On: Show HN: Resize images using the FFT

[eliteraspberrie]

Thanks. I'll add a window function and see if that helps.

[angersock → eliteraspberrie]

Try it with a checkerboard pattern--somewhat the pathological case.

Gray cats are somewhat smooth from a signal standpoint.

[eliteraspberrie → angersock]

Good idea. Here's the result: http://imgur.com/a/EHNH0

Edit: I'll be adding a window function soon to attenuate the ringing, it'll be interesting to see the difference that makes.

[dnautics → eliteraspberrie]

you can also try to apply a smoothening function: Usually multiplying by a gaussian in phase space will do, but this will cause your image to be blurred. What would be really impressive is if you could interpolate a pattern in the high frequency signal, and use it to "infer" values for your high frequency padding that "naturally cancel out" ringing to below the resolution of the imag.e

[angersock → eliteraspberrie]

A beautiful example of ringing. :)

[oakwhiz → eliteraspberrie]

I'm surprised that the ringing isn't that bad even without a window function.