra mode.
  • the method 1100 further includes the step of determining that a neighboring block of the current video block has been coded with the ALWIP mode, and designating, in constructing the MPM list for the non-ALWIP intra mode, the neighboring block as unavailable.
  • the method 1100 further includes the step of determining that a neighboring block of the current video block has been coded with the non-ALWIP intra mode, and designating, in constructing the MPM list for the ALWIP mode, the neighboring block as unavailable.
  • the non-ALWIP intra mode is based on a normal intra mode, a multiple reference line (MRL) intra prediction mode or an intra sub-partition (ISP) tool.
  • MNL multiple reference line
  • ISP intra sub-partition
  • FIG. 12 shows a flowchart of an exemplary method for video processing.
  • the method 1200 includes, at step 1210, determining that a luma component of a current video block is coded using an affine linear weighted intra prediction (ALWIP) mode.
  • AWIP affine linear weighted intra prediction
  • the method 1200 includes, at step 1220, inferring, based on the determining, a chroma intra mode.
  • the method 1200 includes, at step 1230, performing, based on the chroma intra mode, a conversion between the current video block and a bitstream representation of the current video block.
  • the luma component covers a predetermined chroma sample of the chroma component.
  • the predetermined chroma sample is a top-left sample or a center sample of the chroma component.
  • the inferred chroma intra mode is a DM mode.
  • the inferred chroma intra mode is the ALWIP mode.
  • the ALWIP mode is applied to one or more chroma components of the current video block.
  • different matrix or bias vectors of the ALWIP mode are applied to different color components of the current video block.
  • the different matrix or bias vectors are predefined jointly for Cb and Cr components.
  • the Cb and Cr components are concatenated.
  • the Cb and Cr components are interleaved.
  • FIG. 13 shows a flowchart of an exemplary method for video processing.
  • the method 1300 includes, at step 1310, determining that a current video block is coded using an affine linear weighted intra prediction (ALWIP) mode.
  • AWIP affine linear weighted intra prediction
  • the method 1300 includes, at step 1320, performing, based on the determining, a conversion between the current video block and a bitstream representation of the current video block.
  • the determining is based on signaling in a sequence parameter set (SPS) , a picture parameter set (PPS) , a slice header, a tile group header, a tile header, a coding tree unit (CTU) row or a CTU region.
  • SPS sequence parameter set
  • PPS picture parameter set
  • CTU coding tree unit
  • the determining is based on a height (H) or a width (W) of the current video block.
  • the determining is based on a height (H) or a width (W) of the current video block.
  • H height
  • W width
  • W + H ⁇ T W + H ⁇ T.
  • W ⁇ H ⁇ T W ⁇ H ⁇ T.
  • T 256.
  • FIG. 14 shows a flowchart of an exemplary method for video processing.
  • the method 1400 includes, at step 1410, determining that a current video block is coded using a coding mode different from an affine linear weighted intra prediction (ALWIP) mode.
  • AWIP affine linear weighted intra prediction
  • the method 1400 includes, at step 1420, performing, based on the determining, a conversion between the current video block and a bitstream representation of the current video block.
  • the coding mode is a combined intra and inter prediction (CIIP) mode
  • method 1400 further includes the step of performing a selection between the ALWIP mode and a normal intra prediction mode.
  • performing the selection is based on an explicit signaling in the bitstream representation of the current video block.
  • performing the selection is based on predetermined rule.
  • the predetermined rule always selects the ALWIP mode when the current video block is coded using the CIIP mode.
  • the predetermined rule always selects the normal intra prediction mode when the current video block is coded using the CIIP mode.
  • the coding mode is a cross-component linear model (CCLM) prediction mode.
  • a downsampling procedure for the ALWIP mode is based on a downsampling procedure for the CCLM prediction mode.
  • the downsampling procedure for the ALWIP mode is based on a first set of parameters, and wherein the downsampling procedure for the CCLM prediction mode is based on a second set of parameters different from the first set of parameters.
  • the downsampling procedure for the ALWIP mode or the CCLM prediction mode comprises at least one of a selection of downsampled positions, a selection of downsampling filters, a rounding operation or a clipping operation.
  • the method 1400 further includes the step of applying one or more of a Reduced Secondary Transform (RST) , a secondary transform, a rotation transform or a Non-Separable Secondary Transform (NSST) .
  • RST Reduced Secondary Transform
  • NSST Non-Separable Secondary Transform
  • the method 1400 further includes the step of applying block-based differential pulse coded modulation (DPCM) or residual DPCM.
  • DPCM block-based differential pulse coded modulation
  • residual DPCM residual DPCM
  • FIG. 15 is a block diagram of a video processing apparatus 1500.
  • the apparatus 1500 may be used to implement one or more of the methods described herein.
  • the apparatus 1500 may be embodied in a smartphone, tablet, computer, Internet of Things (IoT) receiver, and so on.
  • the apparatus 1500 may include one or more processors 1502, one or more memories 1504 and video processing hardware 1506.
  • the processor (s) 1502 may be configured to implement one or more methods (including, but not limited to, methods 1100to 1400 and 2000 to 2300) described in the present document.
  • the memory (memories) 1504 may be used for storing data and code used for implementing the methods and techniques described herein.
  • the video processing hardware 1506 may be used to implement, in hardware circuitry, some techniques described in the present document.
  • the video coding methods may be implemented using an apparatus that is implemented on a hardware platform as described with respect to FIG. 15.
  • FIG. 16 is a block diagram showing an example video processing system 1600 in which various techniques disclosed herein may be implemented.
  • the system 1600 may include input 1602 for receiving video content.
  • the video content may be received in a raw or uncompressed format, e.g., 8 or 10 bit multi-component pixel values, or may be in a compressed or encoded format.
  • the input 1602 may represent a network interface, a peripheral bus interface, or a storage interface. Examples of network interface include wired interfaces such as Ethernet, passive optical network (PON) , etc. and wireless interfaces such as Wi-Fi or cellular interfaces.
  • PON passive optical network
  • the system 1600 may include a coding component 1604 that may implement the various coding or encoding methods described in the present document.
  • the coding component 1604 may reduce the average bitrate of video from the input 1602 to the output of the coding component 1604 to produce a coded representation of the video.
  • the coding techniques are therefore sometimes called video compression or video transcoding techniques.
  • the output of the coding component 1604 may be either stored, or transmitted via a communication connected, as represented by the component 1606.
  • the stored or communicated bitstream (or coded) representation of the video received at the input 1602 may be used by the component 1608 for generating pixel values or displayable video that is sent to a display interface 1610.
  • the process of generating user-viewable video from the bitstream representation is sometimes called video decompression.
  • certain video processing operations are referred to as “coding” operations or tools, it will be appreciated that the coding tools or operations are used at an encoder and corresponding decoding tools or operations that reverse the results of the coding will be performed by
  • peripheral bus interface or a display interface may include universal serial bus (USB) or high definition multimedia interface (HDMI) or Displayport, and so on.
  • storage interfaces include SATA (serial advanced technology attachment) , PCI, IDE interface, and the like.
  • Some embodiments of the disclosed technology include making a decision or determination to enable a video processing tool or mode.
  • the encoder when the video processing tool or mode is enabled, the encoder will use or implement the tool or mode in the processing of a block of video, but may not necessarily modify the resulting bitstream based on the usage of the tool or mode. That is, a conversion from the block of video to the bitstream representation of the video will use the video processing tool or mode when it is enabled based on the decision or determination.
  • the decoder when the video processing tool or mode is enabled, the decoder will process the bitstream with the knowledge that the bitstream has been modified based on the video processing tool or mode. That is, a conversion from the bitstream representation of the video to the block of video will be performed using the video processing tool or mode that was enabled based on the decision or determination.
  • Some embodiments of the disclosed technology include making a decision or determination to disable a video processing tool or mode.
  • the encoder will not use the tool or mode in the conversion of the block of video to the bitstream representation of the video.
  • the decoder will process the bitstream with the knowledge that the bitstream has not been modified using the video processing tool or mode that was disabled based on the decision or determination.
  • FIG. 17 is a block diagram that illustrates an example video coding system 100 that may utilize the techniques of this disclosure.
  • video coding system 100 may include a source device 110 and a destination device 120.
  • Source device 110 generates encoded video data which may be referred to as a video encoding device.
  • Destination device 120 may decode the encoded video data generated by source device 110 which may be referred to as a video decoding device.
  • Source device 110 may include a video source 112, a video encoder 114, and an input/output (I/O) interface 116.
  • I/O input/output
  • Video source 112 may include a source such as a video capture device, an interface to receive video data from a video content provider, and/or a computer graphics system for generating video data, or a combination of such sources.
  • the video data may comprise one or more pictures.
  • Video encoder 114 encodes the video data from video source 112 to generate a bitstream.
  • the bitstream may include a sequence of bits that form a coded representation of the video data.
  • the bitstream may include coded pictures and associated data.
  • the coded picture is a coded representation of a picture.
  • the associated data may include sequence parameter sets, picture parameter sets, and other syntax structures.
  • I/O interface 116 may include a modulator/demodulator (modem) and/or a transmitter.
  • the encoded video data may be transmitted directly to destination device 120 via I/O interface 116 through network 130a.
  • the encoded video data may also be stored onto a storage medium/server 130b for access by destination device 120.
  • Destination device 120 may include an I/O interface 126, a video decoder 124, and a display device 122.
  • I/O interface 126 may include a receiver and/or a modem. I/O interface 126 may acquire encoded video data from the source device 110 or the storage medium/server 130b. Video decoder 124 may decode the encoded video data. Display device 122 may display the decoded video data to a user. Display device 122 may be integrated with the destination device 120, or may be external to destination device 120 which be configured to interface with an external display device.
  • Video encoder 114 and video decoder 124 may operate according to a video compression standard, such as the High Efficiency Video Coding (HEVC) standard, Versatile Video Coding (VVM) standard and other current and/or further standards.
  • HEVC High Efficiency Video Coding
  • VVM Versatile Video Coding
  • FIG. 18 is a block diagram illustrating an example of video encoder 200, which may be video encoder 114 in the system 100 illustrated in FIG. 17.
  • Video encoder 200 may be configured to perform any or all of the techniques of this disclosure.
  • video encoder 200 includes a plurality of functional components. The techniques described in this disclosure may be shared among the various components of video encoder 200.
  • a processor may be configured to perform any or all of the techniques described in this disclosure.
  • the functional components of video encoder 200 may include a partition unit 201, a predication unit 202 which may include a mode select unit 203, a motion estimation unit 204, a motion compensation unit 205 and an intra prediction unit 206, a residual generation unit 207, a transform unit 208, a quantization unit 209, an inverse quantization unit 210, an inverse transform unit 211, a reconstruction unit 212, a buffer 213, and an entropy encoding unit 214.
  • a partition unit 201 may include a mode select unit 203, a motion estimation unit 204, a motion compensation unit 205 and an intra prediction unit 206, a residual generation unit 207, a transform unit 208, a quantization unit 209, an inverse quantization unit 210, an inverse transform unit 211, a reconstruction unit 212, a buffer 213, and an entropy encoding unit 214.
  • video encoder 200 may include more, fewer, or different functional components.
  • predication unit 202 may include an intra block copy (IBC) unit.
  • the IBC unit may perform predication in an IBC mode in which at least one reference picture is a picture where the current video block is located.
  • IBC intra block copy
  • motion estimation unit 204 and motion compensation unit 205 may be highly integrated, but are represented in the example of FIG. 18 separately for purposes of explanation.
  • Partition unit 201 may partition a picture into one or more video blocks.
