MOTION COMPENSATION MOVING IMAGE CODER AND MOTION COMPENSATION MOVING IMAGE DECODER

摘要

PPROBLEM TO BE SOLVED: To provide a method for motion estimation with adaptive motion accuracy including technique for computing motion vectors of high pixel accuracy with a minor increase in computation. PSOLUTION: A coder carries out motion compensation by using the motion vectors expressed by a plurality of fractional accuracies expressed by 1/N pel (N is an integer), performs variable-length coding for accuracy apart from the motion vectors and codes the motion vectors at everty block. Motion compensation is carried out by using a second filter of more computational complexity according to second accuracy of higher accuracy after execution according to first accuracy by a first filter. In a decoder, coded data is decoded. Accuracy is set at frame unit. Although the same accuracy is used for all the motion vectors in one frame, different accuracies are used for different frames. A motion vector of a coding object is equivalent to a product of accuracy to vector values of coded data and is interpreted as different values according to accuracy. PCOPYRIGHT: (C)2011,JPO&INPIT