经典的sift算法实现，利用简单的VC2005环境加上Opencv库，实现图像的特征点查找，并显示出图像的异同处-Classic sift algorithm, using simple VC2005 environment and Opencv library, find the feature points of the image, and display the image at the similarities and differences

用vc6.0实现的尺度不变变换SIFT特征点检测算法。-Vc6.0 achieved with scale invariant feature transform SIFT detection algorithm.

用vc实现的另一个sift特征点检测算法，从别处下载得到的，基于opencv实现。-With another sift feature detection algorithm vc implemented elsewhere downloaded based on opencv implementation.