Image reading apparatus
First Claim
Patent Images
1. An image reading apparatus, comprising:
- image reading means for reading an image of a document from above;
document-guiding means for positioning the document longitudinally by contacting an edge of the document;
detection means for detecting a boundary between the document and the document-guiding means based on the image read by the image reading means;
height operating means for calculating height of the document based on the boundary detection;
image processing means for correcting the image to create a nearly distortion-free image by magnification-reduction; and
determination means for determining brightness of the document proximate to the detected boundary,wherein the document-guiding means includes means for varying brightness of a surface of the document-guiding means contacting the document based upon the determination by the determination means.
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Abstract
An image reading apparatus is for reading a document such as a book from above with the target faces thereof placed upwardly. The apparatus allows for correction of distortions of the image, without relying on the background color of the target faces of the document. An image processing device detects the boundary between the document and a document-guiding device (the document edge) on the basis of the image read by the image reading device and corrects distortions of the image with reference to the detected boundary.
36 Citations
18 Claims
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1. An image reading apparatus, comprising:
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image reading means for reading an image of a document from above; document-guiding means for positioning the document longitudinally by contacting an edge of the document; detection means for detecting a boundary between the document and the document-guiding means based on the image read by the image reading means; height operating means for calculating height of the document based on the boundary detection; image processing means for correcting the image to create a nearly distortion-free image by magnification-reduction; and determination means for determining brightness of the document proximate to the detected boundary, wherein the document-guiding means includes means for varying brightness of a surface of the document-guiding means contacting the document based upon the determination by the determination means. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An image reading method comprising the steps of;
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positioning a document by contacting an edge of the document with a surface of a document guide; transmitting light from the surface of the document guide; detecting an edge of the document; determining brightness of the document proximate to the detected edge; changing a brightness of the light transmitted from the surface of the document guide based upon the determined brightness; and reading the document. - View Dependent Claims (9, 10, 11, 12)
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13. An image reading apparatus, comprising;
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scanning means for scanning a document; document guiding means, having a surface which contacts an edge of the document, for positioning the document; detecting means for detecting the edge of the document; and determination means for determining brightness of the document proximate to the detected edge, the surface of said document guiding means transmitting light, a brightness of the transmitted light being variable based upon the determined brightness. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification