图像特征提取以及匹配，sift代码。可用于图片检索中，同比SURF，其算法可以较好的识别图像中文字-Image feature extraction and matching, sift the code. Can be used for image retrieval, up by SURF, the algorithm can better identify the image text

本代码采用sift算法对目标物体进行追踪(追踪效果很好)-This code uses the SIFT algorithm to track the target object (tracking effect is very good)

sift tutorial is used for support vector machines needed for verification