# US 2023/0055162 A1 · Method and apparatus for encoding/decoding video > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0055162 A1 - Document ID: US20230055162A1 - Status: Published application - Kind: A1 - Application number: 17/969,912 - Filed: 2022-10-20 - Published: 2023-02-23 - Earliest claimed: 2018-04-09 - Assignees: SK Telecom Co., Ltd. - Applicants: SK Telecom Co., Ltd. - Inventors: Jeong-yeon LIM; Jae Seob SHIN; Sun Young LEE; Se Hoon SON; Tae Young NA; Jae Il KIM - Web page: https://patentgrep.com/patent/US20230055162A1 ## CPC - H04N 19/597: specially adapted for multi-view video sequence encoding - H04N 19/70: characterised by syntax aspects related to video coding, e.g. related to compression standards - H04N 19/119: Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks - H04N 19/174: the region being a slice, e.g. a line of blocks or a group of blocks - H04N 19/436: using parallelised computational arrangements - H04N 19/513: Processing of motion vectors - H04N 19/55: Motion estimation with spatial constraints, e.g. at image or region borders - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract Disclosed is a method and apparatus for encoding/decoding a video. According to an embodiment, provided is a method of setting a level for each of one or more regions, including decoding a definition syntax element related to level definition and a designation syntax element related to target designation from a bitstream; defining one or more levels based on the definition syntax element; and setting a target level designated by the designation syntax element among the defined levels for a target region designated by the designation syntax element. ## Claims ### Claim 1 An apparatus for decoding, from an SEI (supplemental enhancement information) message of a bitstream, level information for each of a plurality of regions partitioned from each of pictures included in a video sequence, the level information being information for defining a level of decoding capability of the apparatus including maximum resolution up to which the apparatus is processible, the apparatus comprising a processor configured to: decode default level information for defining at least one default level; decode a first flag indicating whether extra information is defined, wherein the extra information is associated with the default level information, and is used for setting a level corresponding to the region; decode the extra information depending on the flag; and set the level corresponding to the region using the default level information and the extra information. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the default level information represents the at least one default level applicable to the pictures included in the video sequence, wherein the extra information include: number information for representing the number of extra levels applicable to the region, and as many extra level syntax elements as the number of extra levels, the extra level syntax elements representing the extra levels respectively. ### Claim 3 (depends on 2) The apparatus of claim 2, wherein the processor is configured to: decode one or more designation syntax elements for selecting one among the at least one default level and the extra levels, from a header in which syntax elements related to the region are included, and set the level corresponding to the region among the at least one default level and the extra levels using the one or more designation syntax elements. ### Claim 4 (depends on 3) The apparatus of claim 3, wherein one or more designation syntax elements include: a second flag for indicating whether the at least one default level is applied to the region, and an indicator which indicates one among the extra levels and is decoded when the second flag indicates that the at least one default level is not applied. ### Claim 5 (depends on 4) The apparatus of claim 4, wherein the processor is configured to: set the level corresponding to the region to an extra level indicated by the indicator among the extra levels when the second flag indicates that the at least one default level is not applied, and set the level corresponding to the region to the at least one default level when the second flag indicates that the at least one default level is applied. ### Claim 6 (depends on 2) The apparatus of claim 2, wherein the default level information is decoded from a header of the video sequence, and the extra information is decoded from a header of a picture level. ### Claim 7 A video encoding apparatus for encoding, into an SEI (supplemental enhancement information) message of a bitstream, level information for each of a plurality of regions partitioned from each of pictures included in a video sequence, the level information being information for defining a level of decoding capability of a video decoding apparatus including maximum resolution up to which the video decoding apparatus is processible, the video encoding apparatus comprising a processor configured to: encode default level information for defining at least one default level; encode a first flag indicating whether extra information is defined, wherein the extra information is associated with the default level information, and is used for setting a level corresponding to the region; depending on the flag, encode the extra information such that the video decoding apparatus sets the level corresponding to the region using the default level information and the extra information. ### Claim 8 (depends on 7) The video encoding apparatus of claim 7, wherein the default level information represents the at least one default level applicable to the pictures included in the video sequence, wherein the extra information include: number information for representing the number of extra levels applicable to the region, and as many extra level syntax elements as the number of extra levels, the extra level syntax elements representing the extra levels respectively. ### Claim 9 (depends on 8) The video encoding apparatus of claim 8, wherein the processor is configured to: encode one or more designation syntax elements for selecting one among the at least one default level and the extra levels, in a header in which syntax elements related to the region are included. ### Claim 10 (depends on 9) The video encoding apparatus of claim 9, wherein one or more designation syntax elements include: a second flag for indicating whether the at least one default level is applied to the region, and an indicator which indicates one among the extra levels and is encoded when the second flag indicates that the at least one default level is not applied. ### Claim 11 (depends on 8) The video encoding apparatus of claim 8, wherein the default level information is encoded in a header of the video sequence, and the extra information is encoded in a header of a picture level. ### Claim 12 A non-transitory recording medium storing a bitstream generated by encoding, into an SEI (supplemental enhancement information) message, level information for each of a plurality of regions partitioned from each of pictures included in a video sequence, the level information being information for defining a level of decoding capability of the apparatus including maximum resolution up to which the apparatus is processible, the encoding of the level information comprising: encoding default level information for defining at least one default level; encoding a first flag indicating whether extra information is defined, wherein the extra information is associated with the default level information, and is used for setting a level corresponding to the region; and depending on the flag, encode the extra information such that a video decoding apparatus sets the level corresponding to the region using the default level information and the extra information.