Re: [WM]: Digimarc watermarks

["Jeffrey Bloom" <jbloom@sarnoff.com>]

Tomek,

I recommend that you read some of Geoff Rhoads early patents.  They are 
easy reading and describe his ideas of using "rings" and "knots".  For 
example, read

@article{rhoads98,
   author =       "Geoffrey B. Rhoads",
   title =        "Image steganography system featuring perceptually
                   adaptive and globally scalable signal embedding",
   journal =  "United States Patent",
   year =         1998,
   volume =       "5,748,763"
}


At 12:08 PM 7/23/2001 +0200, you wrote:
>Hello!
>
>I'm new here so do not shot to me if this is wrong list :)
>
>Does anyone knows (except authors) how in theory works Digimarc watermark.
>
>I mean how they can read the watermark from rotated image or when the image
>has brightness changed, etc.?
>
>I've tried using LSB of each RGB but this is not good as Digimarc (in fact
>this is good
>when image is not changed in any way).
>
>Regards
>Tomek
>---

---
Dr. Jeffrey A Bloom, Internet & Multimedia Systems
Sarnoff Corporation, 201 Washington Road, CN 3500, Princeton, NJ 08543-5300

Email: jbloom@sarnoff.com
WWW: www.geocities.com/Jeffrey_Bloom
Phone: (609) 734-3287
Fax: (609) 734-2662


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