Image reading device and image forming apparatus incorporating the image reading device
AssigneeRicoh Company, Ltd.
InventorsTatsuya Ishii, Hideki Hashimoto, Yoshio Konno
Life of this patent
Estimating the term…
Abstract
An image reading device includes a background unit, a reading unit, and circuitry. The background unit is configured to be a background in reading of a recording medium and includes a first region that is black and a second region that is different from the first region. The reading unit is configured to read an image with the background unit as the background, and generate a read value based on a result of reading the image with the background unit. The circuitry is configured to correct the read value based on a reference value generated by the reading unit by reading the second region of the background unit.
Claims11
An image reading device comprising:
- a background structure to be a background in reading of a recording medium;
- the background structure including:
- a first region that is black;
- and
- a second region that is disposed in line with the first region in a main scanning direction;
- a line sensor to:
- read an image with the background structure as the background;
- and
- generate a read value based on a result of reading the image with the background structure;
- circuitry configured to correct the read value based on a reference value generated by the line sensor by reading the second region of the background structure;
- a memory to store the reference value;
- and
- a calculator to calculate a correction parameter to correct the read value based on the reference value,
- wherein the circuitry is configured to correct the read value based on the correction parameter.
An image forming apparatus comprising:
- an image former to form an image on a recording medium;
- a background structure to be a background in reading of a recording medium with the image formed by the image former;
- the background structure including:
- a first region that is black;
- and
- a second region that is disposed in line with the first region in a main scanning direction;
- a line sensor to:
- read the image with the background structure as the background;
- and
- generate a read value based on a result of reading the image with the background structure;
- circuitry configured to correct the read value based on a reference value generated by the line sensor by reading the second region of the background structure;
- a memory to store the reference value;
- and
- a calculator to calculate a correction parameter to correct the read value based on the reference value,
- wherein the circuitry is configured to correct the read value based on the correction parameter.
Dependencies are inferred from the claim text.