Patent ID: 7848421
Filing Date: 2010-12-07
Classification: H04N

Abstract:
1. A video decoding apparatus of 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 apparatus comprising: a receiver configured to receive encoded data obtained by encoding, for a to-be-decoded block, (1) a given number of indexes each indicating a reference image and a combination of (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 (2) a quantized orthogonal transform coefficient of a prediction error signal concerning the luminance component and the first and second color difference components; a deriving module configured to derive, for the to-be-decoded block, the given number of reference images, the weighting factors and the offsets from the given number of indexes; a first generator configured to generate the prediction error signal for the to-be-decoded block by subjecting the quantized orthogonal transform coefficient to inverse quantization and inverse orthogonal transform; a second generator configured to generate a prediction image for the to-be-decoded block by multiplying the luminance component and the first and second color difference components of the given number of the reference images respectively by the weighting factors corresponding to the respective reference images and adding the offsets, respectively, to results of the multiplying; and a third generator configured to generate a decoded image signal for the to-be-decoded block by calculating a sum of the prediction error signal and the prediction image.