The invention provides a method of forensic digital watermarking that randomly selects an
orientation and/or embedding protocol for a forensic digital watermark signal to be …

This application is a continuation of US application Ser. No. 10/469,474, filed Jun. 14, 2004
(Now US Pat. No. 7,454, 033), which is the national stage of PCT Application No …

A digital watermark is generated with radial and circumferential symmetries in a particular
domain of a host signal into which it is embedded. These symmetries enable a detector to …

Transform object watermarked object executable instructions stored therein; providing data
associ ated with a user to the data repository; receiving machine executable instructions …

The present invention provides data steganographically embedded in multiple channels.
The term “channel'in this application is generally used to refer to a mechanism, material or …

US. PATENT DOCUMENTS 6,424,249 B1 6/2002 Houvener 6,424,725 B1 7/2002 Rhoads
et a1. 5,237,164 A 8/1993 Takada 6,422,285 B1 8/2002 Rhoadsetal. 5,284,364 A 2/1994 …

US7152021B2 - Computing distortion of media signals embedded data with repetitive structure
and log-polar mapping - Google Patents US7152021B2 - Computing distortion of media signals …

An image processing apparatus includes an extracting unit to extract watermark data from
image data of an image; a gen erating unit to generate a watermark image based on the …

(57) ABSTRACT A method of Synchronizing a digital watermark detector divides a
watermarked Signal into blocks, each block includ ing a portion of a watermark signal. For …

Described herein is a watermarking technology for protecting digital signals, such as a
music clip. In another described implementation, a watermarking system employs a …