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SIFT feature matching algorithm is the matching feature points at home and abroad a hot area of research and difficult, and its ability to match, between two images can be processed translation, rotation, affine transformation in case of matching problems, and even to some extent on arbitrary angle images also have a more stable feature matching ability. The algorithm is currently foreign materials more, but Chinese is introduced less. To this end I wrote this document to help domestic researchers as quickly as possible, in order to experience the fastest feature matching algorithm is the matching feature points at home and abroad a hot area of research and difficult, and its ability to match, can handle translation between two images, rotation, affine transformation to match the case problems, and even to some extent arbitrary angle images will also have a more stable feature matching ability. The algorithm is currently foreign materials more, but Chinese i