Input scanner having digital and analog mode selection

Details Input scanner having digital and analog mode selection Input scanner having digital and analog mode selection

1987-10-23

1988-10-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

358294, H01J 4014, H04N 1024

Patent

active

047757990

ABSTRACT:
An input scanner is disclosed which is adapted to scan an image on an original, such as a radiographic film, and to form a digital representation of the image. The scanner comprises a transparent platen for supporting the film, a light source under the platen, and a plurality of linear arrays of photosensitive elements located above the platen for receiving light transmitted through the film. In order to improve the signal-to-noise ratio and the dynamic range of the scanner, the signals from adjacent photosensitive elements in the arrays are processed by a combination of analog and digital summing. Different levels of spatial resolution can be selected electronically without changing the physical disposition of the scanner elements.

REFERENCES:
patent: Re32164 (1986-05-01), Kruger
patent: 4287441 (1981-09-01), Smith
patent: 4318135 (1982-03-01), Allis et al.
patent: 4509826 (1985-04-01), Araghi
patent: 4556851 (1985-12-01), Levine
patent: 4562467 (1985-12-01), Bradley
patent: 4573070 (1986-02-01), Cooper
patent: 4584656 (1986-04-01), Sakai et al.
patent: 4594612 (1986-06-01), Levine

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