A reading apparatus to convey a document set on a document tray and to read an image of the conveyed document includes a control unit and a determining unit. The control unit performs lifting control for lifting the document tray in a case where a first condition is satisfied and performs lowering control for lowering the document tray in a case where a second condition is satisfied. The determining unit determines whether a predetermined period elapses after the lifting control of previous time is started. The control unit does not perform the lowering control even if the second condition is satisfied in a case where the determining unit determines that the predetermined period does not elapse.

An image forming system includes: an image forming apparatus; and a recording material information detecting apparatus provided outside the image forming apparatus, wherein the recording material information detecting apparatus includes a recording material information detector that detects recording material information about a recording material, and the image forming apparatus includes: an image former; an operation detector; and a hardware processor.

An image processing apparatus having a reading device to read an image from a sheet includes one or more controllers to perform operations. One image is read from one sheet by using the reading device. Edge detection processing is executed on the one image. At least one pair of edges is determined from among a plurality of edges based on information of the plurality of edges detected in the edge detection processing and size information of the one sheet.

An image forming apparatus includes a sensor configured to detect a length of a sheet, which is placed on a platen, in a predetermined direction and a controller. The controller is configured to convert an image signal based on a conversion condition, control the image forming unit to form an image based on the converted image signal, and execute calibration in which the conversion condition is generated. The controller is configured, in a case in which the calibration is to be executed, to acquire information related to a size of a sheet on which a test chart is to be formed, select a sheet based on the information, form the test chart on the selected sheet, acquire reading data output from the reader, and generate the conversion condition based on the reading data.

A document feeder includes a mode selector, at least two document sensors, and a feeding determiner. The mode selector receives selection of either a normal mode for feeding documents having the same size or a mixed loading mode for feeding documents having different sizes. The document sensors are arranged at an interval in a width direction of the documents, and detect the documents. The feeding determiner performs, based on results of the detection by the document sensors, a size determination to determine a size of a document being fed and a skew determination to determine whether or not the document being fed is skewed. The feeding determiner performs the skew determination when the normal mode has been selected and performs the size determination when the mixed loading mode has been selected.

A document reading apparatus having a display unit and a placement section on which plural documents is to be placed includes a conveyance unit and a reading unit. The conveyance unit conveys a document placed on the placement section. The reading unit reads a document conveyed by the conveyance unit and generates image data. Based on at least a reading mode being set on the document reading apparatus of reading a plurality of documents of a plurality of different sizes in a single job by the reading unit, first prompting information that prompts placement of the plurality of documents at a center of the placement section in a direction perpendicular to a document conveyance direction in which the conveyance unit conveys the plurality of documents is displayed on the display unit.

An image forming apparatus includes an image forming device that forms an image on a sheet and an image reading device that conveys a document placed on a stacking portion and reads an image on the document. The image forming device outputs first and second output materials in succession. First output material constitutes a first type of sheet having a predetermined pattern image, and the second output material constitutes a second type of sheet having the predetermined pattern image. The image reading device conveys the first and second output materials in succession from the stacking portion and reads a first image and a second image. A first parameter to cause image formation using the sheet of the first type is acquired based on the first image and a second parameter to cause image formation using the sheet of the second type is acquired based on the second image.

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.

A multifunction peripheral (MFP), which successively conveys a plurality of documents stacked on a document tray and reads the document, determines whether there is a difference among sizes of the plurality of documents in response to at least one of the documents being read by a scanner, in a case where a preview operation of a read image is performed, notifies a user of a possibility that documents having different sizes are mixed and read based on a result of the determination, enables a function of performing reading corresponding to respective document size of mixed size documents in which documents having different sizes are mixed, and provides navigation for prompting re-reading of the document.

An image reading apparatus including: a conveyor that conveys a sheet on which an image is formed by an image forming apparatus; a reader that reads the sheet conveyed by the conveyor, by using a contact image sensor; and a first hardware processor that extracts an edge of the sheet by analyzing a read image by the reader, calculates a blur amount of the edge based on the extracted edge, and calculates a curl amount of the sheet based on the calculated blur amount.