Film image reading system

Details Film image reading system Film image reading system

1996-05-23

2000-04-04

Coles, Edward L.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358487, 358500, 358517, 358518, 358520, 358261, H04M 140

Patent

active

060468270

ABSTRACT:
A film image reading system includes: a number of photoelectric conversion elements for converting a light image of a film image to an analog image signal indicative of a magnitude corresponding to a light amount; an exposure controller for controlling exposure time of the conversion elements; a converter for converting the analog image signal to a digital image signal; a signal correcting device for correcting the digital image signal to a proper output image signal in accordance with a reference relationship between digital image signal and output image signal, the reference relationship having a first range for variables of digital image signal and a second range for variables of output image signal; and a range changing device for changing the first range of the reference relationship in accordance with a controlled exposure time.

REFERENCES:
patent: 4825065 (1989-04-01), Imai
patent: 5060061 (1991-10-01), Shishido et al.
patent: 5132788 (1992-07-01), Hirota
patent: 5138443 (1992-08-01), Ikeda et al.
patent: 5181105 (1993-01-01), Udagawa et al.
patent: 5181127 (1993-01-01), Ogino et al.
patent: 5329383 (1994-07-01), Collette
patent: 5387929 (1995-02-01), Collier

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