[SOLVED] OpenCV processed image back to QImage doesn't work

[pmh4514]

I'm having trouble getting an OpenCV processed result rendered on a Widget. Basically I have a widget, I process its displayed pixels and then redisplay them.

I begin by grabbing a Widget's view:

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QPixmap view(myWidget->grab());
@

I then convert it to QImage
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QImage image = view.toImage();
@

I then setup an OpenCV matrix, one for the original, one for processed:

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Mat matOriginal(iH,iW,CV_8UC4,(uchar*)image.bits(),image.bytesPerLine());
Mat matProcessed = Mat::zeros( matOriginal.size(), matOriginal.type() );
@

I then run OpenCV's equalizeHist to perform a histogram equalization:

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cvtColor(matOriginal, matProcessed, CV_BGR2GRAY);
equalizeHist(matProcessed, matProcessed);
@

This much works perfectly, I can verify the equalized histogram by using OpenCV to pop it open in a new window:

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namedWindow("2", CV_WINDOW_AUTOSIZE);
imshow("2", matProcessed);
@

The new OpenCV window shows matProcessed, and clearly the histogram has been properly equalized.

Finally I want to convert that back to QImage, so that I can show it on the Qt widget:
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QImage imgFinal = QImage((uchar*) matProcessed.data, matProcessed.cols, matProcessed.rows, matProcessed.step, image.format());

QPainter paint(this);
paint.drawImage(0,0, imgFinal);

@

The problem is that what is rendered on the QWidget during paint(..) is the original image without the histogram equalization. I'm unsure why this is especially since the OpenCV window I opened with matProcessed shows the proper result.

Where have I gone wrong?

[pmh4514]

I found a solution.. my resulting transform to QImage was not actually creating an image. I used the accepted solution found here:

http://stackoverflow.com/questions/11543298/qt-opencv-displaying-images-on-qlabel

and now it works!