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总览 评价 张蕴华 , 李绍胜 * ( 北京邮电大学信息与通信工程学院,北京 100876; ) 摘要: 在视频编码器中,运动估计是计算量最大的一个模块。但因其可以有效的减少帧间的相关性,因此被广泛用于各种视频编码标准中。运动估计技术主要分为两大类:象素递
张蕴华, 李绍胜*
(
北京邮电大学信息与通信工程学院,北京 100876; )
摘要:
在视频编码器中,运动估计是计算量最大的一个模块。但因其可以有效的减少帧间的相关性,因此被广泛用于各种视频编码标准中。运动估计技术主要分为两大类:象素递归法和块匹配法。考虑到计算复杂度和实时要求,块匹配法已成为目前最常用的方法。本文首先介绍了运动估计和块匹配的概念和思想,然后详细介绍了块匹配的搜索算法的实现思想。最后根据块匹配算法设计了三个程序分别仿真,找出块匹配算法的复杂度和精确度与块大小和搜索窗口大小的关系,同时比较不同的块匹配算法性能的优劣。
关键词:
视频编码;运动估计;块匹配算法
ZHANG Yunhua, LI Shaosheng*
(
Information and telecommuniation Engineer School, Beijing University of Posts and Telecommnications, Beijing 100876; )
Abstract:
The calculation of motion estimation is one of the largest module in the video encoder. However, it can reduce the correlation between frames effectively, so it is widely used in a variety of video coding standards. There are two main categories of motion estimation, pixel recursive method and the block matching method. Because of the complexity of the real-time requirements, the block matching method has become the most commonly used method. This paper introduces the motion estimation and block matching firstly, and then present the realization of ideas block matching search algorithm in detail. Finally, three programs are simulated to identify the relationship between the block-matching algorithm complexity and accuracy with the block size and the size of the search window, while comparing different block matching algorithms perform.
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