[lug] Off-topic: Contour line in image problem

[John Hernandez]

I wonder if some remote sensing / GIS / satellite imagery software 
could help you accomplish this.  Imagine.  ArcView.  GRASS.  Maybe?

Glenn Murray wrote:

> This is off-topic, but I know there are a lot of people in the
> graphics and scientific communities who follow this list and may find
> this problem interesting.
> 
> I have a scientific computing problem and I suspect there is software
> out there that does what I am trying to do.  More or less I have to
> draw a contour line in an image and find its length.
> 
> More specifically, I have black and white jpeg images of a flame, in
> profile, in a tube.  I need to know the area of the flame front.  To
> find this I (am thinking I) need to draw a line along some (constant)
> intensity around the edge of the flame; a line dividing light from
> dark, as it were, from the top of the image to the bottom.  Then I
> need to know the line's length (from that I could calculate an
> estimate of the area).
> 
> Ideally the computer would draw this line or I could with a mouse, and
> I could mark start and end points.  The line may not reach to the tube
> edge, so I may need to extrapolate it.
> 
> Do you know of any software to do this sort of thing?  I may end up
> writing it myself.  Any help would be greatly appreciated.
> 
> Glenn Murray
> www.mines.edu/~gmurray/public_html/Welcome.html
> 
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