# US 2014/0192897 A1 · Gradual decoding refresh with temporal scalability support in video coding > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0192897 A1 - Document ID: US20140192897A1 - Status: Published application - Kind: A1 - Application number: 14/148,000 - Filed: 2014-01-06 - Published: 2014-07-10 - Earliest claimed: 2013-01-07 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Ye-Kui Wang; Adarsh Krishnan Ramasubramonian - Web page: https://patentgrep.com/patent/US20140192897A1 ## CPC - H04N 19/44: Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder - H04N 19/107: between spatial and temporal predictive coding, e.g. picture refresh - H04N 19/31: in the temporal domain - H04N 19/70: characterised by syntax aspects related to video coding, e.g. related to compression standards - H04N 19/46: Embedding additional information in the video signal during the compression process (H04N19/517, H04N19/68, H04N19/70 take precedence) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract An example method of decoding video data includes receiving, in a message associated with a picture, information indicating a refreshed region of the picture, determining whether the picture comprises a last picture in a gradual decoder refresh (GDR) set, determining whether the picture comprises a recovery point picture, and responsive to determining that the picture comprises the last picture in the GDR set and the recovery point picture, determining that the message indicates that the entire picture belongs to the refreshed region of the picture. ## Claims ### Claim 1 A method of decoding video data, the method comprising: receiving from an encoded video bitstream a message associated with a picture, the message comprising information indicating a refreshed region of the picture; determining whether the picture comprises a last picture in a gradual decoder refresh (GDR) set; determining whether the picture comprises a recovery point picture; responsive to determining that the picture comprises the last picture in the GDR set and the recovery point picture, determining that the message indicates that the entire picture belongs to the refreshed region of the picture; and decoding the picture based on the determination that the message indicates that the entire picture belongs the refreshed region of the picture. ### Claim 2 (depends on 1) The method of claim 1, wherein the message comprises a supplemental enhancement information (SEI) message. ### Claim 3 (depends on 2) The method of claim 2, wherein the SEI message comprises a region refresh SEI message. ### Claim 4 (depends on 3) The method of claim 3, wherein determining that the message indicates that the entire picture belongs to the refreshed region of the picture comprises determining that a refreshed_region_flag syntax element associated with the region refresh SEI message has a value of 1. ### Claim 5 (depends on 4) The method of claim 4, wherein the refreshed_region_flag syntax element is associated with a first slice segment of an access unit (AU) that includes the picture, and wherein determining that the entire picture belongs to the refreshed region further comprises determining that each slice segment of the AU different from the first slice segment of the AU is associated with a corresponding refreshed_region_flag syntax element. ### Claim 6 A device for decoding video data, the device comprising: a memory configured to store encoded video data; and a video coder configured to: receive from an encoded video bitstream a message associated with a picture of the encoded video data, the message comprising information indicating a refreshed region of the picture; determine whether the picture comprises a last picture in a gradual decoder refresh (GDR) set; determine whether the picture comprises a recovery point picture; responsive to the determination that the picture comprises the last picture in the GDR set and the recovery point picture, determine that the message indicates that the entire picture belongs to the refreshed region of the picture; and decode the picture based on the determination that the message indicates that the entire picture belongs the refreshed region of the picture. ### Claim 7 (depends on 6) The device of claim 6, wherein the message comprises a supplemental enhancement information (SEI) message. ### Claim 8 (depends on 7) The device of claim 7, wherein the SEI message comprises a region refresh SEI message. ### Claim 9 (depends on 8) The device of claim 8, wherein, to determine that the message indicates that the entire picture belongs to the refreshed region of the picture, the video coder is configured to determine that a refreshed_region_flag syntax element associated with the region refresh SEI message has a value of 1. ### Claim 10 (depends on 9) The device of claim 9, wherein the refreshed_region_flag syntax element is associated with a first slice segment of an access unit (AU) that includes the picture, and wherein, to determine that the entire picture belongs to the refreshed region, the video coder is configured to determine that each slice segment of the AU different from the first slice segment of the AU is associated with a corresponding refreshed_region_flag syntax element. ### Claim 11 A computer-readable storage medium having stored thereon instructions that, when executed, cause a processor of a computing device to: receive from an encoded video bitstream a message associated with a picture, the message comprising information indicating a refreshed region of the picture; determine whether the picture comprises a last picture in a gradual decoder refresh (GDR) set; determine whether the picture comprises a recovery point picture; responsive to the determination that the picture comprises the last picture in the GDR set and the recovery point picture, determine that the message indicates that the entire picture belongs to the refreshed region of the picture; and decode the picture based on the determination that the message indicates that the entire picture belongs the refreshed region of the picture. ### Claim 12 (depends on 11) The computer-readable storage medium of claim 11, wherein the message comprises a supplemental enhancement information (SEI) message. ### Claim 13 (depends on 12) The computer-readable storage medium of claim 12, wherein the SEI message comprises a region refresh SEI message. ### Claim 14 (depends on 13) The computer-readable storage medium of claim 13, wherein the instructions that cause the processor of the computing device to determine that the message indicates that the entire picture belongs to the refreshed region of the picture comprise instructions that, when executed, cause the processor of the computing device to determine that a refreshed_region_flag syntax element associated with the region refresh SEI message has a value of 1. ### Claim 15 (depends on 14) The computer-readable storage medium of claim 14, wherein the refreshed_region_flag syntax element is associated with a first slice segment of an access unit (AU) that includes the picture, and wherein the instructions that cause the processor of the computing device to determine that the entire picture belongs to the refreshed region comprise instructions that, when executed, cause the processor of the computing device to determine that each slice segment of the AU different from the first slice segment of the AU is associated with a corresponding refreshed_region_flag syntax element. ### Claim 16 A device for decoding video data, the device comprising: means for receiving from an encoded video bitstream a message associated with a picture, the message comprising information indicating a refreshed region of the picture; means for determining whether the picture comprises a last picture in a gradual decoder refresh (GDR) set; means for determining whether the picture comprises a recovery point picture; means for, responsive to determining that the picture comprises the last picture in the GDR set and the recovery point picture, determining that the message indicates that the entire picture belongs to the refreshed region of the picture; and means for decoding the picture based on the determination that the message indicates that the entire picture belongs the refreshed region of the picture. ### Claim 17 (depends on 16) The device of claim 16, wherein the message comprises a supplemental enhancement information (SEI) message. ### Claim 18 (depends on 17) The device of claim 17, wherein the SEI message comprises a region refresh SEI message. ### Claim 19 (depends on 18) The device of claim 18, wherein the means for determining that the message indicates that the entire picture belongs to the refreshed region of the picture comprise means for determining that a refreshed_region_flag syntax element associated with the region refresh SEI message has a value of 1. ### Claim 20 (depends on 19) The device of claim 19, wherein the refreshed_region_flag syntax element is associated with a first slice segment of an access unit (AU) that includes the picture, and wherein the means for determining that the entire picture belongs to the refreshed region further comprise means for determining that each slice segment of the AU different from the first slice segment of the AU is associated with a corresponding refreshed_region_flag syntax element.