An image reading apparatus according to an embodiment of the present invention includes: an image sensor to read a document; a movement unit configured to relatively move the document and the image sensor by using a motor as a drive source; an output unit configured to output data of a plurality of colors based on accumulated light-receiving signals by accumulating the light-receiving signals from the image sensor for each color in order for each line in a direction of the movement based on an encoder pulse output from an encoder in accordance with rotation of the motor; and a correction unit configured to perform shading correction for each piece of data of the plurality of colors output by the output unit by using a correction value to correct influence on data of the plurality of colors due to a dark current in the image sensor based on shading data.

A method of performing error notification and error recovery functions in an image forming apparatus includes detecting by one or more sub-processors an error of a main processor for controlling the sub-processors; controlling an interface function of the image forming apparatus if the error is detected; outputting information about the detected error; and recovering the detected error by controlling an operation of the main processor.

Then image reading device includes a transparent document table, a frame, a reading unit, a moving mechanism, a white reference member, and a controller. The frame is provided around a peripheral of the document table. The white reference member is provided on the frame adjacent to the document table in the sub scanning direction and has a length in the main scanning direction longer than the document table. The reading unit includes a first reading part which reads an area corresponding to the document table and a second reading part which reads an area corresponding to the frame. The controller detects a boundary between the frame and the reference member based on a read value of the second reading part while moving the reading unit by the moving mechanism, and positions the reading unit at a home position apart from the boundary by a predetermined distance.

In a case where it is determined that a document is left behind, a display control unit is configured to control display of an icon using a result of detection by a second detection unit without using at least a result of detection by a first detection unit.

An original image is read as an aggregate of a plurality of pixels in which adjacent pixels have different colors (R, G, and B) in a main scanning direction and in a sub-scanning direction, and the read pixels of the respective colors are stored in a line memory in association with information on relative positions of the pixels with respect to another pixel. Then, the stored pixels are sorted so that pixels having the same color are adjacent to each other, and an abnormal pixel (dust) not present in the original image is detected based on the state of the sorted pixels. With this, the dust not present in the original image is detected without increasing the cost, and the dust is corrected without forming a conspicuous trace of correction.

An information processing system includes a reading device configured to perform reading processing for reading an original, and one or more controllers configured to function as an acquisition unit that acquires a number of processing operations per unit time period of the reading processing, and an acquisition unit that acquires operation rate information about the reading device based on the number of processing operations per unit time period of the reading processing and a predetermined number of processing operations of the reading processing.

An image reading apparatus according to the present disclosure includes a platen glass, an image reader, and an output interface. An original is placed on the platen glass. The image reader is configured to read an image of the original on the platen glass. The image reader includes at least one sensor configured to detect a quantity of light for each of a plurality of regions on the platen glass. The output interface is configured to output information which identifies one or more regions of the plurality of regions in which the quantity of light detected therefrom exceeds a given value.

Provided is an image-forming device that can execute operations that do not use a document-reading unit even when abnormality in a light source is detected in the initial operation at startup. The image-forming device includes a document-reading unit, and together with being able to execute image-forming operations that use the document-reading unit, is able to execute image-forming operations that do not use the document-reading unit. The image-forming device includes a light-source-abnormality-detection unit that executes a light-source-abnormality-detection operation, and when an abnormality in the light source is detected by the light-source-abnormality-detection operation that is executed at startup, stores the startup signal level that is outputted in a light-source-abnormality-storage unit as light-source-abnormality information. The image-forming device performs normal startup in which all image-forming operations can be executed regardless of the detection results of the light-source-abnormality-detection operation.

An image reading apparatus, having a placement table, a reader to read an image recorded on the recordable medium placed on the placement table while moving in one direction, a memory storing information concerning a test pattern, and a controller, is provided. The controller is configured to, when instructed to read the test pattern, control the reader to stop reading to pause before reading the test pattern completely, while the reader pauses, based on read data generated from an outcome of reading of the test pattern so far and the information concerning the test pattern, determine whether the read data satisfies a predetermined condition, and when the read data satisfies the predetermined condition, control the reader to resume reading the test pattern, but when the read data does not satisfy the predetermined condition, control the reader to abort reading the test pattern and output an error alerting signal.

An illumination apparatus includes a light source and an elongated light guide, wherein the light guide includes an emission surface that emits light from the light source and a reflection surface that reflects the light to the emission surface, the reflection surface includes a plurality of diffusion portions that diffuse the light, the diffusion portions have a shape of part of a sphere recessed from the reflection surface, a depth of the diffusion portions from the reflection surface is equal to or greater than 16.5% and equal to or smaller than 50% of a diameter of the sphere, and a width of the diffusion portions is equal to or greater than 0.1 mm and equal to or smaller than 50% of a width of the reflection surface.