Patent ID: 11930209
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. An apparatus for intra prediction, wherein the apparatus is an encoder or a decoder, and the apparatus comprises one or more processors; and
a non-transitory computer-readable storage medium coupled to the one or more processors and storing programming for execution by the one or more processors, wherein the programming, when executed by the one or more processors, configures the apparatus to:
obtain reconstructed lama samples;
determine maximum and minimum luma sample values based on the reconstructed llama samples;
obtain a difference of the maximum and minimum luma sample values;
fetch a value out of a lookup table (LUT) by using an index, the index corresponding to a log 2( ) of the difference of the maximum and minimum luma sample values; and
obtain linear model parameters α and β based on the fetched value; and calculate a predicted chroma sample value by using the obtained linear model parameters α and β.