Digital watermarking by adding random, smooth patterns

Details Digital watermarking by adding random, smooth patterns Digital watermarking by adding random, smooth patterns

1997-12-08

2000-08-08

Swann, Tod B.

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

H04L 900

Patent

active

061016020

ABSTRACT:
A digital image is "watermarked", that is, authenticated by an embedded pattern. The pattern is created by hashing the image and adding a signature element. Manipulating this result by the seed for a random number generator leads to an initial two dimensional random black-and-white pattern. This pattern is manipulated by a cellular automaton and smoothed before being added to the original image. To determine whether the image is authentic, one retrieves the watermark by subtracting the watermarked image from the original to obtain the difference. The value of the correlation between the difference thus obtained and the smoothed pattern determines the presence or absence of the watermark.

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Ingemar J. Cox, Joe Kilian, Tom Leighton, & Talal Shamoon, "Secure Spread Spectrum Watermarking for Multimedia", NEC Research Institute Technical Rpt 95-10 (33 pages).

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