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US 10,543,711 B2Granted
Authenticating identification and security documents and other objects
AssigneeDigimarc Corporation
InventorsTony F. Rodriguez, Geoffrey B. Rhoads, Ravi K. Sharma
Life of this patent
Estimating the term…
Abstract
The application discloses apparatus and systems for authenticating physical object, identification documents and security documents. Some such methods and apparatus involve signal encoding or digital watermarking.
Claims25
A method comprising:
- using an optical imager, scanning a printed object to obtain a digital image, in which the printed object comprises first spatial features comprising a pattern, the pattern comprising angle modulations, and in which the angle modulations are oriented on the printed object with respect to an angle of a structure provided on the printed object;
- detecting first spatial features in the digital image, said detecting yielding detected first spatial features;
- obtaining a geometric alignment between expected first spatial features and the detected first spatial features, said obtaining yielding an obtained geometric alignment;
- based on the obtained geometric alignment, examining a tamper-evident print signature at locations determined relative to the detected first spatial features to verify authenticity of the printed object.
1 more element
A method comprising:
- using an optical imager, scanning a printed object to obtain a digital image;
- detecting first spatial features in the digital image, said detecting yielding detected first spatial features;
- obtaining a geometric alignment between expected first spatial features and the detected first spatial features, said obtaining yielding an obtained geometric alignment;
- based on the obtained geometric alignment, examining a tamper-evident print signature at locations determined relative to the detected first spatial features to verify authenticity of the printed object, in which said examining comprises checking for an expected offset of a line structure of a first spatial feature relative to a base orientation provided by a second feature printed on the printed object, in which the first spatial feature is printed on a surface of the printed object, and the second feature is printed on the surface, and in which the second feature is not included in the tamper-evident print signature.
1 more element
Dependencies are inferred from the claim text.