基于opencv的SIFT特征提取：捕捉摄像头视频，进行角点匹配-SIFT-based feature extraction opencv: camera, video capture, carried corner matching

在安卓NDK下实现了图像的sift检测，可以圈出特征点，并且能够匹配二幅图像，需要opencv库支持。-In the android to realize the image under the NDK sift detection, can circle the feature points, and the ability to match two images, need opencv library support.