Embedded optical signatures in documents
AssigneeScientific Games International, Inc.
InventorsFred W. Finnerty, Gary R. Streeter, Kenneth E. Irwin, Jr.
Life of this patent
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Abstract
A method of embedding an optical signature in a document and document produced therefrom. The optical signature uses an invisible optical pattern or covering that can reflect light in non-visible wavelengths, such as light in infrared, or fluoresces when exposed to a particular wavelength of light, such as ultra-violet light. The invisible optical pattern can be a covering over another optical pattern, or a base pattern upon which a second optical pattern is embedded.
Claims7
A method of validating a document having an optical signature comprised of a predefined disuniform edge of the document, comprising the steps of:
- placing the edge of the document against a background;
- and
- determining if the edge is disuniform and comparing the detected disuniform edge to the known predefined optical signature of the document thereby indicating if the document is valid based on a match between the detected disuniform edge and the optical signature of the document.
Dependencies are inferred from the claim text.