Patent ID: 7856057

Claim:
A video decoding apparatus for decoding encoded data obtained by subjecting a video to motion compensation encoding, the video having a luminance component and first and second color difference components, the video decoding apparatus comprising: a receiver configured to receive, as an input, encoded data obtained by encoding for a to-be-decoded block (1) a quantized orthogonal transform coefficient of a prediction error signal concerning the luminance component and the first and second color difference components, (2) information of a motion vector and (3) an index indicating a reference image and 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 deriving module configured to derive the reference image, the weighting factors and the offsets from the index for the to-be-decoded block; a first generator configured to generate the prediction error signal for the to-be-decoded block by subjecting the quantized orthogonal transform coefficients to inverse quantization and inverse orthogonal transform; a second generator configured to generate a motion compensation prediction image for the to-be-decoded block by multiplying the luminance component and the first and second color difference components of the reference image by the weighting factors, respectively, and adding the offsets, respectively, to results of the multiplying, based on the motion vector for the to-be-decoded block; and a third generator configured to generate a decoded image signal for the to-be-decoded block by calculating a sum of the prediction error signal and the motion compensation prediction image.