Quick extracting keyframes from compressed video

Keyframe is widely used in applications such as non-linear browsing, video content analysis and so on. How to obtain keyframes from video rapidly becomes very important. In this paper, a scheme to extract keyframes from compressed video stream is proposed. It firstly computes the similarity set of adjacent I frames´ DC images, secondly applies clustering algorithm to the similarity set, and finally selects keyframes with the clustering results. The experiment results show that our method is able to extract proper keyframes from test video files fast and easily.