Patent ID: 7675975
Filing Date: 2010-03-09
Classification: H04N

Abstract:
1. A video decoding apparatus of decoding encoded data obtained by subjecting the video image having a luminance and two color differences to motion compensation prediction encoding, comprising: means for receiving, as an input, encoded data obtained by encoding for a to-be-decoded block (1) a quantized orthogonal transform coefficient of a prediction error signal concerning a luminance and two color differences, (2) information of a motion vector, and (3) index information indicating a combination comprising (A) a reference image, (B) a weighting factor every luminance and two color differences and (C) an offset every luminance and two color differences; means for determining either a frame block or a field block for the to-be-decoded block; means for deriving the reference image, the weighting factor and the offset from the index information for the to-be-decoded block based on whether the to-be-decoded block is the frame block or the field block; means for generating a motion compensation prediction image for the to-be-decoded block by multiplying the reference image by the weighting factor and adding the offset, based on a motion vector for the to-be-decoded block; means for 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; and means for generating a decoded image signal for the to-be-decoded block by calculating a sum of the prediction error signal and the motion compensation prediction image, wherein each value of the index information for the flame block indicate a different combination of the weighting factor and the offset, and wherein two values of the index information for the field block, the index information corresponding to different reference images, indicate an identical combination of the weighting factor and the offset respectively.