Film reading apparatus which reads an unexposed portion of a fil

Details Film reading apparatus which reads an unexposed portion of a fil Film reading apparatus which reads an unexposed portion of a fil

1986-03-20

1989-05-09

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 75, 358 76, 355 38, G03F 308, G03B 2780, H04N 146

Patent

active

048293717

ABSTRACT:
A color scanner for converting color data of a color original (e.g., a photographic film) into an electrical signal, includes a level comparator for discriminating the type of film (e.g., color negative vs. color positive, color vs. monochrome, type of color negative) in accordance with output signals, e.g., color component signals, from a sensor (i.e., based on a light transmittance of an unexposed portion of the film). The output from the level comparator is supplied to an accumulation time control block through a register, a selector, and the like. The accumulation time control block corrects the electrical signal based on the discrimination result from the level comparator irrespective of the type of film, so that an accumulation time of the sensor is changed by changing a bias voltage applied thereto.

REFERENCES:
patent: 4079388 (1978-03-01), Takahama et al.
patent: 4097892 (1978-06-01), Balding
patent: 4274732 (1981-06-01), Thurm et al.
patent: 4448521 (1984-05-01), Shiota
patent: 4577961 (1986-03-01), Terashita
patent: 4659213 (1987-04-01), Matsumoto
patent: 4692794 (1987-09-01), Suzuki
patent: 4707120 (1987-11-01), Yamamoto

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