# US 8,787,688 B2 · Tracking a reference picture based on a designated picture on an electronic device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,787,688 B2 - Document ID: US8787688B2 - Status: Granted - Kind: B2 - Application number: 13/291,961 - Filed: 2011-11-08 - Published: 2013-04-18 - Granted: 2014-07-22 - Earliest claimed: 2011-10-13 - Assignees: Sharp Laboratories of America, Inc. - Applicants: Kiran Misra; Sachin G. Deshpande; Christopher A. Segall - Inventors: Kiran Misra; Sachin G. Deshpande; Christopher A. Segall - Web page: https://patentgrep.com/patent/US8787688B2 ## CPC - H04N 19/46: Embedding additional information in the video signal during the compression process (H04N19/517, H04N19/68, H04N19/70 take precedence) - H04N 19/58: Motion compensation with long-term prediction, i.e. the reference frame for a current frame not being the temporally closest one (H04N19/23 takes precedence) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A method for tracking a reference picture on an electronic device is described. The method includes receiving a bitstream. The method also includes decoding a portion of the bitstream to produce a decoded reference picture. The method further includes tracking the decoded reference picture in a decoded picture buffer (DPB) with reduced overhead referencing based on a designated picture. The method additionally includes decoding a picture based on the decoded reference picture. ## Claims ### Claim 1 A method for tracking a reference picture on an electronic device, comprising: receiving a bitstream; decoding a portion of the bitstream to produce a decoded reference picture; tracking the decoded reference picture in a decoded picture buffer (DPB) with reduced overhead referencing based on a designated picture, wherein the tracking is based on a signaled wrap indicator, wherein the wrap indicator indicates a transition between two sets of pictures; and decoding a picture based on the decoded reference picture. ### Claim 2 (depends on 1) The method of claim 1, wherein the designated picture is an instantaneous decoding refresh (IDR) picture. ### Claim 3 (depends on 1) The method of claim 1, wherein tracking the decoded reference picture comprises determining a cycle parameter based on the designated picture. ### Claim 4 (depends on 3) The method of claim 3, wherein the cycle parameter is reset based on the designated picture. ### Claim 5 (depends on 1) The method of claim 1, wherein tracking the decoded reference picture comprises determining a picture order count (POC) based on the designated picture. ### Claim 6 (depends on 5) The method of claim 5, wherein a picture order count (POC) sequence is reset based on the designated picture. ### Claim 7 (depends on 1) The method of claim 1, wherein a buffer description of the decoded reference picture comprises a picture order count (POC), a cycle parameter, a temporal identifier and a scaling parameter. ### Claim 8 (depends on 1) The method of claim 1, wherein a resolution of the decoded reference picture is different from a resolution of the picture. ### Claim 9 (depends on 8) The method of claim 8, wherein the method further comprises processing transform coefficients of the decoded reference picture based on a scaling parameter to decode the picture. ### Claim 10 (depends on 1) The method of claim 1, wherein tracking the decoded reference picture comprises tracking a decoded reference picture collection that includes the decoded reference picture. ### Claim 11 (depends on 1) The method of claim 1, wherein tracking the decoded reference picture comprises: obtaining a buffer description; and modifying the buffer description. ### Claim 12 (depends on 11) The method of claim 11, wherein modifying the buffer description comprises at least one of deleting an entry, adding an entry and replacing an entry. ### Claim 13 An electronic device configured for tracking a reference picture, comprising: a processor; memory in electronic communication with the processor; instructions stored in the memory, the instructions being executable to: receive a bitstream; decode a portion of the bitstream to produce a decoded reference picture; track the decoded reference picture in a decoded picture buffer (DPB) with reduced overhead referencing based on a designated picture, wherein the tracking is based on a signaled wrap indicator, wherein the wrap indicator indicates a transition between two sets of pictures; and decode a picture based on the decoded reference picture. ### Claim 14 (depends on 13) The electronic device of claim 13, wherein the designated picture is an instantaneous decoding refresh (IDR) picture. ### Claim 15 (depends on 13) The electronic device of claim 13, wherein tracking the decoded reference picture comprises determining a cycle parameter based on the designated picture. ### Claim 16 (depends on 15) The electronic device of claim 15, wherein the cycle parameter is reset based on the designated picture. ### Claim 17 (depends on 13) The electronic device of claim 13, wherein tracking the decoded reference picture comprises determining a picture order count (POC) based on the designated picture. ### Claim 18 (depends on 17) The electronic device of claim 17, wherein a picture order count (POC) sequence is reset based on the designated picture. ### Claim 19 (depends on 13) The electronic device of claim 13, wherein a buffer description of the decoded reference picture comprises a picture order count (POC), a cycle parameter, a temporal identifier and a scaling parameter. ### Claim 20 (depends on 13) The electronic device of claim 13, wherein a resolution of the decoded reference picture is different from a resolution of the picture. ### Claim 21 (depends on 20) The electronic device of claim 20, wherein the instructions being further executable to process transform coefficients of the decoded reference picture based on a scaling parameter to decode the picture. ### Claim 22 (depends on 13) The electronic device of claim 13, wherein tracking the decoded reference picture comprises tracking a decoded reference picture collection that includes the decoded reference picture. ### Claim 23 (depends on 13) The electronic device of claim 13, wherein tracking the decoded reference picture comprises: obtaining a buffer description; and modifying the buffer description. ### Claim 24 (depends on 23) The electronic device of claim 23, wherein modifying the buffer description comprises at least one of deleting an entry, adding an entry and replacing an entry.