opencv 实现对视频帧的提取，包括从摄像头获取视频及avi文件获取视频-opencv achieve the extraction of video frames, including video from the camera and get access to video avi files

分析视频文件，得到关键帧，并从关键帧中识别出圆形物体（应用为识别柑橘）-Analysis of video files, get the key frames and key frames from the identified circular object (application for the identification of citrus)

对AVI视频按照自己的需要截图，如从视频中某帧开始截取，间隔几帧截取一帧等功能。-AVI video shots according to their needs, such as in a frame from the video began interception, interception of a function every few frames.