Reader for original documents and method

Details Reader for original documents and method Reader for original documents and method

1990-05-09

1991-11-19

Brinich, Stephen

Image analysis

Histogram processing

For setting a threshold

G06K 938

Patent

active

050671685

ABSTRACT:
A reader for reading light reflected from or transmitted through an original document includes an adjustment apparatus for detecting the white level of an analog signal from the original document. The detection is performed before reading of the original document. The detection level is compared to a reference white level. In response to the comparison either clock signals to an image sensor or a lighting signals to a light source are varied so that any analog signal from a read document has the reference white level.

REFERENCES:
patent: 4620236 (1986-10-01), Tanaka et al.
patent: 4634885 (1987-01-01), Inoue et al.
patent: 4835615 (1987-01-01), Taniguchi et al.
patent: 4876605 (1989-10-01), Ishikawa et al.

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