  • Video encoder 200 and video decoder 300 may support various video block sizes.
  • Mode select unit 203 may select one of the coding modes, intra or inter, e.g., based on error results, and provide the resulting intra-or inter-coded block to a residual generation unit 207 to generate residual block data and to a reconstruction unit 212 to reconstruct the encoded block for use as a reference picture.
  • Mode select unit 203 may select a combination of intra and inter predication (CIIP) mode in which the predication is based on an inter predication signal and an intra predication signal.
  • CIIP intra and inter predication
  • Mode select unit 203 may also select a resolution for a motion vector (e.g., a sub-pixel or integer pixel precision) for the block in the case of inter-predication.
  • motion estimation unit 204 may generate motion information for the current video block by comparing one or more reference frames from buffer 213 to the current video block.
  • Motion compensation unit 205 may determine a predicted video block for the current video block based on the motion information and decoded samples of pictures from buffer 213 other than the picture associated with the current video block.
  • Motion estimation unit 204 and motion compensation unit 205 may perform different operations for a current video block, for example, depending on whether the current video block is in an I slice, a P slice, or a B slice.
  • motion estimation unit 204 may perform uni-directional prediction for the current video block, and motion estimation unit 204 may search reference pictures of list 0 or list 1 for a reference video block for the current video block. Motion estimation unit 204 may then generate a reference index that indicates the reference picture in list 0 or list 1 that contains the reference video block and a motion vector that indicates a spatial displacement between the current video block and the reference video block. Motion estimation unit 204 may output the reference index, a prediction direction indicator, and the motion vector as the motion information of the current video block. Motion compensation unit 205 may generate the predicted video block of the current block based on the reference video block indicated by the motion information of the current video block.
  • motion estimation unit 204 may perform bi-directional prediction for the current video block, motion estimation unit 204 may search the reference pictures in list 0 for a reference video block for the current video block and may also search the reference pictures in list 1 for another reference video block for the current video block. Motion estimation unit 204 may then generate reference indexes that indicate the reference pictures in list 0 and list 1 containing the reference video blocks and motion vectors that indicate spatial displacements between the reference video blocks and the current video block. Motion estimation unit 204 may output the reference indexes and the motion vectors of the current video block as the motion information of the current video block. Motion compensation unit 205 may generate the predicted video block of the current video block based on the reference video blocks indicated by the motion information of the current video block.
  • motion estimation unit 204 may output a full set of motion information for decoding processing of a decoder.
  • motion estimation unit 204 may do not output a full set of motion information for the current video. Rather, motion estimation unit 204 may signal the motion information of the current video block with reference to the motion information of another video block. For example, motion estimation unit 204 may determine that the motion information of the current video block is sufficiently similar to the motion information of a neighboring video block.
  • motion estimation unit 204 may indicate, in a syntax structure associated with the current video block, a value that indicates to the video decoder 300 that the current video block has the same motion information as the another video block.
  • motion estimation unit 204 may identify, in a syntax structure associated with the current video block, another video block and a motion vector difference (MVD) .
  • the motion vector difference indicates a difference between the motion vector of the current video block and the motion vector of the indicated video block.
  • the video decoder 300 may use the motion vector of the indicated video block and the motion vector difference to determine the motion vector of the current video block.
  • video encoder 200 may predictively signal the motion vector.
  • Two examples of predictive signaling techniques that may be implemented by video encoder 200 include advanced motion vector predication (AMVP) and merge mode signaling.
  • AMVP advanced motion vector predication
  • merge mode signaling merge mode signaling
  • Intra prediction unit 206 may perform intra prediction on the current video block. When intra prediction unit 206 performs intra prediction on the current video block, intra prediction unit 206 may generate prediction data for the current video block based on decoded samples of other video blocks in the same picture.
  • the prediction data for the current video block may include a predicted video block and various syntax elements.
  • Residual generation unit 207 may generate residual data for the current video block by subtracting (e.g., indicated by the minus sign) the predicted video block (s) of the current video block from the current video block.
  • the residual data of the current video block may include residual video blocks that correspond to different sample components of the samples in the current video block.
  • residual generation unit 207 may not perform the subtracting operation.
  • Transform processing unit 208 may generate one or more transform coefficient video blocks for the current video block by applying one or more transforms to a residual video block associated with the current video block.
  • quantization unit 209 may quantize the transform coefficient video block associated with the current video block based on one or more quantization parameter (QP) values associated with the current video block.
  • QP quantization parameter
  • Inverse quantization unit 210 and inverse transform unit 211 may apply inverse quantization and inverse transforms to the transform coefficient video block, respectively, to reconstruct a residual video block from the transform coefficient video block.
  • Reconstruction unit 212 may add the reconstructed residual video block to corresponding samples from one or more predicted video blocks generated by the predication unit 202 to produce a reconstructed video block associated with the current block for storage in the buffer 213.
  • loop filtering operation may be performed reduce video blocking artifacts in the video block.
  • Entropy encoding unit 214 may receive data from other functional components of the video encoder 200. When entropy encoding unit 214 receives the data, entropy encoding unit 214 may perform one or more entropy encoding operations to generate entropy encoded data and output a bitstream that includes the entropy encoded data.
  • FIG. 19 is a block diagram illustrating an example of video decoder 300 which may be video decoder 114 in the system 100 illustrated in FIG. 17.
  • the video decoder 300 may be configured to perform any or all of the techniques of this disclosure.
  • the video decoder 300 includes a plurality of functional components.
  • the techniques described in this disclosure may be shared among the various components of the video decoder 300.
  • a processor may be configured to perform any or all of the techniques described in this disclosure.
  • video decoder 300 includes an entropy decoding unit 301, a motion compensation unit 302, an intra prediction unit 303, an inverse quantization unit 304, an inverse transformation unit 305 , and a reconstruction unit 306 and a buffer 307.
  • Video decoder 300 may, in some examples, perform a decoding pass generally reciprocal to the encoding pass described with respect to video encoder 200 (FIG. 18) .
  • Entropy decoding unit 301 may retrieve an encoded bitstream.
  • the encoded bitstream may include entropy coded video data (e.g., encoded blocks of video data) .
  • Entropy decoding unit 301 may decode the entropy coded video data, and from the entropy decoded video data, motion compensation unit 302 may determine motion information including motion vectors, motion vector precision, reference picture list indexes, and other motion information. Motion compensation unit 302 may, for example, determine such information by performing the AMVP and merge mode.
  • Motion compensation unit 302 may produce motion compensated blocks, possibly performing interpolation based on interpolation filters. Identifiers for interpolation filters to be used with sub-pixel precision may be included in the syntax elements.
  • Motion compensation unit 302 may use interpolation filters as used by video encoder 20 during encoding of the video block to calculate interpolated values for sub-integer pixels of a reference block. Motion compensation unit 302 may determine the interpolation filters used by video encoder 200 according to received syntax information and use the interpolation filters to produce predictive blocks.
  • Motion compensation unit 302 may uses some of the syntax information to determine sizes of blocks used to encode frame (s) and/or slice (s) of the encoded video sequence, partition information that describes how each macroblock of a picture of the encoded video sequence is partitioned, modes indicating how each partition is encoded, one or more reference frames (and reference frame lists) for each inter-encoded block, and other information to decode the encoded video sequence.
  • Intra prediction unit 303 may use intra prediction modes for example received in the bitstream to form a prediction block from spatially adjacent blocks.
  • Inverse quantization unit 303 inverse quantizes, i.e., de-quantizes, the quantized video block coefficients provided in the bitstream and decoded by entropy decoding unit 301.
  • Inverse transform unit 303 applies an inverse transform.
  • Reconstruction unit 306 may sum the residual blocks with the corresponding prediction blocks generated by motion compensation unit 202 or intra-prediction unit 303 to form decoded blocks. If desired, a deblocking filter may also be applied to filter the decoded blocks in order to remove blockiness artifacts.
  • the decoded video blocks are then stored in buffer 307, which provides reference blocks for subsequent motion compensation/intra predication and also produces decoded video for presentation on a display device.
  • a prediction block for the current video block is determined by a row and column wise averaging, followed by a matrix multiplication, followed by an interpolation to determine the prediction block.
  • FIG. 20 shows an example flowchart of an example method 2000 for matrix-based intra prediction.
  • Operation 2002 includes performing a conversion between a current video block of a video and a bitstream representation of the current video block according to a rule, where the rule specifies a relationship between samples of the current video block and matrices or offset values applied in a matrix weighted intra prediction (MIP) mode during the conversion, and where the MIP mode includes determining a prediction block of the current video block by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation.
  • MIP matrix weighted intra prediction
  • the rule specifies that elements of the matrices applied in the MIP mode are dependent on a bit-depth of the samples. In some embodiments for method 2000, the rule specifies that the offset values applied in the MIP mode are dependent on a bit-depth of the samples. In some embodiments for method 2000, the rule specifies that elements of the matrices and the offset values have a M-bit precision for the samples having a N-bit precision, wherein M is less than or equal to N. In some embodiments for method 2000, M is 8 and N is 10. In some embodiments for method 2000, a bit-depth of the samples is the same as a second bit-depth of an input array for a color component.
  • a bit-depth of the samples is the same as a second bit-depth of an internal array or a reconstructed sample for a color component.
  • the color component includes a luma component.
  • a first set of parameters for the matrices and/or offset values for the current video block are derived from a second set of parameters for a second set of matrices and/or second set of offset values of another video block.
  • the current video block includes a 8x8 video block
  • the another video block includes a 4x4 video block
  • the first set of parameters for 16x8 matrix is derived from the second set of parameters for 16x4 matrix.
  • FIG. 21 shows an example flowchart of an example method 2100 for matrix-based intra prediction.
  • Operation2102 includes generating, for a current video block, an intermediate prediction block using a matrix weighted intra prediction (MIP) mode in which the intermediate prediction block of the current video block is determined by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation.
  • Operation 2104 includes generating, based on the intermediate prediction block, a final prediction block based on an additional operation.
  • Operation 2106 includes performing, based on the final prediction signal, a conversion between the current video block and a bitstream representation of the current video block.
  • the additional operation is a position dependent intra prediction combination (PDPC) .
  • a first operation comprising the generating the final prediction signal using the PDPC is identical to a second operation comprising applying the PDPC to a prediction signal generated using an intra-prediction mode.
  • the intra-prediction mode includes a planar mode or a DC mode.
  • a first operation comprising the generating the final prediction signal using the PDPC is identical to a second operation comprising applying the PDPC to a prediction signal generated using an intra-prediction mode, and the intra-prediction mode is converted from the MIP mode.
