| Re: digitize a curve from an image [message #21414 is a reply to message #21178] |
Wed, 23 August 2000 00:00   |
Martin Schultz
Messages: 515
Registered: August 1997
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Senior Member |
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Kristian Kjaer wrote:
>
> 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 Kj�r, Physics Dept., Ris� Natl. Laboratory, Denmark
>
> Kristian Kj�r 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
Two possible solutions (aside from a request for the digital
data):
1. get a bigger monitor
2. scan the image in a lower resolution so it fits onto your
screen (or use photoshop or the likes to resample the image into
a lower resolution)
Martin
--
[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[ [[[[[[[
[[ Dr. Martin Schultz Max-Planck-Institut fuer Meteorologie
[[
[[ Bundesstr. 55, 20146 Hamburg
[[
[[ phone: +49 40 41173-308
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[[ fax: +49 40 41173-298
[[
[[ martin.schultz@dkrz.de
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