# US 2014/0192896 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 2014/0192896 A1 - Document ID: US20140192896A1 - Status: Published application - Kind: A1 - Application number: 14/147,973 - 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/US20140192896A1 ## 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 a plurality of pictures, receiving, in a message associated with a first picture of the plurality of pictures, information indicating a picture order count (POC) value of a recovery point picture of a gradual decoder refresh (GDR) set, when a picture that follows the first picture in decoding order has the POC value that is equal to a POC value of the recovery point picture, identifying the picture having the POC value equal to the POC value of the recovery point picture, as a recovery point picture, and when none of the pictures that follow the first picture has the POC value that is equal to the POC value of the recovery point picture, identifying one of the pictures that has a POC value greater than the POC value of the recovery point picture as the recovery point picture. ## Claims ### Claim 1 A method of decoding video data, the method comprising: receiving a plurality of pictures from an encoded video bitstream; receiving, from the encoded video bitstream a message associated with a first picture of the plurality of pictures, information indicating a picture order count (POC) value of a recovery point picture of a gradual decoder refresh (GDR) set; when a picture that follows the first picture in decoding order has the POC value that is equal to a POC value of the recovery point picture, identifying the picture having the POC value equal to the POC value of the recovery point picture as a recovery point picture; and when none of the pictures that follow the first picture has the POC value that is equal to the POC value of the recovery point picture, identifying one of the pictures that has a POC value greater than the POC value of the recovery point picture as the recovery point picture. ### Claim 2 (depends on 1) The method of claim 1, further comprising: in response to identifying the picture having the POC value equal to the POC value of the recovery point picture as the recovery point picture, identifying the picture having the POC value equal to the POC value of the recovery point picture as a last picture of the GDR set; and in response to identifying the picture that has the POC value greater than the POC value of the recovery point picture as the recovery point picture, identifying one of the pictures that has a POC value less than the POC value of the recovery point picture as the last picture of the GDR set. ### Claim 3 (depends on 1) The method of claim 1, wherein the POC value of the picture that has the POC value less than the POC value of the recovery point picture is greater than a POC value of the first picture. ### Claim 4 (depends on 1) The method of claim 1, wherein the message comprises a supplemental enhancement information (SEI) message. ### Claim 5 (depends on 4) The method of claim 4, wherein the SEI message comprises a recovery point SEI message. ### Claim 6 (depends on 1) The method of claim 1, wherein the information indicating the POC value of the recovery point picture comprises information indicating a difference between a POC value of the first picture and the POC value of the recovery point picture. ### Claim 7 (depends on 1) The method of claim 1, wherein the information indicating the POC value of the recovery point picture comprises the POC value of the recovery point picture. ### Claim 8 (depends on 1) The method of claim 1, further comprising performing random access decoding with respect to the identified recovery point picture and one or more pictures that follow the identified recovery point picture in decoding order. ### Claim 9 A device for decoding video data, the device comprising: a memory configured to store encoded video data; and a video decoder configured to: receive a plurality of pictures of the encoded video data; receive, in a message associated with a first picture of the plurality of pictures, information indicating a POC value of a recovery point picture of a gradual decoder refresh (GDR) set; when a picture that follows the first picture in decoding order has the POC value that is equal to a POC value of the recovery point picture, identify the picture having the POC value equal to the POC value of the recovery point picture as a recovery point picture; and when none of the pictures that follow the first picture has the POC value that is equal to the POC value of the recovery point picture, identify one of the pictures that has a POC value greater than the POC value of the recovery point picture as the recovery point picture. ### Claim 10 (depends on 9) The device of claim 9, wherein the video coder is further configured to: in response to identifying the picture having the POC value equal to the POC value of the recovery point picture as the recovery point picture, identify the picture having the POC value equal to the POC value of the recovery point picture as a last picture of the GDR set; and in response to identifying the picture that has the POC value greater than the POC value of the recovery point picture as the recovery point picture, identify one of the pictures that has a POC value less than the POC value of the recovery point picture as the last picture of the GDR set. ### Claim 11 (depends on 9) The device of claim 9, wherein the POC value of the picture that has the POC value less than the POC value of the recovery point picture is greater than a POC value of the first picture. ### Claim 12 (depends on 9) The device of claim 9, wherein the message comprises a supplemental enhancement information (SEI) message. ### Claim 13 (depends on 12) The device of claim 12, wherein the SEI message comprises a recovery point SEI message. ### Claim 14 (depends on 9) The device of claim 9, wherein the information indicating the POC value of the recovery point picture comprises information indicating a difference between a POC value of the first picture and the POC value of the recovery point picture. ### Claim 15 (depends on 9) The device of claim 9, wherein the information indicating the POC value of the recovery point picture comprises the POC value of the recovery point picture. ### Claim 16 (depends on 15) The device of claim 15, wherein the video coder is further configured to perform random access decoding with respect to the identified recovery point picture and one or more pictures that follow the identified recovery point picture in decoding order. ### Claim 17 A computer-readable storage medium having stored thereon instructions that, when executed, cause a processor of a computing device to: receive a plurality of pictures from an encoded video bitstream; receive, from the encoded video bitstream a message associated with a first picture of the plurality of pictures, information indicating a POC value of a recovery point picture of a gradual decoder refresh (GDR) set; when a picture that follows the first picture in decoding order has the POC value that is equal to a POC value of the recovery point picture, identify the picture having the POC value equal to the POC value of the recovery point picture as a recovery point picture; and when none of the pictures that follow the first picture has the POC value that is equal to the POC value of the recovery point picture, identify one of the pictures that has a POC value greater than the POC value of the recovery point picture as the recovery point picture. ### Claim 18 (depends on 17) The computer-readable storage medium of claim 17, wherein the message comprises a recovery point supplemental enhancement information (SEI) message. ### Claim 19 A device for decoding video data, the device comprising: means for receiving a plurality of pictures from an encoded video bitstream; means for receiving, from the encoded video bitstream a message associated with a first picture of the plurality of pictures, information indicating a POC value of a recovery point picture of a gradual decoder refresh (GDR) set; means for identifying, when a picture that follows the first picture in decoding order has the POC value that is equal to a POC value of the recovery point picture, the picture having the POC value equal to the POC value of the recovery point picture as a recovery point picture; and means for identifying, when none of the pictures that follow the first picture has the POC value that is equal to the POC value of the recovery point picture, one of the pictures that has a POC value greater than the POC value of the recovery point picture as the recovery point picture. ### Claim 20 (depends on 19) The device of claim 19, wherein the message comprises a recovery point supplemental enhancement information (SEI) message.