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Re: Following a ridgeline [message #60884 is a reply to message #60874]

Tue, 17 June 2008 10:14

Jean H.
Messages: 472
Registered: July 2006

Senior Member

Jelle wrote:
>
> How about finding the maximum pixelvalue in the image, and then
> looking at the slope to a 4 pixel (or 6; 9) mean value for all the
> points at a specific distance (e.g., 30 pixels) away? Select the
> location with the lowest slope (Or maximum mean) and continue from
> there.
> Jelle

Hum... an edge is not necessarily the lowest slope...

What about edge detection filters? ... the Canny edge detector seems to
be fairly good (I haven't used it myself though)
http://en.wikipedia.org/wiki/Canny_edge_detector
http://www.isprs.org/istanbul2004/comm3/papers/376.pdf fig 6A

Jean

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[Message index]

		Re: Following a ridgeline By: Jelle on Wed, 18 June 2008 11:10
		Re: Following a ridgeline By: Jelle on Wed, 18 June 2008 11:02
		Re: Following a ridgeline By: Juggernaut on Wed, 18 June 2008 09:14
		Re: Following a ridgeline By: Jean H. on Wed, 18 June 2008 08:55
		Re: Following a ridgeline By: Jelle on Wed, 18 June 2008 01:52
		Re: Following a ridgeline By: Jean H. on Tue, 17 June 2008 10:14
		Re: Following a ridgeline By: RJA on Tue, 17 June 2008 02:20
		Re: Following a ridgeline By: Peter Clinch on Tue, 17 June 2008 02:01
		Re: Following a ridgeline By: Jelle on Mon, 16 June 2008 16:14
		Re: Following a ridgeline By: Kenneth P. Bowman on Mon, 16 June 2008 12:37
		Re: Following a ridgeline By: mzagursk@gmail.com on Mon, 16 June 2008 13:34
		Re: Following a ridgeline By: karo03de on Mon, 23 June 2008 00:50
		Re: Following a ridgeline By: mzagursk@gmail.com on Mon, 16 June 2008 13:15
		Re: Following a ridgeline By: David Fanning on Mon, 16 June 2008 12:49
		Re: Following a ridgeline By: Mike[2] on Tue, 24 June 2008 08:53

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