A measurement apparatus includes a light irradiator that irradiates a measurement target with light and a processor that controls the light irradiator, in which the processor is configured to irradiate a specific place of the measurement target with the light from plural places having different positions in one direction, and irradiate the specific place of the measurement target with the light from the plural places having different positions in a direction intersecting the one direction.

An information processing apparatus includes a processor configured to convert the values of pixels in a glossy region of process target image data by inputting the process target image data to a first learning unit that has been trained using, as first learning data, first read image data and second read image data so as to convert the first read image data into the second read image data. The glossy region corresponds to a glossy portion of a document. The first read image data include the glossy region, and are obtained by optically reading the document in a first reading environment in which the light amount of regularly reflected light from a learning data document acquired by an image sensor is less than a regularly reflected light amount threshold. The second read image data include the glossy region, and are obtained by optically reading the document in a second reading environment in which the light amount of the regularly reflected light acquired by the image sensor is equal to or more than the regularly reflected light amount threshold. The process target image data are obtained by optically reading a process target document in the first reading environment.

An image forming apparatus includes a display panel, a sheet conveying passage, a reading unit, a light source, a chassis, and a controller. The reading unit includes a light transmitting plate and a conveying image sensor. The conveying image sensor reads a conveyed sheet, which is a sheet to print on. The chassis has a cleaning hole in which to insert a cleaning rod for rubbing the light-transmitting plate. In a maintenance mode, the controller turns on the light source, and makes the display panel display a graph showing the pixel values of the pixels included in conveyed-and-read image data acquired by reading with the conveying image sensor.

An imager is provided. The imager has an imaging platen which presents an imaging surface against which an object to be imaged can be placed. The imaging platen has a photodetector layer and a light guiding layer operable to guide light towards the object. The imager includes a light source operable to emit light into the light guiding layer. The light source is located at an edge of the light guiding layer, to guide light into the light guiding layer of the imaging platen.

In one example, a document scanner having a document-receiving platen. The platen includes a plurality of alignment patterns disposed on the platen at known positions in a coordinate system. The scanner includes overlapping staggered scan bars disposed adjacent the platen, each scan bar fixed at a position to image a one-dimensional slice of a corresponding one of the alignment patterns. The scanner further includes a controller to determine, from the imaged slice, X and Y coordinates of each corresponding scan bar within the coordinate system.

In one example, a document scanner having a document-receiving platen. The platen includes a plurality of alignment patterns disposed on the platen at known positions in a coordinate system. The scanner includes overlapping staggered scan bars disposed adjacent the platen, each scan bar fixed at a position to image a one-dimensional slice of a corresponding one of the alignment patterns. The scanner further includes a controller to determine, from the imaged slice, X and Y coordinates of each corresponding scan bar within the coordinate system.

In one example, a document scanner has a fixed-position scan bar and a built-in translatable calibration target. The scan bar has a linear array of imaging elements aimed in an imaging direction. The calibration target is spaced apart from and parallel to the linear array, and has a planar surface orthogonal to the imaging direction spanning the length of the linear array. The target is translatable during a calibration in a direction in a plane of the surface.

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.

An image scanner includes a controller configured to perform black data acquiring process for each color that includes, in a particular period of time, while controlling a light source to be turned off, controlling each of a plurality of light receiving elements to read an image of an object and transmit read data of the object to a shift register, and in a specific period of time next to the particular period of time, controlling the light source to emit light of a color different from the particular color, and controlling the shift register to output a plurality of pieces of image data of the object as a plurality of pieces of black data for the particular color, the plurality of pieces of image data corresponding to the plurality of pieces of read data of the object transmitted by the plurality of light receiving elements, respectively.

Systems and techniques for multispectral lighting reproduction, in one aspect, include: one or more light sources having different lighting spectra; and one or more computers comprising at least one processor and at least one memory device, the one or more computers programmed to drive the one or more light sources directly using intensity coefficients that have been determined by comparing first data for a multi-color reference object photographed by a camera in a scene with second data for the multi-color reference object photographed when lit by respective ones of the different lighting spectra of the one or more light sources.