The Implementing of Browsing Key-frames of Video Based on DVB
基于DVB的视频关键帧浏览系统的实现

With developing of computer technology and TV technology, the amount of digital video program is larger and larger. In order to find out the content of the video program rapidly, a system of browsing video key-frames based on DVB(digital video broadcasting) is presented in the paper. Firstly, the video sequences are segmented into shots directly by making use of compressed parameters provided by MPEG compressed video, such as DCT coefficients, motion vector, the types of macroblock and so on. Secondly, the first I-frame is selected as key-frame, and DC image of the I-frame is reconstructed. Finally, based on the standard of DVB, the SI tables are extended to realize the data structure of encapsulating the key-frames so that the key-frames of video in TV stations can be picked-up and transferred. The system diagram and a real example of rapid browsing prototype based on DC image of key-frame are offered in the last of the paper. Because the method that presented in the paper makes use of the compressed parameters provided by MPEG compressed video and reducing the cost of decompressed, the method has the feature of lower computing cost and faster browsing.