Patent ID: 7852924
Filing Date: 2010-12-14
Classification: H04N

Abstract:
1. A video encoding apparatus of subjecting an input video image to predictive encoding, the video image having a luminance component and, first and second color difference components, the apparatus comprising: a determining module configured to determine, for a to-be-encoded block, an index indicating 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 for the first and second color difference components; a first generator configured to generate a prediction image for the to-be-encoded block by multiplying the luminance component and the first and second color difference components of a reference image by the weighting factors, respectively, and adding the offsets, respectively, to results of the multiplying; a second generator configured to generate a prediction error signal for the to-be-encoded block by calculating an error between the input video image and the prediction image; a third generator configured to generate a quantized orthogonal transform coefficient for the to-be-encoded block by subjecting the prediction error signal to orthogonal transform and quantization; and an encoder configured to encode, for the to-be-encoded block, (1) the quantized orthogonal transform coefficient and (2) the index and encode, for one or more to-be -encoded blocks, the plurality of combinations.