Patent ID: 7869507
Filing Date: 2011-01-11
Classification: H04N

Abstract:
1. A video encoding method for subjecting an input video image to prediction encoding, the video image having a luminance component and, first and second color difference components, the method comprising: determining, for a to-be-encoded block, an index indicating (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, (f) a third offset for the second color difference component, and (g) a flag indicating presence or non-presence of the weighting factors and the offsets concerning the color difference components; generating a prediction image 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; generating a prediction error signal by calculating an error between the input video image and the prediction image; generating a quantized orthogonal transform coefficient by subjecting the prediction error signal to orthogonal transform and quantization; and encoding, for the to-be-encoded block, (1) the quantized orthogonal transform coefficient and (2) the index and encoding the plurality of combinations for one or more of the to-be-encoded blocks, wherein two values of the index which correspond to the different reference images respectively indicate an identical combination of the weighting factor and the offset.