| Re: digitize a curve from an image [message #21422 is a reply to message #21178] |
Tue, 22 August 2000 00:00  |
Kristian Kjaer
Messages: 58
Registered: June 1998
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Member |
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Thanks for your replies.
One problem I had was that in all the programs the screen resolution was
a limiting factor; my scanned images had many more pixels than would fit
on the screen.
I thought of hacking something in IDL with
tvscl,image
while ... do cursor,x,y ; click to get the coord frame
while ... do cursor,x,y ; click to get the curve
polywarp, ... ; to get the coord. transformation (as
suggested).
but then I realized that again the screen resolution would limit the
result. Apparently, what I'd need is a rowing zoom window for exploring
the image.
In the end I decided to settle for screen resolution.
- Kristian
-------------
Kristian Kjær, Physics Dept., Risø Natl. Laboratory, Denmark
Kristian Kjær wrote:
>
> I have a gif file (B/W only, no greys or colours) showing a line graph.
> Now I would like to get hold of the x,y arrays represented by the curve.
> Has anyone written something to do that already?
> The coordinate axes are a little skewed in the image (originally
> scanned).
>
> Thanks for any help, Kristian
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