JP2019062274A - Image reading device and image formation device - Google Patents

Abstract

To provide an image reading device capable of realizing energy saving and reading an image corresponding to a user's demand.SOLUTION: An image reading device 14 comprises a change value derivation unit 27 and a timing determination unit 28. The change value derivation unit 27 derives a change value being a value of change in data of a corrected value obtained when a correction unit 25 performs shading correction and data of a correction value of the last time stored in a storage unit 17. The timing determination unit 28 determines timing to perform the next shading correction by a correction unit 25 on the basis of the change value derived by the change value derivation unit 27.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an image reading apparatus and an image forming apparatus.

  In an image forming apparatus typified by a multifunction machine, after an image of a document is read by an image reading unit, light is irradiated to a photosensitive member provided in the image forming unit based on the read image, and the image is read onto the photosensitive member. Form an electrostatic latent image. Thereafter, charged toner is supplied onto the formed electrostatic latent image to form a visible image, and then the toner is transferred and fixed to a sheet, and the sheet is output to the outside of the apparatus.

  Here, techniques related to correction of image reading are disclosed in Japanese Patent Application Laid-Open Nos. 2001-211298 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2013-165425 (Patent Document 2).

  Patent Document 1 includes an image scanning unit that scans and reads an original image, a correction unit that corrects the document image data read by the image scanning unit, a clock unit that measures the lapse of a predetermined time, and the clocking unit. The first reference image data is generated by causing the image scanning means to scan the first reference member when the means does not measure the lapse of the predetermined time, and the timekeeping means measures the lapse of the predetermined time. The second reference member is scanned by the image scanning unit to generate second reference image data, and the correction unit is configured to correct the document image data based on the generated first or second reference image data. An image forming apparatus is disclosed, comprising: control means for controlling the image forming apparatus.

  Further, in Patent Document 2, a transport unit for transporting a document, a reading unit for reading the transported document in a transport reading area, a white reference plate disposed at a readable position of the reading unit, and the white An image comprising: control means for reading the reference plate to acquire white reference data and controlling the transport means and the reading means to acquire black reference data at a frequency more frequently than acquisition of the white reference data A reader is disclosed.

JP 2001-211298 A JP, 2013-165425, A

  When an image is read, shading correction may be performed in which correction is performed based on the amount of light emitted to the document. The shading correction needs to be performed at an appropriate timing from the viewpoint of reading a high quality image. The technique disclosed in Patent Document 1 can not perform appropriate shading correction because it is handled by a service person. According to the technique disclosed in Patent Document 2, the white reference plate can not be read at an appropriate timing according to the state of the image reading process, and even in Patent Document 2, there is a possibility that appropriate shading correction can not be performed. In addition, reduction of energy required for shading correction is also required, and reading of an image with as high quality as possible based on appropriate shading correction is also desired from the user.

  An object of the present invention is to provide an image reading apparatus capable of realizing energy saving and capable of reading an image according to a user's request.

  Another object of the present invention is to provide an image forming apparatus capable of realizing energy saving and capable of forming an image according to the user's request.

  In one aspect of the present invention, the image reading apparatus reads an image of a document. The image reading apparatus includes a light irradiation unit, an image reading unit, a white reference unit, a correction unit, a storage unit, a storage control unit, a change value deriving unit, and a timing determination unit. The light irradiator irradiates light to an original for reading an image. The image reading unit reads an image of a document from reflected light from the document. The white reference portion is white, and is provided at a position where the light irradiation portion can emit light. When the predetermined timing is reached, the correction unit performs the shading correction based on the reflected light of the light irradiated by the light irradiation unit reflected by the white reference unit. The storage unit stores data. The storage control unit performs control to store data of the correction value corrected by the correction unit in the storage unit. The change value deriving unit derives a change value which is a value of a change between data of the correction value obtained when the shading correction is performed by the correction unit and data of the previous correction value stored in the storage unit. The timing determination unit determines, based on the change value derived by the change value derivation unit, the timing at which shading correction is to be performed by the next correction unit.

