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Re: IDL Average Value Graphs [message #61411]

Tue, 15 July 2008 14:11

Jean H.
Messages: 472
Registered: July 2006

Senior Member

andybohn@gmail.com wrote:
> Hello, I was wondering if IDL has any built-in methods for two similar
> things.
> 1. Basically cut the image like a pizza (for a variable number of
> slices) and average the values in each slice to create a plot of
> average pixel value as a function of angle
> 2. Do the same thing, but plot the average pixel value as a function
> of radius, (concentric circles).
>
> I was going to write my own method, but it would be complicated
> converting angled lines or circles into pixels.
>
> Thanks a lot, Andy

have a look at POLYFILLV .... it will tell you which pixels are within a
polygon.

Then, download a function to create "pies" ... I have my own
http://www.ucalgary.ca/~jghasban/pie.pro ... but there is such function
in most downloadable libraries.

So, basically, you would create the pies, get the coordinates of the
pixels within and then do your maths!

Jean

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[Message index]

		Re: IDL Average Value Graphs By: Jean H. on Tue, 15 July 2008 14:11
		Re: IDL Average Value Graphs By: David Fanning on Tue, 15 July 2008 14:01
		Re: IDL Average Value Graphs By: andybohn on Thu, 17 July 2008 08:21
		Re: IDL Average Value Graphs By: Jean H. on Thu, 17 July 2008 10:19

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