US 12,439,034 B2
Determination method for chroma intra prediction mode and image encoding device
Shaobo Zhang, Shanghai (CN); Jianqiang Du, Shanghai (CN); Chengwei Zheng, Shanghai (CN); Qun Wang, Shanghai (CN); and Zhenbao Huang, Shanghai (CN)
Assigned to SIGMASTAR TECHNOLOGY LTD., Fujian (CN)
Filed by SigmaStar Technology Ltd., Fujian (CN)
Filed on Aug. 1, 2024, as Appl. No. 18/791,861.
Claims priority of application No. 202311061244.6 (CN), filed on Aug. 22, 2023.
Prior Publication US 2025/0071270 A1, Feb. 27, 2025
Int. Cl. H04N 19/11 (2014.01); H04N 19/136 (2014.01); H04N 19/147 (2014.01); H04N 19/176 (2014.01); H04N 19/182 (2014.01); H04N 19/186 (2014.01); H04N 19/593 (2014.01)
CPC H04N 19/11 (2014.11) [H04N 19/136 (2014.11); H04N 19/147 (2014.11); H04N 19/176 (2014.11); H04N 19/182 (2014.11); H04N 19/186 (2014.11); H04N 19/593 (2014.11)] 14 Claims
OG exemplary drawing
 
1. A determination method for a chroma intra prediction encoding mode, the method comprising:
performing a simple rate-distortion optimization (RDO) calculation on a luminance value of each pixel of an image block to obtain a plurality of luminance candidate modes;
determining a plurality of chroma candidate modes according to one of the plurality of luminance candidate modes and a chroma simple RDO result obtained by performing a simple RDO calculation on a chroma value of each pixel of the image block;
performing a full RDO calculation corresponding the plurality of luminance candidate modes on the luminance value of each pixel of the image block to select a luminance target mode;
performing a full RDO calculation corresponding to the plurality of chroma candidate modes on the chroma value of each pixel of the image block to obtain chroma full RDO results; and
determining a chroma target mode according to the luminance target mode and the chroma full RDO results;
wherein, the simple RDO calculation performed on the luminance value of each pixel of the image block and the simple RDO calculation performed on the chroma value of each pixel of the image block are performed in parallel.