IMAGE READING APPARATUS, IMAGE READING METHOD, AND PROGRAM FOR IMPLEMENTING THE METHOD
First Claim
1. An image reading apparatus comprising:
- an image sensor adapted to read an image formed on an original;
an opposing member that is arranged at a position opposite to said image sensor;
a distancing member that distances the original from said opposing member; and
a boundary detecting unit adapted to detect, from changes in a sub-scanning direction of pixel data of a read image generated based on output from said image sensor, shadow portions of the read image and to obtain boundary coordinate data of the image of the original.
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Abstract
An image reading apparatus in which the position of the boundary between an image of an original and a background image, as well as a skew and the size of the image of the original, can be accurately detected even with dust on a line image sensor or on an opposing member opposite to the line image sensor. An image formed on an original is read by a reading unit, and an opposing member is arranged at a position opposite to the reading unit. A plate glass distances the original from the opposing member. Shadow portions of the read image is detected from changes in a sub-scanning direction of pixel data of a read image generated based on output from the reading unit, and boundary coordinate data of the image of the original is obtained.
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Citations
14 Claims
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1. An image reading apparatus comprising:
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an image sensor adapted to read an image formed on an original; an opposing member that is arranged at a position opposite to said image sensor; a distancing member that distances the original from said opposing member; and a boundary detecting unit adapted to detect, from changes in a sub-scanning direction of pixel data of a read image generated based on output from said image sensor, shadow portions of the read image and to obtain boundary coordinate data of the image of the original. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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- 8. An image reading method applied to an image reading apparatus comprising an image sensor that reads an image formed on an original, an opposing member that is arranged at a position opposite to the image sensor, and a distancing member that distances the original from the opposing member, the method comprising a boundary detecting step of detecting, from changes in a sub-scanning direction of pixel data of a read image generated based on output from the image sensor, shadow portions of the read image and obtaining boundary coordinate data of the image of the original.
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14. A program for causing a computer to implement an image reading method applied to an image reading apparatus comprising an image sensor that reads an image formed on an original, an opposing member that is arranged at a position opposite to the image sensor, and a distancing member that distances the original from the opposing member, the program comprising a boundary detecting module of detecting, from changes in a sub-scanning direction of pixel data of a read image generated based on output from the image sensor, shadow portions of the read image and obtaining boundary coordinate data of the image of the original.
Specification