[vtkusers] Sharpen Filter

[Michael Knopke]

Thanks a lot Luis for that hint! 
After checking some books about filters it's kind of obvious to me now .

Just one more question to your approach: 
After removing the smoothed version from the original image I probably need
to add the result to the original image again (which enhances edges only),
at least this is what the books suggest or is there another way? If I don't
add it, I get only an edge image.

Regards,
Michael

 

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