Moving picture encoding method and decoding method
A moving picture decoding method, which generates a predicted image using information on motion vectors and information on reference images, the moving picture decoding method having multiple prediction modes including a mode without motion vector decoding, including: a step of selecting a frame(s) to be referenced to in the prediction of each prediction direction in the prediction mode from among multiple candidate reference frames, and a step of selecting motion vector information used in the prediction mode, wherein said step of selecting motion vector information is performed based on whether candidate blocks including the block adjacent to the left side of or the upper side of a current block have a motion vector; and moving picture decoding is performed by generating said predicted image using the information on said selected reference frame and the information on said selected motion vectors in said prediction mode.
1. A moving picture decoding method including a prediction mode, comprising:
in said prediction mode, in which prediction mode motion vector information of a current block in a current frame is not transmitted from an encoding side;
selecting, from among multiple candidate reference frames, a frame(s) to be referenced to in the prediction mode;
determining motion vector information to be used in the prediction mode; and
performing prediction processing using the selected reference frame and the determined motion vector information;
wherein when candidate blocks within a current frame and adjacent to a current block include blocks that use backward reference frames, a backward reference frame having a smallest index number is selected as the backward reference frame for the current block from the backward reference frames that said blocks using the backward reference frames have.