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Re: 2D Savitzky-Golay derivative filter? [message #83163 is a reply to message #83094]

Fri, 08 February 2013 16:39

dg86
Messages: 118
Registered: September 2012

Senior Member

Dear Klemen,

Thanks for the helpful post.

I actually need to compute derivatives, specifically the gradients of experimentally measured holograms. Roberts and Sobel are not appropriate for my application because they compute the magnitude of the gradient, rather than the gradient itself. As an example, I've uploaded a typical noisy hologram of a colloidal sphere together with the x-component of its gradient computed with finite differences, and the equivalent component computed with the SG filter:

http://physics.nyu.edu/grierlab/noisygradient.png

For what it's worth, the SG version is more useful for my subsequent analysis.

All the best,

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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