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Platform: Windows 10

OpenCV: 4.2.0

Qt Creator: 4.11.0

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#include <QCoreApplication>
#include <opencv2/opencv.hpp>
#include <opencv2/highgui/highgui.hpp>
using namespace cv;
 
int main(int argc, char *argv[])
{
     QCoreApplication a(argc, argv);
     Mat img = imread("C:/OpenCV/images/lena.jpg");
     namedWindow("image");
     imshow("image", img); //imshow("image", img);
     waitKey();
     return a.exec();
}

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INCLUDEPATH += C:\OpenCV\OpenCV4.2.0DNN\include
LIBS+= -LC:\OpenCV\OpenCV4.2.0DNN\lib \
-lopencv_world420

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References:

1. OpenCV-2.4.6 with QT5.1 console project

2. Installing Qt 5.14.1

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