Image coding method, image decoding method, image coding apparatus, and image decoding apparatus

摘要

An image coding method includes: generating a first flag indicating whether or not a motion vector predictor is to be selected from among one or more motion vector predictor candidates; generating a second flag indicating whether or not a motion vector predictor is to be selected from among the one or more motion vector predictor candidates in coding a current block to be coded in a predetermined coding mode, when the first flag indicates that a motion vector predictor is to be selected; and generating a coded signal in which the first flag and the second flag are included in header information, when the first flag indicates that a motion vector predictor is to be selected.

主权项

1. An apparatus for decoding a coded signal generated by prediction coding of pictures, the apparatus comprising:
one or more processors; and a storage coupled to the one or more processors; wherein the one or more processors are configured to: decode first information, from header information of the coded signal, the first information indicating whether or not a motion vector predictor can be selected from among one or more motion vector predictor candidates; decode second information when the first information indicates that a motion vector predictor can be selected, the second information indicating whether or not a motion vector predictor is selected, in skip mode, from among the one or more motion vector predictor candidates for decoding a current block to be decoded; decode, from the coded signal, index information indicating a motion vector predictor to be selected from among the one or more motion vector predictor candidates, when both (a) the first information indicates that a motion vector predictor can be selected and (b) the second information indicates that a motion vector predictor is selected, in the skip mode, for the decoding of the current block; and decode the current block using the motion vector predictor selected based on the index information, wherein the coded signal does not include the second information when the first information does not indicate that the motion vector predictor can be selected, and the coded signal does not include the index information when one of (a) the first information does not indicate that the motion vector predictor can be selected and (b) the second information does not indicate that the motion vector predictor is selected.