A new adaptive fast motion estimatio

A new adaptive fast motion estimation algorithm based on local motion similarity degree (LMSD)

In the motion vector field adaptive search technique (MVFAST) and the predictive motion vector field adaptive search technique (PMVFAST), the size of the largest motion vector from the three adjacent blocks (left, top, top-right) is compared with the threshold to select different search scheme. But a suitable search center and search pattern will not be selected in the adaptive search technique when the adjacent motion vectors are not coherent in local region. This paper presents an efficient adaptive search algorithm. The motion vector variation degree (MVVD) is considered a reasonable factor for adaptive search selection. By the relationship between local motion similarity degree (LMSD) and the variation degree of motion vector (MVVD), the motion vectors are classified as three categories according to corresponding LMSD; then different proposed search schemes are adopted for motion estimation. The experimental results show that the proposed algorithm has a significant computational speedup compared with MVFAST and PMVFAST algorithms, and offers a similar, even better performance.

作 者： LIU Long HAN Chongzhao BAI Yan   作者单位： School of Electronics & Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China  刊 名： 自然科学进展（英文版）  SCI 英文刊名： PROGRESS IN NATURAL SCIENCE  年，卷(期)： 2005 15(12)  分类号： O1  关键词： motion estimation   motion vector   video coding   local motion  

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