A medium transportation device includes a supply roller configured to send a medium downstream, at least one stopper configured to be switched between a blocking state in which the at least one stopper blocks the transportation path and an open state in which the at least one stopper opens the transportation path, and a controller configured to perform skew correction control in which a leading edge of the medium is brought in contact with the at least one stopper in the blocking state to correct skew of the medium. The controller is configured to obtain information about a stiffness of the medium and, when a second medium having a lower stiffness than a first medium is transported, the controller switches the at least one stopper from the blocking state to the open state to end the skew correction control earlier than the skew correction control of the first medium.

An image processing apparatus (10) includes: a restriction processing portion (54) that, in a case where a difference between a separation distance between a pair of regulating portions (15) and a reference distance exceeds a threshold value, restricts execution of a reading process that reads image data of a document sheet place on a document sheet placing portion (11); a determination processing portion (52) that, in a case where an output process that outputs the image data read by the reading process is executed, determines whether or not the output process is a specific fax transmission process that establishes a communication connection for fax communication before execution of the reading process; and a prohibition processing portion (56) that, in a case where it is determined that the output process is the specific fax transmission process, prohibits restriction on the execution of the reading process.

A reading device and an image forming apparatus are provided. The reading device includes an image reading device configured to read an image on a recording medium being conveyed, a background device serving as a background image when the image is read by the image reading device, and a foreign-object detector configured to compare a first read image obtained as the background device is read by the image reading device with a second read image obtained as the background device and the recording medium are read by the image reading device to detect an attached foreign object. The image forming apparatus includes the reading device and an image forming device.

An image reading device includes a background unit, a reading unit, and circuitry. The background unit is configured to be a background in reading of a recording medium and includes a first region that is black and a second region that is different from the first region. The reading unit is configured to read an image with the background unit as the background, and generate a read value based on a result of reading the image with the background unit. The circuitry is configured to correct the read value based on a reference value generated by the reading unit by reading the second region of the background unit.

An information processing system that manages an application executed by an image processing apparatus with an application identifier includes one or more controllers configured to provide combined information of a reproduction application that reproduces a description file for defining operation procedures and a first description file as a first combined application, provide combined information of the reproduction application and a second description file as a second combined application, manage a first description identifier corresponding to the first description file and a second description identifier corresponding to the second description file, and manage the first combined application and the second combined application in a distinguishable manner based on the first description identifier and the second description identifier.

An image reading apparatus includes an output tray that receives a medium which is output thereon; an output roller pair that outputs the medium onto the output tray; an output-tray posture switching portion that switches a posture of the output tray with respect to the apparatus body; and an output-direction switching portion that switches an output direction of the medium by using the output roller pair. The output roller pair includes an output driving roller, and an output driven roller that nips the medium between the output driven roller and the output driving roller and that follows the rotation of the output driving roller. The output-direction switching portion switches the output direction of the medium by displacing a rotation center of the output driven roller around a rotation center of the output driving roller.

An image reading apparatus includes a first posture detection unit that detects a first posture that is a posture of the apparatus main body when not in use, a second posture detection unit that detects a second posture that is a posture of the apparatus main body when in use, and a posture change detection unit that detects a change in a posture of the apparatus main body. When the first posture detection unit detects a switchover of the apparatus main body to the first posture in a first power supply mode in which power is supplied to the first posture detection unit, the second posture detection unit, and the posture change detection unit, the first power supply mode transitions to the second power supply mode in which a controller supplies power to only the posture change detection unit.

When a medium detector detects that a state where a medium is absent is switched to a state where the medium is present with a light quantity of the medium detector set to a first light quantity, a controller in an image reading apparatus switches the light quantity from the first light quantity to a second light quantity, which is larger than the first light quantity. When a quantity of the light received by the medium detector exceeds a threshold, the controller determines whether the media overlaps each other, based on the detection result of the multi-feed detector. When the quantity of the light received does not exceed the threshold, the controller skips the determination of whether the media overlaps each other.

An image forming apparatus includes a reading table, an image reading device, an image forming device with an exposure device, and circuitry. The reading device reads a pattern on a recording medium on the table, and generates image data of the pattern. The exposure device includes a light emitting element to form an electrostatic latent image, based on which the image forming device forms the pattern. Based on first and second correction values, the circuitry calculates a third correction value to correct a light amount of the light emitting element. The exposure device includes a driving device that drives the light emitting element based on the third correction value. The circuitry sets at least two or more determination areas in each of a white area and a pattern area of the medium, and determines whether the medium has a rise based on density data in the determination areas.

A reading apparatus that reads a radiograph from an imaging plate includes: a first light source that irradiates the imaging plate with excitation light; a first detector that detects photostimulated light from the imaging plate emitted by the excitation light; a second light source that irradiates an object with light; and a second detector that detects reflected light of the light from the object.