  • the PDPC is applied to the intermediate prediction block of the current video block based on a rule.
  • the rule indicates that the PDPC is to be applied to the intermediate prediction block of the current video block in response to the PDPC being applied to a prediction signal generated by an intra-prediction mode that is converted from the MIP mode.
  • the additional operation is a filtering operation in which boundary samples of the current video block are filtered with neighboring samples of the current video block.
  • the filtering operation for filtering the boundary samples of the current video block coded with the MIP mode is identical to another filtering operation for filtering the boundary samples using an intra-prediction mode.
  • the intra-prediction mode includes a planar mode or a direct current (DC) mode.
  • the filtering operation for filtering the boundary samples of the current video block coded with the MIP mode is identical to another filtering operation for filtering the boundary samples using an intra-prediction mode, and the intra-prediction mode is converted from the MIP mode.
  • the filtering operation is applied based on a rule.
  • the rule indicates that the filtering operation is applied to filter the boundary samples in response to the boundary samples being filtered with an intra-prediction mode that is converted from the MIP mode.
  • FIG. 22 shows an example flowchart of an example method 2200 for matrix-based intra prediction.
  • Operation 2202 includes performing a conversion between a current video block of a video and a bitstream representation of the current video block, where the conversion includes predicting a plurality of samples of at least a portion of the current video block in a matrix weighted intra prediction (MIP) mode in which a prediction block of the portion of current video block is determined by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation.
  • MIP matrix weighted intra prediction
  • the plurality of samples belong to a sub-block of the current video block
  • the current video block has a width (W) and a height (H)
  • the sub-block has a width (sW) and a height (sH)
  • the plurality of samples for the sub-block are predicted by applying the MIP to the sub-block.
  • the plurality of samples of the sub-block with the width (sW) and the height (sH) includes left neighboring samples of the current video block or above neighboring samples of the current video block.
  • the plurality of samples belong to a sub-block of the current video block, the current video block has a width (W) and a height (H) , the sub-block is a top left W/2*H/2 block of the current video block, and the plurality of samples for the sub-block are predicted by applying the MIP to the sub-block.
  • the plurality of samples belong to a sub-block of the current video block, the current video block has a width (W) and a height (H) , the sub-block is a left W/2*H block of the current video block, and the plurality of samples for the sub-block are predicted by applying the MIP to the sub-block.
  • the plurality of samples belong to a sub-block of the current video block
  • the current video block has a width (W) and a height (H)
  • the sub-block is a top W*H/2 block of the current video block
  • the plurality of samples for the sub-block are predicted by applying the MIP to the sub-block.
  • the plurality of samples belong to a sub-block of the current video block
  • the current video block has a width (W) and a height (H)
  • the sub-block has a width (sW) and a height (sH)
  • the plurality of samples for the sub-block are predicted by applying the MIP to the sub-block by using left neighboring samples of the current video block or by using above neighboring samples of the current video block.
  • the plurality of samples belong to a sub-block of the current video block, a location of the sub-block is based on a relationship between a width (W) and a height (H) of the current video block.
  • the sub-block is a left W/2*H block of the current video block in response to W ⁇ H, and the plurality of samples for the sub-block are predicted by applying the MIP to the sub-block.
  • the sub-block is a top W*H/2 block of the current video block in response to H ⁇ W, and the plurality of samples for the sub-block are predicted by applying the MIP to the sub-block.
  • the plurality of samples belong to a sub-block of the current video block, and the method further comprises: predicting a second set of samples of the current video block, where the second set of samples are located outside of the sub-block, and where the second set of samples are predicted by applying the MIP to the current video block.
  • the plurality of samples belong to a sub-block of the current video block, and where the method further comprises: predicting a second set of samples of the current video block, where the second set of samples are located outside of the sub-block, where the second set of samples are predicted by applying an intra prediction mode to the current video block, and where the intra prediction mode is converted from the MIP mode.
  • the plurality of samples belong to a sub-block of the current video block, and where the method further comprises: predicting a second set of samples of the current video block, where the second set of samples are located outside of the sub-block, and where the second set of samples are predicted by applying the MIP to a region of the current video block that excludes the sub-block.
  • the plurality of samples belong to at least one sub-block of the current video block.
  • a plurality of samples is predicted by applying the MIP to a sub-block, and for each sub-block, the MIP is applied to the sub-block by using neighboring reconstructed samples for the sub-block and/or by using neighboring predicted samples for the sub-block.
  • the neighboring reconstructed samples are used for the sub-block located at a boundary of the current video block.
  • the neighboring reconstructed samples are used for the sub-block located within the current video block such that a portion of a boundary of the sub-block is not coextensive with a portion of a boundary of the current video block.
  • the plurality of sub-blocks are predicted in a raster-scan order. In some embodiments for method 2200, the plurality of sub-blocks are predicted in a zigzag order.
  • a width and a height of the at least one sub-block is not greater than a maximum width and a maximum height, respectively.
  • the method 2200 further comprises splitting the current video block into multiple sub-blocks in response to any one or more of a width and a height of the current video block being greater than or equal to a threshold.
  • the threshold is pre-defined.
  • the threshold is signaled in a sequence parameter set (SPS) , picture parameter set (PPS) , a picture header, a slice header, a tile group header or a tile header.
  • the threshold is based on coded information associated with the current video block.
  • the coded information includes a block size of the current video block, a picture type of the current video block, or a temporal layer index of the current video block.
  • FIG. 23 shows an example flowchart of an example method 2300 for matrix-based intra prediction.
  • Operation 2302 includes performing a conversion between a current video block of a video and a bitstream representation of the current video block, where the conversion is based on a rule that indicates whether to filter neighboring samples of the current video block prior to applying the matrix weighted intra prediction (MIP) mode during the conversion, and where the MIP mode includes determining a prediction block of the current video block by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation.
  • MIP matrix weighted intra prediction
  • the rule indicates that the neighboring samples are filtered before being used in the MIP mode. In some embodiments for method 2300, the rule indicates that the neighboring samples are not filtered before being used in the MIP mode. In some embodiments for method 2300, the rule indicates that the neighboring samples are filtered before being used in the MIP mode in response to the MIP mode being equal to a particular value.
  • video processing may refer to video encoding, video decoding, video compression or video decompression.
  • video compression algorithms may be applied during conversion from pixel representation of a video to a corresponding bitstream representation or vice versa.
  • the bitstream representation of a current video block may, for example, correspond to bits that are either co-located or spread in different places within the bitstream, as is defined by the syntax.
  • a macroblock may be encoded in terms of transformed and coded error residual values and also using bits in headers and other fields in the bitstream.
  • a decoder may parse a bitstream with the knowledge that some fields may be present, or absent, based on the determination, as is described in the above solutions.
  • an encoder may determine that certain syntax fields are or are not to be included and generate the coded representation accordingly by including or excluding the syntax fields from the coded representation.
  • Implementations of the subject matter and the functional operations described in this patent document can be implemented in various systems, digital electronic circuitry, or in computer software, firmware, or hardware, including the structures disclosed in this specification and their structural equivalents, or in combinations of one or more of them. Implementations of the subject matter described in this specification can be implemented as one or more computer program products, i.e., one or more modules of computer program instructions encoded on a tangible and non-transitory computer readable medium for execution by, or to control the operation of, data processing apparatus.
  • the computer readable medium can be a machine-readable storage device, a machine-readable storage substrate, a memory device, a composition of matter effecting a machine-readable propagated signal, or a combination of one or more of them.
  • data processing unit or “data processing apparatus” encompasses all apparatus, devices, and machines for processing data, including by way of example a programmable processor, a computer, or multiple processors or computers.
  • the apparatus can include, in addition to hardware, code that creates an execution environment for the computer program in question, e.g., code that constitutes processor firmware, a protocol stack, a database management system, an operating system, or a combination of one or more of them.
  • a computer program (also known as a program, software, software application, script, or code) can be written in any form of programming language, including compiled or interpreted languages, and it can be deployed in any form, including as a stand-alone program or as a module, component, subroutine, or other unit suitable for use in a computing environment.
  • a computer program does not necessarily correspond to a file in a file system.
  • a program can be stored in a portion of a file that holds other programs or data (e.g., one or more scripts stored in a markup language document) , in a single file dedicated to the program in question, or in multiple coordinated files (e.g., files that store one or more modules, sub programs, or portions of code) .
  • a computer program can be deployed to be executed on one computer or on multiple computers that are located at one site or distributed across multiple sites and interconnected by a communication network.
  • the processes and logic flows described in this specification can be performed by one or more programmable processors executing one or more computer programs to perform functions by operating on input data and generating output.
  • the processes and logic flows can also be performed by, and apparatus can also be implemented as, special purpose logic circuitry, e.g., an FPGA (field programmable gate array) or an ASIC (application specific integrated circuit) .
  • processors suitable for the execution of a computer program include, by way of example, both general and special purpose microprocessors, and any one or more processors of any kind of digital computer.
  • a processor will receive instructions and data from a read only memory or a random access memory or both.
  • the essential elements of a computer are a processor for performing instructions and one or more memory devices for storing instructions and data.
  • a computer will also include, or be operatively coupled to receive data from or transfer data to, or both, one or more mass storage devices for storing data, e.g., magnetic, magneto optical disks, or optical disks.
  • mass storage devices for storing data, e.g., magnetic, magneto optical disks, or optical disks.
  • a computer need not have such devices.
  • Computer readable media suitable for storing computer program instructions and data include all forms of nonvolatile memory, media and memory devices, including by way of example semiconductor memory devices, e.g., EPROM, EEPROM, and flash memory devices.
  • semiconductor memory devices e.g., EPROM, EEPROM, and flash memory devices.
  • the processor and the memory can be supplemented by, or incorporated in, special purpose logic circuitry.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
PCT/CN2020/085050 2019-04-16 2020-04-16 Matrix derivation in intra coding mode Ceased WO2020211807A1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
JP2021560955A JP7403555B2 (ja) 2019-04-16 2020-04-16 イントラコーディングモードにおけるマトリクスの導出
KR1020217032310A KR102744182B1 (ko) 2019-04-16 2020-04-16 인트라 코딩 모드에서의 행렬 도출
EP20791054.8A EP3939270A4 (en) 2019-04-16 2020-04-16 MATRIX DERIVATION IN AN INTRA CODING MODE
CN202311457029.8A CN117499656A (zh) 2019-04-16 2020-04-16 帧内编解码模式下的矩阵推导
CN202080028965.5A CN113748676B (zh) 2019-04-16 2020-04-16 帧内编解码模式下的矩阵推导
US17/399,879 US11457207B2 (en) 2019-04-16 2021-08-11 Matrix derivation in intra coding mode
US17/895,511 US12375643B2 (en) 2019-04-16 2022-08-25 Matrix derivation in intra coding mode
JP2023150924A JP7612795B2 (ja) 2019-04-16 2023-09-19 イントラコーディングモードにおけるマトリクスの導出
US18/502,636 US12610037B2 (en) 2019-04-16 2023-11-06 Matrix derivation in intra coding mode

