# US 2021/0243445 A1 · Encoding and decoding a video > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0243445 A1 - Document ID: US20210243445A1 - Status: Published application - Kind: A1 - Application number: 17/051,682 - Filed: 2019-04-24 - Published: 2021-08-05 - Earliest claimed: 2018-05-02 - Assignees: InterDigital VC Holdings, Inc. - Applicants: InterDigital VC Holdings, Inc. - Inventors: Fabrice LELEANNEC; Tangi POIRIER; Ya CHEN - Web page: https://patentgrep.com/patent/US20210243445A1 ## CPC - H04N 19/122: Selection of transform size, e.g. 8x8 or 2x4x8 DCT; Selection of sub-band transforms of varying structure or type - H04N 19/129: Scanning of coding units, e.g. zig-zag scan of transform coefficients or flexible macroblock ordering [FMO] - H04N 19/159: Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction - H04N 19/176: the region being a block, e.g. a macroblock - H04N 19/18: the unit being a set of transform coefficients - H04N 19/119: Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A method and an apparatus for coding a video are disclosed. At least one transform subblock in a block of a picture of the video is determined (1600) depending on a shape of the block and the block is coded (1630) based at least on the determined transform subblock. Corresponding decoding method and apparatus are disclosed. ## Claims ### Claim at position 1 1-13. (canceled) ### Claim 14 A method for coding a video comprising: determining at least one transform subblock in a block of a picture of the video; coding said block based at least on said at least one transform subblock; wherein in case said block has a size of 2×N coefficients, with N being an integer, N is a multiple of 8, and N being greater than 8, wherein at least one transform subblock is a 2×8 subblock; or wherein said block has a size of N×2 coefficients, with N being an integer, N is a multiple of 8, and N being greater than 8, wherein at least one transform subblock is a 8×2 subblock. ### Claim 15 (depends on 14) The method of claim 14, wherein determining at least one transform subblock in a block of said picture is further based on an intra prediction mode used for predicting said block. ### Claim 16 (depends on 15) The method of claim 15, wherein if said block is predicted according to an horizontal intra prediction mode, the method further comprises determining a parsing order of transform coefficients of said block wherein said parsing order is a vertical bottom-up right to left parsing starting at a bottom right coefficient in said block. ### Claim 17 (depends on 15) The method of claim 15, wherein if said block is predicted according to a vertical intra prediction mode, the method further comprises determining a parsing order of transform coefficients of said block wherein said parsing order is an horizontal right to left bottom-up parsing starting at a bottom right coefficient in said block. ### Claim 18 A method for decoding a video comprising: determining at least one transform subblock in a block of a picture of the video, decoding said block based at least on said at least one transform subblock, wherein in case said block has a size of 2×N coefficients, with N being an integer, N is a multiple of 8, and N being greater than 8, at least one transform subblock is a 2×8 subblock; or wherein in case said block has a size of N×2 coefficients, with N being an integer, N is a multiple of 8, and N being greater than 8, at least one transform subblock is a 8×2 subblock. ### Claim 19 (depends on 18) The method of claim 18, wherein determining at least one transform subblock in a block of said picture is further based on an intra prediction mode used for predicting said block. ### Claim 20 (depends on 19) The method of claim 19, wherein if said block is predicted according to an horizontal intra prediction mode, the method further comprises determining a parsing order of transform coefficients of said block wherein said parsing order is a vertical bottom-up right to left parsing starting at a bottom right coefficient in said block. ### Claim 21 (depends on 19) The method of claim 19, wherein if said block is predicted according to a vertical intra prediction mode, the method further comprises determining a parsing order of transform coefficients of said block wherein said parsing order is an horizontal right to left bottom-up parsing starting at a bottom right coefficient in said block. ### Claim 22 An apparatus for coding a video comprising a memory and one or more processors configured to: determine at least one transform subblock in a block of a picture of the video, code said block based at least on said at least one transform subblock, wherein in case said block has a size of 2×N coefficients, with N being an integer, N is a multiple of 8, and N being greater than 8, at least one transform subblock is a 2×8 subblock; or wherein in case said block has a size of N×2 coefficients, with N being an integer, N is a multiple of 8, and N being greater than 8, at least one transform subblock is a 8×2 subblock. ### Claim 23 (depends on 22) The apparatus of claim 22, wherein at least one transform subblock in a block of said picture is further determined based on an intra prediction mode used for predicting said block. ### Claim 24 (depends on 23) The apparatus of claim 23, wherein if said block is predicted according to an horizontal intra prediction mode, a parsing order of transform coefficients