中文说明：SIFT匹配函数改进版（能显示匹配点序号，返回匹配点坐标），基于siftDemoV4改进。文件夹下有原SIFT关键点提取程序（非原创），原匹配函数为match，改进的匹配函数为matches，改进的匹配函数中参数distRatio和原函数效果一样。
English Description：
SIFT matching function improved (show matching serial numbers and returns the matching coordinates), based on siftDemoV4. Folder under the SIFT key extraction program (non-original), the original matching function for the match, improving match function matches, improved matching parameter in the function distRatio and primitive function as well.