Reading apparatus with shading correction using a white reference member, reading method, image forming apparatus, and image forming system
AssigneeCanon Kabushiki Kaisha
InventorShinichi Seo
Life of this patent
Estimating the term…
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.
Claims9
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 white reference member provided at the one side;
- a shading corrector configured to perform shading correction on a result of reading the original by the reading unit, based on shading data and a correction coefficient;
- and
- a processor configured to obtain the shading data, based on a result of reading the white reference member by the reading unit, and configured to calculate the correction coefficient from a result of reading a reference original, which is placed on the guide member,
- wherein the processor 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.
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 white reference member provided at the one side;
- a shading corrector configured to perform shading correction on a result of reading the original by the reading unit, based on shading data and a correction coefficient;
- and
- a processor configured to calculate the correction coefficient from a result of reading a reference original, which is placed on the guide member,
- wherein the processor 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.
Dependencies are inferred from the claim text.