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Re: Histogram looks like spiky bars [message #53110 is a reply to message #53063]

Tue, 20 March 2007 12:27

MarioIncandenza
Messages: 231
Registered: February 2005

Senior Member

On Mar 16, 8:14 am, "rpert...@gmail.com" <rpert...@gmail.com> wrote:
> Hi,
> I have an image for which I want to make a histogram. I just do plot,
> histogram(image) with xrange being my 14 bit image size (~16000).
> ANyway, what I get is a bunch of vertical lines of different lengths.
> I want a smooth curve, not discrete lines.
> How do i do that?
> thanks!!

There are two routines out there called HIST_PLOT. One is from Liam
Gumley and can be found at http://www.cis.rit.edu/~dwmpci/HTML_DOC/plotting_help.html
(also see his extensive bag o' tricks at http://cimss.ssec.wisc.edu/~gumley/).
The other is from Gelu Nita and can be found here:
http://achilles.nascom.nasa.gov/~zarro/php/ssw_print.php?fil e=$SSW/radio/ovsa/idl/util/hist_plot.pro.

I use the Gumley routine, though over the years I have modified it
almost into unrecognizability. But if you're just getting into this
problem, try them both see which you like better, both are very simple
routines.

Good luck!

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[Message index]

		Histogram looks like spiky bars By: rpertaub@gmail.com on Fri, 16 March 2007 08:14
		Re: Histogram looks like spiky bars By: MarioIncandenza on Tue, 20 March 2007 12:27
		Re: Histogram looks like spiky bars By: Sven Geier on Mon, 19 March 2007 22:35

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