Apparatus and methods are provided. Print-mark data corresponding to a print mark (124) on a hardcopy of printed material (120) is extracted from data corresponding to the hardcopy of printed material (120). The print-mark data is analyzed to quantify printing artifacts of the print mark (124) resulting from printing variations occurring during printing of the hardcopy of printed material (120). The quantified printing artifacts are encrypted, and the encrypted printing artifacts are encoded into data corresponding to a machine-readable identifier (152). The machine-readable identifier (152) is printed from the data corresponding to the machine-readable identifier (152) on the hardcopy of printed material (120).
申请公布号
EP1513112(A2)
申请公布日期
2005.03.09
申请号
EP20040255368
申请日期
2004.09.03
申请人
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
发明人
SAMII, MOHAMMAD M.;VAN VEEN, MARK A.;WEBB, STEVEN L.;POON, LILY;TAYLOR, CLARK NOBLE