US 11,743,509 B2
Intra video coding using a decoupled tree structure
Li Zhang, San Diego, CA (US); Wei-Jung Chien, San Diego, CA (US); Jianle Chen, San Diego, CA (US); Xin Zhao, Santa Clara, CA (US); and Marta Karczewicz, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Feb. 14, 2022, as Appl. No. 17/650,935.
Application 17/650,935 is a continuation of application No. 16/452,315, filed on Jun. 25, 2019, granted, now 11,310,536.
Application 16/452,315 is a continuation of application No. 15/676,345, filed on Aug. 14, 2017, granted, now 10,368,107, issued on Jul. 30, 2019.
Claims priority of provisional application 62/404,572, filed on Oct. 5, 2016.
Claims priority of provisional application 62/375,383, filed on Aug. 15, 2016.
Prior Publication US 2022/0256203 A1, Aug. 11, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/96 (2014.01); H04N 19/70 (2014.01); H04N 19/593 (2014.01); H04N 19/11 (2014.01); H04N 19/463 (2014.01); H04N 19/186 (2014.01); H04N 19/46 (2014.01); H04N 19/124 (2014.01); H04N 19/91 (2014.01)
CPC H04N 19/96 (2014.11) [H04N 19/11 (2014.11); H04N 19/186 (2014.11); H04N 19/46 (2014.11); H04N 19/463 (2014.11); H04N 19/593 (2014.11); H04N 19/70 (2014.11); H04N 19/124 (2014.11); H04N 19/91 (2014.11)] 17 Claims
OG exemplary drawing
 
1. A method of decoding video data, the method comprising:
determining an intra prediction mode for a chroma prediction unit of a chroma block of video data according to an intra prediction mode of a luma prediction unit in a corresponding luma block, the chroma block having a width and a height and the chroma block further having a position defined based on a horizontal offset and a vertical offset relative to a slice of the video data, the slice comprising one of a frame or a portion of a frame,
wherein partitioning of the corresponding luma block into a plurality of luma prediction units is determined using a first tree structure that is separate from a second tree structure that determines the partitioning of the chroma block into chroma predictions units, the first and second tree structures being quad-tree-binary-tree structures, wherein determining the intra prediction mode for the chroma prediction unit of the chroma block according to the intra prediction mode of the luma prediction unit in the corresponding luma block comprises:
determining one of the plurality of luma prediction units of the corresponding luma block that is located at a position corresponding to a center position of the luma block corresponding to the chroma block, wherein the center position is defined according to a coordinate tuple including an x coordinate defined using twice the horizontal offset of the chroma block and a y coordinate defined using twice the vertical offset of the chroma block, wherein the coordinate tuple is based on the width and the height of the chroma block; and
deriving a derived mode (DM) for the chroma mode from a luma mode associated with the luma prediction unit located at the center position of the corresponding luma block partition, and
decoding the chroma prediction unit according to the determined intra prediction mode.