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Re: How can one improve the derivative? [message #86689 is a reply to message #86688]

Thu, 28 November 2013 06:48

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

g.nacarts@gmail.com writes:

> You mean the smooth function right? I used the smooth function with the keyword /Edge_Truncate as shown in your example but the results I got are not satisfactory. I was trying to perform image filtering with the Convol function but I didn't understand how to choose the kernel.

No, I meant try a low-pass filter using frequency filtering with the FFT
function to filter out the high-frequency noise components.

Cheers,

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

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[Message index]

		How can one improve the derivative? By: g.nacarts on Wed, 27 November 2013 04:25
		Re: How can one improve the derivative? By: David Fanning on Wed, 27 November 2013 05:26
		Re: How can one improve the derivative? By: wlandsman on Wed, 27 November 2013 06:46
		Re: How can one improve the derivative? By: lecacheux.alain on Wed, 27 November 2013 06:50
		Re: How can one improve the derivative? By: g.nacarts on Thu, 28 November 2013 04:28
		Re: How can one improve the derivative? By: lecacheux.alain on Thu, 28 November 2013 05:06
		Re: How can one improve the derivative? By: g.nacarts on Thu, 28 November 2013 05:27
		Re: How can one improve the derivative? By: David Fanning on Thu, 28 November 2013 05:35
		Re: How can one improve the derivative? By: g.nacarts on Thu, 28 November 2013 06:22
		Re: How can one improve the derivative? By: David Fanning on Thu, 28 November 2013 06:27
		Re: How can one improve the derivative? By: g.nacarts on Thu, 28 November 2013 06:42
		Re: How can one improve the derivative? By: David Fanning on Thu, 28 November 2013 06:48
		Re: How can one improve the derivative? By: g.nacarts on Thu, 28 November 2013 07:08
		Re: How can one improve the derivative? By: David Fanning on Thu, 28 November 2013 07:12
		Re: How can one improve the derivative? By: lecacheux.alain on Thu, 28 November 2013 08:53

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