MOVING VECTOR PREDICTIVE CODING METHOD AND MOVING VECTOR DECODING METHOD, PREDICTIVE CODING DEVICE AND DECODING DEVICE, AND STORAGE MEDIUM STORED WITH MOVING VECTOR PREDICTIVE CODING PROGRAM AND MOVING VECTOR DECODING PROGRAM

摘要

A moving vector predictive coding method by which the amount of codes produced for a moving vector is reduced and the efficiency of the moving vector prediction is improved; a moving vector decoding method; predictive coding and decoding devices; and a recording medium stored with a moving vector predictive coding and decoding programs. When a motion compensation mode for a small block to be coded is a global motion compensation method, and a coding mode for a coded small block is an interframe coding mode, while a motion compensation mode is a global motion compensation method, a moving vector of a translation moving model is determined for each pixel of the coded small block from the global moving vector (steps S1-S5). Next, from the moving vector of each pixel of the coded small block, a representative moving vector is calculated (step S6) and taken as a predicted vector. Finally, the prediction error is calculated for each component of the moving vector and then coded (step S7, S8).