Patent ID: 7864856

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 a given number of combinations each 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, (F) a third offset for the second color difference component, and (G) a reference image; a second determining module configured to determine the given number of indexes which indicate the determined combinations respectively; a first generator configured to generate a motion compensation prediction image for a to-be-encoded block by multiplying the luminance component and the first and second color difference components of the given number of the reference images respectively by the weighting factors corresponding to the respective reference images and adding the offsets, respectively, to results of the multiplying, based on motion vectors for the to-be-encoded block; a second generator configured to generate a prediction error signal for the to-be-encoded block by obtaining an error between the input video image and the motion compensation prediction image; a third generator configured to generating 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 vectors, and (3) the given number of the indexes.