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Re: rejecting a few pixel values from an array of pixel values [message #70078 is a reply to message #70077]

Sat, 13 March 2010 07:40

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

sid writes:

> I am having an image array with 1024*1024 pixel values with pixel
> values ranging from 1.39 to 0.03. Now I need only pixel values ranging
> from 1.1 to 0.8, so please do suggest me what method to follow to get
> only the pixel values of my interest, also suggest if any looping can
> be done for this kind of job.

I take it you are new to IDL. :-)

Here is a suggestion. Don't write loops in IDL. You
can find the image values you want like this:

indices = Where(image GE 0.8 AND image LE 1.1, count)
IF count GT 0 THEN valuesOfInterest = image[indices]

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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		Re: rejecting a few pixel values from an array of pixel values By: Robert Moss, PhD on Sat, 13 March 2010 07:55
		Re: rejecting a few pixel values from an array of pixel values By: David Fanning on Sat, 13 March 2010 07:40

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