Document reader

Details Document reader Document reader

1984-10-31

1986-09-30

Green, Randall L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358284, 358293, H04N 132

Patent

active

046149767

ABSTRACT:
A reference light from a reference reflective surface is projected onto an image sensor to form an output signal from the image sensor corresponding to the distribution of a reference light. This output signal is stored in a memory as a reference signal used for shading correction. An output signal from the image sensor corresponding to a document image is corrected in accordance with the reference signal. Irrespectively of whether or not the document is being read, the image sensor is irradiated by the reference light at a predetermined point of time to renew the reference signal.

REFERENCES:
patent: 3872242 (1975-03-01), Cooley
patent: 4087838 (1978-05-01), Masaki et al.
patent: 4220978 (1980-09-01), Rhyins et al.

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