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US 2018/0084150 A1Published application
Reading apparatus, reading method, image forming apparatus, andimage forming system
AssigneeCanon Kabushiki Kaisha
InventorShinichi Seo
Life of this patent
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Abstract
Provided is a reading apparatus capable of preventing luminance unevenness in a reading range by correcting shading data. An original reading unit of a reading apparatus configured to read an image on an original includes a row of light receiving elements aligned in a main scanning direction orthogonal to a direction in which the original is conveyed. The reading apparatus generates shading data used in shading correction, based on the result of reading a white reference board via the original reading unit.
Claims11
A reading apparatus, comprising:
- a conveyor configured to convey an original;
- a guide member, having a one side and the opposite other side, configured to guide the original conveyed by the conveyor in a conveyance direction at the opposite other side;
- a reading unit configured to read the original conveyed by the conveyor;
- a reference member provided at the one side;
- an obtaining unit configured to obtain shading data, based on a result of reading the reference member by the reading unit;
- a shading correction unit configured to perform shading correction on a result of reading the original by the reading unit, based on the shading data and a correction coefficient;
- and
- a calculation unit configured to calculate the correction coefficient from a result of reading a reference original, which is placed on the guide member,
- wherein the calculation unit is configured to calculate the correction coefficient outside an area of the reference original in a main scanning direction, which is orthogonal to the conveyance direction, based on a result of reading the reference original inside the area of the reference original in the main scanning direction.
6 more elements
A reading method for a reading apparatus configured to read an image on an original, comprising:
- conveying the original;
- obtaining shading data based on a result of reading a reference member, which is provided at one side of a guide member, the guide member having the opposite other side and being configured to guide the original that is being conveyed in a conveyance direction at the opposite other side;
- reading the original that is being conveyed;
- calculating a correction coefficient based on a result of reading a reference original, which is placed on the guide member;
- and
- performing shading correction on the result of reading the original, based on the shading data and the correction coefficient,
- wherein the calculating a correction coefficient comprises calculating the correction coefficient outside an area of the reference original in a main scanning direction, which is orthogonal to the conveyance direction, based on a result of reading the reference original inside the area of the reference original in the main scanning direction.
4 more elements
An image forming apparatus, comprising an image forming unit configured to form an image on a given recording medium based on read data read by a reading apparatus, wherein the reading apparatus comprising:
- a conveyor configured to convey an original;
- a guide member, having a one side and the opposite other side, configured to guide the original conveyed by the conveyor in a conveyance direction at the opposite other side;
- a reading unit configured to read the original conveyed by the conveyor;
- a reference member provided at the one side;
- an obtaining unit configured to obtain shading data, based on a result of reading the reference member by the reading unit;
- a shading correction unit configured to perform shading correction on a result of reading the original by the reading unit, based on the shading data and a correction coefficient;
- and
- a calculation unit configured to calculate the correction coefficient from a result of reading a reference original, which is placed on the guide member,
- wherein the calculation unit is configured to calculate the correction coefficient outside an area of the reference original in a main scanning direction, which is orthogonal to the conveyance direction, based on a result of reading the reference original inside the area of the reference original in the main scanning direction.
6 more elements
An image forming system, comprising:
- a reading apparatus;
- and
- an image forming apparatus configured to form an image on a given recording medium based on read data read by the reading apparatus, wherein the reading apparatus comprising:
- a conveyor configured to convey an original;
- a guide member, having a one side and the opposite other side, configured to guide the original conveyed by the conveyor in a conveyance direction at the opposite other side;
- a reading unit configured to read the original conveyed by the conveyor;
- a reference member provided at the one side;
- an obtaining unit configured to obtain shading data, based on a result of reading the reference member by the reading unit;
- a shading correction unit configured to perform shading correction on a result of reading the original by the reading unit, based on the shading data and a correction coefficient;
- and
- a calculation unit configured to calculate the correction coefficient from a result of reading a reference original, which is placed on the guide member,
- wherein the calculation unit is configured to calculate the correction coefficient outside an area of the reference original in a main scanning direction, which is orthogonal to the conveyance direction, based on a result of reading the reference original inside the area of the reference original in the main scanning direction.
9 more elements
Dependencies are inferred from the claim text.