Method and apparatus for copying transparencies to light-sensiti

Details Method and apparatus for copying transparencies to light-sensiti Method and apparatus for copying transparencies to light-sensiti

1998-09-30

2000-09-12

Mathews, Alan A.

Photocopying

Projection printing and copying cameras

355 35, 355 40, G03B 2700, G03B 2772, G03B 2752

Patent

active

061185132

ABSTRACT:
The invention relates to a method and an apparatus for copying transparencies to a light-sensitive material, the apparatus including an illuminator for illuminating the original, wherein the illuminator has a plurality of individually addressable pixels which can be switched to light or dark and which are controlled according to a raster image. The density values of the original are first determined with a predetermined spatial and gray-scale resolution and the raster image is subsequently generated from the density values of the original according to the error diffusion method.

REFERENCES:
patent: 4239385 (1980-12-01), Hujer
patent: 4350996 (1982-09-01), Rosenfeld
patent: 5543935 (1996-08-01), Harrington
patent: 5602943 (1997-02-01), Velho et al.
patent: 5638153 (1997-06-01), Zahn et al.
patent: 5798821 (1998-08-01), Zahn et al.
patent: 5978066 (1999-11-01), Treiber et al.

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