说明：  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 the feature points at home and abroad to match the hot area of research and difficult, and its ability to match, can be dealt with between the two images, translation, rotation, affine transformation in case of matching, even in some degree for any angle images also have relatively stable feature matching capacity)