Method and image forming apparatus, and printing system for recording invisible information recording
First Claim
Patent Images
1. An invisible information recording method comprising:
- recording a digital image on a blank on a sheet of paper; and
recording information in the form of pixels so sized as to be invisible to a naked eye and at a print density invisible to the naked eye.
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Abstract
Invisible information are recorded in the form of pixels invisible to the naked eye and at a print density invisible to the naked eye.
50 Citations
17 Claims
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1. An invisible information recording method comprising:
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recording a digital image on a blank on a sheet of paper; and
recording information in the form of pixels so sized as to be invisible to a naked eye and at a print density invisible to the naked eye. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17)
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15. A printing system including an archiving printer which prints a document upon receipt of a request of printing the document, and at the same time stores the document as document data into an archive, and upon receipt of a request of reprinting the document stored, reprints the document by using the document data stored in the archive, the archiving printer comprising:
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a recording section for recording archive management information on storage locations of documents in the archiving printer in to a part of a document when the document is printed, in a state that the information is invisible to the human eye or needs a careful watching to see the information;
a reading section for reading out the information being recorded in the printed document in a state that the information is invisible to the human eye or needs a careful watching to see the information, by reproducing the document printed by the archiving printer by means of reproducing means; and
a knowing section for knowing the archive management information of the printed document from the read out information.
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Specification