A novel approach to fast multi-block motion estimation for H.264 video coding
ICME '03 Proceedings of the 2003 International Conference on Multimedia and Expo - Volume 2
A novel hexagon-based search algorithm for fast block motion estimation
ICASSP '01 Proceedings of the Acoustics, Speech, and Signal Processing, 2001. on IEEE International Conference - Volume 03
An efficient three-step search algorithm for block motion estimation
IEEE Transactions on Multimedia
Early detection method of all-zero integer transform coefficients
IEEE Transactions on Consumer Electronics
A new diamond search algorithm for fast block-matching motion estimation
IEEE Transactions on Image Processing
IEEE Transactions on Circuits and Systems for Video Technology
Highly efficient predictive zonal algorithms for fast block-matching motion estimation
IEEE Transactions on Circuits and Systems for Video Technology
IEEE Transactions on Circuits and Systems for Video Technology
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Fractional pixel motion estimation is applied in H.264 to achieve more accurate motion vectors and higher compression efficiency. It, however, distinctly increased complexity in the procedure of motion estimation. In this paper, we propose an adaptive and fast fractional pixel search algorithm (AFFPS) to reduce the computation load of motion estimation in H.264. Since the sum of absolute difference (SAD) surface is unimodal within the range of +/-1 pixel, it can be approximated by line functions in a small area around the optimum motion vector. A novel bypass strategy for fractional pixel search based on these line functions is first proposed to skip unnecessary fractional pixel search. Then, an all-zero block (AZB) detection-based strategy is proposed to terminate ineffective fractional pixel search early. The proposed fractional search algorithm is presented, which adopts the two strategies and greatly improves the center-biased fractional pixel search (CBFPS) method. Simulation results show that the proposed algorithm can reduce more than 71% of the fractional pixel search points and still maintain similar coding efficiency.