Image reader with platen criterial mark for determining document

Details Image reader with platen criterial mark for determining document Image reader with platen criterial mark for determining document

1990-10-17

1991-11-26

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 65, 358449, 358453, G06K 920, G06K 710, G06K 720

Patent

active

050689134

ABSTRACT:
An image reader which has a criterion member arranged at the upstream side of a platen with respect to the subscan direction and controls a scanner so as to scan the criterion member and subsequent thereto the document. The criterion member is used to determine a reference edge from which the image reading of the document should be started.

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patent: 4763200 (1988-08-01), Nakatani et al.
patent: 4823m395 (1989-08-01), Chikauchi

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