QT+cmake+opencv

到官网下载qt-opensource-windows-x86-mingw492-5.5.0文件，执行该文件，选择默认安装即可实现QT的安装（安装在d:/opencv/qt目录下），该文件封装好了Qt
libraries、Qt Creator。

到官网http://opencv.org/downloads.html下载OpenCV
for Windows3.0版本——opencv-3.0.0exe。执行该文件，把它解压到d:/opencv/opencv。

下载cmake-3.4.0-rc1-win32-x86文件。安装cmake，安装在d:/opencv目录下。

 

设置系统的环境变量，即把d:\opencv\Qt\Qt5.5.0\Tools\mingw492_32\bin加入系统的Path环境变量中

 

点击CMake(cmake-gui)图标，执行CMake，在Where
is the source code栏和Where to build thebinaries栏中分别d:/opencv/opencv/soureces和d:/opencv/MinGW。d:/opencv/MinGW为编译后库文件所存放的目录，需要自己创建该目录。然后点击configure按钮，打开新的窗口，在Specify
the generator for this project下选择MinGW Makefiles，然后选择Specify native compilers，点击Next按钮，打开新的窗口，在C一栏中填写d:/opencv/Qt/Qt5.5.0/Tools/mingw482_32/bin/gcc.exe，在C++一栏中填写d:/opencv/Qt/Qt5.5.0/Tools/mingw482_32/bin/g++.exe，Fortran不填写。然后点击Finish按钮，开始配置，这时会出现如下的类似错误提示：

CMake Error: CMake was unable to find abuild program corresponding to "MinGW Makefiles".  CMAKE_MAKE_PROGRAM is not set.  You probably need to select a different
buildtool.

CMake Error: CMake was unable to find abuild program corresponding to "MinGW Makefiles".  CMAKE_MAKE_PROGRAM is not set.  You probably need to select a different
buildtool.

CMake Error: Error required internal CMakevariable not set, cmake may be not be built correctly.

Missing variable is:

CMAKE_CXX_COMPILER_ENV_VAR

CMake Error: Could not find cmake modulefile: C:/opencv/MinGW/CMakeFiles/3.0.1/CMakeCXXCompiler.cmake

CMake Error: Error required internal CMakevariable not set, cmake may be not be built correctly.

Missing variable is:

CMAKE_C_COMPILER_ENV_VAR

CMake Error: Could not find cmake modulefile: C:/opencv/MinGW/CMakeFiles/3.0.1/CMakeCCompiler.cmake

Configuring incomplete, errors occurred!

找到Name为CMAKE_MAKE_PROGRAM的一项，把它的Value填写为d:/opencv/Qt/Qt5.5.0/Tools/mingw482_32/bin/mingw32-make.exe即可。再次点击Configure，这时不会提示任何错误，表明配置成功。

我们还需要把QT加上，找到WITH，把它下面的WITH_QT和WITH_OPENGL选上，再次Configure。这时会出现类似下面的错误提示：

CMake Error atC:/CMake/share/cmake-3.0/Modules/FindQt4.cmake:1316 (message):

 Found unsuitable Qt version "" from NOTFOUND, this coderequires Qt 4.x

Call Stack (most recent call first):

 cmake/OpenCVFindLibsGUI.cmake:34 (find_package)

 CMakeLists.txt:466 (include)

找到QT_QMAKE_EXECUTABLE，它的值填写为：d:/opencv/Qt/Qt5.5.0/mingw482_32/bin/qmake.exe

找到QT_MKSPECS_DIR，它的值填写为：d:/opencv/Qt/Qt5.5.0/5.5/mingw482_32/mkspecs

找到QT_QTCORE_LIBRARY_DEBUG，它的值填写为：d:/opencv/Qt/Qt5.5.0/5.5/mingw482_32/bin/Qt5Cored.dll

找到QT_QTCORE_LIBRARY_RELEASE，它的值填写为d:/opencv/Qt/Qt5.5.0/5.5/mingw482_32/bin/Qt5Core.dll

