基于快速边界强度判定的H.264去块滤波新算法

在H.264/AVC标准中,去块滤波是提高图像质量和压缩效率有效手段,但其计算复杂度所占时间极大.在整个滤波过程中,边界强度(Bs)的计算复杂度的计算时间几乎占90％,在重点分析H.264的去块滤波的Bs判定准则之后,提出一种基于快速Bs判定的H.264去块滤波优化算法(FF算法).通过实验数据分析,FF算法能够有效地确保视频序列的编解码质量,并比JM中基准算法降低了近50％的Bs判定时间及近20％的滤波时间；与其他改进滤波算法相比也有自身优势,因此,FF算法能够有效地降低去块滤波中的计算复杂度,有助于视频序列实时传输的实现.

A new algorithm for H.264 de-blocking filter based on quick decision of boundary strength

In the H.264/AVC standard,the de-blocking filtering is an effective way to improve the image quality and compression efficiency,but it contains a very high computational complexity.In the whole filtering process,the computation of the boundary strength(Bs) is the largest part,which is almost 90%.A new algorithm for H.264 de-blocking filter based on quick decision of Bs is proposed after analyzing the theory of Bs decision.The experimental data show that the FF algorithm is able to maintain the quality of codec video images,and compared with standard algorithm in JM,it can reduce nearly 50% of Bs decision time and nearly 20% of filtering time.Then,compared with any other improved filtering algorithms,it has its own advantages.Therefore,the FF algorithm can effectively decrease the computational complexity of de-blocking filter and can promote the realization of real-time transmission of video sequences.