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2019082813 2019-04-16
CNPCT/CN2019/082813 2019-04-16

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US17/399,879 Continuation US11457207B2 (en) 2019-04-16 2021-08-11 Matrix derivation in intra coding mode

Publications (1)

Publication Number Publication Date
WO2020211807A1 true WO2020211807A1 (en) 2020-10-22

Family

ID=72838026

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2020/085050 Ceased WO2020211807A1 (en) 2019-04-16 2020-04-16 Matrix derivation in intra coding mode

Country Status (6)

Country Link
US (3) US11457207B2 (https=)
EP (1) EP3939270A4 (https=)
JP (2) JP7403555B2 (https=)
KR (1) KR102744182B1 (https=)
CN (2) CN117499656A (https=)
WO (1) WO2020211807A1 (https=)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022529030A (ja) * 2019-04-17 2022-06-16 華為技術有限公司 行列ベースのイントラ予測と二次変換コア選択を調和させるエンコーダ、デコーダ、および対応する方法
WO2022139912A1 (en) * 2020-12-22 2022-06-30 Tencent America LLC Method and apparatus for video coding for machine
CN116250230A (zh) * 2020-11-05 2023-06-09 阿里巴巴集团控股有限公司 视频编码的、基于偏移的帧内预测细化(orip)
CN117676133A (zh) * 2021-02-22 2024-03-08 Oppo广东移动通信有限公司 帧内预测方法、编码器、解码器以及存储介质

