1
Geoffrey B Rhoads: Linking of computers based on optical sensing of digital data. Digimarc Corporation, William Y Conwell, Digimarc Corporation, October 30, 2001: US06311214 (715 worldwide citation)

A printed object, such as an item of postal mail, a book, printed advertising, a business card, product packaging, etc., is steganographically encoded with plural-bit data. When such an object is presented to an optical sensor, the plural-bit data is decoded and used to establish a link to an intern ...


2
Tony F Rodriguez, Geoffrey B Rhoads, Bruce L Davis, J Scott Carr: Watermarked business cards and methods. Digimarc Corporation, William Y Conwell, Digimarc Corporation, November 18, 2003: US06650761 (366 worldwide citation)

A person's business card is steganographically encoded with plural-bit data. When presented to a computer system with an optical sensor, the plural-bit data is decoded and used to trigger various functionality. For example, the system can link to a remote data store containing updated contact i ...


3
Geoffrey B Rhoads: Digital watermarks and methods for security documents. Digimarc Corporation, William Y Conwell, Digimarc Corporation, February 5, 2002: US06345104 (305 worldwide citation)

Security documents (e.g. passports, currency, event tickets, and the like) are encoded to convey machine-readable multi-bit binary information (e.g., a digital watermark), usually in a manner not alerting human viewers that such information is present. The documents can be provided with overt or sub ...


4
Geoffrey B Rhoads: Linking of computers based on steganographically embedded digital data. Digimarc Corporation, William Y Conwell, Digimarc Corporation, April 1, 2003: US06542927 (300 worldwide citation)

A printed object, such as an item of postal mail, a book, printed advertising, a business card, product packaging, etc., is steganographically encoded with plural-bit data. When such an object is presented to an optical sensor, the plural-bit data is decoded and used to establish a link to an intern ...


5
Geoffrey B Rhoads: Security documents with hidden digital data. Digimarc Corporation, William Y Conwell, Digimarc Corporation, January 29, 2002: US06343138 (239 worldwide citation)

An identification code signal is hidden in a carrier signal (such as an electronic data signal or a physical medium) in a manner that permits the identification signal later to be discerned. The carrier signal can thereby be identified, or some machine responsive action can thereby be taken. The tec ...


6
Geoffrey B Rhoads, Ammon E Gustafson: Digital watermarking employing both frail and robust watermarks. Digimarc Corporation, William Y Conwell, Digimarc Corporation, June 3, 2003: US06574350 (229 worldwide citation)

Image, video, or audio data is encoded with both a frail and a robust watermark. The two watermarks respond differently to different forms of processing (e.g., copying the object may render the frail watermark unreadable), permitting an original object to be distinguished from a processed object. Ap ...


7
Geoffrey B Rhoads, Ammon E Gustafson: Methods and systems using multiple watermarks. Digimarc Corporation, William Y Conwell, Digimarc Corporation, October 21, 2003: US06636615 (207 worldwide citation)

Two or more digital watermarks, with different characteristics, are embedded in a document. The characteristics are chosen so that the watermarks will be affected in different manners if the document is subsequently copied or reproduced. The detection process or mechanism reads two or more of the wa ...


8
Geoffrey B Rhoads: Methods and devices for recognizing banknotes and responding accordingly. Digimarc Corporation, William Y Conwell, Digimarc Corporation, July 30, 2002: US06427020 (198 worldwide citation)

Line art on a banknote or other security document is slightly changed to effect the encoding of plural-bit digital data (i.e. the banknote is digitally watermarked). When such a banknote is thereafter scanned, the resulting image data can be recognized as corresponding to a banknote by detection of ...


9
Geoffrey B Rhoads: Method and system for encoding image and audio content. Digimarc Corporation, William Y Conwell, Digimarc Corporation, June 11, 2002: US06404898 (190 worldwide citation)

Image or audio content data is encoded to steganographically convey plural bit auxiliary data. The content data is thereafter subjected to lossy compression/decompression, and the auxiliary data can still be recovered and used, e.g., to control associated audio or video equipment.


10
Geoffrey B Rhoads: Steganographically encoding a first image in accordance with a second image. Digimarc Corporation, William Y Conwell, Digimarc Corporation, August 6, 2002: US06430302 (177 worldwide citation)

Multi-bit auxiliary information is hidden in imagery (e.g., digital photographs, video), using steganographic techniques. Such information can be used for various purposes, including identifying imagery as originating from a particular source, copy control, etc. In some embodiments, one image is enc ...