Patent ID: 9020036
Filing Date: 2015-04-28
Classification: H04N

Abstract:
1. A motion vector coding method for deriving a predicted motion vector for a current block to be coded and coding a motion vector of the current block using the predicted motion vector, the motion vector coding method comprising: determining a motion vector of the current block which is used when performing a motion compensation on the current block; specifying a plurality of neighboring blocks which are located around the current block; deriving a predicted motion vector for the determined motion vector of the current block based on motion vectors of the plurality of neighboring blocks; and coding a difference between the determined motion vector of the current block and the predicted motion vector, wherein the deriving of the predicted motion vector includes: selecting a motion vector which refers to the same reference picture as referred to by the motion vector of the current block, from among motion vectors of the plurality of neighboring blocks having the same identifier as the identifier assigned to the motion vector of the current block when at least one block among the plurality of neighboring blocks has two motion vectors which refer to reference pictures in the same direction in a display order, and when the selected motion vector of the plurality of neighboring blocks is plural, deriving, as the predicted motion vector of the current block, a median value of the selected motion vectors of the plurality of neighboring blocks.