Patent ID: 7864850
Filing Date: 2011-01-04
Classification: H04N

Abstract:
1. A video decoding method for decoding 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, the video decoding method comprising: receiving encoded data obtained by encoding, for a to-be-decoded block, (1) a quantized orthogonal transform coefficient of a prediction error signal concerning the luminance component and the first and second color difference components and (2) an index indicating a reference image and a 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, CD) 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; deriving, for the to-be-decoded block, the reference image, the weighting factors and the offsets from the index; generating the prediction error signal for the to-be-decoded block by subjecting the quantized orthogonal transform coefficient to inverse quantization and inverse orthogonal transform; generating a prediction image for the to-be-decoded 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; and generating a decoded image signal for the to-be-decoded block by calculating a sum of the prediction error signal and the prediction image.