of said block is further determined wherein said parsing order is a vertical bottom-up right to left parsing starting at a bottom right coefficient in said block. ### Claim 25 (depends on 23) The apparatus of claim 23, wherein if said block is predicted according to a vertical intra prediction mode, a parsing order of transform coefficients of said block is further determined wherein said parsing order is an horizontal right to left bottom-up parsing starting at a bottom right coefficient in said block. ### Claim 26 An apparatus for decoding a video comprising a memory and one or more processors configured to: determine at least one transform subblock in a block of a picture of the video, decode said block based at least on said at least one transform subblock, wherein said block has a size of 2×N coefficients, with N being an integer, N is a multiple of 8, and N being greater than 8, at least one transform subblock is a 2×8 subblock; or wherein said block has a size of N×2 coefficients, with N being an integer, N is a multiple of 8, and N being greater than 8, at least one transform subblock is a 8×2 subblock. ### Claim 27 (depends on 26) The apparatus of claim 26, wherein at least one transform subblock in a block of said picture is further determined based on an intra prediction mode used for predicting said block. ### Claim 28 (depends on 27) The apparatus of claim 27, wherein if said block is predicted according to an horizontal intra prediction mode, a parsing order of transform coefficients of said block is further determined wherein said parsing order is a vertical bottom-up right to left parsing starting at a bottom right coefficient in said block. ### Claim 29 (depends on 27) The apparatus of claim 27, wherein if said block is predicted according to a vertical intra prediction mode, a parsing order of transform coefficients of said block is further determined wherein said parsing order is an horizontal right to left bottom-up parsing starting at a bottom right coefficient in said block. ### Claim 30 (depends on 14) A non-transitory program storage device, readable by a computer, tangibly embodying a program of instructions executable by the computer for performing the method according to claim 14. ### Claim 31 (depends on 18) A non-transitory program storage device, readable by a computer, tangibly embodying a program of instructions executable by the computer for performing the method according to claim 18. ### Claim 32 A non-transitory program storage device having encoded data representative of a block in a picture of a video, the encoded data comprising at least one transform subblock of the block; and wherein in case said block has a size of 2×N coefficients, with N being an integer, N is a multiple of 8, and N being greater than 8, at least one transform subblock is a 2×8 subblock; or in case said block has a size of N×2 coefficients, with N being an integer, N is a multiple of 8, and N being greater than 8, at least one transform subblock is a 8×2 subblock. ### Claim 33 A method for transmitting encoded data representative of the block of a picture of a video, the method comprising: transmitting encoded data for which at least one transform subblock of the block is determined; and wherein in case said block has a size of 2×N coefficients, with N being an integer, N is a multiple of 8, and N being greater than 8, at least one transform subblock is a 2×8 subblock; or in case said block has a size of N×2 coefficients, with N being an integer, N is a multiple of 8, and N being greater than 8, at least one transform subblock is a 8×2 subblock. ### Claim 34 An apparatus for transmitting encoded data representative of the block of a picture of a video comprising a memory and one or more processors configured to: transmit encoded data for which at least one transform subblock of the block is determined; and wherein in case said block has a size of 2×N coefficients, with N being an integer, N is a multiple of 8, and N being greater than 8, at least one transform subblock is a 2×8 subblock; or in case said block has a size of N×2 coefficients, with N being an integer, N is a multiple of 8, and N being greater than 8, at least one transform subblock is a 8×2 subblock. ### Claim 35 A method for receiving encoded data representative of the block of a picture of a video, the method comprising: receiving encoded data for which at least one transform subblock of the block is determined; and wherein in case said block has a size of 2×N coefficients, with N being an integer, N is a multiple of 8, and N being greater than 8, at least one transform subblock is a 2×8 subblock; or in case said block has a size of N×2 coefficients, with N being an integer, N is a multiple of 8, and N being greater than 8, at least one transform subblock is a 8×2 subblock. ### Claim 36 An apparatus for receiving encoded data representative of the block of a picture of a video comprising a memory and one or more processors configured to: receiving encoded data for which at least one transform subblock in the block is determined; and wherein in case said block has a size of 2×N coefficients, with N being an integer, N is a multiple of 8, and N being greater than 8, at least one transform subblock is a 2×8 subblock; or in case said block has a size of N×2 coefficients, with N being an integer, N is a multiple of 8, and N being greater than 8, at least one transform subblock is a 8×2 subblock.