Abstract: Provided is a method and a device for detecting open and closed states of a platen cover plate of an image reading apparatus. The method includes: controlling a scanning element to scan light at an edge of a platen to obtain a signal value representing a light intensity; determining whether an absolute difference value between the signal value and a preset standard value is greater than a preset tolerance value; sending a prompt signal to prompt a user to close the platen cover plate in response to the absolute difference value being greater than the preset tolerance value; and continuing to perform scanning work on a manuscript on the platen in response to the absolute difference value being not greater than the preset tolerance value. The influence on quality of the scanned image due to incomplete closing of the platen cover plate is prevented.

Abstract: There is provided an image reading device in which a controller is configured to perform detecting, by executing an edge detection process, edge pixels from image data scanned by a reading device and stored in a storage, the edge pixels being pixels obtained by reading an edge of an original document. Then, it is determined whether a sequence of the detected edge pixels in a particular direction is interrupted. When interrupted, an expansion process is executed to increase the edge pixels in a particular range in a neighborhood of the detected edge pixels of the image data. Then, a particular process is performed on the image data using the edge pixels detected from the image data after the edge pixels are increased.

Abstract: An image processing apparatus includes a selection unit, a determination unit, and a control unit to set candidates to be selected by the selection unit. If determination unit determines that there is not a set of a size and an orientation of a document of which the orientation cannot be correctly determined, the control unit sets, as selection unit selection candidates, candidates of sets of sizes and orientations of a plurality of documents. If the determination unit determines that there is a set of a size and an orientation of a document of which the orientation cannot be correctly determined, the control unit sets, as selection unit selection candidates, candidates obtained by excluding the set of the size and the orientation of the document of which the orientation cannot be correctly determined from the candidates of the sets of the sizes and the orientations of the plurality of documents.

Abstract: In an image reading device including a document platen, a document holder, multiple light sources, and a close contact type image sensor, the light sources are sequentially turned on and the image sensor individually reads light of multiple different colors reflected from a document in a main scanning direction. When the document holder is opened, in an area determination process, a first scanning area where a difference between output values of the image sensor when the light sources are sequentially turned on is within a predetermined threshold value range, and a second scanning area where the difference is outside the predetermined threshold value range are determined in an entire scanning area of the image sensor. A document size in the main scanning direction is detected based on a position of a boundary in the main scanning direction between the first and second scanning areas determined in the area determination process.

Abstract: An image forming apparatus includes a mounting table on which an object whose image is to be scanned is mounted; an image forming section that forms an image, which includes a first image for measuring a relative position with respect to an end portion of a paper, on a first side of the paper; an image scanning section that scans the image mounted on the mounting table; and a position correction section that corrects a relative position of an image, which is formed on the paper, with respect to the paper based on a result of scanning performed by the image scanning section, in which in a case where the image scanning section scans the end portion of the paper and the image formed on the first side of the paper in a state in which the first side of the paper on which the first image is formed faces the mounting table, the end portion of the paper is mounted on the mounting table at a position separated from an end portion of the mounting table, and, further, the paper is covered with a cover paper, and the ima

Abstract: An image forming apparatus includes an original reading unit; an image forming unit, an image data sending unit; and a mode setting unit for setting one of original reading modes including a first original reading mode for the original reading unit to read originals of the same size, and a second original reading mode for the original reading unit to read originals of different sizes; and a control unit for controlling the original reading unit and the image forming unit so as to execute a copy job including the original reading process and the image forming process, and a sending job including the original reading process and the sending process. The mode setting unit is capable of independently setting, for the copy job and the sending job, a default value indicating the first original reading mode or the second original reading mode.

Abstract: An image processing device includes: an estimated size setting section (ACS determination section 151) which sets a document size of a document sheet as an estimated size; a threshold deciding section (ACS determination section 151) which decides a first threshold according to the estimated size; and an ACS determination section (151) which determines that the document sheet is a color document sheet when a number of color pixels reaches the first threshold. When an actual size of the document sheet is smaller than the estimated size, the threshold deciding section decides a second threshold which is smaller than the first threshold, and the document sheet is determined to be a color document sheet when the number of color pixels is the second threshold or greater and is determined to be a black-and-white document sheet when the number of color pixels is smaller than the second threshold.

Abstract: According to various embodiments, an image processing device may be provided. The image processing device may include: an input circuit configured to receive display data; a splitting circuit configured to split the display data into a first output and a second output; a first output circuit configured to output the first output for displaying with a first spatial resolution; and a second output circuit configured to output the second output for displaying with a second spatial resolution.