找到QT_QTCORE_INCLUDE_DIR，它的值填写为d:/opencv/Qt/Qt/5.5.0/5.5/mingw482_32/include/QtCore/5.3.1/QtCore

再次点击Configure，这时会出现类似下面的错误提示：

CMake Error atC:/CMake/share/cmake-3.0/Modules/FindQt4.cmake:1316 (message):

 Found unsuitable Qt version "5.3.1" from

 C:/Qt/Qt5.3.1/5.3/mingw482_32/bin/qmake.exe, this code requires Qt 4.x

Call Stack (most recent call first):

 cmake/OpenCVFindLibsGUI.cmake:34 (find_package)

 CMakeLists.txt:466 (include)

在Ungrouped Entries下找到Qt5Concurrent_DIR，Qt5Core_DIR，Qt5Gui_DIR，Qt5Test_DIR，Qt5Widgets_DIR，Qt5OpenGL_DIR，它们的Value分别填写为：

d:/opencv/Qt/Qt5.5.0/5.5/mingw482_32/lib/cmake/Qt5Concurrent

d:/opencv/Qt/Qt5.5.0/5.5/mingw482_32/lib/cmake/Qt5Core

d:/opencv/Qt/Qt5.5.0/5.5/mingw482_32/lib/cmake/Qt5Gui

d:/opencv/Qt/Qt5.5.0/5.5/mingw482_32/lib/cmake/Qt5Test

d:/opencv/Qt/Qt5.5.0/5.5/mingw482_32/lib/cmake/Qt5Widgets

d:/opencv/Qt/Qt5.5.0/5.5/mingw482_32/lib/cmake/Qt5OpenGL

再次Configure，这时配置完成，不会出现任何错误提示。虽然会有许多警告，如This
warning is for project developers.  Use -Wno-dev to suppress it.，但不用去管，按Generate。Generate完成后，关闭CMake窗口。

到 d:/opencv/opencv/sources/cmake 下找到 OpenCVCompilerOptions.cmake

打开文件OpenCVCompilerOptions.cmake，找到add_extra_compiler_option(-Werror=non-virtual-dtor)，将其注释掉变为#add_extra_compiler_option(-Werror=non-virtual-dtor)  （可以规避在编译中遇到的编译器问题）

打开系统的命令终端，进入d:\opencv\MinGW目录，执行mingw32-make命令（直接输入mingw32-make），这需要一段时间，该命令执行完后，再执行mingw32-make
install命令。这样可用于Qt的opencv库文件就生成了。

再次添加系统的Path环境变量，内容为：d:\opencv\Qt\Qt5.5.0\5.5\mingw482_32\bin;d:\opencv\MinGW\bin。

以后我们用Qt Creator编译opencv的时候，在创建一个新工程后，还需要在该工程的工程文件.pro文件内添加下列语句：

INCLUDEPATH+=d:\opencv\opencv\build\include\opencv\

d:\opencv\opencv\build\include\opencv2\

       d:\opencv\opencv\build\include

 

LIBS+=d:\opencv\MinGW\lib\libopencv_calib3d249.dll.a\

 d:\opencv\MinGW\lib\libopencv_contrib249.dll.a\

  d:\opencv\MinGW\lib\libopencv_core249.dll.a\

  d:\opencv\MinGW\lib\libopencv_features2d249.dll.a\

  d:\opencv\MinGW\lib\libopencv_flann249.dll.a\

  d:\opencv\MinGW\lib\libopencv_gpu249.dll.a\

  d:\opencv\MinGW\lib\libopencv_highgui249.dll.a\

  d:\opencv\MinGW\lib\libopencv_imgproc249.dll.a\

  d:\opencv\MinGW\lib\libopencv_legacy249.dll.a\

  d:\opencv\MinGW\lib\libopencv_ml249.dll.a\

  d:\opencv\MinGW\lib\libopencv_objdetect249.dll.a\

  d:\opencv\MinGW\lib\libopencv_video249.dll.a