Geoffrey B Rhoads

US Patent:

6343138, Jan 29, 2002

Filed:

Jun 29, 1999

Appl. No.:

09/342972

Inventors:

Geoffrey B. Rhoads - West Linn OR

Assignee:

Digimarc Corporation - Tualatin OR

International Classification:

H04K 100

US Classification:

382100, 382135, 283901

Abstract:

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 technique can be applied in video imagery embodiments to control associated video equipment, e. g. to serve as a copy control signal.

US Patent:

6344640, Feb 5, 2002

Filed:

May 25, 2000

Appl. No.:

09/578872

Inventors:

Geoffrey B. Rhoads - West Linn OR 97068

International Classification:

G01J 120

US Classification:

2502019, 2502081

Abstract:

An imaging system for measuring the field variance of distorted light waves collects a set of short exposure âdistortedâ images of an object, and applies a field variant data processing methodology in the digital domain, resulting in an image estimate which approaches the diffraction limited resolution of the underlying physical imaging system as if the distorting mechanism were not present. By explicitly quantifying and compensating for the field variance of the distorting media, arbitrarily wide fields can be imaged, well beyond the prior art limits imposed by isoplanatism. The preferred embodiment comprehensively eliminates the blurring effects of the atmosphere for ground based telescopes, removing a serious limitation that has plagued the use of telescopes since the time of Newton.

US Patent:

6345104, Feb 5, 2002

Filed:

Jul 31, 1998

Appl. No.:

09/127502

Inventors:

Geoffrey B. Rhoads - West Linn OR

Assignee:

Digimarc Corporation - Tualatin OR

International Classification:

H04K 100

US Classification:

382100, 283 74

Abstract:

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 subliminal calibration patterns. When a document incorporating such a pattern is scanned (e. g. by a photocopier), the pattern facilitates detection of the encoded information notwithstanding possible scaling or rotation of the scan data. The calibration pattern can serve as a carrier for the watermark information, or the watermark can be encoded independently. In one embodiment, the watermark and the calibration pattern are formed on the document by an intaglio process, with or without ink. A photocopier responsive to such markings can take predetermined action if reproduction of a security document is attempted. A passport processing station responsive to such markings can use the decoded binary data to access a database having information concerning the passport holder.

US Patent:

6353672, Mar 5, 2002

Filed:

Mar 8, 2000

Appl. No.:

09/520926

Inventors:

Geoffrey B. Rhoads - West Linn OR

Assignee:

Digimarc Corporation - Tualatin OR

International Classification:

H04K 100

US Classification:

382100, 380252

Abstract:

An input content signalârepresenting audio or videoâis steganographically encoded to hide plural-bit auxiliary data therein. The encoding operation changes over time, e. g. , by using different âkeyâ data for successive portions of the content signal. In some embodiments, the key data used in one portion of the signal is a function of auxiliary data decoded from a preceding portion. Consequently, to successfully decode the auxiliary data, the decoder must have successfully decoded a previous portion. In essence, decoding instructions are sent âon the flyâ in such embodiments. In some embodiments, the auxiliary data is changed in temporally adjoining portions of the content signalâe. g. , in successive frames of video or blocks of audio. In other embodiments, the key is changed less frequently, e. g.

US Patent:

6363159, Mar 26, 2002

Filed:

Nov 17, 1999

Appl. No.:

09/441821

Inventors:

Geoffrey B. Rhoads - West Linn OR

Assignee:

Digimarc Corporation - Tualatin OR

International Classification:

H04K 100

US Classification:

382100, 380252

Abstract:

A consumer audio device decodes auxiliary control data that is hidden in audio information. The auxiliary control information can be used to trigger some response in the device, such as enabling or disabling certain operations.

US Patent:

6373043, Apr 16, 2002

Filed:

Feb 13, 2001

Appl. No.:

09/783756

Inventors:

Geoffrey B. Rhoads - West Linn OR 97068

International Classification:

H01L 2700

US Classification:

2502081, 2502034, 35613901

Abstract:

An imaging instrument includes plural spaced-apart photon collectors, whose sampled outputs are correlated in pairs to yield brightness line integrals across a remote object being imaged. These integrals can be subject to matrix decomposition to yield a 2D array of image data corresponding to the object. Another imaging instrument includes plural spaced-apart reflectors, each having an optical fiber end at its focal point. The precise positions of the optical fiber ends are controlled by a control system (e. g. , including piezo-electric positioners) that can be operated to counter-act the effect of atmospheric turbulence. The other ends of the fibers terminate at an image plane and serve to provide an output image.

US Patent:

6381341, Apr 30, 2002

Filed:

Nov 17, 1999

Appl. No.:

09/441820

Inventors:

Geoffrey B. Rhoads - West Linn OR

Assignee:

Digimarc Corporation - Tualatin OR

International Classification:

G06K 900

US Classification:

382100

Abstract:

Source materials to be watermarked already have variations in their characteristics that may tend to aid the watermark encoding. Where such favorable variations exist, relatively less watermark energy can be applied.

US Patent:

6385329, May 7, 2002

Filed:

Jul 19, 2000

Appl. No.:

09/618948

Inventors:

Ravi K. Sharma - Hillsboro OR
Adnan M. Alattar - Tigard OR
Farid Ahmed - Beaverton OR
Geoffrey B. Rhoads - West Linn OR

Assignee:

Digimarc Corporation - Tualatin OR

International Classification:

H04K 100

US Classification:

382100

Abstract:

A wavelet domain watermark encoder and decoder embed and detect auxiliary signals in a media signal, such as a still image, video or audio signal. A watermark orientation signal is embedded in a wavelet decomposed signal to facilitate detection of the watermark in a geometrically distorted version of the embedded signal.