window Under the use of opencv And opencv support QT
software environment
Qt-5.9.3（mingw530）
MinGW-5.1.0-32bit（ Downloaded QT There are ）
CMake-3.11.3
OpenCV-2.4.9
1 compile opencv WITH_QT
Download it from the official website and compile it opencv, I won't support it QT
So you need to compile it yourself
2 Downloaded OpenCV The folder will have ：
build （ Compiled Library , use MSVC The words of , Directly in ）
sources （ Source code ）
QT Using MinGW edition , So you need to compile it yourself ,
MinGW Version of opencv（ support QT） Compilation process
（1）CMake Self installation
（2）MinGW It can be used directly qt Inside
open cmake-gui, Set source code and generation path ：
Where is the source code: E:/OpenCV_2.4.9/opencv/sources
Where to build the binaries:
E:/OpenCV_2.4.9/opencv-build（ Any name , Don't mix with what you already have build Just overlap ）
click Configure, Set up compiler
Specify the generator for this project: MinGW Makefiles
Specify native compilers
Next
Compilers C: E:\Qt\Qt5.9.3\Tools\mingw530_32\bin\gcc.exe
Compilers C++: E:\Qt\Qt5.9.3\Tools\mingw530_32\bin\g++.exe
Finish
A series of red colors appear ,
Check WITH_QT
Check WITH_OPENGL
Do not check WITH_IPP
Click again Configure, The following setting options appear
set up QT_MAKE_EXECUTABLE by E:\Qt\Qt5.9.3\5.9.3\mingw53_32\bin\qmake.exe
set up Qt5Concurrent_DIR by E:\Qt\Qt5.9.3\5.9.3\mingw53_32\lib\cmake\Qt5Concurrent
set up Qt5Core_DIR by E:\Qt\Qt5.9.3\5.9.3\mingw53_32\lib\cmake\Qt5Core
set up Qt5Gui_DIR by E:\Qt\Qt5.9.3\5.9.3\mingw53_32\lib\cmake\Qt5Gui 0
set up Qt5Test_DIR by E:\Qt\Qt5.9.3\5.9.3\mingw53_32\lib\cmake\Qt5Test
set up Qt5Widgets_DIR by E:\Qt\Qt5.9.3\5.9.3\mingw53_32\lib\cmake\Qt5Widgets
set up Qt5OpenGL_DIR by E:\Qt\Qt5.9.3\5.9.3\mingw53_32\lib\cmake\Qt5OpenGL
click Generate generate Makefile
** compile OpenCV**
Go to the directory you set up before （E:/OpenCV_2.4.9/opencv-build）
Direct operation E:\Qt\Qt5.9.3\Tools\mingw530_32\bin\mingw32-make
( Best setting E:\Qt\Qt5.9.3\Tools\mingw530_32\bin Is the system variable )
If there is a problem with the compilation , Baidu , I did it all at once
Compile and install
function mingw32-make install
It's best to do it
G:\paper\opencv249\build\install\x64\mingw\bin Lower generation *249.dll
G:\paper\opencv249\build\install\x64\mingw\lib Lower generation *249.dll.a
G:\paper\opencv249\build\install\x64\mingw\bin Set to the system variable
3 QT Use the compiled opencv
.po Set in file
INCLUDEPATH += G:\paper\opencv249\build\install\include
INCLUDEPATH += G:\paper\opencv249\build\install\include\opencv
INCLUDEPATH += G:\paper\opencv249\build\install\include\opencv2
LIBS +=G:\paper\opencv249\build\install\x64\mingw\lib\libopencv_core249.dll.a\
G:\paper\opencv249\build\install\x64\mingw\lib\libopencv_calib3d249.dll.a\
G:\paper\opencv249\build\install\x64\mingw\lib\libopencv_contrib249.dll.a\
G:\paper\opencv249\build\install\x64\mingw\lib\libopencv_core249.dll.a\
G:\paper\opencv249\build\install\x64\mingw\lib\libopencv_features2d249.dll.a\
G:\paper\opencv249\build\install\x64\mingw\lib\libopencv_flann249.dll.a\
G:\paper\opencv249\build\install\x64\mingw\lib\libopencv_gpu249.dll.a\
G:\paper\opencv249\build\install\x64\mingw\lib\libopencv_highgui249.dll.a\
G:\paper\opencv249\build\install\x64\mingw\lib\libopencv_imgproc249.dll.a\
G:\paper\opencv249\build\install\x64\mingw\lib\libopencv_legacy249.dll.a\
G:\paper\opencv249\build\install\x64\mingw\lib\libopencv_ml249.dll.a\
G:\paper\opencv249\build\install\x64\mingw\lib\libopencv_objdetect249.dll.a\
G:\paper\opencv249\build\install\x64\mingw\lib\libopencv_video249.dll.a\
G:\paper\opencv249\build\install\x64\mingw\lib\libopencv_ocl249.dll.a
main file ：
#include "opencv2/opencv.hpp"
const std::string input_file_name = "input.png";
cv::Mat image = imread(input_file_name);
If it appears
G:\01miwork\qtpro2\bandTest\main.cpp:11: error: undefined reference to
`cv::imread(std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> > const&,
.po Set in file
DEFINES += _GLIBCXX_USE_CXX11_ABI=0
Remember to rebuild
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