  In another aspect of the present invention, an image forming apparatus includes the above-described image reading apparatus, and an image forming unit that forms an image based on an image of a document read by the image reading apparatus.

  According to such an image reading apparatus, the timing determination unit determines the timing of performing the shading correction by the next correction unit based on the change value derived by the change value derivation unit. Then, for example, when the change value is small, the frequency of performing the shading correction can be reduced, and energy saving can be realized. In this case, since the degree of change between the correction data of the shading correction and the previous correction data is small, the image quality at the time of reading the image can be maintained high to some extent. Therefore, such an image reading apparatus can realize energy saving, and can read an image according to the user's request.

  Further, according to such an image forming apparatus, energy saving can be realized, and image formation can be performed according to the user's request.

FIG. 1 is an external view of a multifunction peripheral when an image forming apparatus including an image reading apparatus according to an embodiment of the present invention is applied to a multifunction peripheral. FIG. 2 is a block diagram showing the configuration of a multifunction peripheral shown in FIG. FIG. 2 is a schematic cross-sectional view showing a part of an image reading apparatus including an ADF. It is a block diagram showing composition of a control part. It is a flow chart which shows a flow of processing at the time of performing shading amendment. FIG. 14 is a block diagram showing a configuration of a control unit provided in a multifunction peripheral as an image forming apparatus according to another embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described. In the following drawings, the same or corresponding parts have the same reference characters allotted and description thereof will not be repeated.

  FIG. 1 is an external view of a multifunction machine 11 when an image forming apparatus provided with an image reading apparatus according to an embodiment of the present invention is applied to a multifunction machine. FIG. 2 is a block diagram showing the configuration of the multifunction machine 11 shown in FIG. Referring to FIGS. 1 and 2, the multifunction peripheral 11 has a plurality of functions such as a copy function, a printer function, and a facsimile function, regarding image processing. The multifunction peripheral 11 is connected to the control unit 12, the operation unit 13, the image reading device 14, the image forming unit 15, the paper feed cassette 16, the hard disk 17 as a storage unit for storing data, and the network 23. And a network interface unit 18.

The control unit 12 controls the entire multifunction peripheral 11. Control unit 12 is configured of a CPU (Central Processing Unit) or the like, and includes a main storage memory 19 that temporarily stores data. The operation unit 13 includes a display screen 21 as a display unit for displaying information transmitted from the MFP 11 and input contents of the user. The image reading device 14 includes an ADF (Auto Document Feeder) 22 as a document conveying device that conveys the document set at the set position to the reading position. The image reading device 14 reads an image of a document set on the ADF 22 or a placement table 41 described later on which the document is placed. A plurality of paper feed cassettes 16 are provided, and a plurality of sheets of paper can be accommodated therein. The image forming unit 15 forms an image on a sheet conveyed from the sheet feeding cassette 16 based on image data of a document read by the image reading device 14 and image data transmitted via the network 23 and prints the sheet. Do. The hard disk 17 stores data related to image formation, such as transmitted image data and input image forming conditions. Incidentally, in the hard disk 17, the storage control unit 26 to be described later, the correction value data X ₀ when performing the previous shading correction are stored.

Next, the configuration of the image reading device 14 provided in the multifunction machine 11 will be described in more detail. FIG. 3 is a schematic cross-sectional view showing a part of the image reading device 14 including the ADF 22. As shown in FIG. Incidentally, the sub-scan direction in FIG. 3, is shown in the orientation or reverse orientation that indicated by the arrow D _1.

  First, the configuration of the ADF 22 included in the image reading device 14 will be described with reference to FIGS. 1 to 3. The ADF 22 separates an original setting table 32 for setting a plurality of originals 31 to be conveyed, a pick-up roller 33 for sequentially supplying the originals 31 set on the original setting table 32, and the originals 31 to be conveyed. The roller 34, transport rollers 36, 37, and 38 for transporting the document 31 to the reading position 35, a discharge roller 39 for discharging the document 31 read at the reading position 35, and the discharged document 31 are placed. And an output tray 40. The transport roller 38 is formed of a white member. The transport roller 38 is a white reference portion that is a white reference when performing shading correction of a CCD sensor 44 as an image reading unit described later. The conveyance roller 38 is provided at a position at which the light irradiation unit 43 described later can emit light.

