Patent ID: 7864845

Claim:
A video encoding apparatus of subjecting an input video image to motion compensation prediction encoding, the input video image having a luminance component and first and second color difference components, the video encoding apparatus comprising: a first determining module configured to determine, for a to-be-encoded block of the input video, 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; a second determining module configured to determine an index indicating the determined combination; a first generator configured to generate 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; a second generator configured to generate 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; a third generator configured to generate a quantized orthogonal transform coefficient for the to-be-encoded block by subjecting the prediction error signal to orthogonal transform and quantization; and an encoder configured to encode (1) the quantized orthogonal transform coefficient, (2) information of the motion vector and (3) the index.