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Re: Following a ridgeline [message #60892 is a reply to message #60891]

Mon, 16 June 2008 16:14

Jelle
Messages: 19
Registered: May 2008

Junior Member

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. That should give you a reasonable indication of the path that
the ridge follows? Once you have the crude outline you can improve by
searching within the interpixel path in a region of a few pixels wide
for the best path to follow?

You will need to allow for some maximum curvature in the slope (e.g.
90 deg lef / right) from the direction of the last two consecutive
points to allow curving of the ridge, without backtracking. Also:
Going uphill after N steps should be allowed, to allow for undulating
ridgelines. But again: only within the curvature parameters?

Jelle

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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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