Patent ID: 7869506
Filing Date: 2011-01-11
Classification: H04N

Abstract:
1. A prediction image generating method for generating a prediction image from encoded data obtained by subjecting a video image having a luminance component and first and second color difference components, the method comprising: receiving an input of encoded data obtained by encoding, for one or more to-be-decoded blocks, a plurality of combinations comprising (1) a first weighting factor for the luminance component, a second weighting factor for the first color difference component, and a third weighting factor for the second color difference component, and (2) a first offset for the luminance component, a second offset for the first color difference component, and a third offset for the second color difference component, and encoding, for a to-be-decoded block, (A) a given number of indexes respectively indicating (a) one combination selected from the plurality of combinations and (b) a reference image and (B) information of motion vectors; deriving, for the to-be-decoded block, the given number of weighting factors and the given number of offsets from the plurality of combinations and the given number of indexes; and generating a prediction image by multiplying the luminance and the first and second color difference components of the given number of reference images by the weighting factors respectively corresponding to reference images and adding the given number of offsets respectively, to results of the multiplying, based on the motion vectors.