Patent ID: 7856056
Filing Date: 2010-12-21
Classification: H04N

Abstract:
1. A video encoding method performed by an encoder for subjecting an input video image having a luminance component and first and second color difference components to motion compensation prediction encoding, comprising: determining a combination comprising (A) a reference image, and (B) a combination selected from a plurality of combinations, each 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 for a to-be-encoded block; determining an index indicating the combination, two values of the index which correspond to different reference images indicating an identical combination of the weighting factors and the offsets, respectively; generating a motion compensation prediction image for the to-be-encoded 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 a motion vector; generating a prediction error signal for the to-be-encoded block by calculating an error between the input video image and the motion compensation prediction image; generating a quantized orthogonal transform coefficient for the to-be-encoded block by subjecting the prediction error signal to orthogonal transform and quantization; and using the encoder, encoding (1) the quantized orthogonal transform coefficient, (2) information of the motion vector and (3) the index.