US 12,348,779 B2
Using subpictures and tiles in video coding
Ye-kui Wang, San Diego, CA (US); Li Zhang, San Diego, CA (US); Jizheng Xu, San Diego, CA (US); and Kai Zhang, San Diego, CA (US)
Assigned to BYTEDANCE INC., Los Angeles, CA (US)
Filed by Bytedance Inc., Los Angeles, CA (US)
Filed on Nov. 28, 2022, as Appl. No. 17/994,748.
Application 17/994,748 is a continuation of application No. PCT/US2021/034259, filed on May 26, 2021.
Claims priority of provisional application 63/030,726, filed on May 27, 2020.
Prior Publication US 2023/0128511 A1, Apr. 27, 2023
Int. Cl. H04N 19/70 (2014.01); H04N 19/105 (2014.01); H04N 19/172 (2014.01); H04N 19/186 (2014.01)
CPC H04N 19/70 (2014.11) [H04N 19/105 (2014.11); H04N 19/172 (2014.11); H04N 19/186 (2014.11)] 16 Claims
OG exemplary drawing
 
1. A method of processing video data, comprising:
performing a conversion between a video and a bitstream of the video according to a rule,
wherein the rule specifies that only one of the following two conditions is true when a number of subpictures minus 1 indicated by a first syntax element in a sequence parameter set for a first video picture of the video is greater than zero and when a current subpicture with a subpicture index subpicIdx of the first video picture has a second syntax element in the sequence parameter set indicates that a subpicture with the subpicture index subpicIdx of each video picture of the video in a coded layer video sequence is treated as a video picture in a decoding process that excludes an in-loop filtering operation:
(1) a second video picture referred to by each active entry in a first reference picture list or a second reference picture list of the first video picture and the first video picture have a same value for each of multiple syntax elements related to dimension information, wherein the multiple syntax elements related to dimension information comprise:
the first syntax element indicating the number of subpictures minus 1,
a third syntax element included in a picture parameter set indicating a picture width in units of luma samples,
a fourth syntax element included in the picture parameter set indicating a picture height in units of luma samples,
a fifth syntax element included in the sequence parameter set indicating a horizontal position of a top-left coding tree unit (CTU) of an i-th subpicture,
a sixth syntax element included in the sequence parameter set indicating a vertical position of the top-left CTU of the i-th subpicture,
a seventh syntax element included in the sequence parameter set indicating a width of the i-th subpicture minus 1, and
an eighth syntax element included in the sequence parameter set indicating a height of the i-th subpicture minus 1, the second syntax element for the i-th subpicture, respectively, for each value of i in a range of 0 to the number of subpictures minus 1, inclusive; or
(2) a second video picture referred to by each active entry in a first reference picture list or a second reference picture list is an inter-layer reference picture entry for which a value of the first syntax element indicating the number of subpictures minus 1 is equal to zero.