Method of copying transparent originals and photographic copier

Details Method of copying transparent originals and photographic copier Method of copying transparent originals and photographic copier

1997-10-06

1999-11-02

Metjahic, Safet

Photocopying

Projection printing and copying cameras

Identifying, composing, or selecting

355 27, 355 35, G03B 2752, G03B 2732, G03B 2772

Patent

active

059780665

ABSTRACT:
Film frames are scanned preparatory to copying and a set of density values is generated for each frame. When a frame exhibits excessive contrast, a mask is calculated using the respective set of density values. The calculated mask is formed on an LCD or LED matrix which is in register with the frame. An image of the masked frame is then projected onto copy paper by a zoom objective. The mask has a size which is a function of the magnification factor and/or the mask-to-frame distance.

REFERENCES:
patent: 4239385 (1980-12-01), Hujer
patent: 4650316 (1987-03-01), Matsumoto
patent: 5019858 (1991-05-01), Suzuki
patent: 5155524 (1992-10-01), Oberhardt et al.
patent: 5164765 (1992-11-01), Strobel et al.
patent: 5239341 (1993-08-01), Ishida et al.
patent: 5303000 (1994-04-01), Benker et al.
patent: 5412451 (1995-05-01), Suzuki
patent: 5638153 (1997-06-01), Zahn et al.
patent: 5721079 (1998-02-01), Goto
patent: 5850281 (1998-12-01), Benker

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