IMAGE CODER AND METHOD

摘要

PROBLEM TO BE SOLVED: To enhance the image quality by setting properly a search range so as to predict a motion with high accuracy, even if a large motion takes place, a time change of a moving speed is irregular, acceleration, or deceleration takes place. SOLUTION: A stored retrieval field 102 in a memory 1 is given to a simple motion detection circuit 2. The simple motion detection circuit 2 outputs a movement amount 105 and is given to a control discrimination circuit 4. A motion detection circuit 3 receives a current frame 103 and a retrieval frame 104, to obtain a final motion vector 107 used actually for motion compensation. The control discrimination circuit 4 gives a setting parameter 106 for a search range depending on a predicted motion amount, by the simple moving vector 105 to the motion detection circuit 3, where the search range is set.