Abstract: An image scanning unit optically scans an image of a predetermined scanning area that includes a platen glass on which a document is put. A document cover is capable of rotation and covers the platen glass. A first movable member moves in a direction substantially perpendicular to the platen glass in accordance with opening and closing of the document cover. A second movable member moves in a direction substantially parallel to the platen glass in accordance with movement of the first movable member when the first movable member contacts. A cover status detecting unit obtains the image from the image scanning unit and detects a status of the document cover on the basis of an image of the second movable member in the scanning area.

Abstract: An image reading apparatus including: an angle detector configured to detect a first state in which a pressure plate is at a first angle with respect to a transparent member and a second state in which the pressure plate is at a second angle smaller than the first angle; a size determiner configured to determine a size of the original in a main scanning direction based on a reading result of a reader; and a controller configured to switch a first size determination mode in which a light source is turned on when a waiting state in which an angle of the pressure plate is larger than the first angle is changed to the first state, and a second size determination mode in which the light source is tuned on when the first state is changed to the second state.

Abstract: An image reading apparatus includes: a reading unit, which is configured to read an original placed on an original table in a main scanning direction by irradiating the original with light; and a sub-scanning size detector, which is configured to detect presence or absence of the original on the original table by radiating invisible rays. When the platen cover forms an angle of equal to or smaller than a first angle with respect to the original table, the image reading apparatus determines a size of the original in a sub-scanning direction in accordance with a detection result acquired from the sub-scanning size detector. When the platen cover forms an angle equal to or smaller than a second angle, which is smaller than the first angle, with respect to the original table, the image reading apparatus determines a size of the original in the main scanning direction.

Abstract: A medium transport apparatus includes: a feed unit feeds a medium to a transport direction; a first detection unit disposed upstream of the feed unit, and detects movement of the fed medium; a second detection unit disposed downstream of the first detection unit and detects an inclination of the medium; and a control unit detects the inclination of the medium based on a signal of the second detection unit and stop transfer of the medium when the inclination exceeds a threshold value, and the plurality of the threshold values have a relationship such that when a medium length in the transport direction is a second length being shorter than a first length, a relatively higher value is produced than in a case in which the medium length is the first length, and the control unit selects a threshold value based on a detection value of the first detection unit.

Abstract: A program causes, when executed, a terminal apparatus to perform operations including: receiving a target signal from a target scanner, the target signal being sequentially transmitted from the target scanner after a placement operation of placing an original document of a scan target is performed at the target scanner, the target signal not being transmitted from the target scanner before the placement operation is performed at the target scanner; in response to receiving the target signal from the target scanner, acquiring target communication information for performing wireless communication between the terminal apparatus and the target scanner through a target network; in response to acquiring the target communication information, transmitting a scan request to the target scanner through the target network by using the target communication information; and in response to transmitting the scan request to the target scanner, receiving scan data from the target scanner through the target network.

Abstract: A multiple-column-per-channel image CCD sensor utilizes a multiple-column-per-channel readout circuit including connected transfer gates that alternately transfer pixel data (charges) from a group of adjacent pixel columns to a shared output circuit at high speed with low noise. Charges transferred along the adjacent pixel columns at a line clock rate are alternately passed by the transfer gates to a summing gate that is operated at multiple times the line clock rate to pass the image charges to the shared output circuit. A symmetrical fork-shaped diffusion is utilized in one embodiment to merge the image charges from the group of related pixel columns. A method of driving the multiple-column-per-channel CCD sensor with line clock synchronization is also described. A method of inspecting a sample using the multiple-column-per-channel CCD sensor is also described.

Abstract: An image reading apparatus compares a difference in luminance value between a pixel of interest in image information acquired via a reading unit and a pixel separated from the pixel of interest by a first distance with a first threshold value. Further, the image reading apparatus compares a difference in luminance value between the pixel of interest and a pixel present within a range to a pixel separated from the pixel of interest by a second distance that is larger than the first distance with a second threshold value. The image reading apparatus determines whether or not the pixel of interest is an edge pixel at an original end portion based on results of those comparisons, and determines an original size based on a result of the determination.

