A clipping processor is configured to estimate a background pixel value which is a read value of a background board and to clip an image of an original document from a read image based on the background pixel value which is estimated, the read value changing due to an increase in distance between a sensor and the background board caused by the original document, the read image being a result of reading an area including the original document and the background board.

An image reading apparatus comprises a plate with light transparency on which a sheet is to be placed, the plate including light-responsive display elements, a scanner including a first light source and a light sensor and configured to read image information of a sheet placed on the plate according to light detected by the light sensor in response to light irradiated by the first light source, and a second light source that is controlled to irradiate light on a portion of the light-responsive display elements in the plate to produce a visible image on the plate.

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 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.

An image reading apparatus is provided with a reader which reads a document, a transport roller which is provided on an upstream side of the reader in a document transport path in which the document is transported and transports the document to a reading position of the reader, and a controller which receives reading data of the reader and controls the transport roller, in which the controller receives the reading data from the reader to acquire a form of the document, and selects whether or not to stop driving of the transport roller based on the form.

A method and system of controlling at least one printbar in a printing system are described. The printing system has one or more of printbars distributed along a media transport. A first image including a reference pattern is generated on a print medium with a first printbar. A pattern is then detected on the print medium. The reference pattern and the detected pattern are used to determine a position of the first image relative to a second printbar. This position is used to configure nozzle data for a second image to be generated on the print medium by the second printbar.

A printing apparatus capable of adding number information differing from copy set to copy set, to a printing target image includes a judging unit configured to judge whether to add user information indicating a current user to a printing target image, and a determination unit configured to determine a position to which the number information is to be added, based on a result of the judgment performed by the judging unit.

A reading device includes a position reference member and a reader. The position reference member has a reference pattern that includes a line extending in a prescribed direction. The position reference member is configured to relatively move in a direction orthogonal to the prescribed direction. The reader includes a plurality of sensor chips, each of the sensor chips including a plurality of pixels. The reference pattern corresponds to each of the sensor chips of the reader.

When a size of a document is not specified, a control unit of an image reading device identifies, for image data generated as a reading result by a reading unit, a region of the document by detecting an edge of the document. When the size of the document is specified, the control unit searches the image data, at a position within a first range including a position away from an origin by a first distance, for a downstream end of the document from a downstream end of the image data toward upstream in a transport direction, and based on a position of the downstream end of the document identified by the searching, identifies as a region of the document a region corresponding to the size of the document specified.

In an information processing apparatus connected with an image forming apparatus having an image forming unit, the image forming unit includes a first receiver, a light source, a photosensitive member, a rotatable polygon mirror including a plurality of reflection surfaces, a light receiver configured to receive light, an identifier configured to identify a reflection surface to be used for scanning the photosensitive member, and a first outputter. The information processing apparatus includes a second receiver configured to receive the predetermined signal, a corrector configured to correct the image data with correction data corresponding to the reflection surface corresponding to each scan line based on the specific reflection surface, and a second outputter configured to start outputting the image data in response to start of reception of the predetermined signal.