Linking OpenCV in QtCreator and Utilizing the Qt Library
In QtCreator, linking OpenCV and integrating the Qt library can be a multifaceted task. This article provides a comprehensive guide to help you navigate the process successfully.
Installation of OpenCV for QtCreator
Prerequisites:
- Ensure Visual Studio 2010 Professional is installed.
- Download and install Qt 5.0.1 for Windows 32-bit (MinGW 4.7). Install in a directory without white-spaces in its name.
- Download and install cmake-2.8.10.2-win32-x86.exe for all users.
- Extract OpenCV-2.4.0.exe to C:Programsopencv24. This will create "opencv" and "opencv_bin" folders.
Steps:
- Set the PATH environment variable to include the MinGW compiler path.
-
Start cmake-gui.exe and configure the following:
- Source code: Set to OpenCV's default directory (C:Programsopencv24opencv).
- Binaries: Set to the opencv_bin directory (C:Programsopencv24opencv_bin).
- Additional options: Omit WITH_TBB, WITH_IPP, WITH_CUDA, and select WITH_QT.
- Click "Generate" and exit cmake-gui.exe.
- Open a terminal, navigate to the opencv_bin directory, and run mingw32-make and then mingw32-make install.
- Add the QtCreator/bin path to the PATH variable.
Qt Project Setup
- Create a new console application in QtCreator.
-
In the .pro file:
- Include OpenCV headers: INCLUDEPATH = C:/Programs/opencv24/opencv_bin2/install/include.
- Link to OpenCV libraries: LIBS = "C:/Programs/opencv24/opencv_bin2/bin/*.dll".
-
In the main source file:
- Include necessary OpenCV headers.
- Use OpenCV functions to process an image.
Example .pro File:
QT += core QT -= gui TARGET = cvHello CONFIG += console CONFIG -= app_bundle TEMPLATE = app INCLUDEPATH += C:/Programs/opencv24/opencv_bin2/install/include LIBS += "C:/Programs/opencv24/opencv_bin2/bin/*.dll" SOURCES += main.cpp OTHER_FILES += \ img.JPG
Example Main File:
#include "opencv2/core/core.hpp" #include "opencv2/highgui/highgui.hpp" using namespace cv; int main() { Mat mat = imread("img.JPG"); namedWindow("hello"); imshow("hello", mat); waitKey(0); return 0; }
By following these steps, you can successfully link OpenCV in QtCreator and harness the functionality of both libraries in your applications.
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