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在很多多媒体系统中都需要从视频流中捕获单帧图像并对其进行实时压缩。本文首先介绍了在Windows平台下开发视频采集程序的基本原理，然后给出了JPEG文件压缩的基本原理。在此基础上，介绍了基于VFW的对视频流中单帧静态图像进行压缩的方法。
In many multimedia systems, it is necessary to capture a single frame of video from a video stream and compress it in real time. This paper first introduces the basic principle of developing video capture program under Windows platform, and then gives the basic principle of JPEG file compression. On this basis, the method of compressing single frame still image in video stream based on VFW is introduced.