An image reading apparatus includes a line sensor to read an image of a document in a read area, a storage unit to store first reference data previously acquired by reading a first white reference member opposite to light receiving elements of the line sensor, a second white reference member of which a length is shorter than a length of the line sensor in the main scanning direction, an acquiring unit to acquire reference data read by the line sensor with the second white reference member and the line sensor opposed to each other, a correction unit to correct an output of the light receiving elements not opposite to the second white reference member, based on the stored first reference data and second reference data acquired by the light receiving elements opposite to the second white reference member among the reference data acquired by the acquiring unit.

An image reading apparatus according to an embodiment includes an image reading unit that generates reference data by reading a reference surface and generates image data by reading a sheet. A reference plate includes the reference surface for generating the reference data for shading correction of the image reading unit and a background surface for background of a sheet to be read to generate the image data. A control unit controls the positions of the image reading unit and the reference plate to be at a first position relative to each other when the reference data is to be generated and at a second position relative to each other when the image data is to be generated. The second position is different from the first position. A shading correction unit performs the shading correction in the image reading unit based on the generated reference data.

An image reading apparatus includes an image scanning unit that is provided with a holding portion holding a flexible flat cable. The holding portion is protruded toward an upstream side in a sub scanning direction, and provided with a second wall part. The flexible flat cable that is extended from a connector is brought into contact with the second wall part. As for the flexible flat cable, a downward movement is regulated by a lower holding portion and an upward movement is regulated by an upper holding portion. Accordingly, the flexible flat cable does not rise.

Provided is a document reading apparatus that is able to determine a document size even when there is a large number of target document sizes to be determined. The diagonal-line-identifying unit identifies a diagonal line for determining size in image data that is read by the scanner. The document-size-determining unit determines document size in either a first determining operation or a second determining operation. The first determining operation is based on determining data that is read by arranging the scanner at a large-size determining position after a second opening/closing detecting sensor detects a closed state after detecting an open state. The second determining operation is based on change in the diagonal line for determining size in determining data that is read while the scanner scans from the large-size determining position after a first opening/closing detecting sensor detects a closed state.

An image forming apparatus automatically adjusts a printing distance from a sheet edge on the basis of a result obtained by reading, with a reader, a test sheet printed by an image former. The image former prints a solid cover sheet of a predetermined color other than white having a void portion on four sides. The test sheet is placed on OC glass having a first size guide and a second size guide on its periphery, in alignment with the origin of the first size guide and the second size guide. The reader reads the test sheet in a state in which the cover sheet is placed on the test sheet so that the void portion is disposed outside the first size guide and the second size guide.

A method for performing image processing of a physical document image. The method may include receiving an image file including an image of a physical document and a control target. The method may include measuring control target attributes of the control target. Measuring the control target attributes of the control target may include numerically measuring a degree of focus of the image file based on the control target. The method may include performing a static crop of the image file based on the control target attributes by removing the control target from the image file to create a cropped image.

In one example, an apparatus includes a plate configured to pivot about a pivot point, a pulley coupled to a first planar side of the plate and configured to rotate a belt, a motor coupled to the first planar side of the plate and configured to drive the pulley, and a torsion spring coupled to a second planar side of the plate that is opposite the first planar side and configured to apply tension to the belt.

A reading apparatus includes a reader that obtains image data by reading a reading target, a platen on which a document to be read by the reader located at a first position is set, a first member read by the reader located at the first position if there is no document on the platen, a second member read by the reader located at a second position, which is different from the first position, and a determination unit that performs a determination process for determining whether the document is set on the platen on the basis of a first output, which is obtained if the reader located at the first position reads the reading target, and a second output, which is obtained if the reader located at the second position reads the reading target.

An image reading apparatus includes a line image sensor receiving a light reflected from an original illuminated by a light source to generate image data, an original size detector disposed away from an original positioning portion by a predetermined distance in a sub-scanning direction, an original image reading start instructing unit outputting an image reading start instruction for starting an image reading operation when being depressed by a user, and a controller determining a size of the original based on detection results of the line image sensor and the original size detector when the size of the original is not stored in a memory in a case in which the controller receives the image reading start instruction in a state in which it is detected that an angle of a pressure plate is greater than a predetermined angle.

An image reading apparatus includes an image scanning unit that is provided with a holding portion holding a flexible flat cable. The holding portion is protruded toward an upstream side in a sub scanning direction, and provided with a second wall part. The flexible flat cable that is extended from a connector is brought into contact with the second wall part. As for the flexible flat cable, a downward movement is regulated by a lower holding portion and an upward movement is regulated by an upper holding portion. Accordingly, the flexible flat cable does not rise.