IEEE Transactions on Circuits and Systems for Video Technology
A Novel Four-Step Search Algorithm for Fast Block Motion Estimation
作者:
Po， L.M. and Ma， W.C.
关键词:
Motion estimation； Transform coding； Motion compensation； Redundancy； Image sequences； Computational modeling； Video compression； Discrete cosine transforms； MPEG standards； Testing
摘要:
Based on the real world image sequence's characteristic of center-biased motion vector distribution, a new four-step search (4SS) algorithm with center-biased checking point pattern for fast block motion estimation is proposed in this paper. A halfway-stop technique is employed in the new algorithm with searching steps of 2 to 4 and the total number of checking points is varied from 17 to 27. Simulation results show that the proposed 4SS performs better than the well-known three-step search and has similar performance to the new three-step search (N3SS) in terms of motion compensation errors. In addition, the 4SS also reduces the worst-case computational requirement from 33 to 27 search points and the average computational requirement from 21 to 19 search points, as compared with N3SS.
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