编译opencv,contrib库

在参数列表中，将Name为OPENCV_EXTRA_MODULES_PATH的Value设置为opencv_contrib-3.0.0的路径/modules，例如：C:/Users/september/Desktop/opencv_contrib-3.0.0/modules 
可以在search栏中搜索OPENCV_EXTRA_MODULES_PATH变量，如下图。 
 
（2）点击configure，直到configure done。 
重点：configure done后，一定要检查一下参数列表，如果参数列表还有红色标记的条目，就再尝试几次configure，直到所有条目都是白色为止。

可能错误1:unknown cmake command "ocv_define_module"之类的，即存在未知的命令。
原因：可能是opencv版本和opencv_contrib版本不一致，换成一致的就行（本人遇到这个问题的时候，是这样解决的）

可能错误2：在ICV: Downloading ippicv_windows_20141027.zip...时报错
    CMake Error at 3rdparty/ippicv/downloader.cmake:97 (message):
    Call Stack (most recent call first):
    3rdparty/ippicv/downloader.cmake:108 (_icv_downloader)cmake/OpenCVFindIPP.cmake:212 (include)cmake/OpenCVFindLibsPerf.cmake:12 (include)
    CMakeLists.txt:454 (include)
    解决：手动下载ippicv_windows_20141027.zip，保存在opencv/sources/3rdparty/ippicv/downloads/windows-b59f865d1ba16e8c84124e19d78eec57
 

可能错误1:unknown cmake command "ocv_define_module"之类的，即存在未知的命令。
原因：可能是opencv版本和opencv_contrib版本不一致，换成一致的就行（本人遇到这个问题的时候，是这样解决的）

可能错误2：在ICV: Downloading ippicv_windows_20141027.zip...时报错
    CMake Error at 3rdparty/ippicv/downloader.cmake:97 (message):
    Call Stack (most recent call first):
    3rdparty/ippicv/downloader.cmake:108 (_icv_downloader)cmake/OpenCVFindIPP.cmake:212 (include)cmake/OpenCVFindLibsPerf.cmake:12 (include)
    CMakeLists.txt:454 (include)
    解决：手动下载ippicv_windows_20141027.zip，保存在opencv/sources/3rdparty/ippicv/downloads/windows-b59f865d1ba16e8c84124e19d78eec57

（3）点击generate，直到generate done 
generate done后，会在where to build the binaries中设置的目录中生成编译结果。 

VTK is not found. Please set -DVTK_DIR in CMake to VTK build directory, or to VTK install subdirectory with VTKConfig.cmake file

CMake Error at cmake/OpenCVModule.cmake:368 (_glob_locations):
Syntax error in cmake code at

D:/opencv/opencv3-4-1/opencv/sources/cmake/OpenCVModule.cmake:368

when parsing string

D:\opencv\opencv3-4-1\opencv_contrib\opencv_contrib\modules

Invalid escape sequence \o
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

注意路径，\改成/,这个错误就没有啦