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Geoffrey B Rhoads: Decoding steganographic messages embedded in media signals. Digimarc Corporation, January 20, 2004: US06681029 (237 worldwide citation)

A decoder process reads a message steganographically encoded in a composite signal. One decoding process operates on a potentially modified version of the composite signal. The message is comprised of one or more symbols, each being associated with predetermined signal characteristics. The decoding ...


32
Geoffrey B Rhoads: Identification/authentication system using robust, distributed coding. Digimarc Corporation, Klarquist Sparkman Campbell Leigh & Whinston, April 28, 1998: US05745604 (234 worldwide citation)

An identification code signal is impressed on a carrier to be identified (such as an electronic data signal or a physical medium) in a manner that permits the identification signal later to be statistically discerned and the carrier thereby identified. The method and apparatus are characterized by r ...


33
Geoffrey Rhoads: Computer system linked by using information in data objects. Digimarc Corporation, Joel R Meyer, Digimarc Corporation, April 22, 2003: US06553129 (230 worldwide citation)

Various improvements to steganographic systems, and applications therefore, are disclosed. The improvements include facilitating scale and rotation registration for steganographic decoding by use of rotationally symmetric steganographically embedded patterns and subliminal digital graticules; improv ...


34
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 ...


35
Geoffrey B Rhoads: Audio steganography. Digimarc Corporation, Joel R Meyer, December 11, 2001: US06330335 (228 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 ...


36
Geoffrey B Rhoads, Bruce L Davis, J Scott Carr: Reconfiguring a watermark detector. Digimarc Corporation, Joel R Meyer, Digimarc Corporation, February 18, 2003: US06522769 (226 worldwide citation)

The invention relates to methods, devices and systems for reconfiguring a watermark detector. In many applications, it is useful to be able to change the operation of a watermark detector. Such changes may include changing how the watermark detector decodes or interprets a watermark embedded in a si ...


37
Robert D Powell, Mark J Nitzberg: Method for encoding auxiliary data within a source signal. Digimarc Corporation, Klarquist Sparkman Campbell Leigh & Whinston, September 15, 1998: US05809160 (222 worldwide citation)

A method and system for embedding signatures within visual images in both digital representation and print or film. A signature is inseparably embedded within the visible image, the signature persisting through image transforms that include resizing as well as conversion to print or film and back to ...


38
Daniel O Ramos, Brian T MacIntosh, Geoffrey B Rhoads: Smart images and image bookmarking for an internet browser. Digimarc Corporation, Elmer Galbi, July 16, 2002: US06421070 (220 worldwide citation)

Web pages which contain images are displayed by a browser. A special visual indicia is placed on any the images which contain a digital watermark so that a user can know that the image contains hidden watermark data. By clicking on the indicia which is placed on the image, the user will be linked to ...


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Geoffrey B Rhoads: Method and system for managing, accessing and paying for the use of copyrighted electronic media. Digimarc Corporation, Digimarc Corporation, April 25, 2006: US07035427 (217 worldwide citation)

The present invention provides a method for identifying copyrighted content on a network to help ensure legal uses of the copyrighted content. The method includes searching a network for steganographically embedded content based on predetermined information; comparing data extracted from located con ...


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Geoffrey B Rhoads: Audio or video steganography. Digimarc Corporation, Joel R Meyer, July 24, 2001: US06266430 (215 worldwide citation)

An input content signal—representing audio or video—is encoded to hide plural-bit auxiliary data therein. The process generates an intermediate signal that is a function of (a) the plural-bit auxiliary data, and (b) data related to human perception attributes of the content signal. This intermediate ...