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

1986-05-21

1988-09-13

Blum, Theodore M.

Image analysis

Histogram processing

For setting a threshold

358287, G06K 942

Patent

active

047714735

ABSTRACT:
An apparatus for reading an image of a document, comprising: (1) an optical projection apparatus for projecting an image of a document; (2) an image reading section for transforming the projected image into electrical image signals; (3) a first variable magnification section for varying optically the size of the image to be projected on the image reading means; (4) a second variable magnification section for varying electrically the size of the image projected on the image reading section by transforming the electrical image signals received from the image reading section into other electrical image signals which correspond to a size of image different from the original size; and (5) a variable magnification control section for controlling the first and second variable magnification circuit so as to give image signals having a magnification designated.

REFERENCES:
patent: 3921136 (1975-11-01), Bar-Lev
patent: 4302782 (1981-11-01), Gunning et al.
patent: 4366508 (1982-12-01), Crean et al.
patent: 4453643 (1985-09-01), Shibazaki et al.
patent: 4587621 (1986-05-01), Du Vall

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