Next, the configuration of the image reading device 14 including the ADF 22 will be described. Image reading apparatus 14 includes a mounting table 41 for placing the document 31 for reading an image, a carriage 42 which is movable in the sub-scanning direction indicated by the arrow D ₁ or the opposite direction, the document 31 on which the image is read A light irradiator 43 for irradiating light, a plurality of mirrors and lenses (not shown) for condensing light reflected from the document 31, and an image reading unit for reading an image of the document 31 from the light reflected from the document 31 As a CCD (Charge Coupled Device) sensor 44, a reference plate 45 indicating a reference position when placing the document 31 on the mounting table 41, and a transparent member provided beside the reference plate 45 And a glass plate 46. The CCD sensor 44 as an image sensor can receive the reflected light of the light emitted to the image of the document 31 by the light emitting unit 43.

  The mounting table 41 is a transparent plate on which the document 31 can be placed. As the mounting table 41, contact glass is used in this embodiment. The carriage 42 is provided with a light irradiator 43 that irradiates light from the lower region of the mounting table 41 upward. That is, the light emitting unit 43 moves in the sub scanning direction along with the movement of the carriage 42.

The light irradiation unit 43 is configured by arranging a plurality of so-called LEDs (Light Emitting Diodes) in the main scanning direction. At the time of image reading, the light emitting unit 43 applies light to the reading position 35 of the document 31 in the direction indicated by the arrow E ₁ in FIG. 3. Direction of the reflected light from the original 31 side for reflecting irradiated light is indicated by an arrow E ₂ in FIG. Reflected light traveling in the direction indicated by the arrow E ₂ is received by the CCD sensor 44 via the mirrors and lenses.

The carriage 42 moves in the sub scanning direction, specifically, in the direction of the arrow D ₁ when reading the image of the document 31 placed on the mounting table 41. The light irradiation unit 43 irradiates light toward the mounting table 41 while moving in the sub-scanning direction as the carriage 42 moves. Then, the reflected light reflected by the received light from the side of the mounting table 41, specifically, the side of the document 31 placed on the mounting table 41 is condensed by a plurality of mirrors and lenses. By inputting the condensed light into the CCD sensor 44, the image of the document 31 placed on the placement table 41 is read. Thus, so-called scanning of the image of the document 31 is performed, and the image of the document 31 is read. After the image of the document 31 is read, the image forming unit 15 forms an image based on the image data of the read document 31 and outputs the image on a sheet or the like.

  When the image of the document 31 conveyed by the ADF 22 is read, the carriage 42 is held at the position of the glass plate 46 in the sub scanning direction. Then, the image of the original 31 conveyed by the ADF 22 is read at the reading position 35.

  The image reading device 14 can read not only black and white originals but also color information in color originals. The reading of the image of the document 31 placed on the placement table 41 is performed after detection of pressing of the start key provided on the operation unit 13.

  Next, the configuration of the control unit 12 provided in the multifunction machine 11 will be described. FIG. 4 is a block diagram showing the configuration of the control unit 12. Referring to FIG. 4, control unit 12 includes a correction unit 25, a storage control unit 26, a change value deriving unit 27, and a timing determination unit 28. When the predetermined timing is reached, the correction unit 25 performs shading correction on the basis of the reflected light of the light irradiated by the light irradiation unit 43 reflected by the transport roller 38. The storage control unit 26 controls the hard disk 17 to store the data of the correction value corrected by the correction unit 25. The change value deriving unit 27 derives a change value which is a value of a change between the data of the correction value obtained when the shading correction is performed by the correction unit 25 and the data of the previous correction value stored in the hard disk 17. . The timing determination unit 28 determines, based on the change value derived by the change value derivation unit 27, the timing at which the shading correction by the next correction unit 25 is to be performed. Specifically, the timing determination unit 28 includes a determination unit 29 that determines whether the change value derived by the change value derivation unit 27 is within a predetermined range. If the determination unit 29 determines that the change value is within the predetermined range, the timing determination unit 28 determines the timing at which the correction unit 25 performs the shading correction at the first time interval longer than the predetermined time interval. . Further, when the determination unit 29 determines that the change value is out of the predetermined range, the timing determination unit 28 performs timing of performing the shading correction by the correction unit 25 at a second time interval shorter than the predetermined time interval. decide. The details of these configurations will be described later.

