Patent ID: 7864854
Filing Date: 2011-01-04
Classification: H04N

Abstract:
1. A prediction image generation apparatus of generating a prediction image from encoded data obtained by subjecting a video image to prediction encoding, the video image having a luminance component and first and second color difference components, the prediction image generation apparatus comprising: a receiver configured to receive an input of encoded data obtained by encoding, for one or more to-be-decoded blocks, a plurality 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, and (F) a third offset for the second color difference component, and encoding, for a to-be-decoded block, a given number of indices each indicating (1) a combination of the plurality of combinations and (2) a reference image; a deriving module configured to derive, for the to-be-decoded block, the given number of combinations of the weighting factors and the offsets from the given number of indices and the plurality of combinations; and a generator configured to generate a prediction image by multiplying the luminance and first and second color difference components of the given number of reference images by the respective weighting factors corresponding to the respective reference images and adding the given number of offsets, respectively, to results of the multiplying.