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Threshold value from histogram plot [message #34922]

Sun, 04 May 2003 14:12

biomedthesis2002
Messages: 12
Registered: November 2002

Junior Member

hi,
I have a set of images. I plot the histogram for each image and from
the image calculate the threshold value. I want to move a cursor in
that histogram plot and obtain the x-axis value at the cursor position
in that plot. And i want to try sliding on that curve and for each
value along x-axis i want to obtain a threshold value.

Can anybody please tell me how to do it???

Thanks for ur time in advance,
- Aks.

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Re: Threshold value from histogram plot [message #35018 is a reply to message #34922]

Sun, 04 May 2003 16:21

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

New2IDL (biomedthesis2002@yahoo.com) writes:

> I have a set of images. I plot the histogram for each image and from
> the image calculate the threshold value. I want to move a cursor in
> that histogram plot and obtain the x-axis value at the cursor position
> in that plot. And i want to try sliding on that curve and for each
> value along x-axis i want to obtain a threshold value.
>
> Can anybody please tell me how to do it???

I'd have a look at ZPLOT. Most of the techniques
you will want to use are illustrated there:

http://www.dfanning.com/programs/zplot.pro

You will probably also need GETCOLOR (ZPlot is an
*old* program), while you are there. It's in the same
place.

http://www.dfanning.com/programs/getcolor.pro

Cheers,

David

--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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