【亲测可行】Win7 下 qt5.x + opencv2.4.x编译环境的搭建

不想编译的同学，该链接有编译好的可在Qt中运行的OpenCV运行库

http://download.csdn.net/download/u011171235/9790738
Qt中使用Opencv，通过Mingw编译
Opencv：2.4.10 Qt：5.7 Mingw：530_32 CMAke：3.7.2

First：准备
到官网下载qt-opensource-windows-x86-mingw482_opengl-5.3.1.exe文件，执行该文件，选择默认安装即可实现QT的安装（安装在C盘的根目录下），该文件封装好了Qt libraries、Qt Creator，其中Qt Creator为3.1.2版本。

到官网http://OpenCV.org/downloads.html下载OpenCV for Windows2.4.9版本——opencv-2.4.9.exe。执行该文件，把它解压到适当的目录下即可，我是把它放到了c盘的根目录下，即c:\opencv。

在http://www.cmake.org/cmake/resources/software.html下载cmake-3.0.1-win32-x86.exe文件。安装cmake，安装在C:\CMake目录下。

设置系统的环境变量，即把C:\Qt\Qt5.3.1\Tools\MinGW\bin加入系统的Path环境变量中，因为在CMake编译过程中会用到该目录下的库。

Second：开始
在桌面上点击CMake(cmake-gui)图标，执行CMake，在Where is the source code栏和Where to build thebinaries栏中分别C:/opencv/soureces为opencv和C:/opencv/MinGW。C:/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`C:/Qt/Qt5.3.1/Tools/mingw482_32/bin/gcc.exe`，在C++一栏中填写`C:/Qt/Qt5.3.1/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_VARCMake Error: Could not find cmake modulefile: C:/opencv/MinGW/CMakeFiles/3.0.1/CMakeCXXCompiler.cmakeCMake Error: Error required internal CMakevariable not set, cmake may be not be built correctly.Missing variable is:CMAKE_C_COMPILER_ENV_VARCMake Error: Could not find cmake modulefile: C:/opencv/MinGW/CMakeFiles/3.0.1/CMakeCCompiler.cmakeConfiguring incomplete, errors occurred!

找到Name为CMAKE_MAKE_PROGRAM的一项，把它的Value填写为
C:/Qt/Qt5.3.1/Tools/mingw482_32/bin/mingw32-make.exe

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，选中它下面的
WITH_QT和WITH_OPENGL，
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.xCall 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：C:/Qt/Qt5.3.1/5.3/mingw482_32/bin/qmake.exe找到QT_MKSPECS_DIR，它的值填写为：C:/Qt/Qt5.3.1/5.3/mingw482_32/mkspecs找到QT_QTCORE_LIBRARY_DEBUG，它的值填写为：C:/Qt/Qt5.3.1/5.3/mingw482_32/bin/Qt5Cored.dll找到QT_QTCORE_LIBRARY_RELEASE，它的值填写为：C:/Qt/Qt5.3.1/5.3/mingw482_32/bin/Qt5Core.dll找到QT_QTCORE_INCLUDE_DIR，它的值填写为：C:/Qt/Qt5.3.1/5.3/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

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.xCall Stack (most recent call first): cmake/OpenCVFindLibsGUI.cmake:34 (find_package) CMakeLists.txt:466 (include) ```----------在Ungrouped Entries下找到Qt5Concurrent_DIRQt5Core_DIRQt5Gui_DIRQt5Test_DIRQt5Widgets_DIRQt5OpenGL_DIR它们的Value分别填写为：C:/Qt/Qt5.3.1/5.3/mingw482_32/lib/cmake/Qt5ConcurrentC:/Qt/Qt5.3.1/5.3/mingw482_32/lib/cmake/Qt5CoreC:/Qt/Qt5.3.1/5.3/mingw482_32/lib/cmake/Qt5GuiC:/Qt/Qt5.3.1/5.3/mingw482_32/lib/cmake/Qt5TestC:/Qt/Qt5.3.1/5.3/mingw482_32/lib/cmake/Qt5WidgetsC:/Qt/Qt5.3.1/5.3/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。
打开系统的命令终端

进入C:\opencv\MinGW目录
执行mingw32-make命令

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：

c:\Qt\Qt5.3.1\5.3\mingw482_32\bin;c:\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+=c:\opencv\build\include\opencv\c:\opencv\build\include\opencv2\       c:\opencv\build\includeLIBS+=c:\opencv\MinGW\lib\libopencv_calib3d249.dll.a\  c:\opencv\MinGW\lib\libopencv_contrib249.dll.a\  c:\opencv\MinGW\lib\libopencv_core249.dll.a\  c:\opencv\MinGW\lib\libopencv_features2d249.dll.a\  c:\opencv\MinGW\lib\libopencv_flann249.dll.a\  c:\opencv\MinGW\lib\libopencv_gpu249.dll.a\  c:\opencv\MinGW\lib\libopencv_highgui249.dll.a\  c:\opencv\MinGW\lib\libopencv_imgproc249.dll.a\  c:\opencv\MinGW\lib\libopencv_legacy249.dll.a\  c:\opencv\MinGW\lib\libopencv_ml249.dll.a\  c:\opencv\MinGW\lib\libopencv_objdetect249.dll.a\  c:\opencv\MinGW\lib\libopencv_video249.dll.a

运行下行人检测的代码，结果如图：