Documents and apparatus to encode documents
First Claim
1. Apparatus comprising:
- an authenticator which obtains first information corresponding to a document to be constructed into an analog form, the first information also being obtainable from a first portion of the analog form; and
an incorporator which steganographically incorporates the first information in a portion of a digital representation of the document, the first information also being obtainable from a second portion of the analog form, the first information being obtainable with visible light scanning of the second portion of the analog form, the second portion corresponding to the portion of the digital representation.
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Accused Products
Abstract
The present invention relates generally to documents, e.g., such as legal tender, currency and identification documents, and apparatus for encoding documents. One claim recites: a physical document including a machine-detectable hidden signal. Presence of the hidden signal is determined by collecting visible light image data associated with the document and transforming the image data to a complementary domain to generate transform data. Presence of a telltale pattern in the transform data indicates a presence of the hidden signal. The hidden signal is associated with a type or status of the physical document. One type is legal tender. Another type is an identification document. An example of status is “do not copy”. Of course, other combinations are claimed as well.
143 Citations
14 Claims
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1. Apparatus comprising:
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an authenticator which obtains first information corresponding to a document to be constructed into an analog form, the first information also being obtainable from a first portion of the analog form; and an incorporator which steganographically incorporates the first information in a portion of a digital representation of the document, the first information also being obtainable from a second portion of the analog form, the first information being obtainable with visible light scanning of the second portion of the analog form, the second portion corresponding to the portion of the digital representation. - View Dependent Claims (2, 3, 4)
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- 5. A physical document comprising a machine-detectable signal, the signal being detectable by collecting visible light image data associated with the document and transforming the image data to a complementary domain to generate transform data based on a Fourier transform, wherein presence of a telltale pattern in the transform data indicates a presence of the signal, the signal or pattern corresponding to an action.
- 10. A physical document comprising a machine-detectable hidden signal, where presence of the hidden signal is determined by collecting visible light image data associated with the document and transforming the image data to a complementary domain to generate transform data, where presence of a telltale pattern in the transform data indicates a presence of the hidden signal, the hidden signal is associated with a type or status of the physical document.
Specification