Pre-Processing > Non-Local Means
Reduces image noise using an advanced filtering algorithm . Each pixel’‘s local window is compared to windows around it. The windows’‘ center pixels are averaged together with weights depending on the variations between the windows.
1. Window Size
Size of neighborhood (in pixels) which is considered about each pixel for the filter (Recommended: 2-6)
Factor which controls the strength of the filter (Recommended: 0.2-0.6)
 J. Darbon, A. Cunha, T. Chan, S. Osher, and G. Jensen, “Fast nonlocal filtering applied to electron cryomicroscopy,” in IEEE International Symposium on Biomedical Imaging, 2008, pp. 1331–1334.
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