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I am extracting smaller GpuMat from GpuMat. The smaller GpuMat cannot be used in any further operation since it produces errors because its step value is not right (step value is the same as in oldMat but column and line numbers are different). How can i make the new GpuMat continuous again?

GpuMat newMat = GpuMat( oldMat.clone(), Rect( x, y, w, h));

I was wondering if there is any way to achieve at least remotely similar results using ocl. I know its a long shot but still worth asking.
If there is no other way, I would apriciate any advice on how to implement it in OpenCL or use already writen OpenCL code.

I need to extract some atributes (number of connected regions, max/min region size, ...) from binary image.

The problem is I am limited to OCL functionalities only.

I would hate to go on OpenCL level so any idea would be greatly appreciated.