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2D Savitzky-Golay derivative filter? [message #83094]

Sun, 03 February 2013 10:55

dg86
Messages: 118
Registered: September 2012

Senior Member

Dear Folks,

I would like to use Savitzky-Golay filters to calculate gradients of images.
Before I roll my own code to calculate the filter coefficients, I was wondering
if anyone here already had working routines that they would be willing to share.

IDL's built-in SAVGOL routine only computes one-dimensional filters, and I need
two-dimensional filters. Erik Rosolowsky's SAVGOL2D computes two-dimensional
smoothing filters, but not two-dimensional derivative filters.

Alternatively, is there an equivalently good IDL way to compute image gradients?
A useful replacement would offer the noise rejection of Savitzky-Golay without
suppressing peaks the way that SMOOTH() does.

Many thanks,

David

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[Message index]

		2D Savitzky-Golay derivative filter? By: dg86 on Sun, 03 February 2013 10:55
		Re: 2D Savitzky-Golay derivative filter? By: d.poreh on Wed, 06 February 2013 23:33
		Re: 2D Savitzky-Golay derivative filter? By: Klemen on Thu, 07 February 2013 05:52
		Re: 2D Savitzky-Golay derivative filter? By: dg86 on Fri, 08 February 2013 16:39

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