Patent ID: 9473787
Filing Date: 2016-10-18
CPC Classification: H04N

Claim Text:
1. A video coding apparatus comprising: an acquisition part that acquires an original image of a coding target; a prediction image generator that performs at least inter prediction on the acquired original image at each of predetermined regions, to generate a prediction image at the region by referring to at least one index from a candidate list in which a plurality of indexes of motion vectors to be candidates are described; a difference calculator that generates a residual component with respect to the original image by calculating a difference between the prediction image generated at each of the regions and an image being in the original image and corresponding to the prediction image; and a coder that generates an output image stream by performing coding processing on the residual component, wherein the prediction image generator generates the candidate list, in which the plurality of indexes of motion vectors to be the candidates are described, for being referred to during the inter prediction for each of at least three inter prediction blocks among the plurality of inter prediction blocks defined in a video coding standard and to be applied to the original image, using an index described in the generated candidate list, calculates an evaluation value indicating coding efficiency during the use of the index with respect to each of the blocks used to generate the candidate list, to generate the prediction image based on the calculated evaluation value, and when the motion vector that is listed as a candidate common to the candidate lists of at least the three blocks is included, sets the index used to calculate the evaluation value and listed in the generated candidate list such that the at least one common motion vector is included.