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Re: pixelwise regression for time series images [message #70895 is a reply to message #70894]

Thu, 13 May 2010 02:57

Bringfried Stecklum is currently offline

Bringfried Stecklum
Messages: 75
Registered: January 1996

Member

blofton wrote:
> I’ve written a program that uses LINFIT to calculate a linear model to
> each pixel in a multitemporal, registered series of images. That is,
> I fit a line in the time (z-) dimension at each x,y pixel location.
> However, I am using nested loops to do this and it takes a while to
> run. For larger images (1024X1024) there is no hope. I am wondering
> if you’ve come across a better (IDL-esque) method of doing this; I’ve
> not seen anything online.
>
> Thanks for any suggestions,
>
> brad
One can do that without loops. Just write down the regression equations, keeping
in mind that the summation has to be done for the 3rd dimension. Actually this
is what I like about IDL, you can think of bigger entities than just a single
value. I attached a function which works for me.

Regards,
Bringfried

Attachment: lincfit.pro
(Size: 1.34KB, Downloaded 125 times)

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[Message index]

		Re: pixelwise regression for time series images By: David Fanning on Thu, 13 May 2010 09:14
		Re: pixelwise regression for time series images By: Craig Markwardt on Thu, 13 May 2010 08:51
		Re: pixelwise regression for time series images By: David Fanning on Thu, 13 May 2010 07:48
		Re: pixelwise regression for time series images By: David Fanning on Thu, 13 May 2010 05:28
		Re: pixelwise regression for time series images By: Bringfried Stecklum on Thu, 13 May 2010 02:57

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