Video transcoding to support random access in scalable video coding
WSEAS Transactions on Signal Processing
ACIVS'12 Proceedings of the 14th international conference on Advanced Concepts for Intelligent Vision Systems
Efficient smart-camera accelerator: A configurable motion estimator dedicated to video codec
Journal of Systems Architecture: the EUROMICRO Journal
An efficient low-cost FPGA implementation of a configurable motion estimation for H.264 video coding
Journal of Real-Time Image Processing
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For fast motion estimation, a gradient descent search is widely used due to its high efficiency. However, since it does not examine all possible candidates within a search area, it suffers from PSNR degradation for sequences having fast and/or random motions. To alleviate this problem, we propose a hybrid search scheme wherein a hierarchical search scheme is selectively combined with an existing gradient descent search. For the selective combination, we introduce a measure estimating the distance between the current search point and the optimal point. Since this measure greatly reduces the need to perform hierarchical searches, their computational burden is not noticeable in the overall motion estimation while their contribution to the PSNR improvement is considerable. Using the estimated distance, we can also noticeably improve the early termination performance in a local search. Experimental results show that the proposed algorithm outperforms the other popular fast motion estimation algorithms in terms of both PSNR and search speed, especially for sequences having fast or random motions