Image reading device and image forming apparatus incorporating same
AssigneeRicoh Company, Ltd.
InventorsTatsuya Ishii, Kohtaroh Oda, Tetsuya Ofuchi, Tomoaki Suga, Yukifumi Kobayashi
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Abstract
An image reading device includes a first scanner, a second scanner, and circuitry. The first scanner is configured to read a first side of a recording medium. The second scanner is configured to read a second side of the recording medium. The circuitry is configured to generate a first correction value to correct misalignment between the first side and the second side. The circuitry is configured to input a second correction value. The circuitry is configured to correct an image based on the first correction value and the second correction value.
Claims14
An image reading device comprising:
- a first scanner configured to read a first side of a recording medium;
- a second scanner configured to read a second side of the recording medium;
- circuitry configured to:
- generate a first correction value to correct misalignment between the reading of the first side and the reading of the second side;
- set a second correction value;
- and
- correct an image based on the first correction value and the second correction value,
- wherein the set second correction value includes
- a third correction value for correcting the misalignment, between the reading of the first side and the reading of the second side, depending on a reading condition in which the recording medium is conveyed in a first direction, and
- a fourth correction value for correcting the misalignment, between the reading of the first side and the reading of the second side, depending on a reading condition in which the recording medium is conveyed in a second direction perpendicular to the first direction, and
- wherein the circuitry is configured to correct the image based on the first correction value, the third correction value, and the fourth correction value, such that the misalignment, between the reading of the first side and the reading of the second side, in each of the first direction and the second direction is corrected,
- wherein a plurality of third correction values and a plurality of fourth correction values are preset in association with each of types of recording mediums, and
- wherein the circuitry is configured to determine the third correction value and the fourth correction value, based on a type of the recording medium to be read.
An image reading device comprising:
- a first scanner configured to read a first side of a recording medium to generate a first pattern image;
- a second scanner configured to read a second side of the recording medium to generate a second pattern image;
- circuitry configured to:
- generate a first correction value to correct misalignment between the reading of the first side and the reading of the second side;
- input a second correction value;
- and
- correct an image based on the first correction value and the second correction value,
- wherein the first correction value is a value indicating a ratio of an image size of the first pattern image generated by reading the first side of the recording medium to an image size of the second pattern image generated by reading the second side of the recording medium, and
- wherein the second correction value is a value for correcting a difference between a magnification of the first scanner at which the first pattern image generated on the first side of the recording medium is read and a magnification of the second scanner at which the second pattern image generated on the second side of the recording medium is read.
Dependencies are inferred from the claim text.