Document reading apparatus for detection of curvatures in documents
First Claim
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1. A document reading apparatus comprising:
- document reading means for reading a document and outputting an image signal;
light emitting means for emitting light to said document;
detecting means for detecting an image of the light emitted from said light emitting means to said document and for judging curvatures of said document; and
rectifying means operable in response to said detecting means for rectifying said image signal received from said document reading means e.
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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.
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Citations
15 Claims
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1. A document reading apparatus comprising:
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document reading means for reading a document and outputting an image signal; light emitting means for emitting light to said document; detecting means for detecting an image of the light emitted from said light emitting means to said document and for judging curvatures of said document; and rectifying means operable in response to said detecting means for rectifying said image signal received from said document reading means e. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of reading a document comprising the steps of:
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emitting light to said document; generating an image signal corresponding to said document; deriving curvatures of said document from said image of the light emited to said document; and rectifying said image signal based on the curvatures of the document. - View Dependent Claims (15)
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Specification