Manual scan type image reader for correcting read image data to

Details Manual scan type image reader for correcting read image data to Manual scan type image reader for correcting read image data to

1990-11-05

1991-10-15

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

358473, 358474, 235442, G06K 922

Patent

active

050581880

ABSTRACT:
Thers is disclosed a manual scan type image reader for reading a document image by manually moving an image sensor for optically reading the image in a predetermined manual scan direction, converting the read document image into document image data, and outputting the converted document image data to an external unit. In the image reader, there is provided a ruler body including an image reading window for seeing the image therethrough formed on a bottom surface thereof so as to be opened to a top surface thereof, and plural scale lines printed with predetermined equal pitches in the manual scan direction on a bottom surface thereof. A scanner is mounted on the ruler body for movement in the manual scan direction, and the scanner includes the image sensor for reading the document image and the plural scale lines and converting them into document image data and scale image data, respectively. An image reading controller of the image reader corrects the document image data converted by the image sensor according to the scale image data converted by the image sensor so as to reproduce further document image data corresponding to the document image with predetermined equal pitches between the adjacent scale lines of the converted scale image data.

REFERENCES:
patent: 4420682 (1983-12-01), Huber
patent: 4445028 (1984-04-01), Huber
patent: 4819308 (1989-04-01), Kawai et al.
patent: 4894730 (1990-01-01), Yanagawa et al.
patent: 4901163 (1990-02-01), Tsujioka et al.

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