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Thanks, that's pretty useful. Next time I'm doing image analysis I'll have try applying a sigmoid transformation in fourier space. Never realized it was this st

Thanks, that's pretty useful. Next time I'm doing image analysis I'll have try applying a sigmoid transformation in fourier space. Never realized it was this straightforward! BTW, perhaps it'd be handy to list prior art if it's really a redundant patent.

dnautics 11y ago
You don't have to use arctan, either. Probably logistic sigmoid will do just fine, too. I think there's also a low frequency bandpass in this particular implementation. If you think about what that means in Fourier space, why you get the results shown makes a whole lot of sense.