Patent ID: 7933330
Filing Date: 2011-04-26
Classification: H04N

Abstract:
1. A picture coding apparatus which codes a picture on a block-by-block basis, the picture coding apparatus comprising: a motion compensation unit configured to generate, when performing frame coding on a block included in the picture, a predictive image using i) pixel values of a reference frame to which the block refers and ii) a frame weighting factor, and to generate, when performing field coding on the block, a predictive image using i) pixel values of a reference field to which the block refers and ii) a field weighting factor; and a variable length coding unit configured to code the frame weighting factor and output a coded signal which includes i) a coded picture generated using the predictive image and ii) the coded frame weighting factor, when the picture has a frame structure and switching between the frame coding and the field coding is adaptively performed per block included in the picture, wherein the field weighting factor is generated from the frame weighting factor when the picture has the frame structure and the switching between the frame coding and the field coding is adaptively performed per block included in the picture, and the field weighting factor and the frame weighting factor are coefficients used for calculating pixel values of the predictive image from pixel values of a reference picture.