| Optimal interpolation [message #31856] |
Wed, 21 August 2002 06:47  |
Luis
Messages: 2
Registered: August 2002
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Junior Member |
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Hi,
does somebody know abouts an optimal interpolation subrroutine. I am trying
to compare some different interpolation techniques and this is the only one
than I don't have programmed.
thank you!
------------------------------------------------------------
Luis Prieto Godino
Dpto. F�sica de la Tierra II.
U.C.M. Spain
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| Re: Optimal interpolation [message #31959 is a reply to message #31856] |
Wed, 28 August 2002 13:47  |
Robert Stockwell
Messages: 74
Registered: October 2001
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Member |
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Paul van Delst wrote:
> GB Karas wrote:
>
>> sinc interpolation relies on the following interpolating kernel:
>>
>> sinc(x)=sin(x)/x
>
>
> Why don't you use FFT's to do the interpolation then? You know, FFT the curve in question, zerofill
> (or truncate) the result and FFT back?
If you check out a digital signal processing book on upsampling
or downsampling (or perhaps multirate sampling) you'll see that it
can be the way to go in some cases.
(oppenheimer and schafer frinstance)
Cheers,
bob
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| Re: Optimal interpolation [message #31961 is a reply to message #31856] |
Wed, 28 August 2002 11:19 |
Paul Van Delst[1]
Messages: 1157
Registered: April 2002
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Senior Member |
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GB Karas wrote:
>
> sinc interpolation relies on the following interpolating kernel:
>
> sinc(x)=sin(x)/x
Why don't you use FFT's to do the interpolation then? You know, FFT the curve in question, zerofill
(or truncate) the result and FFT back?
paulv
>
> Paul van Delst <paul.vandelst@noaa.gov> wrote in message news:<3D653F9D.223EDD66@noaa.gov>...
>> GB Karas wrote:
>>>
>>> oh well.. i think that really depends on your data
>>>
>>> i analyze MRI data, so I have to use sinc and windowed sinc
>>> interpolation
>>
>> OT, but...
>>
>> What is sinc (and windowed sinc) interpolation?
>>
>> paulv
--
Paul van Delst
CIMSS @ NOAA/NCEP/EMC
Ph: (301)763-8000 x7274
Fax:(301)763-8545
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