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MX2021012229A (es) 2019-04-12 2021-11-03 Beijing Bytedance Network Tech Co Ltd Determinacion de modo de codificacion de croma basada en intraprediccion basada en matriz.
CN117499656A (zh) 2019-04-16 2024-02-02 北京字节跳动网络技术有限公司 帧内编解码模式下的矩阵推导
EP3949391A4 (en) 2019-05-01 2022-05-25 Beijing Bytedance Network Technology Co., Ltd. MATRIX-BASED INTRAPREDICTION USING FILTRATION
WO2020221372A1 (en) 2019-05-01 2020-11-05 Beijing Bytedance Network Technology Co., Ltd. Context coding for matrix-based intra prediction
KR102698314B1 (ko) 2019-05-22 2024-08-26 베이징 바이트댄스 네트워크 테크놀로지 컴퍼니, 리미티드 업샘플링을 이용한 행렬 기반 인트라 예측
WO2020239017A1 (en) 2019-05-31 2020-12-03 Beijing Bytedance Network Technology Co., Ltd. One-step downsampling process in matrix-based intra prediction
JP2022534320A (ja) 2019-06-05 2022-07-28 北京字節跳動網絡技術有限公司 マトリクスベースイントラ予測のためのコンテキスト決定
TWI737364B (zh) * 2019-06-28 2021-08-21 聯發科技股份有限公司 圖片及視頻處理中的基於矩陣的幀內預測的方法與裝置
CN114556949B (zh) * 2019-08-22 2024-10-25 Lg电子株式会社 帧内预测装置和方法
KR20260003392A (ko) 2019-10-28 2026-01-06 두인 비전 컴퍼니 리미티드 색상 성분에 기초한 신택스 시그널링 및 파싱
US12069305B2 (en) * 2021-04-16 2024-08-20 Tencent America LLC Low memory design for multiple reference line selection scheme
JP7755043B2 (ja) * 2021-08-18 2025-10-15 エルジー エレクトロニクス インコーポレイティド イントラ予測モードに基づいて参照サンプルフィルタリングを行う画像符号化／復号化方法及び装置、並びにビットストリームを伝送する方法
WO2024216125A1 (en) * 2023-04-14 2024-10-17 Bytedance Inc. Method, apparatus, and medium for video processing
CN121399918A (zh) * 2023-06-28 2026-01-23 北京达佳互联信息技术有限公司 用于经滤波的帧内块复制的方法和设备
WO2025242145A1 (en) * 2024-05-22 2025-11-27 Douyin Vision Co., Ltd. Method, apparatus, and medium for video processing

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103503452A (zh) * 2011-05-09 2014-01-08 索尼公司 图像处理装置和图像处理方法
US20150110172A1 (en) * 2013-10-21 2015-04-23 Vid Scale, Inc. Parallel decoding method for layered video coding
US20160330457A1 (en) * 2014-01-02 2016-11-10 Vid Scale, Inc. Color space conversion
CN110708559A (zh) * 2019-09-03 2020-01-17 北京达佳互联信息技术有限公司 图像处理方法、装置及存储介质

