Displaying opencv Mat image into QGraphicsView

Asked Oct 15 '17 at 11:57

Active Oct 15 '17 at 11:57

Viewed 1,572 times

I use these lines of codes to display the Mat image in a graphicsView in Qt:

scene = new QGraphicsScene(this);
ui->graphicsView->setScene(scene);
scene->addPixmap(QPixmap::fromImage(QImage(image.data,image.cols, image.rows, QImage::Format_RGB888)));

But the image is displayed with a blue mask over it. And the Mat image is shown correctly, when I try to display it with this code:

imshow("image", image);

I don't understand where is the bug.

asked Oct 15 '17 at 11:57

Soroor

3

OpenCV uses BGR color format, not RGB as your code seems to assume. Maybe this is the cause? – mikkola Oct 15 '17 at 12:01
Exactly BGR vs RGB issue. Just call "cvtColor(image, image, COLOR_BGR2RGB);" before creating the QImage – Miki Oct 15 '17 at 14:36
https://stackoverflow.com/a/17137998/1387438 – Marek R Oct 15 '17 at 16:03
I already did the transformation with cvtColor, but the result remains the same. – Soroor Oct 15 '17 at 19:14
@MarekR: That solved my problem. Thanks. – Soroor Oct 15 '17 at 19:36

Displaying opencv Mat image into QGraphicsView

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