Picture information decoding method and picture information encoding method

摘要

A picture information decoding method enables to switch a pixel precisions of a motion vector while compatibility with conventional standard is maintained and a delay occurred in parsing a picture parameter set is prevented, and it is judged whether or not a half_pixel_mv_flag indicating the pixel precision of the motion vector used for picture decoding is included as a last parameter in a plurality of parameters of a picture parameter set, and in the case where the half_pixel_mv_flag is included, the half_pixel_mv_flag is decoded.