Patent ID: 7864861

Claim:
A video encoding method performed by a video encoder for subjecting an input video image motion compensation prediction encoding, the input video image having a luminance component and first and second color difference components, the video encoding method comprising: determining, for a to-be-encoded block, a combination comprising (A) a first weighting factor for the luminance component, (B) a second weighting factor for the first color difference component, (C) a third weighting factor for the second color difference component, (D) a first offset for the luminance component, (E) a second offset for the first color difference component, and (F) a third offset for the second color difference component; determining an index indicating the determined combination; generating a motion compensation prediction image for the to-be-encoded block by multiplying the luminance component and the first and second color difference components of a reference image by the weighting factors, respectively, and adding the offsets, respectively, to results of the multiplying, based on a motion vector for the to-be-encoded block; generating a prediction error signal for the to-be-encoded block by calculating an error between the input video image and the motion compensation prediction image; generating a quantized orthogonal transform coefficient for the to-be-encoded block by subjecting the prediction error signal to orthogonal transform and quantization; and encoding, by the video encoder, (1) the quantized orthogonal transform coefficient, (2) information of the motion vector and (3) the index.