Abstract: An image reading apparatus includes a document sheet table, an image reading portion, a detection processing portion, and a determination processing portion. A document sheet is placed on the document sheet table. The image reading portion reads linear image data representing an image of a linear area that extends along a main scanning direction of the document sheet that is placed on the document sheet table. The detection processing portion detects, based on the linear image data, a size of the document sheet in the main scanning direction. The determination processing portion determines, when the size of the document sheet in the main scanning direction detected by the detection processing portion meets a specific condition, that the document sheet is a predetermined card-shaped document sheet.

Abstract: In an example, an apparatus is described that includes a transparent platen, a substrate, an array of light sources, and a sensor. The substrate is positioned on one side of the platen and has substantially uniform reflective properties. The array of light sources is positioned on an opposite side of the platen from the substrate and includes a plurality of light sources that emits light in a visible spectrum and a light source that emits light in an invisible spectrum. The sensor is positioned on the opposite side of the platen from the substrate and detects reflected portions of the light in the visible spectrum and the light in the invisible spectrum.

Abstract: Conventionally a user who owns images exceeding the upper limit of the number of analyzable images cannot perform automatic album creation. To solve this problem, an embodiment of this invention selects images from obtained images, in a first case where the number of the obtained images is more than a predetermined threshold, according to a predetermined condition so as to make the number of selected images equal to a predetermined threshold. In the first case, the number of selected images are analyzed. In a second case where the number of the obtained images is not more than the predetermined threshold, the obtained images are analyzed. Images among the selected images are laid out based on the analysis in the first case, and images among the obtained images are laid out based on the analysis in the second case.

Abstract: An image reading device including a contact glass; a reading unit; a pressure plate; a pressure-plate opening/closing sensor; and circuitry. The circuitry determines a presence or absence of external light input to a space between the pressure plate and the surface of the contact glass based on image data obtained by the reading unit when the light source is turned off; compares read data according to light emitted from the light source and received by the image sensor when the pressure plate is closed, with read data of a reference value obtained when the pressure plate is completely closed, to obtain a difference and determine a state of the read data based on the difference; and determines whether the pressure plate is open or closed based on a determination result of the presence or absence of external light and on the difference.

Abstract: An image reading apparatus includes a reading unit, which includes an illumination portion for irradiating an original placed on an original table with light and a light receiving portion for receiving irradiated light reflected from the original. The image reading apparatus reads the original one line at a time in a main scanning direction according to the received reflected light. The image reading apparatus determines the size of the original based on the reading result of the reading unit. The image reading apparatus shortens, in a case where the platen cover is in an open state, the lighting duration of the illumination portion than the duration where the platen cover is in a close state.

Abstract: A printing apparatus includes a sheet holding unit, a printing unit, a storage unit, and a control unit. The printing unit prints an image on types of sheets supplied from the sheet holding unit. The storage unit stores first information indicating a type of sheet placed on the sheet holding unit and second information indicating whether predetermined setting for allowing omission of selection of a sheet type is performed. When the second information indicates that the predetermined setting is performed, a printing operation is executed according to sheet type designated for the first print job. When the second information indicates that the predetermined setting is not performed, a printing operation corresponding to the same sheet type is executed. Where execution of a second print job in which a sheet type is not designated is instructed, a printing operation corresponding to the sheet type indicated by the first information is executed.

Abstract: An image display apparatus according to an embodiment of the present technology includes an image display unit, a calculator, and a notification section. The image display unit includes an emission surface and displays an image by emitting light from the emission surface. The calculator calculates a reference distance from the emission surface, the reference distance serving as a determination criteria for an influence of emitted light that is emitted from the image projection section. The notification section notifies about information on the influence of the emitted light on the basis of the calculated reference distance.

Abstract: An image reading apparatus, having a conveyer, a sheet tray, an obtaining device, a memory, a determining device, and a controller, is provided. The controller determines whether information concerning pixels in the memory indicates edge positions or edge absence in in read-image data concerning a sheet, detects an upstream leading-end position and a downstream leading-end position, detects upstream continuing pixels and downstream continuing pixels, detects an upstream lateral-end position and a downstream lateral-end position, calculates a line representing an upper end of the sheet based on the upstream leading-end position and the downstream leading-end position, calculates an upstream corner position and a downstream corner position based on the upstream and downstream lateral-end positions and the line representing the upper end of the sheet, and calculates a width of the sheet based on the upstream corner position and the downstream corner position.

Abstract: Methods, apparatus, systems and articles of manufacture are disclosed for providing print dimensions from a printer. An example method includes analyzing a first roll of a printer, the first roll holding first paper having a first width; determining, via a processor of the printer, a first print dimension of the first paper on the first roll based on the first width; and providing the first print dimension to an electronic device, the electronic device to use the first print dimension to determine whether content is to be clipped when printed on the first paper.

