Document reading apparatus for detection of curvatures in docume

Details Document reading apparatus for detection of curvatures in docume Document reading apparatus for detection of curvatures in docume

1990-09-26

1992-01-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250561, H01J 4014

Patent

active

050846116

ABSTRACT:
A document reading apparatus comprising a document table, a reading section disposed above the document table for reading a document, e.g. an opened book, placed on the document table, and a linear light source for emitting light to the opened book at an angle thereto. The reading section includes a sensor for detecting an image of the light emitted to the book. This image displays a brightness distribution over surfaces of the opened book including curvatures adjacent the joint. The brightness distribution is used as a reference for rectifying an image signal corresponding to the opened book when the document image is reproduced.

REFERENCES:
patent: 3621222 (1971-11-01), Minami
patent: 4276561 (1981-06-01), Friedman
patent: 4811114 (1989-03-01), Yamamoto et al.

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