实现对图像的sift特征点检测，能够对图像添加噪声、旋转、缩放，检验sift算法效果，实现两幅图像间的sift特征点匹配。-Sift feature point detection on the image, you can add noise on the image, rotate, zoom, testing the effect of sift algorithm, sift feature point matching between two images.