Abstract: An image reading apparatus includes: a light source; a reference sheet that reflects light emitted from the light source; a light-receiving lens that converges the reflected light; a reading sensor that reads the light converged by the light-receiving lens; and a hardware processor that: based on first white data obtained when the reading sensor reads the reference sheet for the first time, determines whether the reference sheet or the reading sensor has dust; in response to determining that the reference sheet or the reading sensor has dust, produces ideal initial white reference data by complementing the first white data with second white data obtained when the reading sensor reads the reference sheet for the second and subsequent times; and with the ideal initial white reference data, complements third white data obtained when the reading sensor reads the reference sheet right before reading an image of a job.

Abstract: An image forming apparatus includes: a light source that irradiates a document with light; a hardware processor that controls lighting of the light source; a cover that is opened and closed with respect to a document platen on which a document is placed; and a detector that detects a person. When the detector detects a person and when an open angle of the cover is a predetermined angle or less, the hardware processor turns on the light source.

Abstract: An image reading apparatus includes: a conveying roller; a conveyance guide configured to guide an original to a conveyance path, the conveyance guide including a hole in which the conveying roller is disposed; a first image reading portion configured to read an image on a first side of the original; a second image reading portion configured to read an image on a second side of the original, the second image reading portion disposed below the conveyance guide; a transparent member provided on a position apart from the second image reading portion; and a dustproof member configured to trap a foreign substance falling through a gap between the conveyance guide and the conveying roller at the hole, wherein the dustproof member partitions a space between the conveyance guide and the second image reading portion.

Abstract: An illumination device includes a light source and a rod-like light guide extending in a longitudinal direction for guiding incident light to an object to be illuminated. The light source is disposed at an end of the light guide extending in a longitudinal direction. The light guide includes an incident surface at the longitudinal end to receive light emitted from the light source, a flat emission surface to emit light incident on the light guide toward the object to be illuminated, a parabolic reflective surface to reflect, toward the emission surface, light from a focus of the paraboloid shape of the refractive surface or light passing through the focus from a predetermined area, and a light-scattering portion, having a predetermined area, to scatter light entering through the incident surface and reflect the light toward the reflective surface.

Abstract: An image processing unit includes a region separation device and a spatial filtering device. The region separation device detects line widths of a manuscript image in which the line widths are different between a vertical line and a horizontal line and determines which of the vertical line or the horizontal line is thinner. The spatial filtering device executes an emphasizing process to make a widening ratio of a thinner line of the vertical line or the horizontal line higher than a widening ratio of the other line.

Abstract: An image scanner is configured to: while changing a reading position by a position changer and sequentially emitting light of each of three colors in a turn-on sequence from a light source to a document, control a line sensor to read reflection light of emitted light, thereby acquiring gradation image data including gradation values of three colors for each pixel in one line; determine whether a top color shift occurs in the gradation image data at a determination position; in response to determining that the top color shift occurs at the determination position, replace gradation image data at the determination position with black image data; determine whether a bottom color shift occurs in the gradation image data at the determination position; and in response to determining that the bottom color shift occurs at the determination position, replace gradation image data at the determination position with white image data.

Abstract: An image reading device has a document placement stage, a light source unit, and a sensor unit. The light source unit has a first light source part having a first light source at one end in the main scanning direction and a first light guide, a second light source part having a second light source at the other end in the main scanning direction and a second light guide, a first board where the first light source is mounted, and a second board where the second light source is mounted. The first and second boards each have a board base, a mounting part where the first or second light source is mounted, and a reflection face formed next to the first or second light source. The reflection faces of the first and second board faces face, to overlap the facing faces of the second and first light guides.

Abstract: Provided is a document reading apparatus wherein plurality of color reference boards can be flexibly changed. A document reading apparatus includes a document reading module, a document cover provided at a position where the document cover faces against the document reading module, an abutment portion provided in the document cover, a plurality of color reference boards detachably set up relative to the document cover, and a coupling portion that couples the plurality of color reference boards together and that abuts against the abutment portion. Each of the plurality of color reference boards includes a surface that faces against the document reading module and that has different reflectance.

Abstract: In accordance with an embodiment, an image reading apparatus comprises a conveyance system, a reading section, a movement sensor and a processor. The conveyance system conveys a document in a conveyance route including a reading position. The reading section reads an image on a surface of the document passing through the reading position. The movement sensor detects a conveyance speed of the document conveyed by the conveyance system. In a case in which the conveyance speed of the document detected by the movement sensor differs from a reference speed, if the conveyance speed of the document is within an adjustable range, the processor performs control to adjust a reading processing in response to the conveyance speed of the document.

Abstract: A document scanning apparatus reading an image of a document includes a signal output unit configured to output a pulse signal at predetermined intervals, a sensor configured to detect a document set on a platen glass, the sensor having a light emitting unit configured to emit light in response to a pulse signal output from the signal output unit and a light receiving unit configured to output a detection signal in accordance with light output from the light emitting unit, and a control unit configured to receive the detection signal output from the light receiving unit. In this case, the signal output unit outputs the pulse signal at a different time point from the predetermined intervals in response to a request from an external apparatus.

