US 12,284,371 B2
Use of offsets with adaptive colour transform coding tool
Weijia Zhu, San Diego, CA (US); Jizheng Xu, San Diego, CA (US); Li Zhang, Los Angeles, CA (US); Kai Zhang, Los Angeles, CA (US); and Yue Wang, Beijing (CN)
Assigned to BEIJING BYTEDANCE TECHNOLOGY CO., LTD., Beijing (CN); and BYTEDANCE INC., Los Angeles, CA (US)
Filed by Beijing Bytedance Network Technology Co., Ltd., Beijing (CN); and Bytedance Inc., Los Angeles, CA (US)
Filed on Jul. 5, 2022, as Appl. No. 17/857,924.
Application 17/857,924 is a continuation of application No. PCT/CN2021/070282, filed on Jan. 5, 2021.
Claims priority of application No. PCT/CN2020/070368 (WO), filed on Jan. 5, 2020.
Prior Publication US 2022/0345730 A1, Oct. 27, 2022
Int. Cl. H04N 19/196 (2014.01); H04N 11/04 (2006.01); H04N 19/105 (2014.01); H04N 19/12 (2014.01); H04N 19/126 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01)
CPC H04N 19/196 (2014.11) [H04N 11/044 (2013.01); H04N 19/105 (2014.11); H04N 19/12 (2014.11); H04N 19/126 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11)] 20 Claims
OG exemplary drawing
 
1. A method of processing video data, comprising:
performing a conversion between a current video block of a video and a bitstream of the video according to a rule that specifies additional quantization parameter offsets are further applied on intermedia quantization parameters, wherein the additional quantization parameter offsets are determined based on whether to apply a color transform mode for the current video block,
wherein in the color transform mode, for an encoding operation, visual signals are converted from a first color domain to a second color domain, or for a decoding operation, the visual signals are converted from the second color domain to the first color domain,
wherein the intermedia quantization parameters are derived from one or more chroma offsets specified in a picture parameter set (PPS) and a slice header (SH), and
wherein the rule further specifies whether a first flag is included in the bitstream, wherein the first flag comprises first general constraints information for one or more pictures in a set of output layers of the video, wherein the first flag indicates whether a second flag in a sequence parameter set (SPS) is equal to 0, and the second flag equal to 0 specifies that a color transform mode for the current video block is disabled.