利用matlab提取视频的最后一副图片，进行特征的提取-Using matlab to extract the last one video image feature extraction

利用matlab对USB摄像头进行提取，但是所得的视频为无压缩视频，因此对硬盘空间要求比较高-USB camera using matlab for extraction, but the resulting video is uncompressed video, so the disk space requirements are relatively high