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

图像特征检测小程序，包含各种角点检测，即直线检测-Feature Detection