Digital invisible ink
AssigneeXerox Corporation
InventorEdward N. Chapman
Life of this patent
Estimating the term…
Abstract
Methods, systems and security devices for rendering digital invisible ink, can involve representing an invisible item in a single color that is not discernable from white by a human eye, embedding the invisible item into white space of a digital document, and converting the invisible item into a visible item using a transform table that defines how to convert the single color of the invisible item so that the invisible item after a conversion to the visible item is discernable by the human eye.
Claims20
A method for rendering digital invisible ink, comprising:
- representing an invisible item in a single color that is not discernable from white by a human eye;
- embedding the invisible item into white space of a digital document;
- converting the invisible item into a visible item using a transform table that defines how to convert the single color of the invisible item so that the invisible item after a conversion to the visible item is discernable by the human eye.
A system for rendering digital invisible ink, comprising:
- at least one processor and a memory, the memory storing instructions to cause the at least one processor to perform:
- representing an invisible item in a single color that is not discernable from white by a human eye;
- embedding the invisible item into white space of a digital document;
- converting the invisible item into a visible item using a transform table that defines how to convert the single color of the invisible item so that the invisible item after a conversion to the visible item is discernable by the human eye.
A security apparatus for rendering digital invisible ink, comprising:
- an invisible item represented in a single color that is not discernable from white by a human eye;
- the invisible item embedded into white space of a digital document;
- and
- the invisible item covered into a visible item with a transform table that defines how to convert the single color of the invisible item so that the invisible item after a conversion to the visible item is discernable by the human eye.
Dependencies are inferred from the claim text.