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Apply the Kuwahara filter to produce a painterly, oil-painting-style result. Unlike Gaussian blur, Kuwahara smooths within the most uniform quadrant of each neighborhood — preserving edges and yielding that classic painted-abstraction look.
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Kuwahara is a non-linear smoothing filter that averages pixels within the most uniform quadrant of a local neighborhood. It blurs smooth regions while preserving edges, producing a painterly effect.
Gaussian blur smooths edges; Kuwahara preserves them. That's why Kuwahara produces the distinctive oil-painting look instead of a defocused appearance.
The generalized version divides the neighborhood into N overlapping sectors (8 or 16) instead of just 4 quadrants, producing smoother, more natural output.