An image scanning method applied in an image scanning device capable of scanning a card. Record background values at the time of a card being without being in a scanning channel, and the background values recorded at the time of the card being without being in the scanning channel are regarded as preset values. Before the card is scanned, check whether the background values in the scanning channel conform to the preset values. Drive the card to move a distance Y. Check whether the background values in the scanning channel conform to the preset values. Preset a preset movement distance, check whether a movement distance of the card or a distance of accumulated movements of the card exceeds the preset movement distance. Display that the card is stuck. Stop checking and proceeding with an image calibration. Start scanning the card. Complete scanning the card and withdraw the card.

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 reading apparatus includes a conveyance roller configured to convey a medium, a reading unit configured to read an image of the medium conveyed by the conveyance roller, a detection unit configured to detect a rotation phase of the conveyance roller, a storage unit configured to store index values, each index value being associated with the rotation phase of the conveyance roller and corresponding to a conveyance amount of the conveyance roller per unit rotation angle, and a timing control circuit configured to select the index value based on a detection result of the detection unit and to control a reading timing of the reading unit based on a result of comparing a cumulative value of selected index values with a threshold corresponding to a reading resolution.

An encoding apparatus includes circuitry. The circuitry is configured to read predetermined unit image data that is a predetermined plurality of pixel units of image data; generate pixel unit code data obtained by encoding the read predetermined unit image data on a pixel basis; generate predetermined unit code data obtained by encoding the read predetermined unit image data on a predetermined unit basis; compare a code length that is a data amount of the pixel unit code data with a data amount of the predetermined unit image data to make determination; and output the predetermined unit code data in a case where the code length is greater than the data amount of the predetermined unit image data and output the pixel unit code data in a case where the code length is not greater than the data amount, on basis of a result of the determination.

An image reading apparatus includes a moving unit, a first detecting unit, and a second detecting unit. The moving unit moves a calibration plate in the main scanning direction relatively to a reading apparatus. The calibration plate is a plate for calibrating the reading apparatus. The reading apparatus has a reading unit and reading glass. The reading unit is arranged in the main scanning direction. The reading glass is disposed on a reading surface side of the reading unit. The first detecting unit detects an abnormality on the calibration plate from reading results. The reading results are obtained in such a manner that, while the moving unit is controlled to move the calibration plate, the reading unit reads the calibration plate. The second detecting unit detects an abnormality on the reading glass from the reading results.

To specify the position of a crease on a document without necessitating an additional configuration, such as a new sensor and a reading angle switching mechanism. An image reading apparatus including: a light emission controlling unit controlling light emission patterns of a first light emitting unit and a second light emitting unit included in a image reading unit; and a determining unit performing determination relating to a crease produced on a document by comparing a first image obtained by reading the document in a first light emission pattern and a second image obtained by reading the document in a second light emission pattern; and wherein the second light emission pattern is different from the first light emission pattern in balance of a quantity of emitted light from the upstream side of a light receiving unit and a quantity of emitted light from the downstream side of the light receiving unit.

Example implementations relate to scan bar calibration. For example, a system for scan bar calibration may include instructions executable by a processing resource to implement a plurality of scanning settings at a scan bar index location of a scanning device. The system may further include instructions to execute a scan bar calibration of a calibration target at the scan bar index location, and generate a scan bar calibration table for the scan bar index location based on the executed scan bar calibration.

An image scanning method applied in an image scanning device capable of scanning a card. Record background values at the time of a card being without being in a scanning channel, and the background values recorded at the time of the card being without being in the scanning channel are regarded as preset values. Before the card is scanned, check whether the background values in the scanning channel conform to the preset values. Drive the card to move a distance Y. Check whether the background values in the scanning channel conform to the preset values. Preset a preset movement distance, check whether a movement distance of the card or a distance of accumulated movements of the card exceeds the preset movement distance. Display that the card is stuck. Stop checking and proceeding with an image calibration. Start scanning the card. Complete scanning the card and withdraw the card.

An image reading device includes: a platen on which a document is placed; a platen cover openable and closable with respect to the platen; a cover-open sensor which detects a fact that the open/close angle of the platen cover has passed a predetermined angle from a close state; a CCD line sensor including charge coupled devices (CCD) arranged for recording a variation in distribution for a fixed period of time of incident light when detecting passing of the platen cover; a variation amount calculator which calculates a variation amount of incident light at each distribution point on the basis of a variation in distribution recorded by the CCD line sensor; and a variation amount determination unit which determines whether or not a variation amount calculated by the variation amount calculator exceeds a predetermined threshold.

An image scanning method applied in an image scanning device capable of scanning a card. Record background values at the time of a card being without being in a scanning channel, and the background values recorded at the time of the card being without being in the scanning channel are regarded as preset values. Before the card is scanned, check whether the background values in the scanning channel conform to the preset values. Drive the card to move a distance Y. Check whether the background values in the scanning channel conform to the preset values. Preset a preset movement distance, check whether a movement distance of the card or a distance of accumulated movements of the card exceeds the preset movement distance. Display that the card is stuck. Stop checking and proceeding an image calibration. Start scanning the card. Complete scanning the card and withdraw the card.