这里假设CUDA已经装好，但是估计装好CUDA的人是没有下载NPP的，就是这个： NVIDIA Performance Primitives (NPP) library
下载地址：http://developer.nvidia.com/cuda-toolkit-32-downloads
下载下来后解压随便到哪，就一个文件夹SDK
然后开始配置opencv2.2， 勾选WITH_CUDA，点configure，这时候一般会找不到NPP，需要手动配置其路径
找到CUDA_NPP_LIBRARY_ROOT_DIR, 修改其路径为NPP的根目录，比如我为D:/SDK。 上面两项：CUDA_NPP_INCLUDE和CUDA_NPP_LIBRARY不用手动指定，然后再点configure，这时候cmake就能找到NPP了，上面两项也有了正确路径。
在Generate就OK了
接着就是标准步骤各种编译
最后opencv2.2中lib名字改了，转自http://blog.csdn.net/sweetrryy/archive/2010/12/11/6069725.aspx
<release>
opencv_calib3d220.libopencv_contrib220.libopencv_core220.libopencv_features2d220.libopencv_ffmpeg220.libopencv_flann220.libopencv_gpu220.libopencv_highgui220.libopencv_imgproc220.libopencv_legacy220.libopencv_ml220.libopencv_objdetect220.libopencv_ts220.libopencv_video220.lib
<debug>
opencv_calib3d220d.libopencv_contrib220d.libopencv_core220d.libopencv_features2d220d.libopencv_ffmpeg220d.libopencv_flann220d.libopencv_gpu220d.libopencv_highgui220d.libopencv_imgproc220d.libopencv_legacy220d.libopencv_ml220d.libopencv_objdetect220d.libopencv_ts220d.libopencv_video220d.lib