Abstract: An image reading apparatus 300 comprises: the scanner device SD which reads information about a sheet P conveyed on a paper conveying route PP and information about a position, a form and a color of an image formed on the sheet P; a spectrophotometer CI which reads information about a color of an image formed on a sheet P conveyed on the paper conveying route PP; and a support base TR which incorporates the paper conveying route and a motor for conveying a sheet and can be pulled out from a main body together with the paper conveying route and the motor. The scanner device SD is not mounted on the support base TR but fixed to the main body of the image reading apparatus. The spectrophotometer CI is mounted on and fixed to the support base TR, and spaced from the paper transfer route PP by a predetermined distance.

Abstract: According to one embodiment, there is provided an image processing apparatus including a reading unit and a determining unit. The reading unit generates sheet image data indicating image data of a sheet. The determining unit determines, on the basis of a degree of gradation in the sheet image data generated by the reading unit, whether a planar object adheres on the sheet read by the reading unit.

Abstract: An image scanning apparatus performs operations including: upon detection of a first angle, causing light to be emitted to an original and recording a distribution of reflected light of the emitted light as first read data; upon elapse of a predetermined time from detection of a second angle, causing light to be emitted to the original and recording a distribution of reflected light of the emitted light as second read data; detecting a closed state of a pressure plate based on the second read data; and upon determination of an angle of the pressure plate with respect to the platen being equal to or smaller than a third angle smaller than the second angle in the detection of the closed state, detecting a width of the original in an opening-closing direction of the pressure plate based on a difference between the first and second read data.

Abstract: An image reading device includes a controller that performs control, when a document size is to be determined, so as to reduce a light amount irradiated by a light source more than that in a case of image reading; a period extending unit that extends, when the document size is to be determined, a period in which an image sensor performs photoelectric conversion in a main scanning direction longer than that in a case of image reading; an averaging unit that averages, when the document size is to be determined, results obtained when a plurality of predetermined pixels perform the photoelectric conversion; and a determining unit that determines the document size according to a result averaged by the averaging unit in a period extended by the period extending unit.

Abstract: An image reader of the present disclosure includes a contact glass, an automatic document feeder, a first reading module, and a second reading module. The first and second reading modules each acquire black reference data through reading performed by a sensor with a light source turned off, and acquires white reference data through reading performed by the sensor at a position facing a white reference plate with the light source turned on. In a case of performing continuous one-side reading by means of the first reading module, based on a sensor output value of the second reading module in the continuous one-side reading, it is determined whether it is necessary for the first reading module to reacquire the black reference data or the white reference data.

Abstract: A page-turning device for turning a page of an opened book, page-turning device including an adhesive part which adheres to the page of the book; an arm part with the adhesive part provided on a top end, the arm part making the adhesive part go to and fro between a departure position and a destination position such that the adhesive part adheres to the page at the departure position and separates from the page at the destination position; and a drive unit which rotates the adhesive part in relation to the arm part. The drive unit rotates the adhesive part before the adhesive part reaches the destination position so that an adhering portion of the adhesive part is changed, and stops rotation of the adhesive part when the adhesive part adheres to the page.

Abstract: Systems and methods for manipulating data records in a byte accessible format are provided. Records may be loaded into one of two byte accessible files or arrays, with a determined record length added to the beginning and/or end of each record. Records may then be slewed between the two files and records added, removed, or modified at the split between the two files.

Abstract: An image processing device that changes the output format of the generated printout can dynamically change the output format of the printout using print data from an existing system. An image processing device that executes a process to change the output format of a printout has an output format selector that selects a template determining the format of the printout based on information contained in the print data for the printout, and a print data generator that changes the print data according to the selected template.

Abstract: A paper type detection apparatus includes a surface-property detection unit, a thickness detection unit, and a paper-type setting unit. The surface-property detection unit detects a surface property of paper by performing image processing on image data of the paper read by an image reading unit. The thickness detection unit causes the image reading unit to read the image data of the paper over which a reference chart with a predetermined black density is laid. The thickness detection unit detects the thickness of the paper based on the difference between the black density of the reference chart and the black density appearing on the image data through the paper. The paper-type setting unit sets the type of the paper associated with the detected surface property and thickness of the paper.

