问题: undefined reference to `cv::applyColorMap(cv::_InputArray const&, cv::_OutputArray const&, int)’
【caffe安装|caffe安装 opencv2.4】解决方案：
修改 caffe_root/cmake/Dependencies.cmake，添加 contrib:
# ---[ OpenCV
if(USE_OPENCV)
find_package(OpenCV QUIET COMPONENTS core highgui imgproc imgcodecs contrib)
if(NOT OpenCV_FOUND) # if not OpenCV 3.x, then imgcodecs are not found
find_package(OpenCV REQUIRED COMPONENTS core highgui imgproc)
endif()
