Method of camouflaging defective print elements in a printer

Details Method of camouflaging defective print elements in a printer Method of camouflaging defective print elements in a printer

2007-09-04

2007-09-04

Tran, Huan (Department: 2861)

Incremental printing of symbolic information

Thermal marking apparatus or processes

C347S019000

Reexamination Certificate

active

10996451

ABSTRACT:
A method of camouflaging defective print elements in a printer having a printhead with print elements, and each pixel of the image is assigned to a print element, and image information of a pixel that is assigned to a defective print element shifts to a nearby pixel position capable of printing with a non-defective print element. Shifting the image information includes the steps of a) encoding the image information to be printed as a multi-level pixel matrix in which one of a predetermined set of pixel values (“0”, “1”, “2”) is assigned to each pixel and at least one of the pixel values is a conditional pixel value (“1”) encoding a print instruction that depends upon whether or not a neighbouring pixel corresponds to a defective print element, b) determining defective print elements of the printer, and c) executing the print instruction.

REFERENCES:
patent: 6215557 (2001-04-01), Owens
patent: 6508531 (2003-01-01), Gargir
patent: 2002/0089566 (2002-07-01), Lopez et al.
patent: 1060896 (2000-12-01), None
patent: 1384592 (2004-01-01), None
patent: 0999516 (2004-05-01), None
patent: WO-97/31781 (1997-09-01), None

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