A document reading device includes an imaging unit that images a document, a placing portion that includes a first placing portion and a second placing portion and that has a placing surface on which the document is placed, the placing surface being formed by the first placing portion and the second placing portion, and a detector that detects an edge of the document that is placed on the placing surface by using a color difference or a luminance difference between the placing surface and the document. An end portion of the first placing portion adjacent to the second placing portion extends toward the second placing portion beyond an end portion of the second placing portion adjacent to the first placing portion.

An image reading apparatus comprises a first reading unit configured to output an analog signal by reading an original, a second reading unit different from the first reading unit, a conversion unit configured to convert analog signals outputted from the first reading unit and the second reading unit to digital signals, a wire connection control unit configured to control wire connection between the first reading unit and the second reading unit, and the conversion unit, and an output control unit configured to control an output of an analog signal from the first reading unit.

An automatic document feeder, which is included in an image reading device and an image forming apparatus, includes first and second document trays, a document output tray, a document conveying passage, multiple document conveying bodies, a drive source, a detector, and a controller. The multiple document conveying bodies include a document holding and conveying body to convey and hold the original document sheet on the second document tray. On detection of the original document sheet on the second document tray while conveying a different original document sheet from the first document tray, the controller stops feeding the different original document sheet, causes the different original document sheet downstream from the document holding and conveying body in a document conveying direction to be conveyed to the document output tray, and stops the drive source after the different original document has been conveyed to the document output tray.

An image scanning apparatus that is capable of executing control about an interrupt scan without using another apparatus. The image scanning apparatus includes a scanner and a controller. The scanner scans a document. The controller determines whether interrupt execution of a second scan that is different from a first scan is permitted based on a setting relevant to the first scan that is being executed. The scanner executes the second scan after suspending the first scan in a case where the interrupt execution of the second scan is permitted, and the scanner restarts the first scan after executing the second scan.

An image reading apparatus includes a first holding member that is provided with a first holding surface opposed to a placement surface, a second holding member that is provided with a second holding surface opposed to the placement surface, a guide member that is disposed on a front side of the first holding member and the second holding member, and an imaging unit that capture a medium placed on the placement surface, wherein the guide member is provided with a guide surface coupled to the first holding surface and the second holding surface and is disposed such that a distance from the placement surface to a first portion of the guide surface is smaller than a distance from the placement surface to a second portion of the guide surface disposed closer to the front side than the first portion.

An image reading apparatus comprises a first reading unit configured to output an analog signal by reading an original, a second reading unit different from the first reading unit, a conversion unit configured to convert analog signals outputted from the first reading unit and the second reading unit to digital signals, a wire connection control unit configured to control wire connection between the first reading unit and the second reading unit, and the conversion unit, and an output control unit configured to control an output of an analog signal from the first reading unit.

An image scanning apparatus that is capable of executing control about an interrupt scan without using another apparatus. The image scanning apparatus includes a scanner and a controller. The scanner scans a document. The controller determines whether interrupt execution of a second scan that is different from a first scan is permitted based on a setting relevant to the first scan that is being executed. The scanner executes the second scan after suspending the first scan in a case where the interrupt execution of the second scan is permitted, and the scanner restarts the first scan after executing the second scan.

An image reading apparatus includes a first holding member that is provided with a first holding surface opposed to a placement surface, a second holding member that is provided with a second holding surface opposed to the placement surface, a guide member that is disposed on a front side of the first holding member and the second holding member, and an imaging unit that capture a medium placed on the placement surface, wherein the guide member is provided with a guide surface coupled to the first holding surface and the second holding surface and is disposed such that a distance from the placement surface to a first portion of the guide surface is smaller than a distance from the placement surface to a second portion of the guide surface disposed closer to the front side than the first portion.

A method, and document scanner system, for correcting image values recorded by an optical document scanner with multiple color cameras arranged in a staggered configuration with overlap scan areas includes storing color correction values mapped to respective color index values, where a color correction value is computed from a color difference between a first color value and a second color value of the respective overlap sets, and correcting a third color value which is a color value from the second set of color image values by a color correction value which is looked up via a color index value determined from the third color value. Thereby color variations among staggered cameras are corrected.

An image reading device includes a loading section, a reader, and a document feeder. The loading section receives loading of a document and an identification medium. The reader reads the document and the identification medium. The document feeder conveys the document to the reader. The loading section includes a second contact glass and a medium restriction section. The second contact glass receives loading of the identification medium. The medium restriction section restricts a position of the identification medium loaded on the second contact glass. The document being conveyed by the document feeder has opposite end portions and a central portion therebetween. The opposite end portions respectively include opposite ends of the document in a direction perpendicular to a conveyance direction of the document. Only the central portion, among the opposite end portions and the central portion, of the document comes in contact with the medium restriction section.