Family Cites Families (185)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100323676B1 (ko) 2000-01-27 2002-02-07 구자홍 디지털 동영상 수신 장치
US7142601B2 (en) 2003-04-14 2006-11-28 Mitsubishi Electric Research Laboratories, Inc. Transcoding compressed videos to reducing resolution videos
US8896725B2 (en) 2007-06-21 2014-11-25 Fotonation Limited Image capture device with contemporaneous reference image capture mechanism
JP4017039B2 (ja) 2003-11-18 2007-12-05 シャープ株式会社 照明装置およびそれを備えた表示装置
EP1730846A4 (en) 2004-03-10 2010-02-24 Sindhara Supermedia Inc METHODS AND DEVICES FOR COMPRESSING DIGITAL IMAGE DATA WITH MOTION PREDICTION
US8340177B2 (en) 2004-07-12 2012-12-25 Microsoft Corporation Embedded base layer codec for 3D sub-band coding
CN100461867C (zh) 2004-12-02 2009-02-11 中国科学院计算技术研究所 一种帧内图像预测编码方法
JP2006212185A (ja) 2005-02-03 2006-08-17 Matsushita Electric Ind Co Ltd 生体判別装置および認証装置ならびに生体判別方法
EP1748378B1 (en) 2005-07-26 2009-09-16 Canon Kabushiki Kaisha Image capturing apparatus and image capturing method
US8335484B1 (en) 2005-07-29 2012-12-18 Siport, Inc. Systems and methods for dynamically controlling an analog-to-digital converter
JP5026092B2 (ja) 2007-01-12 2012-09-12 三菱電機株式会社 動画像復号装置および動画像復号方法
KR101365575B1 (ko) 2007-02-05 2014-02-25 삼성전자주식회사 인터 예측 부호화, 복호화 방법 및 장치
KR101433169B1 (ko) 2008-01-03 2014-08-28 경희대학교 산학협력단 인트라 방향성에 따른 모드 예측 및 양자화 매트릭스와스캐닝 적용 방법 및 장치
KR101630871B1 (ko) 2009-01-29 2016-06-16 삼성전자주식회사 인트라 예측 모드 결정 방법 및 장치
CN101848383A (zh) 2009-03-24 2010-09-29 虹软（上海）科技有限公司 对mpeg2格式视频进行降采样解码的方法
US20100246675A1 (en) 2009-03-30 2010-09-30 Sony Corporation Method and apparatus for intra-prediction in a video encoder
US20120069906A1 (en) 2009-06-09 2012-03-22 Kazushi Sato Image processing apparatus and method (as amended)
CN101646081A (zh) 2009-06-18 2010-02-10 杭州高特信息技术有限公司 一种avs快速帧内预测方法及装置
CN102045560B (zh) 2009-10-23 2013-08-07 华为技术有限公司 一种视频编解码方法及设备
KR20110045949A (ko) 2009-10-28 2011-05-04 삼성전자주식회사 회전 변환을 이용한 영상 부호화, 복호화 방법 및 장치
JP5544996B2 (ja) 2010-04-09 2014-07-09 ソニー株式会社 画像処理装置および方法
RU2523071C1 (ru) 2010-04-09 2014-07-20 Мицубиси Электрик Корпорейшн Устройство кодирования движущихся изображений и устройство декодирования движущихся изображений
CA2798231C (en) 2010-05-14 2022-10-04 Thomson Licensing Methods and apparatus for intra coding a block having pixels assigned to groups
WO2012014461A1 (ja) 2010-07-28 2012-02-02 パナソニック株式会社 符号化方法および復号化方法
CN102377993B (zh) 2010-08-05 2014-09-03 富士通株式会社 帧内预测模式选择方法和系统
US8885701B2 (en) 2010-09-08 2014-11-11 Samsung Electronics Co., Ltd. Low complexity transform coding using adaptive DCT/DST for intra-prediction
US8923395B2 (en) 2010-10-01 2014-12-30 Qualcomm Incorporated Video coding using intra-prediction
CN101977316B (zh) 2010-10-27 2012-07-25 无锡中星微电子有限公司 一种可伸缩编码方法
US9167252B2 (en) 2010-12-01 2015-10-20 Texas Instruments Incorporated Quantization matrix compression in video coding
KR102086145B1 (ko) 2010-12-13 2020-03-09 한국전자통신연구원 인트라 예측 방법 및 그 장치
BR112013014371B8 (pt) 2011-01-07 2022-05-24 Hfi Innovation Inc Método e aparelho de codificação aperfeiçoada de modo de predição intra crominância
US8861593B2 (en) 2011-03-15 2014-10-14 Sony Corporation Context adaptation within video coding modules
US9894353B2 (en) 2011-06-13 2018-02-13 Sun Patent Trust Method and apparatus for encoding and decoding video using intra prediction mode dependent adaptive quantization matrix
US9392301B2 (en) 2011-07-01 2016-07-12 Qualcomm Incorporated Context adaptive entropy coding for non-square blocks in video coding
CN102427530B (zh) 2011-10-11 2013-10-23 北京工业大学 帧内预测方法
RS61146B1 (sr) 2011-10-24 2020-12-31 Innotive Ltd Postupak i aparat za dekodiranje slike
KR20130049526A (ko) 2011-11-04 2013-05-14 오수미 복원 블록 생성 방법
US9088796B2 (en) 2011-11-07 2015-07-21 Sharp Kabushiki Kaisha Video decoder with enhanced CABAC decoding
US9451287B2 (en) 2011-11-08 2016-09-20 Qualcomm Incorporated Context reduction for context adaptive binary arithmetic coding
CN107277516B (zh) 2012-02-29 2020-02-18 索尼公司 图像处理设备和方法
JPWO2013154028A1 (ja) * 2012-04-13 2015-12-17 ソニー株式会社 画像処理装置および方法
US20130272391A1 (en) 2012-04-16 2013-10-17 Futurewei Technologies, Inc. Method and Apparatus of Quantization Matrix Coding
US9277211B2 (en) 2012-04-20 2016-03-01 Futurewei Technologies, Inc. Binarization scheme for intra prediction residuals and improved intra prediction in lossless coding in HEVC
GB2501535A (en) 2012-04-26 2013-10-30 Sony Corp Chrominance Processing in High Efficiency Video Codecs
AU2013268588B2 (en) 2012-06-01 2017-03-02 Sharp Kabushiki Kaisha Arithmetic decoding device, image decoding device, arithmetic encoding device, and image encoding device
DK2869557T3 (da) 2012-06-29 2023-11-06 Electronics & Telecommunications Res Inst Fremgangsmåde og anordning til kodning/afkodning af billeder
US9998727B2 (en) 2012-09-19 2018-06-12 Qualcomm Incorporated Advanced inter-view residual prediction in multiview or 3-dimensional video coding
EP2901683A1 (en) 2012-09-28 2015-08-05 VID SCALE, Inc. Adaptive upsampling for multi-layer video coding
US20140098883A1 (en) 2012-10-09 2014-04-10 Nokia Corporation Method and apparatus for video coding
US10147202B2 (en) 2013-03-15 2018-12-04 Arm Limited Methods of and apparatus for encoding and decoding data
US9521425B2 (en) 2013-03-19 2016-12-13 Qualcomm Incorporated Disparity vector derivation in 3D video coding for skip and direct modes
US20140286413A1 (en) 2013-03-25 2014-09-25 Qualcomm Incorporated Disabling sign data hiding in video coding
US20160073107A1 (en) 2013-04-15 2016-03-10 Intellectual Discovery Co., Ltd Method and apparatus for video encoding/decoding using intra prediction
US20150016533A1 (en) 2013-07-12 2015-01-15 Qualcomm Incorporated Intra motion compensation extensions
CN103391443A (zh) 2013-08-05 2013-11-13 深圳市云宙多媒体技术有限公司 一种大尺寸块的亮度变换域帧内预测编解码方法及系统
EP3050301A1 (en) 2013-09-24 2016-08-03 VID SCALE, Inc. Inter-layer prediction for scalable video coding
KR102257269B1 (ko) * 2013-10-14 2021-05-26 마이크로소프트 테크놀로지 라이센싱, 엘엘씨 비디오 및 이미지 코딩 및 디코딩을 위한 인트라 블록 카피 예측 모드의 피쳐
WO2015056955A1 (ko) 2013-10-14 2015-04-23 삼성전자 주식회사 다시점 비디오 부호화 방법 및 장치, 다시점 비디오 복호화 방법 및 장치
US10397607B2 (en) 2013-11-01 2019-08-27 Qualcomm Incorporated Color residual prediction for video coding
MX358758B (es) 2013-12-13 2018-09-04 Vid Scale Inc Dispositivo de codificacion de video escalable de gama de colores y metodo para la alineacion de fase de luminancia y cromaticidad utilizando interpolación.
AU2014376061B8 (en) 2014-01-03 2019-05-30 Microsoft Technology Licensing, Llc Block vector prediction in video and image coding/decoding
WO2015131330A1 (en) 2014-03-04 2015-09-11 Microsoft Technology Licensing, Llc Encoding strategies for adaptive switching of color spaces, color sampling rates and/or bit depths
WO2015131388A1 (en) 2014-03-07 2015-09-11 Qualcomm Incorporated Simplification of depth intra mode coding in 3d video coding
US9549118B2 (en) 2014-03-10 2017-01-17 Qualcomm Incorporated Blink and averted gaze avoidance in photographic images
EP3138293A4 (en) 2014-04-29 2017-05-24 Microsoft Technology Licensing, LLC Encoder-side decisions for sample adaptive offset filtering
AU2014202921B2 (en) 2014-05-29 2017-02-02 Canon Kabushiki Kaisha Method, apparatus and system for de-blocking a block of video samples
US10142642B2 (en) 2014-06-04 2018-11-27 Qualcomm Incorporated Block adaptive color-space conversion coding
US10785486B2 (en) 2014-06-19 2020-09-22 Microsoft Technology Licensing, Llc Unified intra block copy and inter prediction modes
WO2016006894A1 (ko) 2014-07-06 2016-01-14 엘지전자 주식회사 비디오 신호의 처리 방법 및 이를 위한 장치
US9918105B2 (en) 2014-10-07 2018-03-13 Qualcomm Incorporated Intra BC and inter unification
WO2016074147A1 (en) 2014-11-11 2016-05-19 Mediatek Singapore Pte. Ltd. Separated coding tree for luma and chroma
TWI511530B (zh) 2014-12-09 2015-12-01 Univ Nat Kaohsiung 1St Univ Sc Distributed video coding system and decoder for distributed video coding system
US10097839B2 (en) 2014-12-19 2018-10-09 Qualcomm Incorporated Palette mode for subsampling format
US11330284B2 (en) 2015-03-27 2022-05-10 Qualcomm Incorporated Deriving motion information for sub-blocks in video coding
US20180115787A1 (en) 2015-04-12 2018-04-26 Lg Electronics Inc. Method for encoding and decoding video signal, and apparatus therefor
WO2016195460A1 (ko) 2015-06-05 2016-12-08 한양대학교 산학협력단 화면 내 예측에 대한 부호화/복호화 방법 및 장치
WO2016200984A1 (en) 2015-06-08 2016-12-15 Vid Scale, Inc. Intra block copy mode for screen content coding
KR101809630B1 (ko) 2015-06-11 2017-12-15 인텔렉추얼디스커버리 주식회사 적응적인 디블록킹 필터링에 관한 부호화/복호화 방법 및 장치
CN115134609B (zh) 2015-06-11 2025-02-21 杜比实验室特许公司 使用自适应去块滤波编码和解码图像的方法及其装置
EP3310058B1 (en) 2015-06-12 2023-02-22 Panasonic Intellectual Property Management Co., Ltd. Image coding method, image decoding method, image coding device and image decoding device
US10531084B2 (en) 2015-06-15 2020-01-07 Lg Electronics Inc. Intra prediction mode based image processing method, and apparatus therefor
US10841593B2 (en) 2015-06-18 2020-11-17 Qualcomm Incorporated Intra prediction and intra mode coding
US20160373782A1 (en) 2015-06-18 2016-12-22 Qualcomm Incorporated Intra prediction and intra mode coding
US20160373770A1 (en) * 2015-06-18 2016-12-22 Qualcomm Incorporated Intra prediction and intra mode coding
US20160373742A1 (en) 2015-06-18 2016-12-22 Qualcomm Incorporated Intra prediction and intra mode coding
US11463689B2 (en) 2015-06-18 2022-10-04 Qualcomm Incorporated Intra prediction and intra mode coding
US10142627B2 (en) 2015-06-18 2018-11-27 Qualcomm Incorporated Intra prediction and intra mode coding
US11477484B2 (en) 2015-06-22 2022-10-18 Qualcomm Incorporated Video intra prediction using hybrid recursive filters
KR102741824B1 (ko) 2015-07-08 2024-12-11 인터디지털 매디슨 페턴트 홀딩스 에스에이에스 교차 평면 필터링을 이용한 향상된 크로마 코딩
EP3329679A1 (en) 2015-07-28 2018-06-06 VID SCALE, Inc. High dynamic range video coding architectures with multiple operating modes
WO2017041271A1 (en) 2015-09-10 2017-03-16 Mediatek Singapore Pte. Ltd. Efficient context modeling for coding a block of data
CN108353175B (zh) 2015-09-21 2021-03-12 Lg 电子株式会社 使用系数引起的预测处理视频信号的方法和装置
US10681379B2 (en) 2015-09-29 2020-06-09 Qualcomm Incorporated Non-separable secondary transform for video coding with reorganizing
