Patent ID: 7876823

Claim:
A prediction image generation apparatus for generating a prediction image from encoded data obtained by subjecting a video image to predictive encoding, the video image having a luminance component and first and second color difference components, the apparatus comprising: a receiver configured to receive, as an input, encoded data obtained by encoding an index information for a to-be-decoded block, the index indicating 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, for the to-be-decoded block, the weighting factors and the offsets from the index; and a generator configured to generate a prediction image for the to-be-decoded 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.