How Can I Reliably Convert a cv::Mat to a QImage?

Converting OpenCV cv::Mat to QImage

The OpenCV cv::Mat and Qt QImage are two commonly used data structures for storing and manipulating images. Converting between these formats is a common task, and there are several methods to achieve this.

Michal Kottman's Solution

One solution, as referenced in the question, is provided by Michal Kottman. This method involves the direct assignment of cv::Mat data to QImage:

QImage imgIn= QImage((uchar*) img.data, img.cols, img.rows, img.step1(), QImage::Format_RGB888);

Addressing Limitations

However, in some instances, this approach may not yield the expected results for certain images. To address this, an improved solution is proposed:

QImage imgIn= QImage((uchar*) img.data, img.cols, img.rows, img.step, QImage::Format_RGB888);

Key Difference

The crucial difference in this solution is the inclusion of img.step in the function call. While Qt may not raise an error without this parameter, its absence can lead to improper display of certain images.

Conclusion

By incorporating img.step, this solution provides a more robust method for converting cv::Mat to QImage, ensuring consistent and accurate image representation in all cases.

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