在编译代码的时候，报错：不能找到OpenCV库。解决方法就是在Cmakelists.txt中插入：

set(CMAKE_MODULE_PATH  "FindOpenCV.cmake文件所在的路径")

至于这个FindOpenCV.cmake文件，就看你电脑中OpenCV的位置。一般在OpenCV/build里边，如果里边没有 FindOpenCV.cmake文件，但是有OpenCVConfig.cmake文件，就把这个文件复制一份，将备份的名字改为FindOpenCV.cmake就可以了。

CMake Error at CMakeLists.txt:15 (find_package):
  Could not find module FindOpenCV.cmake or a configuration file for package
  OpenCV.

  Adjust CMAKE_MODULE_PATH to find FindOpenCV.cmake or set OpenCV_DIR to the
  directory containing a CMake configuration file for OpenCV.  The file will
  have one of the following names:

    OpenCVConfig.cmake
    opencv-config.cmake