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Converting Between cv::Mat and QImage or QPixmap

posted by Andy Maloney

In a previous article, I outlined how to compile OpenCV for Mac OS X and to build and run a small example. In that post I used OpenCV‘s High-Level GUI (highgui) module to display a simple interface using the Qt framework. This is great if you’re writing a one-off program or are just experimenting with OpenCV, but how do you interface with your own Qt-based project if you don’t want to (or can’t) use the highgui module?

OpenCV Library

OpenCV Library

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Qt Library

Qt Library

The first hurdle is converting between data formats so you can work with images in both OpenCV and Qt. So how do you move an image’s data between a cv::Mat and a QImage or QPixmap so you can display it in a widget?

In this article, I present some functions to handle these conversions and explain how to use them.

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