说明：  SIFT的技术文档，SIFT特征匹配算法是目前国内外特征点匹配研究领域的热点与难点，其匹配能力较强，可以处理两幅图像之间发生平移、旋转、仿射变换情况下的匹配问题，甚至在某种程度上对任意角度拍摄的图像也具备较为稳定的特征匹配能力
(SIFT feature matching algorithm is matching feature points at home and abroad in the research field of the hot issues and difficulties, and the matching with the strong ability to deal with two images happened between translation, rotation, affine transformation of matching problem, even in some degree of arbitrary Angle shot of the image and also has a relatively stable feature matching ability )