# US 2023/0057053 A1 · Method and device for signaling video information applicable at picture level or slice level > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0057053 A1 - Document ID: US20230057053A1 - Status: Published application - Kind: A1 - Application number: 17/784,322 - Filed: 2020-12-10 - Published: 2023-02-23 - Earliest claimed: 2019-12-12 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Hendry Hendry; Seunghwan Kim - Web page: https://patentgrep.com/patent/US20230057053A1 ## CPC - H04N 19/136: Incoming video signal characteristics or properties - H04N 19/174: the region being a slice, e.g. a line of blocks or a group of blocks - H04N 19/172: the region being a picture, frame or field - H04N 19/176: the region being a block, e.g. a macroblock - H04N 19/46: Embedding additional information in the video signal during the compression process (H04N19/517, H04N19/68, H04N19/70 take precedence) - H04N 19/70: characterised by syntax aspects related to video coding, e.g. related to compression standards - H04N 19/82: involving filtering within a prediction loop - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A video decoding method performed by a decoding device according to the present disclosure comprises the steps of: acquiring indication information indicating whether one or more tools for the current block can be applied at a picture level or slice level; determining, on the basis of the indication information, whether information related to the one or more tools is present in a picture header or a slice header; parsing the information related to the one or more tools from the picture header or the slice header on the basis of the determination result; and decoding the current block on the basis of the information related to the one or more tools. ## Claims ### Claim 1 An image decoding method performed by a decoding apparatus, the method comprising: obtaining indication information indicating whether at least one tool for a current block is applied at a picture level or a slice level; determining in which header among a picture header and a slice header information related to the at least one tool is present; parsing the information related to the at least one tool from the picture header or the slice header based on the determination; and decoding the current block based on the information related to the at least one tool, wherein the indication information is included in a Picture Parameter Set (PPS). ### Claim 2 (canceled) ### Claim 3 (depends on 1) The image decoding method of claim 1, wherein the indication information includes a first flag indicating whether signaling of a reference picture list is applied at a picture level or a slice level, wherein based on a case that a value of the first flag is equal to 1, information related to the signaling of the reference picture list is present in the picture header, and wherein based on a case that the value of the first flag is equal to 0, the information related to the signaling of the reference picture list is present in the slice header. ### Claim 4 (depends on 1) The image decoding method of claim 1, wherein the indication information includes a second flag indicating whether a Sample Adaptive Offset (SAO) procedure is applied at a picture level or a slice level, wherein based on a case that a value of the second flag is equal to 1, information related to the SAO procedure is present in the picture header, and wherein based on a case that the value of the second flag is equal to 0, the information related to the SAO procedure is present in the slice header. ### Claim 5 (depends on 1) The image decoding method of claim 1, wherein the indication information includes a third flag indicating whether an Adaptive Loop Filter (ALF) procedure is applied at a picture level or a slice level, wherein based on a case that a value of the third flag is equal to 1, information related to the ALF procedure is present in the picture header, and wherein based on a case that the value of the third flag is equal to 0, the information related to the ALF procedure is present in the slice header. ### Claim 6 (canceled) ### Claim 7 (canceled) ### Claim 8 An image encoding method performed by an encoding apparatus, the method comprising: generating indication information indicating whether at least one tool that is to be applied to a current block is applied at a picture level or a slice level; generating information related to the at least one tool; and encoding image information including the indication information and the information related to the at least one tool, wherein the indication information indicates in which header among a picture header and a slice header the information related to the at least one tool is present, and wherein the indication information is included in a Picture Parameter Set (PPS). ### Claim 9 (canceled) ### Claim 10 (depends on 8) The image encoding method of claim 8, wherein the indication information includes a first flag indicating whether signaling of a reference picture list is applied at a picture level or a slice level, wherein based on a case that a value of the first flag is equal to 1, information related to the signaling of the reference picture list is present in the picture header, and wherein based on a case that the value of the first flag is equal to 0, the information related to the signaling of the reference picture list is present in the slice header. ### Claim 11 (depends on 8) The image encoding method of claim 8, wherein the indication information includes a second flag indicating whether a Sample Adaptive Offset (SAO) procedure is applied at a picture level or a slice level, wherein based on a case that a value of the second flag is equal to 1, information related to the SAO procedure is present in the picture header, and wherein based on a case that the value of the second flag is equal to 0, the information related to the SAO procedure is present in the slice header. ### Claim 12 (depends on 8) The image encoding method of claim 8, wherein the indication information includes a third flag indicating whether an Adaptive Loop Filter (ALF) procedure is applied at a picture level or a slice level, wherein based on a case that a value of the third flag is equal to 1, information related to the ALF procedure is present in the picture header, and wherein based on a case that the value of the third flag is equal to 0, the information related to the ALF procedure is present in the slice header. ### Claim 13 (canceled) ### Claim 14 (canceled) ### Claim 15 (canceled) ### Claim 16 (depends on 1) The image decoding method of claim 1, wherein based on a case that the information related to the at least one tool is determined to present in the picture header, the information related to the at least one tool is not present in slice header, and wherein based on a case that the information related to the at least one tool is determined to present in the slice header, the information related to the at least one tool is not present in picture header. ### Claim 17 (depends on 1) The image decoding method of claim 1, wherein the indication information includes deblocking related flag information related to whether deblocking filter information is present in one of the picture header or the slice header. ### Claim 18 (depends on 17) The image decoding method of claim 17, wherein based on the deblocking related flag information, the deblocking filter information is present in the picture header, and wherein based a case that the deblocking filter information is included in the picture header, the deblocking filter information is not included in the slice header. ### Claim 19 (depends on 17) The image decoding method of claim 17, wherein based on the deblocking related flag information, the deblocking filter information is present in the slice header, and wherein based a case that the deblocking filter information is included in the slice header, the deblocking filter information is not included in the picture header. ### Claim 20 (depends on 8) The image encoding method of claim 8, wherein the indication information includes deblocking related flag information related to whether deblocking filter information is present in one of the picture header or the slice header. ### Claim 21 (depends on 20) The image encoding method of claim 20, wherein based on the deblocking related flag information, the deblocking filter information is present in the picture header, and wherein based a case that the deblocking filter information is included in the picture header, the deblocking filter information is not included in the slice header. ### Claim 22 (depends on 20) The image encoding method of claim 20, wherein based on the deblocking related flag information, the deblocking filter information is present in the slice header, and wherein based a case that the deblocking filter information is included in the slice header, the deblocking filter information is not included in the picture header. ### Claim 23 A non-transitory computer readable storage medium storing a bitstream generated by a method, the method comprising: generating indication information indicating whether at least one tool that is to be applied to a current block is applied at a picture level or a slice level; generating information related to the at least one tool; and generating the bitstream by encoding image information including the indication information and the information related to the at least one tool, wherein the indication information indicates in which header among a picture header and a slice header the information related to the at least one tool is present, and wherein the indication information is included in a Picture Parameter Set (PPS).