How to Integrate OpenCV with Qt Creator and Utilize Qt Libraries?

Linking OpenCV to QtCreator and Utilizing Qt Libraries

Introduction

This tutorial aims to provide a comprehensive guide to linking OpenCV with QtCreator and successfully utilizing the Qt library.

Installation Prerequisites

• Qt 5.0.1 for Windows 32-bit (MinGW 4.7)
• OpenCV-2.4.0.exe
• cmake-2.8.10.2-win32-x86.exe

OpenCV Installation

1. Extract OpenCV-2.4.0.exe to C:Programsopencv24.
2. Create an additional folder C:Programsopencv24opencv_bin.
3. Set the PATH environment variable to include the MinGW compiler bin directory.

4. Run cmake-gui.exe and configure the following:

   • Source code: C:Programsopencv24opencv
   • Binaries: C:Programscopencv24opencv_bin
   • Specify native compilers: C:/Programs/Qt/Qt5.0.1/Tools/MinGW/bin/gcc.exe for C and C:/Programs/Qt/Qt5.0.1/Tools/MinGW/bin/g .exe for C
   • Ensure that WITH_QT is selected and WITH_TBB, WITH_IPP, and WITH_CUDA are unselected
   • Set CMAKE_BUILD_TYPE to "Debug"

Linking to QtCreator Project

1. Create a new QtCreator console application.

2. Add the following lines to the .pro file:

   • INCLUDEPATH = C:/Programs/opencv24/opencv_bin2/install/include
   • LIBS = "C:/Programs/opencv24/opencv_bin2/bin/*.dll"

3. In the main source file:

   • Include OpenCV headers:

     • #include "opencv2/core/core.hpp"
     • #include "opencv2/highgui/highgui.hpp"
     • #include "opencv/cv.h"

   • Add the necessary libraries:

     • `LIBS = -LC:Programsopencv24opencv_bin2bin
       libopencv_core240d
       libopencv_highgui240d
       libopencv_imgproc240d
       libopencv_features2d240d
       libopencv_calib3d240d`

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