US 12,225,210 B2
Segment position signalling with subpicture slice position deriving
Mitra Damghanian, Upplands-Bro (SE); Martin Pettersson, Vallentuna (SE); and Rickard Sjöberg, Stockholm (SE)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Appl. No. 17/762,295
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Jun. 26, 2020, PCT No. PCT/SE2020/050668
§ 371(c)(1), (2) Date Mar. 21, 2022,
PCT Pub. No. WO2021/061033, PCT Pub. Date Apr. 1, 2021.
Claims priority of provisional application 62/904,286, filed on Sep. 23, 2019.
Prior Publication US 2022/0385924 A1, Dec. 1, 2022
Int. Cl. H04N 19/174 (2014.01); H04N 19/169 (2014.01); H04N 19/30 (2014.01); H04N 19/44 (2014.01)
CPC H04N 19/174 (2014.11) [H04N 19/1887 (2014.11); H04N 19/30 (2014.11); H04N 19/44 (2014.11)] 20 Claims
OG exemplary drawing
 
1. A method performed by a decoder, the method comprising:
receiving a coded video stream (CVS); and
processing the CVS, wherein:
the CVS comprises a slice header comprising a first codeword that encodes a first value representing a first part of a slice address for a slice that belongs to a subpicture, wherein the first value is a subpicture ID which indicates the subpicture to which the slice belongs,
the slice header comprises a second codeword that encodes a second value representing a second part of the slice address, wherein the second value is a local slice address which indicates the spatial positioning of the slice relative to the subpicture position that the slice belongs to, and
the slice address specifies the spatial location of a slice within a picture, wherein
processing the CVS comprises, prior to decoding the second value from the second codeword, deriving a length of the second codeword using a value N derived from a third codeword in the CVS.