解决编译OpenCV Contrib时提示的文件缺少错误. 将文件解压复制到OpenCV源码文件根目录中的隐藏文件夹.cache/xfeatures2d/下. 错误内容: ~/opencv_contrib/modules/xfeatures2d/src/boostdesc.cpp:673:20: fatal error: boostdesc_bgm.i: No such file or directory