Patent ID: 7848417
Filing Date: 2010-12-07
Classification: H04N

Abstract:
1. A video encoding apparatus of subjecting an input video image to motion compensation predictive encoding, the input video image having a luminance component and first and second color difference components, the apparatus comprising: a determining module configured to determine an index indicating one combination of a plurality of combinations 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 factor and the offset for the luminance component; a first generator configured to generate a motion compensation prediction image for a 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 motion compensation 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, (2) information of the motion vector and (3) the index, and encode, for one or more to-be-encoded blocks, the plurality of combinations.