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Re: How can one improve the derivative? [message #86685 is a reply to message #86684]

Thu, 28 November 2013 05:35

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

g.nacarts@gmail.com writes:

> This is what I did, I was playing with different values for nL and nR. But I was wondering if there is any specific rule. Also, when I used order=1 to give me the first order derivative filter the answer was not converges at all.
> At order 0, the Savitzky-Golay filter seems to make the things better but not much.

There is a good example of high frequency filtering with the FFT
function in the Image Processing chapter of Coyote's Guide to
Traditional IDL Graphics.

I found three of these books in the back of the closet, in case you are
interested. These are the last three. I'm providing free shipping in the
US while they last.

http://www.idlcoyote.com/coyotestore/

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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