A medium feeding device includes: a placement unit on which a medium is placed; a pair of edge guides that is provided at the placement unit such that the edge guides are movable in a medium width direction to guide edges of the medium in the medium width direction that is a direction intersecting a medium feeding direction; feeding rollers that feed the medium placed on the placement unit; a path state detection section that detects a detection value in accordance with a state of the medium feeding path; a guide position detection section that detects positions of the edge guides; and a control section that determines whether or not the detection value detected by the path state detection section has exceeded a threshold value.

A control unit of an image reading apparatus acquires, at an upstream position in a medium transportation direction of an abnormality determination area set for a leading-edge area of a medium, a distance WL from a center position in a medium width direction intersecting with the medium transportation direction to one edge in the medium width direction and a distance WR from the center position to the other edge in the medium width direction, and compares a value R that is a ratio between the distance WL and the distance WR or a difference therebetween with a threshold R0 determined in advance.

An image forming apparatus includes an image reading part, an image forming part, and a sheet feeding cartridge. The image reading part reads a document and obtains image data of the document. The image forming part forms an image on a sheet on the basis of the image data. The sheet feeding cartridge stores several kinds of the sheets. In a case where predetermined sheet feeding information is applied on the document, the sheet feeding information is read on the basis of the image data. Conveying of the sheet is controlled so as to convey the sheet corresponding to the sheet feeding information from the sheet feeding cartridge to the image forming part and, on the other hand, to eject the sheet not corresponding to the sheet feeding information from the sheet feeding cartridge without passing through the image forming part.

A verification apparatus according to one embodiment of the present disclosure selects an image associated with a code of a reference image switching sheet as a reference image when the code of the reference image switching sheet is read. An instruction is provided to discharge the reference image switching sheet to a set sheet discharging destination.

An image forming apparatus includes an image forming section, a case section, a conveyance section, a controller, an acquiring section, and storage. The controller controls the image forming section and the conveyance section according to mechanical settings information corresponding to a type of the sheet. The acquiring section acquires an identification image for identifying the type of the sheet. The storage stores therein mechanical-settings-information candidates and registered images associated with the mechanical-settings-information candidates. The controller determines whether or not a matching image exists when a sheet is loaded in the case section. Here, the matching image is a registered image matching the identification image of the registered images. The controller adjusts mechanical settings information based on a mechanical-settings-information candidate associated with the matching image of the mechanical-settings-information candidates when determining that the matching image exists.

A medium transport apparatus includes a medium transport path through which a medium passes, a path state detection section configured to output a detection value corresponding to a state of the medium transport path, a control section configured to compare the detection value output by the path state detection section with a threshold value for the detection value and determine whether an abnormal condition has occurred in the medium transport path, and a storage configured to store history information including the detection value acquired in the past, in which the control section changes the threshold value based on the history information.

At the time of copying a smaller document and a larger document on output sheets having the same size, in a first case where a first document is smaller and a second document is larger, a printing control unit analyzes a content of the second document, and copies the first document and the second document on output sheets having sizes corresponding to the analysis result. In a second case where the first document is larger and the second document is smaller, a content of the first document is analyzed, and the first document and the second document are copied on output sheets having sizes corresponding to the analysis result.

An image forming apparatus includes an image reading part, an image forming part, and a sheet feeding cartridge. The image reading part reads a document and obtains image data of the document. The image forming part forms an image on a sheet on the basis of the image data. The sheet feeding cartridge stores several kinds of the sheets. In a case where predetermined sheet feeding information is applied on the document, the sheet feeding information is read on the basis of the image data. Conveying of the sheet is controlled so as to convey the sheet corresponding to the sheet feeding information from the sheet feeding cartridge to the image forming part and, on the other hand, to eject the sheet not corresponding to the sheet feeding information from the sheet feeding cartridge without passing through the image forming part.

A placement detection system includes: a placement table; an imaging device that images an object placed on the placement table to generate an input image; and a control device. The control device generates a first binarized image for the input image based on a first threshold value and determines whether the object is placed in a predetermined placement orientation. The control device changes a threshold value for a target pixel to a second threshold value higher than the first threshold value when the object is determined to be placed in the predetermined placement orientation, the target pixel being sandwiched between pixels having pixel levels lower than or equal to the first threshold value and has a higher pixel level than the first threshold value in a first region, generates a second binarized image for the target pixel based on the second threshold value, and detects a shape of the object.

An image forming apparatus includes a document reading unit configured to collectively read a plurality of source documents placed on a document table, a reference document image selector that selects, as a reference document image, an individual image representing the source document located closest to a position corresponding to a far left corner of the document table, a first relative position detector that detects a relative position between the reference document image and each of the individual images other than the reference document image, and a first pair identifier that identifies, as an image pair representing front and back faces of the same source document, a pair of individual images, the respective relative positions of which, from the reference document image in one of the both image data and from the reference document image in the other one of the both image data, are closest to each other.