Electrographic copying machine

Details Electrographic copying machine Electrographic copying machine

1994-11-28

1997-06-24

Lee, Thomas D.

Facsimile and static presentation processing

Facsimile

358497, 2502012, 355 55, 396125, H04N 100

Patent

active

056422016

ABSTRACT:
An electrographic copying machine in which an image projected on an original glass stand by a film projector is read out by a scanner and copied is provided with a color scanner including a CCD for reading out a projected image, a smoothing processing unit for averaging the tone data of pixels outputted from the color scanner every four pixels, a difference value totaling unit for totaling the difference values between the averaged tone data, and a control unit for performing focusing of the film projector so that the total of the difference values is maximum. The focusing of the projected image is automatically performed.

REFERENCES:
patent: 4788426 (1988-11-01), Kuehnle
patent: 4843413 (1989-06-01), Walther

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