Patent ID: 7848413
Filing Date: 2010-12-07
Classification: H04N

Abstract:
1. A prediction image generation method 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, comprising: receiving an input of encoded data obtained by encoding, for one or more to-be-decoded blocks, a plurality of combinations, each combination comprising (A) (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 and (B) a flag indicating the weighting factors and the offsets concerning the first and second two color difference components, and encoding, for a to-be-decoded block, (1) information of a motion vector and (2) an index indicating one combination of the plurality of combinations; deriving the weighting factors and the offsets from the index and the plurality of combinations for the to-be-decoded block; and generating a prediction image by multiplying the luminance and color difference components of a reference image by the weighting factors, respectively, and adding the offsets, respectively, to results of the multiplying based on the motion vector.