Motion vector coding method and motion vector decoding method

摘要

A motion vector coding unit 117 executes processing including a neighboring block specification step (S 100 ) of specifying a neighboring block which is located in the neighborhood of a current block; a judgment step (Steps S 102, S 104 ) of judging whether or not the neighboring block has been coded using a motion vector of another block; a prediction step (S 106, S 108 ) of deriving a predictive motion vector of the current block using a motion vector calculated from the motion vector of the other block as a motion vector of the neighboring block; and a coding step (S 110 ) of coding the motion vector of the current block using the predictive motion vector.