US 11,943,439 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 Jul. 18, 2022, as Appl. No. 17/867,284.
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, 2021.
Prior Publication US 2022/0377333 A1, Nov. 24, 2022
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, f(a, b, x), is applied to an input of the inverse colour transform,
wherein f(a, b, x)=(x<a?a:(x>b?b:x)), x is a value to be clipped, a is an integer lower bound of the clipping operation, and b is an integer upper bound of the clipping operation,
wherein a=−(1<<(BitDepth+K)) and BitDepth is a bit depth of the current video block,
wherein b=(1<<(BitDepth+K))−1, and
wherein K is a non-zero integer.