Abstract: A display method for displaying a schedule screen which indicates an execution reservation state of JOBS on a display section, the method including the step of displaying a part or the whole of information concerning two or more of the JOBs, by superimposing on the schedule screen, according to a display condition; and displaying, in cases where information which is required to be recognized by a user exists in the information displayed by superimposing, the information required to be recognized by the user on an uppermost layer to be visible.

Abstract: A scanner identifies a document size on the basis of the intensity of light outputted in a photometric condition different from a first photometric condition, by photometric units provided to a position subject to determination that is a position excluding a position where light of an intensity not less than a first threshold value is received in the first photometric condition, among a plurality of positions to which the photometric units are provided. The first photometric condition is a condition where a document cover is open and a light-emitting unit is not emitting light.

Abstract: A synchronized video monitoring system may include a plurality of separate sensor modules that each include a lens assembly, an image sensor, and a sensor controller. Each sensor module may be connected to a data bus. A collection module that includes a digital image compressor engine may also be connected to the data bus. Each sensor module may capture an image of a field of view of a monitored area. Each sensor module may insert its image data onto the data bus within a different allotment of time within a frame capture cycle. The collection module may compress and encode the image data received from each sensor module, and may generate a composite video image frame. Each region of the composite video image frame may depict image data captured by a different sensor module.

Abstract: An image reading device includes a blank elimination processing portion that performs blank elimination processing for eliminating image data of an original document if a preset blank detection area in the original document is blank and a frame erasure processing portion that performs frame erasure processing for correcting image data of an original document so that any image in an area other than a preset effective image area in the original document does not appear. The blank elimination processing portion performs resetting in which a superimposition area where the preset blank detection area and the preset effective image area are superimposed on each other is set as a new blank detection area.

Abstract: Provided are an image processing apparatus, an image processing method, a computer-readable medium storing a computer program and an image processing system cropping a document image from image data including a document region having a tab. The image processing apparatus includes a line determination unit for determining a line extending the boundary of the document region in the tab portion and a line extending the boundary of the document region in the non-tab portion, respectively, a selector for selecting, in accordance with the setting designating the outside or the inside of the document region, one line either in the outside or in the inside from the among lines determined by the line determination unit, and an image cropper for cropping an image of the document region with the selected line as a boundary line.

Abstract: A sheet conveyance device is capable of detecting a sheet length in a conveyance direction correctly, and of detecting a length of a non-standard size sheet correctly. A detection unit detects front and rear ends of a sheet conveyed with a conveyance unit. A measurement unit measures sheet length in a conveyance direction based on a detection result of the detection unit. An acquisition unit acquires a reference length of the sheet. A computation unit computes a correction value that is used to correct a length measured by the measurement unit based on length measured and the reference length acquired in a correction mode. A storage unit stores the correction value computed. A determination unit determines sheet length corrected based on the correction value and the length measured at the time of conveyance of a sheet in a mode other than correction mode.

Abstract: There is provided a document, wherein a measurement image for measuring a position of an image relative to a document is formed on a first surface thereof, a designation image for designating a document position, at which the document is placed on an image reading apparatus that reads an image, is formed on a second surface thereof, and wherein the document is spaced from an end portion of a reading region of the image reading apparatus by placing the document in accordance with the designation of the designation image, and the designation image is formed such that the measurement image is placed in the reading region of the image reading apparatus.

Abstract: A document reading unit included in an image forming apparatus and operated with a method of detecting an original document, includes an original document table, a moving irradiation unit having multiple block light sources moving in a sub scanning direction while irradiating the original document, an image sensor receiving reflected light, and a controller that starts a length specifying operation with the moving irradiation unit located at a position facing the original document, sequentially turns on the block light sources, obtains an amount of reflected light under lighting conditions of each block light sources, and determines the length of the original document in the main scanning direction. While the moving irradiation unit is moving in the sub scanning direction, the image sensor receives the reflected light on a region of the original document in the sub scanning direction under each lighting condition during the length specifying operation.

Abstract: An image processing apparatus operative to properly obtain an original area when one or a plurality of originals exists. The image processing apparatus decides an image data area of an original from read image data read thereby. The image processing apparatus has an extracting unit for extracting a plurality of image areas from the read image data and a discriminating unit for discriminating whether or not tilt angles of the image areas extracted by the extracting unit are equal. If one or more tile angles of the image areas are not equal as a result of the discrimination by the discriminating unit, it is determined that each of the image areas is an image data area of the original on the assumption that there are a plurality of originals.

