US 11,930,211 B2
Method and system for intra mode coding
Liang Zhao, Sunnyvale, CA (US); Xin Zhao, San Diego, CA (US); and Shan Liu, San Jose, CA (US)
Assigned to TENCENT AMERICA LLC, Palo Alto, CA (US)
Filed by Tencent America LLC, Palo Alto, CA (US)
Filed on May 26, 2022, as Appl. No. 17/825,770.
Application 17/825,770 is a continuation of application No. 17/068,522, filed on Oct. 12, 2020, granted, now 11,363,295.
Claims priority of provisional application 62/941,350, filed on Nov. 27, 2019.
Prior Publication US 2022/0295096 A1, Sep. 15, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/593 (2014.01); H04N 9/11 (2006.01); H04N 19/124 (2014.01); H04N 19/13 (2014.01); H04N 19/157 (2014.01); H04N 19/172 (2014.01); H04N 19/176 (2014.01); H04N 19/184 (2014.01)
CPC H04N 19/593 (2014.11) [H04N 19/124 (2014.11); H04N 19/13 (2014.11); H04N 19/157 (2014.11); H04N 19/172 (2014.11); H04N 19/176 (2014.11); H04N 19/184 (2014.11); H04N 9/11 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A video decoding method, comprising:
obtaining a current frame of a video input;
partitioning the current video frame into a plurality of coding blocks;
predicting a symbol level for each coding block in intra prediction modes included in an allowed intra prediction mode (AIPM) set, wherein the AIPM set for luma components in each coding block is called AIPM_Luma, and the AIPM set for chroma components in each coding block is called AIPM_Chroma;
transforming and quantizing a residual symbol level;
entropy coding the transformed and quantized residual symbol level; and
outputting a bitstream,
wherein the intra prediction modes included in the AIPM set are determined by:
determining whether a current video coding format for the current frame is of a video coding scheme based on a Versatile Video Coding (VVC) standard or a video coding scheme based on an AOMedia Video 1 (AV1) standard;
when the current video coding format is of the video coding scheme based on the VVC standard, including 6 most probable modes (MPM) and 32 remaining modes in the AIPM set; and
when the current video coding format is of the video coding scheme based on the AV1 standard, including directional modes of 8 nominal angles and non-directional or smooth modes in the AIPM set, regardless of a size of the current coding block or the intra prediction modes of neighboring coding blocks.