Patent ID: 7864846
Filing Date: 2011-01-04
Classification: H04N

Abstract:
1. A video encoding method for subjecting an input video image to predictive encoding, the video image having a luminance component and first and second color difference components, comprising: determining whether an encoding unit of a to-be-encoded block is a frame or a field; deriving, for the to-be-encoded block, an index indicating (A) 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, and (f) a third offset for the second color difference component, and (B) a reference image; generating a prediction image by multiplying the luminance and 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 (1) the quantized orthogonal transform coefficient and (2) the index for the to-be-encoded block, wherein respective values of the index indicate different combinations when the encoding unit is the frame, and two values of the index corresponding to different reference images indicate identical combinations when the encoding unit is the field.