Printing plate registration using a camera

Details Printing plate registration using a camera Printing plate registration using a camera

2007-03-29

2010-12-21

Yan, Ren (Department: 2854)

Printing

Planographic

Lithographic plate making, and processes of making or using...

C101S477000, C250S208100, C250S559300

Reexamination Certificate

active

07854199

ABSTRACT:
A method and apparatus for determining the alignment of printing plate (14) mounted on an imaging drum (12), and applying an image to a printing plate while maintaining registration and alignment between the image and a reference edge (15) of the printing plate include mounting the printing plate on a plate-making machine (10) and then determining the locations of at least two points on the reference edge. The locations of two or more points are used to determine a transformation that is applied to image data to yield transformed image data (27). The transformed image data is used to image the printing plate. A method and apparatus for determining the locations of the points using backlighting avoids errors encountered in illuminating from the top.

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