Abstract: An image forming apparatus includes a reading section, a detection section, a determination section, and a decision section. The reading section reads an image of a first document and generates a document information item indicating the image and a sheet color of the first document. The reading section also reads an image of a second document and generates a document information item indicating the image and a sheet color of the second document. The detection section detects sheet colors based on the respective document information items. The determination section determines whether or not the sheet color each match any one of specific colors other than the white color. When the determination section determines that a sheet color matches one of the specific colors, the decision section decides a transmission address of the document information items based the one specific color.

Abstract: A reading module of the present disclosure is provided with a light source, an optical system, and a sensor. The optical system images, as reading light, reflected light of light radiated from the light source to an illumination object. The sensor converts the reading light imaged by the optical system into an electric signal. The optical system is provided with a mirror array in which a plurality of reflection mirrors are disposed in an array in a prescribed direction and a plurality of aperture stop portions that adjust an amount of the reading light. Each of the reflection mirrors is disposed at a prescribed distance from an adjacent one of the reflection mirrors in a prescribed direction.

Abstract: A scanner includes: a first mirror having a plurality of concavities configured to reflect light from a document; a sensor group having a sensor chip with a photoelectric conversion element line configured to detect light reflected by the concavity; and an aperture member having a plurality of apertures corresponding one-to-one to the concavities and disposed between the first mirror and the sensor group on an optical path of light reflected by the concavity; the equivalent f-number of the aperture being 6 or greater.

Abstract: Based on a light-reception result of a light-receiving unit capable of receiving light on a document table and outputting the light-reception result, the end of a document placed on a document table is determined. In accordance with the condition of external light on the document table, the light-receiving unit is controlled so as to change a method of outputting the light-reception result from the light-receiving unit.

Abstract: A color processing apparatus includes a first subtracting unit, a second subtracting unit, and an output unit. The first subtracting unit subtracts color values of CMY color signals corresponding to an achromatic color value from color values of input CMY color signals in accordance with replacement to the achromatic color value. The second subtracting unit subtracts color values of CMY color signals corresponding to a color value of an additional color signal different from the CMY color signals from the color values of the CMY color signals after the subtraction by the first subtracting unit in accordance with replacement to the color value of the additional color signal. The output unit multiplies the color values of the CMY color signals after the subtraction by the second subtracting unit and the color value of the additional color signal by N (N>1) and subsequently outputs the color signals.

Abstract: An image scanner includes: a document table; a document cover; a light source; an image sensor; and a circuit configured to: acquire, as pre-reading black data, the line data that is generated by the image sensor in a state where the light source is turned off; after acquiring the pre-reading black data, acquire, as line image data, the line data that is generated by the image sensor in a state where light is emitted from the light source to an original document supported on the document table; after acquiring the line image data, acquire, as post-reading black data, the line data that is generated by the image sensor in a state where the light source is turned off; determine black reference data based on the post-reading black data and the pre-reading black data; and perform black correction on the line image data based on the black reference data.

Abstract: Provided is an image forming apparatus capable of improving the convenience of standard functions that are used often. A storage unit stores correlated-operation information, in which correlated operations that are correlated with a document-placement plate and the contact glass respectively as document placement locations, is registered for each user. A correlated-operation-executing unit references correlated-operation information of a user authenticated by a user-authenticating unit. The correlated-operation-executing unit executes a correlated operation correlated with placement of a document on the document-placement plate when a placement-detecting sensor detects placement of a document on the document-placement plate. The correlated-operation-executing unit executes a correlated operation correlated with placement of a document on the contact glass when an open/closed-detecting sensor detects opening/closing of a pressure plate.

Abstract: An image forming apparatus includes an image forming section for forming an image on a transfer medium, a conveyance section for conveying the transfer medium, and a control section for controlling image formation and conveyance. The control section is capable of acquiring an image reading result for a transfer medium on which an image is formed and determining whether the transfer medium is faulty, and, if the transfer medium is determined to be faulty and there are a plurality of output destinations for faulty transfer media which are the transfer medium determined to be faulty and transfer media having already been fed after the transfer medium determined to be faulty, gives a warning about removal of the faulty transfer media for each output destination.

Abstract: An illumination device includes a light guide member having a bar-like shape and a light source disposed so as to face an end surface of the light guide member. The illumination device guides light from the light source in the light guide member and emits the light from a light emission surface of the light guide member formed in a longitudinal direction of the light guide member. The light emission surface includes a first light diffusing portion that is formed in a first portion near the light source and that has a protruding/recessed shape, and a second light diffusing portion that is formed in a second portion adjacent to an end of the first light diffusing portion, the end being away from the light source. The second light diffusing portion has a protruding/recessed shape and has lower light diffusivity than the first light diffusing portion.

Abstract: There is provided an image reading apparatus including: a reading unit that reads a document; a document transport unit that transports the document toward the reading unit; a binding member detector that detects a binding member binding the document by detecting a change in a magnetic field when the document passes through the magnetic field; a document detector that detects passage of the document when the document passes through the binding member detector; and a controller that receives information on the document detected by the document detector and information on the change in the magnetic field detected by the binding member detector, in which in a case where the binding member detector detects the change in the magnetic field in a document undetected state in which the document detector does not detect the passage of the document, the controller executes a predetermined process.