https://bugs.kde.org/show_bug.cgi?id=426175

--- Comment #78 from caulier.gil...@gmail.com ---
OpenCV provide a solution to disable 3D aceleration by API call:

https://answers.opencv.org/question/123097/how-to-stop-using-gpu-in-opencv-32/?comment=123114

So typically, for each thread using OpenCV API, we need to call
cv::ocl::setUseOpenCL(false)

But it's problematic to use :

https://github.com/opencv/opencv/issues/8035

In all case, we must not use cv::Umat which is optimized for OpenCV and use
cv::Mat instead everywhere.

Gilles

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