ENCODER AND MOTION DETECTOR FOR DYNAMIC IMAGE

PURPOSE:To provide a dynamic image encoder capable of compensating the motion of the whole image and that of an object by a camera operation and remarkably reducing the code quantity of a motion vector. CONSTITUTION:This encoder is equipped with a motion parameter detection circuit 21 which detects a global motion parameter representing the motion of a designated area in an image frame. a predictive image generation circuit 23 which performs inter-motion compensation frame prediction by using the global motion parameter and generates a predictive image signal, a predictive error detection circuit 24 which detects difference between the predictive image signal 107 and an input dynamic image signal, and an area division circuit 25 which divides the area into the one in which a predictive error exceeds a threshold value and the one in which it is less than the threshold value. The detection of the motion parameter, the generation of the predictive image, the detection of the predictive error and the operation of area division are performed for the area with predictive error over the threshold value repeatedly for prescribed number of times, and information representing the notion parameter, predictive error and area obtained finally are encoded.