US10750167B2 (en) 2015-10-22 2020-08-18 Lg Electronics, Inc. Intra-prediction method and apparatus in video coding system
JP6626573B2 (ja) 2015-11-02 2019-12-25 ドルビー ラボラトリーズ ライセンシング コーポレイション ハイダイナミックレンジ映像の、ｃｒｃコードを含むレイヤ表現および配信
EP3360329A4 (en) * 2015-11-18 2019-04-10 MediaTek Inc. METHOD AND DEVICE FOR AN INTRAPRADICATION MODE WITH AN INTRAPREDICATION FILTER FOR VIDEO AND IMAGE COMPRESSION
US20170150156A1 (en) 2015-11-25 2017-05-25 Qualcomm Incorporated Illumination compensation with non-square predictive blocks in video coding
US10863207B2 (en) 2015-11-27 2020-12-08 Mediatek Inc. Method and apparatus of entropy coding and context modelling for video and image coding
US10448011B2 (en) 2016-03-18 2019-10-15 Mediatek Inc. Method and apparatus of intra prediction in image and video processing
US10567759B2 (en) 2016-03-21 2020-02-18 Qualcomm Incorporated Using luma information for chroma prediction with separate luma-chroma framework in video coding
ES2688624R1 (es) 2016-04-06 2018-12-04 Kt Corporation Método y aparato para procesar señales de vídeo
CN114339227B (zh) 2016-05-04 2024-04-12 夏普株式会社 用于对变换数据进行编码的系统和方法
JP2019519972A (ja) 2016-05-05 2019-07-11 ヴィド スケール インコーポレイテッド イントラコーディングのための制御点ベースのイントラ方向表現
US10547854B2 (en) 2016-05-13 2020-01-28 Qualcomm Incorporated Neighbor based signaling of intra prediction modes
EP3244614A1 (en) 2016-05-13 2017-11-15 Thomson Licensing A method and a device for decoding an intra predicted block of a picture and corresponding coding method and coding device
US11228770B2 (en) 2016-05-16 2022-01-18 Qualcomm Incorporated Loop sample processing for high dynamic range and wide color gamut video coding
US20190289301A1 (en) 2016-05-23 2019-09-19 Kaonmedia Co., Ltd. Image processing method, and image encoding and decoding method using same
WO2017209328A1 (ko) 2016-06-03 2017-12-07 엘지전자 주식회사 영상 코딩 시스템에서 인트라 예측 방법 및 장치
US10484712B2 (en) 2016-06-08 2019-11-19 Qualcomm Incorporated Implicit coding of reference line index used in intra prediction
US20170374369A1 (en) 2016-06-24 2017-12-28 Mediatek Inc. Methods and Apparatuses of Decoder Side Intra Mode Derivation
CN116708776A (zh) 2016-07-18 2023-09-05 韩国电子通信研究院 图像编码/解码方法和装置以及存储比特流的记录介质
GB2552323B (en) 2016-07-18 2020-04-29 Imagination Tech Ltd Mip map compression
KR102191846B1 (ko) 2016-08-15 2020-12-17 노키아 테크놀로지스 오와이 비디오 인코딩 및 디코딩
US10326986B2 (en) 2016-08-15 2019-06-18 Qualcomm Incorporated Intra video coding using a decoupled tree structure
US10368107B2 (en) 2016-08-15 2019-07-30 Qualcomm Incorporated Intra video coding using a decoupled tree structure
US10721489B2 (en) 2016-09-06 2020-07-21 Qualcomm Incorporated Geometry-based priority for the construction of candidate lists
CN117201776A (zh) 2016-09-13 2023-12-08 韩国电子通信研究院 视频编码/解码方法和装置以及存储比特流的记录介质
EP3301916A1 (en) 2016-09-30 2018-04-04 Thomson Licensing Method and apparatus for omnidirectional video coding with adaptive intra most probable modes
US10958903B2 (en) 2016-10-04 2021-03-23 Electronics And Telecommunications Research Institute Method and apparatus for encoding/decoding image and recording medium storing bit stream
CN109792516B (zh) 2016-10-04 2021-05-25 联发科技股份有限公司 图像和视频编解码中用于帧内色度编解码的方法及装置
US10506228B2 (en) 2016-10-04 2019-12-10 Qualcomm Incorporated Variable number of intra modes for video coding
US11095893B2 (en) 2016-10-12 2021-08-17 Qualcomm Incorporated Primary transform and secondary transform in video coding
WO2018080135A1 (ko) 2016-10-28 2018-05-03 한국전자통신연구원 영상 부호화/복호화 방법, 장치 및 비트스트림을 저장한 기록 매체
US11051033B2 (en) 2017-01-04 2021-06-29 Samsung Electronics Co., Ltd. Video decoding method and apparatus and video encoding method and apparatus
US20180199062A1 (en) * 2017-01-11 2018-07-12 Qualcomm Incorporated Intra prediction techniques for video coding
US11025903B2 (en) 2017-01-13 2021-06-01 Qualcomm Incorporated Coding video data using derived chroma mode
US11102509B2 (en) 2017-04-28 2021-08-24 Electronics And Telecommunications Research Institute Image encoding/decoding method and device, and recording medium storing bit stream
US10638126B2 (en) 2017-05-05 2020-04-28 Qualcomm Incorporated Intra reference filter for video coding
US10609414B2 (en) 2017-05-08 2020-03-31 Qualcomm Incorporated Context modeling for transform coefficient coding
WO2018208349A1 (en) 2017-05-09 2018-11-15 Google Llc Directional intra-prediction coding
US10951908B2 (en) 2017-05-24 2021-03-16 Lg Electronics Inc. Method and device for decoding image according to intra prediction in image coding system
TWI678917B (zh) 2017-06-07 2019-12-01 聯發科技股份有限公司 用於視訊編解碼的畫面內-畫面間預測的方法及裝置
EP3627836A4 (en) 2017-06-21 2021-04-07 LG Electronics Inc. METHOD AND DEVICE FOR DECODING IMAGES ACCORDING TO INTRAPREDICTION IN AN IMAGE ENCODING SYSTEM
CN112601085A (zh) 2017-06-28 2021-04-02 华为技术有限公司 一种图像数据的编码、解码方法及装置
CN117336509A (zh) 2017-07-06 2024-01-02 Lx 半导体科技有限公司 图像编码/解码方法、发送方法和数字存储介质
CN109302608B (zh) 2017-07-25 2021-06-22 华为技术有限公司 图像处理方法、设备及系统
WO2019022099A1 (ja) 2017-07-28 2019-01-31 パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ 符号化装置、復号装置、符号化方法及び復号方法
US11172203B2 (en) 2017-08-08 2021-11-09 Mediatek Inc. Intra merge prediction
US11082721B2 (en) 2017-09-07 2021-08-03 Lg Electronics Inc. Method and apparatus for entropy-encoding and entropy-decoding video signal
US10856010B2 (en) 2017-09-08 2020-12-01 FG Innovation Company Limited Device and method for coding video data based on multiple reference lines
CN107749987B (zh) 2017-09-30 2020-09-18 河海大学 一种基于块运动估计的数字视频稳像方法
JP2021010046A (ja) 2017-10-06 2021-01-28 シャープ株式会社 画像符号化装置及び画像復号装置
CN120455655A (zh) 2017-12-07 2025-08-08 韩国电子通信研究院 用于使用通道之间的选择性信息共享进行编码和解码的方法和设备
WO2019160986A1 (en) 2018-02-14 2019-08-22 Dolby Laboratories Licensing Corporation Image reshaping in video coding using rate distortion optimization
CN111819845B (zh) 2018-03-08 2024-09-03 三星电子株式会社 视频解码方法和装置以及视频编码方法和装置
WO2019194496A1 (ko) 2018-04-01 2019-10-10 엘지전자 주식회사 비디오 신호의 컬러 컴포넌트에 대한 병렬 처리 방법 및 이를 위한 장치
US10284866B1 (en) 2018-07-02 2019-05-07 Tencent America LLC Method and apparatus for video coding
CN112655216B (zh) 2018-07-06 2023-10-24 Lg电子株式会社 基于变换的图像编码方法及装置
KR20200028856A (ko) 2018-09-07 2020-03-17 김기백 인트라 예측을 이용한 영상 부호화/복호화 방법 및 장치
KR102622452B1 (ko) * 2018-09-13 2024-01-09 프라운호퍼 게젤샤프트 쭈르 푀르데룽 데어 안겐반텐 포르슝 에. 베. 아핀 선형 가중 인트라 예측
EP4340356A3 (en) 2018-09-21 2024-05-29 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Image signal encoding/decoding method and apparatus therefor
CN117915085A (zh) 2018-10-07 2024-04-19 三星电子株式会社 用于编码或解码视频信号的视频信号处理方法和设备
ES2986850T3 (es) 2018-11-08 2024-11-12 Guangdong Oppo Mobile Telecommunicationscorp Ltd Método de codificación/decodificación de señales de imagen y dispositivo para el mismo
TWI755665B (zh) * 2018-12-20 2022-02-21 弗勞恩霍夫爾協會 使用具有鄰近取樣縮減的線性或仿射變換的內預測
US11445203B2 (en) 2019-01-04 2022-09-13 Qualcomm Incorporated Sub-partition intra prediction in video coding
CN112425160B (zh) 2019-02-26 2023-05-12 苹果公司 用于对视频信号进行编码/解码的方法及其设备
CN112740677B (zh) 2019-02-28 2024-12-17 苹果公司 用于对图像信号进行编码/解码的方法及其装置
CN113647106B (zh) 2019-03-05 2024-08-13 弗劳恩霍夫应用研究促进协会 混合视频编码工具的用例驱动上下文模型选择
US11418811B2 (en) 2019-03-12 2022-08-16 Apple Inc. Method for encoding/decoding image signal, and device therefor
US11134257B2 (en) 2019-04-04 2021-09-28 Tencent America LLC Simplified signaling method for affine linear weighted intra prediction mode
MX2021012229A (es) 2019-04-12 2021-11-03 Beijing Bytedance Network Tech Co Ltd Determinacion de modo de codificacion de croma basada en intraprediccion basada en matriz.
EP3949414A4 (en) 2019-04-16 2023-04-12 HFI Innovation Inc. Methods and apparatuses for coding video data with adaptive secondary transform signaling
CN117499656A (zh) 2019-04-16 2024-02-02 北京字节跳动网络技术有限公司 帧内编解码模式下的矩阵推导
KR20250069688A (ko) 2019-04-20 2025-05-19 광동 오포 모바일 텔레커뮤니케이션즈 코포레이션 리미티드 Bdpcm에 기반한 영상 코딩 방법 및 그 장치
US11381808B2 (en) 2019-04-25 2022-07-05 Hfi Innovation Inc. Method and apparatus of matrix based intra prediction in image and video processing
CN119277061A (zh) 2019-04-27 2025-01-07 数码士有限公司 基于帧内预测处理视频信号的方法和设备
CN113748677A (zh) * 2019-04-27 2021-12-03 华为技术有限公司 编码器、解码器及对应的帧内预测方法
EP3949391A4 (en) 2019-05-01 2022-05-25 Beijing Bytedance Network Technology Co., Ltd. MATRIX-BASED INTRAPREDICTION USING FILTRATION
WO2020221372A1 (en) * 2019-05-01 2020-11-05 Beijing Bytedance Network Technology Co., Ltd. Context coding for matrix-based intra prediction
US11277637B2 (en) 2019-05-09 2022-03-15 Qualcomm Incorporated Reference sampling for matrix intra prediction mode
US11284093B2 (en) 2019-05-09 2022-03-22 Qualcomm Incorporated Affine linear weighted intra prediction in video coding
US11363284B2 (en) 2019-05-09 2022-06-14 Qualcomm Incorporated Upsampling in affine linear weighted intra prediction
JP7325540B2 (ja) 2019-05-10 2023-08-14 フラウンホーファー－ゲゼルシャフト・ツール・フェルデルング・デル・アンゲヴァンテン・フォルシュング・アインゲトラーゲネル・フェライン ブロックベース予測
US20230057982A1 (en) * 2019-05-15 2023-02-23 Beijing Bytedance Network Technology Co., Ltd. Matrix-based intra prediction using filtering
KR102698314B1 (ko) 2019-05-22 2024-08-26 베이징 바이트댄스 네트워크 테크놀로지 컴퍼니, 리미티드 업샘플링을 이용한 행렬 기반 인트라 예측
WO2020239017A1 (en) 2019-05-31 2020-12-03 Beijing Bytedance Network Technology Co., Ltd. One-step downsampling process in matrix-based intra prediction
JP7379543B2 (ja) 2019-06-03 2023-11-14 エルジー エレクトロニクス インコーポレイティド マトリックスに基づくイントラ予測装置及び方法
JP2022534320A (ja) 2019-06-05 2022-07-28 北京字節跳動網絡技術有限公司 マトリクスベースイントラ予測のためのコンテキスト決定
CN114009044A (zh) * 2019-06-14 2022-02-01 瑞典爱立信有限公司 用于基于矩阵的帧内预测的简化下采样
US11197025B2 (en) * 2019-06-21 2021-12-07 Qualcomm Incorporated Signaling of matrix intra prediction parameters in video coding
SG11202106235VA (en) 2019-06-25 2021-07-29 Guangdong Oppo Mobile Telecommunications Corp Ltd Mapping method, encoder, decoder, and computer storage medium
US11284073B2 (en) 2019-07-08 2022-03-22 Hyundai Motor Company Method and apparatus for intra prediction coding of video data involving matrix based intra-prediction
CN114402614B (zh) * 2019-07-22 2024-08-13 交互数字Vc控股公司 使用基于矩阵的帧内预测进行视频编码和解码的方法和装置
US20210092405A1 (en) 2019-09-19 2021-03-25 Qualcomm Incorporated Matrix combination for matrix-weighted intra prediction in video coding
KR20260003392A (ko) 2019-10-28 2026-01-06 두인 비전 컴퍼니 리미티드 색상 성분에 기초한 신택스 시그널링 및 파싱

