基于H.264的改进阈值的可变自适应十字搜索算法

H.264视频编解码标准的算法复杂度高,不能满足视频监控和无线传输中要求的高压缩比、低码率和实时性的要求,通过分析可知运算量最大的是运动估计模块,本文对该模块的算法进行优化。在ARPS算法的基础上结合预测的初始点和自适应调节臂长的搜索策略的优点,采用可变阈值的早期终止策略和简单的搜索模板的算法。实验表明该算法在有效减少搜索点数的情况下并不会对图像质量产生较大的影响,提高了运动估计算法的搜索速率和鲁棒性。

Improved Threshold Variable Adaptive Rood Pattern Searching Algorithm of Block Matching Estimation Based on H. 264

Because the algorithm of H. 264 video codec standard has high complexity, it can not meet the requirement of the video surveillance and wireless transmission which require high compression ratio, low bit-rate and real-time application. This paper, according to ARPS algorithm which has the advantages of the initial point and the adaptive arm length search strategy, uses varia- ble threshold for early termination of policies and template simple search algorithm. Experimental results show that the algorithm is effective in reducing the number of search points, does not have a greater impact on image quality, improves the motion estima- tion algorithm search rate and robustness.