DG Lowe的尺度

代码说明：

D.G lowe 的尺度不变特征转换算法（SIFT） 在基于opencv和OpenGL的源码基础上增加了图像的保存功能。用于对图像的尺度不变特征的提取以及图像特征点的匹配。-DG lowe the scale-invariant features of the conversion algorithm (SIFT) and OpenGL-based opencv source code based on the increase in the preservation of image features. Used to image the scale-invariant feature extraction and image feature points of the match.