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Re: 2D Savitzky-Golay derivative filter? [message #83197 is a reply to message #83102]

Thu, 07 February 2013 05:52

Klemen
Messages: 80
Registered: July 2009

Member

Dear David,

the solution I have over here works also over a larger domain. It doesn't compute the gradient but a sky-view factor. We use it for visualization of terrain to expose subtle terrain features, which is important for instance in archeology.
So just in case you are looking for a visual solution to find edges and you don't necessary need gradients, try the following link:

http://iaps.zrc-sazu.si/en/svf#v

We have there a SAV file you can download and test the data. I guess you aren't working with georeferenced data, so it might be that you need to set the vertical exaggeration factor to an appropriate value (try different values). You can find also a paper describing the theory behind the method. If you need the original code, contact me.

Cheers, Klemen

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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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