Image reading apparatus, control method therefor, and program
First Claim
1. An image reading apparatus comprising:
- a light source which illuminates an object;
a reading device which photoelectrically converts light reflected by the object and reads information on the object;
a density reference member which serves as a reference for correcting an image signal obtained by reading an original by said reading device;
a roller member which feeds the original to a reading position;
a comparison device which compares a second signal obtained by reading said roller member by said reading device and a third signal obtained by reading again said roller member by said reading device; and
a correction device which corrects the image signal on the basis of a first signal obtained by reading said density reference member by said reading device, and a comparison result of said comparison device.
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Accused Products
Abstract
An object of this invention is to suppress a decrease in reading efficiency while preventing image degradation. To achieve this object, an image reading apparatus includes a light source which illuminates an object, a sensor which photoelectrically converts light reflected by the object and reads information on the object, a first density reference member which serves as a reference for correcting an image signal obtained by reading an original by the sensor, a second density reference member which is different from the first density reference member, a comparison unit which compares the second signal obtained by reading the second density reference member by the sensor and the third signal obtained by reading again the second density reference member by the sensor, and a correction unit which corrects the image signal on the basis of the first signal obtained by reading the first density reference member by the sensor, and the comparison result of the comparison device.
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Citations
12 Claims
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1. An image reading apparatus comprising:
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a light source which illuminates an object;
a reading device which photoelectrically converts light reflected by the object and reads information on the object;
a density reference member which serves as a reference for correcting an image signal obtained by reading an original by said reading device;
a roller member which feeds the original to a reading position;
a comparison device which compares a second signal obtained by reading said roller member by said reading device and a third signal obtained by reading again said roller member by said reading device; and
a correction device which corrects the image signal on the basis of a first signal obtained by reading said density reference member by said reading device, and a comparison result of said comparison device. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An image reading apparatus control method of controlling an image reading apparatus having a light source which illuminates an object, a reading device which photoelectrically converts light reflected by the object and reads information on the object, a density reference member which serves as a reference for correcting an image signal obtained by reading an original by the reading device, and a roller member which feeds the original to a reading position, comprising:
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a first reading step of reading the density reference member by the reading device to generate a first signal;
a second reading step of reading the roller member by the reading device to generate a second signal;
a third reading step of reading again the roller member by the reading device to generate a third signal;
a comparison step of comparing the second and third signals; and
a correction step of correcting an image signal obtained by reading the original by the reading device on the basis of the first signal, and a comparison result in the comparison step. - View Dependent Claims (8, 9, 10, 11)
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12. A program which causes a computer to execute an image reading apparatus control method of controlling an image reading apparatus having a light source which illuminates an object, a reading device which photoelectrically converts light reflected by the object and reads information on the object, a density reference member which serves as a reference for correcting an image signal obtained by reading an original by the reading device, and a roller member which feeds the original to a reading position, comprising:
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a first reading step of reading the density reference member by the reading device to generate a first signal;
a second reading step of reading the roller member by the reading device to generate a second signal;
a third reading step of reading again the roller member by the reading device to generate a third signal;
a comparison step of comparing the second and third signals; and
a correction step of correcting an image signal obtained by reading the original by the reading device on the basis of the first signal, and a comparison result in the comparison step.
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Specification