US 12,284,347 B2
Adaptive colour transform in image/video coding
Weijia Zhu, San Diego, CA (US); Jizheng Xu, San Diego, CA (US); Li Zhang, San Diego, CA (US); Kai Zhang, San Diego, CA (US); Ye-kui Wang, San Diego, CA (US); and Yue Wang, Beijing (CN)
Assigned to BEIJING BYTEDANCE NETWORK 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 May 24, 2023, as Appl. No. 18/323,149.
Application 18/323,149 is a continuation of application No. 17/867,284, filed on Jul. 18, 2022, granted, now 11,943,439.
Application 17/867,284 is a continuation of application No. PCT/CN2021/072396, filed on Jan. 18, 2021.
Claims priority of application No. PCT/CN2020/072900 (WO), filed on Jan. 18, 2020.
Prior Publication US 2023/0362375 A1, Nov. 9, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/00 (2014.01); H04N 19/12 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01); H04N 19/196 (2014.01); H04N 19/60 (2014.01); H04N 19/85 (2014.01)
CPC H04N 19/12 (2014.11) [H04N 19/176 (2014.11); H04N 19/186 (2014.11); H04N 19/197 (2014.11); H04N 19/60 (2014.11); H04N 19/85 (2014.11)] 10 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,
wherein when the current video block is coded using a colour transform mode, the conversion comprises applying an inverse colour transform on the current video block according to a rule,
wherein the rule specifies that a clipping operation is applied to an input of the inverse colour transform,
wherein the clipping operation is based on a sum of a bit depth of the current video block and K, wherein K=1,
wherein the clipping operation is denoted f(a, b, x), wherein x is a value to be clipped, a is a lower bound of the clipping operation, and b is an upper bound of the clipping operation, and wherein a and b are integers, and
wherein f(a, b, x)=(x<a ? a:(x>b ? b:x)), and wherein a=−(1<<(BitDepth+K)).