Image reader

Details Image reader Image reader

1997-07-02

1999-11-09

Vu, Kim Yen

Image analysis

Image enhancement or restoration

Intensity, brightness, contrast, or shading correction

358461, 358464, H04N 140

Patent

active

059829486

ABSTRACT:
An image reader, which is capable of reading tone effects of a document precisely and can be miniaturized, includes a document glass, a light source for illuminating the document, an optical system for image formation of a reflected light from the document, an image reading section, a carriage, a driving motor for driving the carriage, a vertical scanning white reference board disposed outside an area, in which the document is mounted, within a range of reading and at least arranged apart from the carriage in a direction toward the document glass, a vertical scanning shading correction arrangement for correction to keep an image signal level at a constant level, and a locating section for locating a position in a horizontal scanning direction of the vertical scanning white reference board, whereby tone effects of the document can be read precisely and the image reader be miniaturized.

REFERENCES:
patent: 4691240 (1987-09-01), Kurusu et al.
patent: 4827351 (1989-05-01), Sakamato
patent: 5101284 (1992-03-01), Tanabe
patent: 5682252 (1997-10-01), Ando

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