基于H.264运动估计算法的视频监控研究

发布时间：2018-01-07 00:08

本文关键词：基于H.264运动估计算法的视频监控研究　出处：《湖北工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：目前,随着我国经济迅猛发展,人民生活水平逐步提高,安全防范意识在人们心中逐渐增强。视频监控是整个安防系统的核心之一,它是现代通信技术与传统视频技术结合的产物,在国防、交通、医疗、水利、教育、工业生产等领域也得到了非常广泛的应用。近年来,嵌入式技术、视频图像处理、3G/4G网络的快速发展,促使视频监控的发展达到了一个新的高度,但同时,视频监控采集的海量数据为存储带来了巨大的挑战。现在主流的家用视频监控系统采用SD卡存储视频数据,此方式存在的弊端显而易见,首先,扩展性差,SD卡容量有限,也不支持在线扩容;其次,数据安全没保障,SD卡易坏也易遗失。另外,在视频图像编码方面,运动估计的主要任务是快速得到比较准确的运动向量,在整个视频编码过程中,运动估计是占用时间最长、消耗资源最多的环节。虽然已经有了很多经典的算法,如Diamond search algorithm、Hexagonal search algorithm、UMHexagonS,运动估计仍是视频压缩编码的瓶颈,特别是有运动的视频图像。在视频监控发展趋势一片大好的形势下,选用高性能、大容量的存储方案,优化已有的视频编码算法,有利于各类视频监控应用的整合,提高整个系统的工作效率。本课题的意义在于,针对小规模的视频监控系统,基于FreeNAS操作系统,利用电脑和硬盘搭建一套类似NAS的存储装置用作视频数据的存储,成本低廉。同时,通过研究已有视频编码算法UMHexagonS的优缺点,在此基础上提出了一些优化思路,并在FFmpeg视频采集编码中实现算法的优化,由仿真实验结果发现,图像质量在基本不受影响的情况下,能提高视频实时性和降低传输码率。
[Abstract]:At present, with the rapid development of China's economy, the standard of living of the people is gradually improved, and the awareness of security and prevention is gradually strengthened in people's minds. Video surveillance is one of the core of the whole security system. It is the result of the combination of modern communication technology and traditional video technology. It has been widely used in the fields of national defense, transportation, medical treatment, water conservancy, education, industrial production and so on. In recent years, embedded technology has been applied. The rapid development of 3G / 4G network in video image processing promotes the development of video surveillance to a new height, but at the same time. The huge amount of data collected by video surveillance brings a great challenge to storage. Now the mainstream home video surveillance system uses SD card to store video data. The disadvantages of this way are obvious. First of all, the scalability is poor. SD card capacity is limited, also does not support online expansion; In addition, in video image coding, the main task of motion estimation is to quickly get more accurate motion vector, in the whole process of video coding. Motion estimation is the most time-consuming and resource-consuming link, although there are many classical algorithms, such as Diamond search algorithm. Hexagonal search algorithm is still the bottleneck of video compression coding. Especially the moving video image. In the video surveillance development trend of a good situation, the choice of high performance, large capacity storage scheme, optimize the existing video coding algorithm. It is beneficial to the integration of all kinds of video surveillance applications and improve the working efficiency of the whole system. The significance of this project is that the small scale video surveillance system is based on FreeNAS operating system. Using computer and hard disk to build a storage device similar to NAS to store video data, the cost is low. At the same time, by studying the advantages and disadvantages of the existing video coding algorithm UMHexagonS. On this basis, some optimization ideas are put forward, and the algorithm is optimized in FFmpeg video capture coding. The simulation results show that the image quality is basically unaffected. It can improve the real-time video and reduce the transmission rate.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN948.6

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