An image reading apparatus determines an inclination amount corresponding to an inclination angle of a leading edge of an original document in a conveyance direction, and determines the length of the original document in the conveyance direction. The image reading apparatus sets a first value as a set value in a case that the length of the original document is a first length and sets a second value larger than the first value as the set value in a case that the length of the original document is a second length shorter than the first length. If the inclination amount is smaller than the set value, inclination correction for correcting the image represented by the image data is performed such that the inclination amount is reduced, and if the inclination amount is larger than the set value, the inclination correction is not performed.

An information processing apparatus includes: a processor is configured to: read an image of at least one of a first surface or a second surface of a medium with the medium folded; discriminate whether the image is of the first surface or the second surface based on an identification image in the image; specify, based on the image, a surface on which a folding deviation occurs; and determine a correction direction of the folding deviation according to whether the surface on which the folding deviation occurs is the first surface or the second surface.

A document feeder includes an apparatus body to which a document feed unit is attached, a sheet feed tray that moves up and down toward the document feed unit, an open/close cover attached openably and closably to the apparatus body and opens the document transport path and the document feed unit when opened, and a unit pressing arm attached to the open/close cover. When the open/close cover is closed, the unit pressing arm presses the document feed unit toward the sheet feed tray.

An image processing apparatus capable of lowering the possibility that app buttons on an app selection screen will be rearranged in a way that is not intended by a user. The image forming apparatus 100 displays a plurality of app buttons for executing respective apps on a plurality of pages of an app selection screen 400 in a dividing manner, and has a structure that switches between the pages of the app selection screen 400 in response to a page switching operation by a user, and changes a display order of the app buttons when a button prioritizing event that is a condition for preferentially displaying at least one of the app buttons is detected. When the button prioritizing event is detected after the page switching operation is performed, the app buttons is not rearranged and the app selection screen is kept unchanged.

In a medium conveying device, a projector projects light, a projection light amount of the light changes, at every fixed time, to a first projection light amount and a second projection light amount less than the first projection light amount, a receiver receives the light projected from the projector, a processor determines, at fixed sampling timings, whether a reception light amount of the receiver is at a first reception light level or a second reception light level smaller than the first reception light level, determines, when the reception light amount alternately changes to the first reception light level and the second reception light level, that a medium is not present on a conveying path, and determines, when the reception light amount is fixed to either the first reception light level or the second reception light level, that the medium is present on the conveying path.

A first zone and a second zone of a scan surface may be scanned by an image sensor. A lid may be coupled to the scan surface and have an open position and a closed position, the lid being to cover the first zone and the second zone when in the closed position. The position of a lid may be determined based on a comparison of a scan of the first zone and a scan of the second zone.

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 control method for a multifunction machine includes detecting placement of a document on a document tray, displaying an object in accordance with document placement detection, storing information indicating the thickness of the document set using the object, conveying the document based on the information, and scanning the conveyed document. The object is displayed in accordance with document placement detection while a function selection screen is displayed, the information is received from a user through the object, and the document is conveyed based on the information in a case where execution of the copy function is commanded through a copy screen displayed after selection of the copy function. Even when a user places a document while a function selection screen is displayed, the thickness of the document can be set with certainty, and the document is scanned based on the set thickness.

A reading apparatus includes a transport unit that transports a document along a transport path, a multi feed detection unit that detects multi feed for a transport document that is the document being transported by the transport unit, a reading unit that reads the transported document, and a controller that controls the transport unit, wherein the controller acquires a multi feed length that is a length of a range in which multi feed occurs in the transported document according to a detection result of multi feed by the multi feed detection unit, causes the transport unit to stop transport of a document following the transport document by when the multi feed length is equal to or greater than a predetermined threshold value for the multi feed length, and causes the transport unit to perform transport of the following document when the multi feed length is less than the threshold value.

A printing system includes a printing apparatus that prints an image on a sheet, a sheet processer that executes sheet processing, and a sheet detection sensor that detects a sheet on which the sheet processing is performed not in association with the printing of an image, where the printing of an image is restricted in response to detection of a sheet by the sheet detection sensor.