IMAGE READING APPARATUS, CONTROL METHOD THEREFOR, AND PROGRAM
First Claim
1. An image reading apparatus comprising:
- a original platen on which an original document is placed;
a light source that emits light toward the original document on said original platen;
a sensor that reads an image of the original document on said original platen;
a reading unit that executes a Light-on reading processing for turning on said light source and causing said sensor to read the original document on said original platen at a first resolution, and a Light-off reading processing for turning off said light source and causing said sensor to read the original document on said original platen at a second resolution;
an image processing unit that removes an influence of external light included at a reading position outside the original document in a Light-on mode image read by the Light-on reading processing, in accordance with an influence of external light included at a reading position outside the original document in a Light-off mode image read by the Light-off reading processing; and
a specifying unit that specifies a boundary between the inside and outside of the original document on said original platen based on the Light-on mode image in which said image processing unit has removed the influence of external light.
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Accused Products
Abstract
There is provided an image reading apparatus and a control method therefor, which can suppress the influence of external light, and obtain an appropriate read image. To accomplish this, the image reading apparatus executes a Light-on reading processing for turning on an LED and causing a sensor to read an original document on a original platen at the first resolution, and a Light-off reading processing for turning off a light source and causing the sensor to read the original document on the original platen at the second resolution. In accordance with the influence of external light in an Light-off mode image read by the Light-off reading processing, the image reading apparatus removes the influence of external light in a Light-on mode image read by the Light-on reading processing.
19 Citations
20 Claims
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1. An image reading apparatus comprising:
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a original platen on which an original document is placed; a light source that emits light toward the original document on said original platen; a sensor that reads an image of the original document on said original platen; a reading unit that executes a Light-on reading processing for turning on said light source and causing said sensor to read the original document on said original platen at a first resolution, and a Light-off reading processing for turning off said light source and causing said sensor to read the original document on said original platen at a second resolution; an image processing unit that removes an influence of external light included at a reading position outside the original document in a Light-on mode image read by the Light-on reading processing, in accordance with an influence of external light included at a reading position outside the original document in a Light-off mode image read by the Light-off reading processing; and a specifying unit that specifies a boundary between the inside and outside of the original document on said original platen based on the Light-on mode image in which said image processing unit has removed the influence of external light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16, 17, 18, 19, 20)
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14. A control method for an image reading apparatus, comprising:
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executing a Light-on reading processing for turning on a light source which emits light toward an original document on a original platen and causing a sensor to read an image of the original document on the original platen at a first resolution, and a Light-off reading processing for turning off the light source and causing the sensor to read the original document on the original platen at a second resolution; removing an influence of external light included at a reading position outside the original document in a Light-on mode image read by the Light-on reading processing, in accordance with an influence of external light included at a reading position outside the original document in a Light-off mode image read by the Light-off reading processing; and specifying a boundary between the inside and outside of the original document on the original platen based on the Light-on mode image in which the influence of external light has been removed in the removing step. - View Dependent Claims (15)
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Specification