Simple, but complete example showing how to display QImage might look like this: #include <QtGui/QApplication> #include <QLabel> int main(int argc, char *argv[]) { QApplication a(argc, argv); QImage myImage; myImage.load(“test.png”); QLabel myLabel; myLabel.setPixmap(QPixmap::fromImage(myImage)); myLabel.show(); return a.exec(); }
Use this to convert cvImage to Qimage, here cvImage is the original image. height, width, channel = cvImg.shape bytesPerLine = 3 * width qImg = QImage(cvImg.data, width, height, bytesPerLine, QImage.Format_RGB888) and set this Qimage to Label.setPixmap parameter from Qimage. It works!!!
After hours of stumbling around with the same issue, I’d like to share the solution that worked for me on windows vista: using python2.6 copy the following directory into your dist directory generated by py2exe: C:\Python26\Lib\site-packages\PyQt4\plugins\imageformats I just dropped the imageformats directory directly into my dist directory, without any further modifications to qt.conf or anything … Read more
Code looks fine with one exception. Memory management. cv::Mat doesn’t work like QImage in this mater. Remember that QImage is using copy on write mechanism and shares memory for each copy. cv::Mat also shares memory but it doesn’t do copy on write (I’m also new with open cv (2 weeks) so I can’t explain yet … Read more
As you have noticed opencv reads the image in BGR format but QImage in RGB, in your first method you convert to QImage without doing the conversion and then you use rgbSwapped() method to do the conversion. By testing the first method I get: 1000 loops, best of 5: 291 usec per loop In the … Read more
Michal Kottman’s answer is valid and give expected result for some images but it’ll fail on some cases. Here is a solution i found to that problem. QImage imgIn= QImage((uchar*) img.data, img.cols, img.rows, img.step, QImage::Format_RGB888); Difference is adding img.step part. qt won’t complain without it but some images won’t show properly without it. Hope this … Read more