Image reading apparatus outputting corrected image signals

Details Image reading apparatus outputting corrected image signals Image reading apparatus outputting corrected image signals

1991-03-29

1992-10-06

Mancuso, Joseph

Image analysis

Histogram processing

For setting a threshold

35921319, 387 58, 387 67, G06K 920

Patent

active

051539292

ABSTRACT:
Image reading apparatus outputting corrected image signals includes at least one linear sensor for reading an image of an original. The linear sensor has a plurality of photodiodes and a transfer shift register. The shift register outputs image signals from a portion thereof connected to a plurality of photodiodes and outputs a dummy signal from a portion thereof unconnected to the plurality of photodiodes. A detecting circuit detects a level of the dummy signal output from the linear sensor, and a control circuit controls a level of the image signal output from the linear sensor in accordance with the level of the dummy signal detected by the detecting circuit.

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