Setting up OpenCV in Qt Creator Ubuntu 12.04
Solution 1
I have also been trying to set up OpenCV for Qt Creator for a few days now. I would recommend you trying the procedure found at
https://code.google.com/p/qt-opencv-multithreaded/wiki/Documentation
It is simple to follow, and it just WORKS. When you get to section 1.3, run any code sample you got at hand. I used:
int main( int argc, char** argv )
{
if( argc != 2)
{
cout <<" Usage: display_image ImageToLoadAndDisplay" << endl;
return -1;
}
Mat image;
image = imread(argv[1], CV_LOAD_IMAGE_COLOR); // Read the file
image = imread("lena.png", CV_LOAD_IMAGE_COLOR); // Read the file
if(! image.data ) // Check for invalid input
{
cout << "Could not open or find the image" << std::endl ;
return -1;
}
namedWindow( "Display window", CV_WINDOW_AUTOSIZE );// Create a window for display.
imshow( "Display window", image ); // Show our image inside it.
waitKey(0); // Wait for a keystroke in the window
return 0;
}
Hope that helps!
Solution 2
It worked for me:
INCLUDEPATH += /usr/local/include/opencv2
LIBS += -L/usr/local/lib
LIBS += -lopencv_core
LIBS += -lopencv_imgproc
LIBS += -lopencv_highgui
LIBS += -lopencv_ml
LIBS += -lopencv_video
LIBS += -lopencv_features2d
LIBS += -lopencv_calib3d
LIBS += -lopencv_objdetect
LIBS += -lopencv_contrib
LIBS += -lopencv_legacy
LIBS += -lopencv_flann
LIBS += -lopencv_nonfree
vasan
Updated on April 11, 2020Comments
-
vasan about 4 years
I'm trying to set up OpenCV in Qt Creator and I have some problems. I added the OpenCV path in the Qt Creator .pro file
INCLUDEPATH += /usr/local/include/opencv LIBS += -L/usr/local/lib \ -lopencv_core \ -lopencv_imgproc \ -lopencv_highgui \ -lopencv_ml \ -lopencv_video \ -lopencv_features2d \ -lopencv_calib3d \ -lopencv_objdetect \ -lopencv_contrib \ -lopencv_legacy \ -lopencv_flann
And I want to read and show image in this code
void MainWindow::on_pushButton_clicked() { cv::Mat matInput = cv::imread("LP.jpg"); if( matInput.empty()) { std::cout<<"Can't load image "<<std::endl; } cv::namedWindow("Show"); cv::imshow("Show", matInput); cv::waitKey(); }
When I run my project it shows the following message:
Starting /home/vasan/Qt/build-OpenCVWithQt-Desktop-Debug/OpenCVWithQt...
The program has unexpectedly finished.
/home/vasan/Qt/build-OpenCVWithQt-Desktop-Debug/OpenCVWithQt exited with code 0