Image analysis – Applications
Reexamination Certificate
2005-04-26
2009-10-06
Couso, Yon (Department: 2624)
Image analysis
Applications
C382S306000, C358S003280
Reexamination Certificate
active
07599513
ABSTRACT:
A device which collects the pixel information generated during printing or scanning of a document, and transforms this sequential information into a code A which has a one-to-one relationship to the sequential pixel information, and which device computes from this code A a hashcode H which meets the requirements of a digital signature, and which device then feeds the digital information needed to print the hashcode H to the printer, in a pixel format, or feeds the same hashcode H to the digital media storage device, in both cases in a part of the document page which is digitally stored or printed, a method of use of the said device in encoding a document to form a hashcode H in pixel form.
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IBM, “Watermark data-hiding for print out by printer firmware”, Research Disclosure, vol. 427, No. 96, Nov. 1999.
Couso Yon
Gubo Adalbert
Husch Blackwell Sanders LLP
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