特征提取和匹配

代码说明：

应用背景图像的特征提取和特征匹配，用sift算法，SIFT特征检测算法 ，检测的特征点具有平移、旋转、尺度变化不变性，实验效果较好。-The SIFT feature detect algorithm.The feature is scale- and rotation-invariant.The algorithm performs well in experiments.关键技术sift提取特征，然后进行匹配。基于SIFT的图像配准程序 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-Hot and difficult of the current research areas of domestic and foreign feature point matching based the SIFT image registration program SIFT feature matching algorithm is its ability to match between the two images, can handle translation, rotation, affine transformation case match problem, even in some degree images taken at any angle with more stable feature matching ability