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I think Guy is talking about correctly upsampling to make the image more usable without the pixel edges. I've never done this but I imagine you would pad the fft of the image and  then inverse fft... You may have to Window the fft to stop edge effects propagating tho'.

Guy please correct me if I'm on the wrong track...

Mark


On 27/10/2011, at 2:16 PM, Martin Wessendorf wrote:

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> 
> Hey, Guy--
> 
> On 10/26/2011 11:41 PM, Guy Cox wrote:
> 
>> As to Jim's point about digital images, this brings me to another of my
>> 'hobby horses'.  We should NOT just look at our images as collected, we
>> should map them into a larger space using sine-wave fitting.  Only then
>> does Nyquist mean anything.
> 
> Can you go into how this is be done, or suggest a reference?
> 
> Thanks!
> 
> Martin
> -- 
> Martin Wessendorf, Ph.D.                   office: (612) 626-0145
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