A new diamond search algorithm for fast block-matching motion estimation
IEEE Transactions on Image Processing
A novel four-step search algorithm for fast block motion estimation
IEEE Transactions on Circuits and Systems for Video Technology
Hexagon-based search pattern for fast block motion estimation
IEEE Transactions on Circuits and Systems for Video Technology
A novel cross-diamond search algorithm for fast block motion estimation
IEEE Transactions on Circuits and Systems for Video Technology
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In this paper, we propose a new adaptive search range motion estimation method for H.264/AVC where search ranges are adjusted by the probabilities of motion vector differences (MVDs). The MVDs are modeled as a discrete Laplace distribution and then its parameter is estimated by the maximum likelihood estimator. The MVDs of neighboring blocks are employed as the samples for the estimation. With the estimated distribution, the search ranges which include the correct MVDs for a prefixed probability are analytically determined. Since the proposed method handles the search ranges instead of search point sampling patterns, it provides very flexible and hardware-friendly approach in motion estimation. Experimental results show that it is very similar to the optimal method (full search algorithm) in PSNR but gives significant reduction in the computational complexity.