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Re: Butterworth Band-Pass Filter [message #73917 is a reply to message #73915] Sat, 11 December 2010 20:37 Go to previous messageGo to previous message
David Fanning is currently offline  David Fanning
Messages: 11724
Registered: August 2001
Senior Member
burton449 writes:

> as mentionned in the topic, i want to do a Butterworth Band-Pass
> Filter on a 9166 X 4600 pixels image.
>
> The doc of butterworth.pro in the astrolib explain how to use the
> script for a lowpass filter, but not for a band-pass and a high-pass.
>
> Have any idea how to do?

You need to read my new book. In the meantime, you
can find an explanation here:

http://www.dfanning.com/ip_tips/freqfiltering.html

This describes a low-pass filter, but the equation for
the high-pass filter is there, too. Just replace the
low-pass filter with the high-pass version. :-)

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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