Image processors are provided for respective groups formed by grouping of images, the order of which is sequential when images respectively having overlapping portions corresponding to the same portion of an object are arranged so as to be adjacent to each other, and concurrently perform processing to detect combining-position information for combining an image in a group and an image adjacent to the image without any positional displacement by image-matching. The combining-position information between images belonging to different groups is respectively transferred, via combination-information transferring paths, between the image processors and between the image processors.

A scanner includes a generator that synthesizes output of a first sensor group and output of a second sensor group where the image data overlaps in part, and generates image data; and a controller that controls the second sensor group to synthesize and output the output of n photoelectric conversion elements at positions based on the relative positions of the first sensor group and second sensor group.

An image reading device includes: an FB glass; a sensor module having a light source and a plurality of sensors; and an image processor that generates correction data to be used for shading correction and performs the shading correction on image signals by using the correction data. The plurality of sensors is arranged in a main scanning direction and is configured to form an image signal on a single line. The image processor acquires second black data by causing the plurality of sensors to acquire an image signal of a reference sheet placed on the FB glass with the light source turned on, and generates black correction data based on the second black data. By performing the shading correction by using the black correction data, the image processor corrects density unevenness, in an image, caused by interference between image signals from the plurality of sensors.

A method is disclosed. For example, the method executed by a processor of a multi-function device (MFD) includes executing a defect learning routine to identify defects, cataloging the defects based on a job function, a type of paper, and a machine state, receiving a job request, determining a known defect that has been catalogued based on the job function, the type of paper, and the machine state, and presenting a visualization of the known defect on a display of a user interface before executing the job request.

An image sensor unit (1A) includes: a light condenser (40) that condenses light including image information of an illuminated object; an image sensor (48) that receives the light passed through the light condenser (40) and that converts the light to an electrical signal; and a frame (10A) that houses the light condenser (40) and the image sensor (48), wherein the image sensor unit (1A) includes an urging member (50A) that urges and fixes the light condenser (40) to the frame (45), and the urging member (50A) urges and fixes the light condenser (40) to the frame (10A) from a light entering side or a light emission side of the light.

A method is disclosed. For example, the method executed by a processor of a multi-function device (MFD) includes executing a defect learning routine to identify defects, cataloging the defects based on a job function, a type of paper, and a machine state, receiving a job request, determining a known defect that has been catalogued based on the job function, the type of paper, and the machine state, and presenting a visualization of the known defect on a display of a user interface before executing the job request.

A flatbed scanner includes a carriage for reading an original while moving in a first direction; an acquisition portion for acquiring a size of the original in the first direction; and a control portion for reading the original while moving the carriage at a lower speed in a first case where the original is large than in a second case where the original is small.

A flatbed scanner includes a carriage for reading an original while moving in a first direction; an acquisition portion for acquiring a size of the original in the first direction; and a control portion for reading the original while moving the carriage at a lower speed in a first case where the original is large than in a second case where the original is small.

An image forming apparatus includes a conveyor, an image former, and a reading device. The conveyor conveys a medium in a conveyance direction. The image former forms an adjustment pattern on one side of the medium conveyed by the conveyor. The reading device downstream from the image former in the conveyance direction reads the adjustment pattern on the one side of the medium conveyed by the conveyor to generate read data. The adjustment pattern includes a first line segment and a second line segment that extend in directions different from each other and each are inclined with respect to the conveyance direction.

Examples of systems having scanners are described. In an example, a system includes a 3-channel scanner and a 1-channel scanner.