说明：  OpenCV视频教程,目标检测与跟踪,车辆特征识别,人脸识别,字符识别,特征提取, 图像分割,手势识别,计算机视觉视频教程,opencv基础知识
(OpenCV is released under a BSD license and hence it’s free for both academic and commercial use. It has C++, C, Python and Java interfaces )