[WM]: What is spatial frequency

["Parthipan Siva" <parthi@canada.com>]

<20020819040945.18642.h001.c009.wm@mail.canada.com.criticalpath.net>
X-Rcpt-To: <watermarking@watermarkingworld.org>
Sender: watermarking-owner@watermarkingworld.org
Precedence: bulk

Hi all,

What is spatial frequency in cycles per degree?  

I am trying to find an algorithm for comparing the
original image with the watermarked image.  Most papers
I read accounts for the HVS using this spatial
frequency.  I am unfamiliar with this term.

Can someone tell me how from an N x N gray scale image
I can get the spatial frequency in cycles per degree.

Thank you,

Parthipan Siva


______________________________________________________________________________

Watermarking Mailing List - http://www.watermarkingworld.org/ml.html
To unsubscribe send email to "majordomo@watermarkingworld.org" with
"unsubscribe watermarking YOURMAIL" in the body.
______________________________________________________________________________