运行opencv自带的例子SURF_detector，结果出错了。
error LNK2019: 无法解析的外部符号 "public: __thiscall cv::SURF::SURF(double,int,int,bool,bool)" (??0SURF@cv@@QAE@NHH_N0@Z)，该符号在函数 _main 中被引用
解决方案：VS2010中，设置项目属性->链接器->输入->附加依赖项里面添加上添加库文件opencv_nonfree244d.lib.
其中244为对应的OpenCV版本。
opencv_calib3d2410d.lib
opencv_contrib2410d.lib
opencv_core2410d.lib
opencv_features2d2410d.lib
opencv_flann2410d.lib
opencv_gpu2410d.lib
opencv_highgui2410d.lib
opencv_imgproc2410d.lib
opencv_legacy2410d.lib
opencv_ml2410d.lib
opencv_objdetect2410d.lib
opencv_ts2410d.lib
opencv_video2410d.lib
opencv_nonfree2410d.lib
