06614914 is referenced by 701 patents and cites 40 patents.

A watermark system includes an embedder, detector, and reader. The watermark embedder encodes a watermark signal in a host signal to create a combined signal. The detector looks for the watermark signal in a potentially corrupted version of the combined signal, and computes its orientation. Finally, a reader extracts a message in the watermark signal from the combined signal using the orientation to approximate the original state of the combined signal. While adapted for images, video and audio, the watermark system applies to other electronic and physical media. For example, it can be applied to mark graphical models, blank paper, film and other substrates, texturing objects for ID purposes, etc.

Title
Watermark embedder and reader
Application Number
9/503881
Publication Number
6614914 (B1)
Application Date
February 14, 2000
Publication Date
September 2, 2003
Inventor
Ammon E Gustafson
Beaverton
OR, US
Geoffrey B Rhoads
West Linn
OR, US
Agent
Digimarc Corporation
US
Agent
Joel R Meyer
US
Assignee
Digimarc Corporation
OR, US
IPC
H04K 1/00
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