Abstract
Due to the temporal correlation of the image sequence, the motion vector of a block is highly related to the motion vector of the same coordinate block in the previous image frame. If we can obtain useful and enough information from the motion vector of the same coordinate block of the previous image frame, the total number of search points used to find the motion vector of the current block may be reduced significantly. Using that idea, an effcient predicted direction search algorithm(PDSA)for block matching motion estimation is proposed in this paper. The proposed method utilizes the predicted direction which is obtained from the motion vector of the same coordinate block of the previous frame to obtain a prediction motion vector, namely the initial search point. Computer simulation results show that the proposed search algorithm gives better prediction performance than the other fast search algorithms, such as 3SS, 4SS, UCBDS, and PSA, in terms of both subjective quality and PSNR value.
