Patent ID: 11924411
Assignee: BEIJING DAJIA INTERNET INFORMATION TECHNOLOGY CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A non-transitory computer readable storage medium storing bitstream that is generated by acts comprising:
deriving a first parameter α and a second parameter β for a cross-component linear model (CCLM) mode by using four neighboring down-sampled luma samples and four corresponding chroma samples of a coding unit (CU), wherein each down-sampled luma sample and its corresponding chroma sample have the same row index and the same column index;
wherein depending on a respective prediction mode, the four neighboring down-sampled luma samples and four corresponding chroma samples include one of following sets:
a top sample among left neighboring samples, a leftmost sample among above neighboring samples, a bottom sample among the left neighboring samples, and a rightmost sample among the above neighboring samples;
sample at a quarter of width from the leftmost sample among the above neighboring samples, sample at a quarter of height from the top sample among the left neighboring samples, the bottom sample among the left neighboring samples, and the rightmost sample among the above neighboring samples;
sample at the quarter of width from the leftmost sample among the above neighboring samples, sample at the quarter of height from the top sample among the left neighboring samples, sample at the three quarter of width from the leftmost sample among the above neighboring samples, sample at the three quarter of height from the top sample among the left neighboring samples;
sample at a one-eighth of width from the leftmost sample among the above neighboring samples, sample at the three-eighth of width from the leftmost sample among the above neighboring samples, sample at the five-eighth of width from the leftmost sample among the above neighboring samples, sample at the seven-eighth of width from the leftmost sample among the above neighboring samples; and
sample at a one-eighth of height from the top sample among the left neighboring samples, sample at the three-eighth of height from the top sample among the left neighboring samples, sample at the five-eighth of height from the top sample among the left neighboring samples, sample at the seven-eighth of height from the top sample among the left neighboring samples;

generating a predicted chroma sample of the CU by using the first parameter α and the second parameter β, and
encoding prediction information associated with the respective prediction mode into a bitstream.