Ir (infrared) mark destroyed on copy
AssigneeXerox Corporation
InventorEdward N. Chapman
Life of this patent
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Abstract
A security apparatus, method and system for rendering a security mark, can involve providing a security mark with a metameric pair of infrared inks. A spectral reflectance of two metameric inks among the metameric pair of inks differs for CMYK for K in infrared. A first metameric ink among the metameric pair of infrared inks can be configured to include more K than a second metameric ink among the metameric pair of infrared inks, wherein when a document containing the security mark is scanned, and the number of K pixels in the first metameric ink is filtered to destroy the security mark when viewed through an infrared camera.
Claims20
A method for rendering a security mark, comprising:
- providing a security mark with a metameric pair of infrared inks, wherein a spectral reflectance of the two metameric inks among the metameric pair of inks differs for CMYK for K in infrared;
- and
- configuring a first metameric ink among the metameric pair of infrared inks to comprise more K than a second metameric ink among the metameric pair of infrared inks, wherein when a document containing the security mark is scanned, a number of K pixels in the first metameric ink are filtered to destroy the security mark when viewed through an infrared camera.
A security apparatus, comprising:
- a security mark with a metameric pair of infrared inks, wherein a spectral reflectance of the two metameric inks among the metameric pair of inks differs for CMYK for K in infrared;
- and
- a first metameric ink configured among the metameric pair of infrared inks to comprise more K than a second metameric ink among the metameric pair of infrared inks, wherein when a document containing the security mark is scanned, a number of K pixels in the first metameric ink are filtered to destroy the security mark when viewed through an infrared camera.
A system for rendering a security mark, comprising:
- at least one processor and a memory, the memory storing instructions to cause the at least one processor to perform:
- providing a security mark with a metameric pair of infrared inks, wherein a spectral reflectance of the two metameric inks among the metameric pair of inks differs for CMYK for K in infrared;
- and
- configuring a first metameric ink among the metameric pair of infrared inks to comprise more K than a second metameric ink among the metameric pair of infrared inks, wherein when a document containing the security mark is scanned, a number of K pixels in the first metameric ink are filtered to destroy the security mark when viewed through an infrared camera.
Dependencies are inferred from the claim text.