中文摘要：

关键帧提取技术是基于内容视频检索的基础,关键帧的提取一方面减少了视频索引的数据量,同时也为检索视频提供了一个组织框架。在归纳分析典型的视频关键帧提取技术的基础上,针对交通视频的独特性提出了一种基于虚拟检测线的关键帧提取方法,并在此过程中提出改进的基于双差分法的背景建模以及基于检测线变化的局部背景更新。实验结果证明,该方法能够依据交通视频内容的复杂程度有效地提取出最具代表性的关键帧,具有较高的提取效率和鲁棒性。

英文摘要：

Key frame extraction,which can dramatically reduce the data of the video indexing,and provide a framework for video retrieva1,is a basic process for CBVR(content-base video retrieval).In this paper,first briefly discuss and analyze the existing typical approaches of key frame extraction,and then aiming at traffic video,present a key frame extraction method based on virtual detection line,meanwhile,propose a method based on Double Difference to initialize background and a method to update background based on...