Image density reading apparatus capable of selecting a desired a

Details Image density reading apparatus capable of selecting a desired a Image density reading apparatus capable of selecting a desired a

1990-07-03

1993-03-23

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358475, H04N 140

Patent

active

051969483

ABSTRACT:
An image density reading apparatus in which an image of a document is irradiated by a light source and a density signal is generated from an image light reflected from the image. In the apparatus, there is an amplifier for amplifying a density signal on the basis of an amplifying gain and a signal processor for processing the amplified density signal in accordance with a predetermined processing algorithm to output a gain control signal. The amplifier is provided with a switch for changing a gain in response to the gain control signal.

REFERENCES:
patent: 4408231 (1983-10-01), Bushaw et al.
patent: 4660082 (1987-04-01), Tomohisa et al.
patent: 4980778 (1990-12-01), Wittman
patent: 5014332 (1991-05-01), Nakajima et al.

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