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103503452A (zh) * 2011-05-09 2014-01-08 索尼公司 图像处理装置和图像处理方法
US20150110172A1 (en) * 2013-10-21 2015-04-23 Vid Scale, Inc. Parallel decoding method for layered video coding
US20160330457A1 (en) * 2014-01-02 2016-11-10 Vid Scale, Inc. Color space conversion
CN110708559A (zh) * 2019-09-03 2020-01-17 北京达佳互联信息技术有限公司 图像处理方法、装置及存储介质

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
FILIPPOV (HUAWEI) A; RUFITSKIY (HUAWEI) V; WANG (HUAWEI) B; ESENLIK (HUAWEI) S; ALSHINA (HUAWEI) E: "CE3- related: Simplification of Matrix-based Intra Prediction (MIP)", 15TH MEETING, JOINT VIDEO EXPERTS TEAM (JVET) OF ITU-T SG 16 WP 3 AND ISO/IEC JTC 1/SC 29/WG 11 / JVET-O0203 /, 12 July 2019 (2019-07-12), Gothenburg, SE, pages 1, XP030218836 *
JONATHAN PFAFF; BJORN STALLENBERGER; MICHAEL SCHAFER; PHILIPP MERKLE; PHILIPP HELLE; ROMAN RISCHKE; HEIKO SCHWARZ; DETLEV MARPE; T: "CE3: Affine linear weighted intra prediction (test 1.2.1, test 1.2.2)", 13TH MEETING, JOINT VIDEO EXPERTS TEAM (JVET) OF ITU-T SG 16 WP 3 AND 1S0/LEC JTC 1/SC 29/WG 11 /JVET-M0043 /, 18 January 2019 (2019-01-18), Marrakech, MA, pages 3 - 6, XP030197764 *
PFAFF (FRAUNHOFER) J ET AL.: "CE3 Affine linear weighted intra prediction (CE3-4.1, CE3-4.2", JVET MEETING, vol. 14, 19 March 2019 (2019-03-19)
PFAFF (FRAUNHOFER) J ET AL.: "CE3: Affine linear weighted intra prediction (CE3-4.1, CE3-4.2", MPEG MEETING, vol. 126, 25 March 2019 (2019-03-25)
See also references of EP3939270A4
WANG (HUAWEI) B ET AL.: "CE3-related: A unified MPM list for intra mode coding", JVET MEETING, vol. 14, 19 March 2019 (2019-03-19)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022529030A (ja) * 2019-04-17 2022-06-16 華為技術有限公司 行列ベースのイントラ予測と二次変換コア選択を調和させるエンコーダ、デコーダ、および対応する方法
JP7366149B2 (ja) 2019-04-17 2023-10-20 華為技術有限公司 行列ベースのイントラ予測と二次変換コア選択を調和させるエンコーダ、デコーダ、および対応する方法
JP2023157955A (ja) * 2019-04-17 2023-10-26 華為技術有限公司 行列ベースのイントラ予測と二次変換コア選択を調和させるエンコーダ、デコーダ、および対応する方法
JP7571227B2 (ja) 2019-04-17 2024-10-22 華為技術有限公司 行列ベースのイントラ予測と二次変換コア選択を調和させるエンコーダ、デコーダ、および対応する方法
JP2025010162A (ja) * 2019-04-17 2025-01-20 華為技術有限公司 行列ベースのイントラ予測と二次変換コア選択を調和させるエンコーダ、デコーダ、および対応する方法
CN116250230A (zh) * 2020-11-05 2023-06-09 阿里巴巴集团控股有限公司 视频编码的、基于偏移的帧内预测细化(orip)
WO2022139912A1 (en) * 2020-12-22 2022-06-30 Tencent America LLC Method and apparatus for video coding for machine
CN117676133A (zh) * 2021-02-22 2024-03-08 Oppo广东移动通信有限公司 帧内预测方法、编码器、解码器以及存储介质
EP4297406A4 (en) * 2021-02-22 2024-12-04 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Intra-frame prediction method, coder, decoder and storage medium
CN117676133B (zh) * 2021-02-22 2025-09-26 Oppo广东移动通信有限公司 帧内预测方法、编码器、解码器以及存储介质

Also Published As

Publication number Publication date
EP3939270A1 (en) 2022-01-19
JP2022529432A (ja) 2022-06-22
US20210385438A1 (en) 2021-12-09
KR20210145757A (ko) 2021-12-02
JP7403555B2 (ja) 2023-12-22
US20220417503A1 (en) 2022-12-29
JP7612795B2 (ja) 2025-01-14
JP2023169300A (ja) 2023-11-29
CN117499656A (zh) 2024-02-02
CN113748676A (zh) 2021-12-03
US12375643B2 (en) 2025-07-29
KR102744182B1 (ko) 2024-12-19
US20240080441A1 (en) 2024-03-07
CN113748676B (zh) 2024-05-10
US11457207B2 (en) 2022-09-27
US12610037B2 (en) 2026-04-21
EP3939270A4 (en) 2022-05-11

Similar Documents

Publication Publication Date Title
US11831877B2 (en) Calculation in matrix-based intra prediction
US12375643B2 (en) Matrix derivation in intra coding mode
US11659185B2 (en) Matrix-based intra prediction using upsampling
WO2020239017A1 (en) One-step downsampling process in matrix-based intra prediction
US11463729B2 (en) Matrix-based intra prediction using filtering
US11546633B2 (en) Context coding for matrix-based intra prediction
WO2020244610A1 (en) Context determination for matrix-based intra prediction

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20791054

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 20217032310

Country of ref document: KR

Kind code of ref document: A

ENP Entry into the national phase

Ref document number: 2021560955

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2020791054

Country of ref document: EP

Effective date: 20211012