3 identifier: movit.sharpen
4 title: Deconvolution Sharpen (GLSL)
7 creator: Steinar H. Gunderson
13 Deconvolution Sharpen is a filter that sharpens by way of deconvolution
14 (i.e., trying to reverse the blur kernel, as opposed to just boosting high
15 frequencies), more specifically by FIR Wiener filters. It is the same
16 algorithm as used by the (now largely abandoned) Refocus plug-in for GIMP,
17 and I suspect the same as in Photoshop's “Smart Sharpen” filter.
18 The effect gives generally better results than unsharp masking, but can be very
19 GPU intensive, and requires a fair bit of tweaking to get good results without
20 ringing and/or excessive noise. It should be mentioned that for the larger
23 - identifier: matrix_size
30 - identifier: circle_radius
36 - identifier: gaussian_radius
37 title: Gaussian Radius
42 - identifier: correlation