Image reader having electrical and optical means for varying mag

Details Image reader having electrical and optical means for varying mag Image reader having electrical and optical means for varying mag

1991-07-18

1993-03-16

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

355 56, 358451, 359205, G06K 942, G03B 2734, G03B 2740, G02B 702

Patent

active

051951487

ABSTRACT:
This invention for reading an image of a document employs a optical projection magnification lens for projecting the image of a document; a movable image reading device for transforming the projected image into electrical signals and for providing a focussing adjustment; an electrical magnification process for varying electrically the size of the image projected on the image reading device; and a controller for controlling the optical projection lens, the electrical magnification process, and the movable reading device.

REFERENCES:
patent: 3921136 (1975-11-01), Bar-Lev
patent: 4074324 (1978-02-01), Barrett
patent: 4290084 (1981-09-01), Minshull et al.
patent: 4295736 (1981-10-01), Ikeda
patent: 4302782 (1981-11-01), Gunning et al.
patent: 4366508 (1982-12-01), Crean et al.
patent: 4496983 (1985-01-01), Takenaka
patent: 4505579 (1985-03-01), Furuichi
patent: 4543643 (1985-09-01), Shibazaki et al.
patent: 4587621 (1986-05-01), DuVall
patent: 4673972 (1987-06-01), Yokomizo
patent: 4679155 (1987-07-01), Mitsuka
patent: 4687944 (1987-08-01), Mitsuka et al.
patent: 4701808 (1987-10-01), Nagashima
patent: 4771473 (1988-09-01), Sugiura
Ossman, Kenneth R., "RIS with Multiple Resolutions" Xerox Disclosure Journal vol. 13, No. 3, p. 169, May/Jun. 1988.

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