1. 下载 opencv-2.4.9.exe
下面地址可以用迅雷：
https://downloads.sourceforge.net/project/opencvlibrary/opencv-win/2.4.9/opencv-2.4.9.exe?r=http%3A%2F%2Fsourceforge.net%2Fprojects%2Fopencvlibrary%2Ffiles%2Fopencv-win%2F2.4.9%2F&ts=1409995259&use_mirror=iwebhttps://
