Image scanner and dynamic range adjusting method thereof

Details Image scanner and dynamic range adjusting method thereof Image scanner and dynamic range adjusting method thereof

1991-06-14

1994-03-22

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358446, 358471, 358509, H04N 104, H04N 140, H04N 146

Patent

active

052969444

ABSTRACT:
An image scanner is comprised of a light source for illuminating an original document, an image sensor for receiving a reflected light from the original document and converting the same into an output signal of image data, a device for relatively moving the original document and the image sensor, an iris mechanism provided on an optical path between the original document and the image sensor, a reference reflection plane provided such that a light from the light source is reflected and the reflection light becomes incident on the image sensor, a comparing circuit for comparing a level of an output signal from the image sensor with a reference level when the image sensor receives the light from the reference reflection plane, and a device for correcting a dynamic range of the image scanner by controlling the iris mechanism on the basis of the compared output.

REFERENCES:
patent: 4907077 (1990-03-01), Schulz-Hennig et al.
patent: 4907078 (1990-03-01), Hasebe
patent: 5016048 (1991-05-01), Watanabe
patent: 5034825 (1991-07-01), Ejiri et al.

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