US 12,382,038 B2
Method and apparatus of luma-chroma separated coding tree coding with constraints
Chia-Ming Tsai, Hsinchu (TW); Tzu-Der Chuang, Hsinchu (TW); Chih-Wei Hsu, Hsinchu (TW); Ching-Yeh Chen, Hsinchu (TW); and Zhi-Yi Lin, Hsinchu (TW)
Assigned to HFI INNOVATION INC., Zhubei (TW)
Filed by HFI Innovation Inc., Zhubei (TW)
Filed on Feb. 5, 2024, as Appl. No. 18/432,417.
Application 18/432,417 is a continuation of application No. 17/418,311, granted, now 11,930,174, previously published as PCT/CN2019/130044, filed on Dec. 30, 2019.
Claims priority of provisional application 62/865,397, filed on Jun. 24, 2019.
Claims priority of provisional application 62/786,530, filed on Dec. 30, 2018.
Prior Publication US 2024/0179311 A1, May 30, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/119 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01); H04N 19/96 (2014.01)
CPC H04N 19/119 (2014.11) [H04N 19/176 (2014.11); H04N 19/186 (2014.11); H04N 19/96 (2014.11)] 5 Claims
OG exemplary drawing
 
1. A method of video coding used by a video coding system, the method comprising:
receiving input data associated with a current block in a current picture, wherein the input data comprise pixel data to be encoded at an encoder side or compressed data at a decoder side, and wherein the current block comprises a luma block and a chroma block;
if separate partition trees are allowed for the luma block and the chroma block, partitioning the luma block into one or more luma leaf blocks using a luma partition tree and partitioning the chroma block into one or more chroma leaf blocks using a chroma partition tree;
if a cross-colour component prediction mode is allowed, determining whether to enable an LM (Linear Model) mode for a target chroma leaf block based on a first split type applied to an ancestor chroma node of the target chroma leaf block and a second split type applied to a corresponding ancestor luma node, wherein:
when the second split type corresponds to no split and the first split type corresponds to QT (quadtree) split, HorBT (horizontal binary tree) split with no further split, or HorBT split followed by VerBT (vertical binary tree) split, the LM mode for the target chroma leaf block is enabled; or
when the second split type corresponds to QT (quadtree) split and the first split type corresponds to no split, or HorBT (horizontal binary tree) split with no further split, the LM mode for the target chroma leaf block is enabled; and
encoding or decoding the target chroma leaf block using the LM mode if the LM mode is enabled for the target chroma leaf block.