Abstract: According to one embodiment, a document detecting apparatus includes a light-emitting element, a photoelectric conversion element, a light-emission controller and a detection processor. The light-emitting element projects light onto a detection position of a document. The light-emitting element is not used for reading an image of the document. The photoelectric conversion element converts light projected onto the detection position into an electric signal and outputs the electric signal. The light-emission controller changes the light quantity of the light emitted by the light-emitting element during a predetermined interval. The detection processor detects the presence or absence of the document at the detection position of the document based on whether a value of the output electric signal during the predetermined interval changes in correspondence to the change of the light quantity caused by the light-emission controller.

Abstract: The invention relates to an apparatus and a method for processing value documents. A value document is input to the input opening of an apparatus for value-document processing and transported using a transport system of the apparatus to an image sensor which senses a partial image of the value document. A contour of the front partial area is ascertained from the sensed partial image and checked. If the check of the contour of the front partial area yields a fault, the value document is rejected. Faulty or faultily transported value documents can thus be recognized and transported back to the input opening at a very early time.

Abstract: A scanner identifies a document size on the basis of the intensity of light outputted in a photometric condition different from a first photometric condition, by photometric units provided to a position subject to determination that is a position excluding a position where light of an intensity not less than a first threshold value is received in the first photometric condition, among a plurality of positions to which the photometric units are provided. The first photometric condition is a condition where a document cover is open and a light-emitting unit is not emitting light.

Abstract: A scanner for automatically detecting a scan target includes a transparent scan region configured to support the target, an image sensor including a light source for irradiating light toward the scan region and a light receiving element array for sensing the incident light through the scan region, a drive unit configured to linearly move the sensor across the scan region, and a control unit that controls the sensor and the drive unit. The control unit controls the light source of the sensor and the drive unit such that the sensor moves to a detection position and then the array senses the incident light through the scan region with the light source turned on and off. The control unit compares output signals of the array obtained by turning on and off the light source and automatically determines, based on the comparison, whether the target is placed in the scan region.

Abstract: The disclosure provides a printing control method, a printing control device and a printing device with printing data printed according to height of another blank space. The printing control method comprises the following steps: receiving printing data; acquiring first printing format information of the printing data, wherein the first printing format information includes a first blank space height; acquiring paper-saving parameter information; obtaining second printing format information according to the first printing format information and the paper-saving parameter information, wherein the second printing format information includes a second blank space height; and printing the printing data according to the second blank space height. With the disclosure, a significant paper-saving effect can be achieved during printing.

Abstract: An image reading apparatus includes placement member, pressing member, and open/close detection portion. Open/close detection portion detects opening and closing of pressing member. Open/close detection portion includes movable portion, guide hole, and sensor. When pressing member is opened, movable portion moves toward one side, thereby protruding to an area between placement member and pressing member, and when pressing member is closed, movable portion moves toward the other side. Movable portion extends along movement direction thereof. Guide hole of movable portion guides movement of movable portion in movement direction. Movable portion has a plurality of groove portions extending in movement direction, and groove portions partially include guide groove. Guide hole has guide protrusion protruding from inner circumferential surface thereof toward groove portion of movable portion, so as to guide movement of movable portion.

Abstract: An image reading device includes a platen glass, a document feeder, a light source, a light receiving section, a first opening/closing detection sensor, a second opening/closing detection sensor, and a document size determination section. The document size determination section determines a size of an original document on the basis of a measurement result from the light receiving section. Where the first opening/closing detection sensor indicates the open state, while the second opening/closing detection sensor indicates no open state when the original document is placed on the platen glass, the document size determination section determines a size of the original document in a main scanning direction on the basis of full lighting-up determination data obtained with all of plural light emitting elements lighted up and partial lighting-up determination data obtained with some of the plural light emitting elements lighted up.

Abstract: An image reading apparatus includes a carriage, a carriage detector, and a control unit. The carriage detector outputs a detection signal of the carriage when the carriage is at the home position, and outputs a non-detection signal of the carriage when the carriage is located closer to a document size reading position than a predetermined position between the home position and the document size reading position. The control unit moves the carriage to the home position when the image reading apparatus enters a sleep mode, keeps the carriage detained while performing initialization after the sleep mode is cancelled, and moves the carriage, upon receipt of a scanning instruction after the initialization is completed, toward the document size reading position in the case where the carriage detector outputs the detection signal of the carriage.