US 12,267,516 B2
Methods of reference picture indication for video coding and related apparatuses
Rickard Sjöberg, Stockholm (SE); Mitra Damghanian, Upplands-Bro (SE); and Martin Pettersson, Vallentuna (SE)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Filed on Jul. 28, 2023, as Appl. No. 18/227,430.
Application 18/227,430 is a continuation of application No. 17/279,183, granted, now 11,770,547, previously published as PCT/EP2019/076215, filed on Sep. 27, 2019.
Claims priority of provisional application 62/739,939, filed on Oct. 2, 2018.
Prior Publication US 2023/0370627 A1, Nov. 16, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/44 (2014.01); H04N 19/105 (2014.01); H04N 19/169 (2014.01); H04N 19/172 (2014.01); H04N 19/46 (2014.01)
CPC H04N 19/44 (2014.11) [H04N 19/105 (2014.11); H04N 19/172 (2014.11); H04N 19/1887 (2014.11); H04N 19/46 (2014.11)] 23 Claims
OG exemplary drawing
 
1. A method for decoding a current picture from a bitstream, the method comprising
decoding one or more code words specifying a number N of pictures, including both short-term and long-term pictures;
decoding one or more code words in a loop that is run N times by:
decoding an indication of whether a picture is a long-term picture or not;
deriving an integer K[i] for each long-term picture i, wherein the integer K[i] is derived by two code words A[i] and B[i], wherein B[i] is signaled using a fixed length code word of size n, and A[i] is signaled using a variable length code;
deriving an indicator value V[i] for at least one long-term picture based on the value of the integer K[i] and a picture indicator value P of the current picture; and
for each of the indicator values V[i], comparing the indicator value V[i] with values associated with pictures stored in the DPB,
keeping the pictures stored in the DPB that are marked as short-term or long-term for which there is a match with one of the indicator values V[i] in the DPB as long-term pictures, and
marking long-term pictures for which there is no match with any indicator value V[i] as unused for reference in the DPB.