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这篇文章是我网上找的参考文章,下面黑色字体是原来的内容,红色字体和图片是我自己的内容。我自己的安装平台是:win7-64
引言
首先搞清楚我们要什么。我们要在QT上开发基于opencv的应用程序,需要opencv lib的支持,那在QT开发平台有两种方式,MSVC和MinGW,MSVC-lib可以在VisualStudio开发也可在QTCreator开发,MinGW-lib可以在QTCreator开发。
如果使用MSVC-lib,就直接安装上面的opencv-2.4.10.exe就可以得到。
如果要使用MinGW-lib就要用opencv源码重新编译。
这篇文章讲述的就是opencv源码如何编译出MinGW-lib。
一、 安装MinGW编译链
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。
我的:qt-opensource-windows-x86-mingw482_opengl-5.3.0.exe
下载地址:http://download.qt.io/archive/
你想装什么,哪个版本,随便下!
二、下载opencv源码
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。
我的:opencv-2.4.10.exe
下载地址:https://sourceforge.net/projects/opencvlibrary/files/
你想装哪个平台,哪个版本,随便下!
三、安装CMAKE
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。
四、用CMAKE编译opencv源码
1. 在桌面上点击CMake(cmake-gui)图标,执行CMake,
2. 在Where is the source code栏和Where to build the binaries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。
3. 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(对应自己的目录),在C++一栏中填写C:/Qt/Qt5.3.1/Tools/mingw482_32/bin/g++.exe(对应自己的目录),Fortran不填写。
4. 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C:/Qt/Qt5.3.1/Tools/mingw482_32/bin/mingw32-make.exe(对应自己的目录)即可。再次点击Configure,这时不会提示任何错误,表明配置成功。
5. 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:C:/Qt/Qt5.3.1/5.3/mingw482_32/bin/qmake.exe(对应自己的目录)
找到QT_MKSPECS_DIR,它的值填写为:C:/Qt/Qt5.3.1/5.3/mingw482_32/mkspecs(对应自己的目录)
找到QT_QTCORE_LIBRARY_DEBUG,它的值填写为:C:/Qt/Qt5.3.1/5.3/mingw482_32/bin/Qt5Cored.dll(对应自己的目录)
找到QT_QTCORE_LIBRARY_RELEASE,它的值填写为C:/Qt/Qt5.3.1/5.3/mingw482_32/bin/Qt5Core.dll(对应自己的目录)
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(对应自己的目录)
6. 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:
(对应自己的目录)
C:/Qt/Qt5.3.1/5.3/mingw482_32/lib/cmake/Qt5Concurrent
C:/Qt/Qt5.3.1/5.3/mingw482_32/lib/cmake/Qt5Core
C:/Qt/Qt5.3.1/5.3/mingw482_32/lib/cmake/Qt5Gui
C:/Qt/Qt5.3.1/5.3/mingw482_32/lib/cmake/Qt5Test
C:/Qt/Qt5.3.1/5.3/mingw482_32/lib/cmake/Qt5Widgets
C:/Qt/Qt5.3.1/5.3/mingw482_32/lib/cmake/Qt5OpenGL
7. 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。
8. 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,
9. 再执行mingw32-make install命令。这样可用于Qt的opencv库文件就生成了。
10. 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
11. 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\include
LIBS+=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
完成!