| 摘要 |
PROBLEM TO BE SOLVED: To assign a time slot efficiently and to read a reference image for detecting a moving vector from a memory. SOLUTION: A macro block input image from a memory 14 is stored to a buffer 15 and a reference image for a retrieval range consisting of a plurality of retrieval areas with respect to the macro block are stored to a buffer 16 respectively and a motion vector retrieval circuit 17 detects an optimum motion vector from the input image and the reference image. When the detection of the motion vector is finished, the input image of a succeeding macro block is stored in the buffer 15, a reference image for one retrieval area is rewritten in the buffer 16 to set a new retrieval range and to detect the motion vector. When the retrieval range is protruded from the right end of a screen, the contents of the buffer 16 are rewritten by using part of reference image in other retrieval range at the right end of the screen, corresponding thereto and the processing by the motion vector retrieval circuit 17 with the reference image is inhibited by a retrieval range limit circuit 19. |
