# US 12,192,516 B2 · Video encoding and decoding method and apparatus using selective subblock split information signaling > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,192,516 B2 - Document ID: US12192516B2 - Status: Granted - Kind: B2 - Application number: 18/198,061 - Filed: 2023-05-16 - Published: 2023-09-14 - Granted: 2025-01-07 - Earliest claimed: 2020-11-23 - Assignees: Hyundai Motor Company; Kia Corporation; Research & Business Foundation Sungkyunkwan University - Applicants: Hyundai Motor Company; Kia Corporation; Research & Business Foundation Sungkyunkwan University - Inventors: Byeung Woo Jeon; Jee Yoon Park; Bum Yoon Kim; Seung Wook Park - Web page: https://patentgrep.com/patent/US12192516B2 ## CPC - H04N 19/119: Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks - H04N 19/593: involving spatial prediction techniques - H04N 19/103: Selection of coding mode or of prediction mode - H04N 19/105: 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 - 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 19/70: characterised by syntax aspects related to video coding, e.g. related to compression standards - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract Disclosed is a video encoding/decoding method and an apparatus using selective transmission of subblock partitioning information. The video encoding/decoding method and apparatus selectively encode and decode the splitting direction of a subblock to reduce the overhead of signal transmission for using subblock partitioning while effectively performing intra prediction per subblock basis. ## Claims ### Claim 1 An intra prediction method for applying an intra prediction mode of a current block to subblocks obtained by splitting the current block performed by a video decoding apparatus, the method comprising: decoding the size and an intra prediction mode of the current block; generating a pre-prunable range of the subblocks based on the size of the current block and the number of partitioned subblocks, wherein the pre-prunable range includes a vertical pre-prunable range and a horizontal pre-prunable range and represents a set of intra prediction directions in which constructed samples of newly reconstructed neighboring subblocks are not used by the subblocks when prediction is performed; and setting a splitting direction of the subblocks according to whether the intra prediction mode is included in the vertical pre-prunable range or the horizontal pre-prunable range. ### Claim 2 (depends on 1) The method of claim 1, wherein generating the pre-prunable range comprises determining the number of the partitioned sub blocks according to the size of the current block or using the predecoded number of subblocks. ### Claim 3 (depends on 1) The method of claim 1, wherein setting the splitting direction comprises setting the splitting direction of the subblocks to horizontal direction when the intra prediction mode is included in the vertical pre-prunable range. ### Claim 4 (depends on 1) The method of claim 1, wherein setting the splitting direction comprises setting the splitting direction of the subblocks to vertical direction when the intra prediction mode is included in the horizontal pre-prunable range. ### Claim 5 (depends on 1) The method of claim 1, wherein, when the intra prediction mode is not included in the pre-prunable range, setting the splitting direction comprises setting the splitting direction of the subblocks according to a subblock splitting direction flag after decoding the subblock splitting direction flag indicating the splitting direction of the sub blocks. ### Claim 6 (depends on 1) The method of claim 1, wherein the vertical pre-prunable range includes values greater than a prediction direction corresponding to the top left diagonal line of subblocks partitioned in the vertical direction. ### Claim 7 (depends on 1) The method of claim 1, wherein the horizontal pre-prunable range includes values smaller than a prediction direction corresponding to the top left diagonal line of subblocks partitioned in the horizontal direction. ### Claim 8 An intra prediction method for applying an intra prediction mode of a current block to subblocks obtained by splitting the current block performed by a video encoding apparatus, the method comprising: obtaining the size and an intra prediction mode of the current block; generating a pre-prunable range of the subblocks based on the size of the current block, wherein the pre-prunable range includes a vertical pre-prunable range and a horizontal pre-prunable range and represents a set of intra prediction directions in which constructed samples of newly reconstructed neighboring subblocks are not used by the subblocks when prediction is performed; and setting a splitting direction of the sub blocks according to whether the intra prediction mode is included in the vertical pre-prunable range or the horizontal pre-prunable range. ### Claim 9 (depends on 8) The method of claim 8, wherein generating the pre-prunable range comprises determining the number of the partitioned sub blocks according to the size of the current block or using the number of sub blocks obtained previously. ### Claim 10 (depends on 8) The method of claim 8, wherein, when the intra prediction mode is included in the vertical pre-prunable range, setting the splitting direction comprises setting the splitting direction of the subblock to horizontal direction and not generating a subblock splitting direction flag indicating a splitting direction of the subblocks. ### Claim 11 (depends on 8) The method of claim 8, wherein, when the intra prediction mode is included in the horizontal pre-prunable range, setting the splitting direction comprises setting the splitting direction of the subblock to vertical direction and not generating a subblock splitting direction flag indicating a splitting direction of the sub blocks. ### Claim 12 (depends on 8) The method of claim 8, wherein, when the intra prediction mode is not included in the pre-prunable range, setting the splitting direction comprises: generating coding efficiency according to horizontal and vertical splitting of the current block; and setting a subblock splitting direction indicating the splitting direction of the subblocks based on the coding efficiency. ### Claim 13 A non-transitory computer-readable recording medium storing a bitstream generated by a video encoding method for applying an intra prediction mode of a current block to subblocks obtained by splitting the current block, wherein the method comprises: obtaining the size and an intra prediction mode of the current block; generating a pre-prunable range of the subblocks based on the size of the current block, wherein the pre-prunable range includes a vertical pre-prunable range and a horizontal pre-prunable range and represents a set of intra prediction directions in which constructed samples of newly reconstructed neighboring subblocks are not used by the subblocks when prediction is performed; and setting a splitting direction of the subblocks according to whether the intra prediction mode is included in the vertical pre-prunable range or the horizontal pre-prunable range.