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US 2019/0174019 A1Published application
Image reading apparatus and image reading method
AssigneeCanon Kabushiki Kaisha
InventorKenji Ooki
Life of this patent
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Abstract
Provided is an image reading apparatus configured to avoid unnecessarily performing shading correction processing. The image reading apparatus detects whether or not an original is placed on an original tray when detecting an open state of an ADF and then detecting a closed state thereof. In a case where the original is placed on the original tray, the image reading apparatus performs shading correction for flow reading, and in a case where no original is placed on the original tray, the image reading apparatus performs shading correction for platen cover reading.
Claims15
An image reading apparatus, comprising:
- an original table on which an original is to be placed;
- a document feeder configured to convey the original, the document feeder including:
- an original tray on which the original is to be placed;
- a first sensor configured to detect that the original is placed on the original tray;
- a conveyor configured to convey the original placed on the original tray;
- and
- a sheet discharge tray to which the original is to be discharged;
- a reference member;
- a second sensor configured to detect an open state and a closed state of the document feeder;
- a reading unit configured to read one of the original placed on the original table and the original to be conveyed by the document feeder,
- the reading unit being configured to read the original placed on the original table under a state in which the reading unit is moving a reading position in a first mode, and to read the original to be conveyed by the conveyor to a predetermined reading position in a second mode;
- an image processor configured to perform shading correction on image data output from the reading unit in the first mode with use of first shading correction data, and to perform shading correction on image data output from the reading unit in the second mode with use of second shading correction data;
- and
- a processor configured to generate one of the first shading correction data for the first mode and the second shading correction data for the second mode based on a result of reading the reference member by the reading unit,
- wherein, in a case where the first sensor detects that no original is placed on the original tray and the second sensor detects that the original table is changed from the open state, the processor generates the first shading correction data, and
- wherein, in a case where the first sensor detects that the original is placed on the original tray and the second sensor detects that the original table is changed from the open state, the processor is prevented from generating the first shading correction data.
13 more elements
An image reading apparatus, comprising:
- an original table on which an original is to be placed;
- a first sensor configured to detect presence or absence of the original to be placed on the original tray;
- a reading unit configured to read an image from the original;
- a reference member to be used for shading correction;
- a conveyor configured to convey the original from the original tray to a reading position to be used by the reading unit;
- an original table on which an original from which an image is read under a state in which the reading unit is being moved is to be placed;
- a platen cover freely openable and closable with respect to the original table;
- a second sensor configured to detect one of an open state and a closed state of the platen cover;
- a shading corrector configured to generate, in accordance with a result of reading the reference member by the reading unit, first shading correction data to perform shading correction in a case where the reading unit reads the original conveyed from the original tray, and to generate second shading correction data to perform shading correction in a case where the reading unit reads the original placed on the original table;
- and
- a controller configured to, in a case where the first sensor detects that the original is placed on the original tray:
- cause the shading corrector to generate the first shading correction data to perform the shading correction regardless of a detection result of the second sensor;
- and
- move the reading unit to a position for reading the original conveyed from the original tray to cause the reading unit to read the image of the original.
11 more elements
An image reading method to be executed by an apparatus including:
- an original tray on which an original is to be placed;
- a first sensor configured to detect presence or absence of the original placed on the original tray;
- a reading unit configured to read an image from the original;
- a reference white plate to be used for shading correction of the reading unit;
- a conveyor configured to convey the original from the original tray to a reading position to be used by the reading unit;
- an original table on which an original from which an image is read under a state in which the reading unit is being moved is to be placed;
- a platen cover freely openable and closable with respect to the original table;
- a second sensor configured to detect one of an open state and a closed state of the platen cover;
- and
- a shading corrector configured to generate, in accordance with a result of reading the reference white plate by the reading unit, first shading correction data to perform shading correction when the reading unit reads the original conveyed from the original tray, and to generate second shading correction data to perform shading correction when the reading unit reads the original placed on the original table,
- the image reading method comprising:
- generating, by the shading corrector, the first shading correction data to perform the shading correction regardless of a detection result of the second sensor in a case where the first sensor detects that the original is placed on the original tray;
- and
- moving the reading unit to a position for reading the original conveyed from the original tray to cause the reading unit to read the image of the original.
11 more elements
Dependencies are inferred from the claim text.