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A comment on Blur Tools for Signal. Parent comment
This might be narrowly true (it’s hard to recover precisely the original image), but is not really an accurate summary in this context, if the only goal of reversal here is to recognize the face. Deconvolution will quite effectively undo gaussian blur. https://en.wikipedia.org/wiki/Deconvolution https://en.wikipedia.org/wiki/Richardson–Lucy_deconvolution https://en.wikipedia.org/wiki/Blind_deconvolution
In Photoshop, the deconvolution tool is called “Smart Sharpen”, and has a preset for a gaussian PSF.
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This might be narrowly true (it’s hard to recover precisely the original image), but is not really an accurate summary in this context, if the only goal of reversal here is to recognize the face. Deconvolution will quite effectively undo gaussian blur. https://en.wikipedia.org/wiki/Deconvolution https://en.wikipedia.org/wiki/Richardson–Lucy_deconvolution https://en.wikipedia.org/wiki/Blind_deconvolution
In Photoshop, the deconvolution tool is called “Smart Sharpen”, and has a preset for a gaussian PSF.