Image reader

Details Image reader Image reader

1990-11-26

1991-09-10

Razavi, Michael

Image analysis

Histogram processing

For setting a threshold

382 61, 358451, 358474, 358406, 355 55, 355 56, G06K 900

Patent

active

050481061

ABSTRACT:
An image reader having a scanning optical means for a document, a projection lens and an image sensor for reading an image of a document is disclosed. The image reader includes a pattern element on which a predetermined pattern having two edges symmetric with respect to the optical axis of the projection lens at a predetermined reading magnification and a circuit for determining the center position of an image of a document based on data obtained when the predetermined pattern is read by the image sensor through the projection lens at a designated reading magnification.

REFERENCES:
patent: 4086478 (1978-04-01), Okano
patent: 4357596 (1982-11-01), Feilchenfeld
patent: 4384272 (1983-05-01), Tanaka et al.
patent: 4420742 (1983-12-01), Tadauchi et al.
patent: 4464681 (1984-08-01), Jacobs et al.
patent: 4471386 (1984-09-01), Tuhro
patent: 4517606 (1985-05-01), Yokomizo et al.
patent: 4724330 (1988-02-01), Tuhro
patent: 4728984 (1988-03-01), Daniele
patent: 4751376 (1988-01-01), Sugiura et al.
patent: 4868610 (1989-09-01), Ito et al.
patent: 4956672 (1990-09-01), Shibazaki et al.

Affiliated with

Also associated with

Rating

Image reader does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Image reader, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image reader will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-546920