US 11,863,738 B2
Reference picture management and list construction
Alexandros Tourapis, Milpitas, CA (US); Jungsun Kim, Cupertino, CA (US); Krishnakanth Rapaka, San Jose, CA (US); and David W. Singer, San Francisco, CA (US)
Assigned to APPLE INC., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Dec. 2, 2021, as Appl. No. 17/540,356.
Application 17/540,356 is a continuation of application No. 16/669,385, filed on Oct. 30, 2019, granted, now 11,196,988.
Claims priority of provisional application 62/786,771, filed on Dec. 31, 2018.
Claims priority of provisional application 62/780,848, filed on Dec. 17, 2018.
Prior Publication US 2022/0166969 A1, May 26, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/105 (2014.01); H04N 19/172 (2014.01); H04N 19/174 (2014.01); H04N 19/184 (2014.01); H04N 19/513 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/105 (2014.11) [H04N 19/172 (2014.11); H04N 19/174 (2014.11); H04N 19/184 (2014.11); H04N 19/513 (2014.11); H04N 19/70 (2014.11)] 18 Claims
OG exemplary drawing
 
1. A method for managing a decoded picture buffer (DPB) comprising:
responsive to a bitstream of a coded sequence of pictures, deriving a list of all reference pictures used in decoding of a portion of bitstream syntax essentially consisting of a single list of reference pictures including single number indicating a total number of all reference pictures;
decoding a picture in the coded sequence of pictures including predicting a portion of the picture from reference pictures in the list; and
parsing, from the bitstream syntax for entries in the list of reference pictures, an identification of a reference picture by a difference in a picture order count (POC) between a current picture and the identified reference picture, including:
parsing a magnitude of the difference;
determining if the magnitude of the difference is greater than zero;
when the magnitude is determined to be greater than zero, parsing a flag indicating a sign of the difference.