中文摘要：

与传统压缩标准相比，H．264虽然具有更高的压缩性能，但其编码复杂度的大幅增加限制了它的实时应用．为此，文中提出了一种基于结构相似度的快速运动估计算法（FMEBSS）．该算法利用结构相似度的特性，通过在运动估计过程中设置阈值，减少不必要的运动搜索点，简化复杂的搜索模式，从而达到了减小运动估计复杂度、改善压缩性能的目的．实验结果表明，在保证压缩质量不下降的前提下，该算法可以有效节约编码时间，同时压缩比也得以改善．

英文摘要：

Although H. 264 video coding is of higher coding efficiency than the traditional video coding standards, its application is limited due to the great increase in coding complexity. For the purpose of reducing the complexity, a novel fast motion estimation algorithm based on structural similarity （SSIM） and marked as FMEBSS is proposed. In the proposed algorithm, the characteristics of SSIM are considered, some thresholds are set for the motion estimation process and the unnecessary searching positions are eliminated, thus simplifying the searching mode, reducing the complexity of motion estimation and improving the coding performance. Experimental results indicate that the proposed algorithm effectively saves the coding time and improves the compression ratio without reducing the video quality.