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OpenCV Hough on GPU is instable

It seems there is a problem with OpenCV Hough implementation on GPU. Application: apply gpu::Hough on a video: it counts 664 objects. Close Application. Restart the same application on the same video: it counts 691 objects. Close Application. Restart the same application on the same video: it counts 667 objects.

Using Opencv Hough on CPU the count is always 662 objects. How is it possible? Thank you

OpenCV Hough on GPU is instableunstable

It seems there is a problem with OpenCV Hough implementation on GPU. Application: apply gpu::Hough on a video: it counts 664 objects. Close Application. Restart the same application on the same video: it counts 691 objects. Close Application. Restart the same application on the same video: it counts 667 objects.

Using Opencv Hough on CPU the count is always 662 objects. How is it possible? Thank you