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Re: Surface fitting image with missing data [message #61804]

Thu, 31 July 2008 01:27

werner.hupfer
Messages: 1
Registered: July 2008

Junior Member

On 31 Jul., 02:12, jradavenp...@gmail.com wrote:
> Hey all;
>
> I have a 2-D array (essentially an image) with dimensions [n,m]
>
> There is a large chunk in a corner of the image with no data. All
> pixels have values greater than 1, except within this chunk, which =
> 0.
>
> SFIT fits these as valid points and tips my surface (a plane) towards
> this corner! I thought I would be terribly clever by doing the
> following:
>
> result = sfit( finite(image/(image gt 0)),1,/max_degree)
>
> alas, SFIT isnt playing ball and makes a whole array of /NaN...
>
> Thoughts? Is there a version of SFIT (or something similar) with a /
> NaN keyword? A more clever way to fit a simple surface to an image
> with missing data? Thanks folks
>
> - Jim

Hello Jim

I can highly recommend the library from Craig Markwardt. I use
mpfitfun for 2D fitting. Among one of the many useful features is the
ability to do curvefit on data points set to NaN!!!!

http://cow.physics.wisc.edu/~craigm/idl/idl.html

Cheers
Werner

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		Re: Surface fitting image with missing data By: werner.hupfer on Thu, 31 July 2008 01:27
		Re: Surface fitting image with missing data By: Craig Markwardt on Sun, 03 August 2008 21:52

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