随着计算机技术和电视技术的发展，数字视频节目日益增多.为了迅速了解视频节目的内容，提出了建立基于数字视频广播 (DVB)的视频关键帧浏览系统的方案.该系统首先利用 MPEG压缩视频提供的压缩参数，直接将视频序列划分成以镜头为单位的视频片段 ;然后提取每个镜头中的第一个 I帧作为关键帧，重构其 DC图象 ;最后，根据 DVB标准，通过扩展 SI表实现对这些视频关键帧进行封装的数据结构，从而实现电视台对视频关键帧的发送和接收.文中给出了前端系统结构示意图和基于关键帧 DC图象的快速浏览实例.由于该系统直接利用了压缩参数，从而减少了解压缩的开销，具有计算代价小，浏览速度快的特点.

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.