  Next, the flow of processing when performing shading correction with such a multifunction machine 11 will be described. FIG. 5 is a flowchart showing a flow of processing when performing shading correction.

  Referring also to FIG. 5, the correction unit 25 determines whether or not the designated standby time has been reached (step S11 in FIG. 5, hereinafter, “step” is omitted). The timing at which the designated standby time in this case is reached is a predetermined timing.

If it is determined that the designated standby time has been reached (YES in S11), the correction unit 25 executes shading correction (S12). That is, the light is irradiated to the transport roller 38 by the light irradiator 43, and the reflected light from the transport roller 38 is received. Then, shading correction is performed based on the received reflected light. The correction value of the obtained shading correction at this time as a correction value data X _1.

After the shading correction is performed, the previous correction value data and the current correction value data are compared (S13). In this case, the change value deriving unit 27 is a value of a change between the correction value data X ₁ obtained when the shading correction is performed by the correction unit 25 and the previous correction value data X ₀ stored in the hard disk 17. Derive a change value. Specifically, determining the difference Y ₁ is the change value of the correction value data X ₀ and the correction value data X _1. Specifically, when the correction value data X ₀ is 700 and the correction value data X ₁ is 500 as a digital value, the difference Y ₁ is a numerical value of 200.

Thereafter, the determination unit 29 determines whether the change value derived by the change value deriving unit 27 is within a predetermined range (S14). That is, the difference Y ₁ determines whether it is within a predetermined range.

  If it is determined by the determination unit 29 that the value is within the predetermined range (YES in S14), the designated standby time is set long (S15). Specifically, the timing determination unit 28 performs timing of shading correction by the correction unit 25 so that the timing of performing shading correction by the correction unit 25 next time arrives at a first time interval longer than a predetermined time interval. decide. For example, when the predetermined time interval is one minute, the time interval of one minute and ten seconds, which is longer than one minute, is determined.

Thereafter, the storage control unit 26, a current correction value data _{X 1} is controlled so as to be stored in the hard disk 17 (S17). That is, the next is used when it is judged by the judging section 29, a correction value data X _1. Thereafter, the process waits until the designated waiting time is reached (S18). Incidentally, the correction value data X ₀ may be previously stored separately hard disk 17, it may be be stored in a so-called overwriting.

  On the other hand, if it is determined by the determination unit 29 that the value is not within the predetermined range (NO in S14), the designated standby time is set short (S19). Specifically, the timing determination unit 28 performs timing of shading correction by the correction unit 25 so that the timing of shading correction performed by the correction unit 25 next time arrives at a second time interval shorter than a predetermined time interval. decide. For example, when the predetermined time interval is one minute, the time interval of 50 seconds, which is shorter than one minute, is determined. The subsequent processing is the same as described above.

According to such a multifunction machine 11, the timing determination unit 28 determines the timing of performing the shading correction by the correction unit 25 next time based on the change value derived by the change value derivation unit 27. Specifically, if the difference Y ₁ is the change value the determination unit 29 determines that is within a predetermined range, performs shading correction by the correction unit 25 in the long first time interval than the predetermined time interval Determine the timing. Then, for example, when the change value is small, the frequency of performing the shading correction can be reduced, and energy saving can be realized. In this case, since the degree of change between the correction data of the shading correction and the previous correction data is small, the image quality at the time of reading the image can be maintained high to some extent. Therefore, energy saving is realized, and the image reading apparatus 14 can read an image according to the user's request.

  Moreover, according to such a multifunction machine 11, energy saving can be realized, and image formation can be performed according to the user's request.

  In this case, the timing determination unit 28 includes a determination unit 29 that determines whether the change value derived by the change value derivation unit 27 is within a predetermined range, and the change value is within the predetermined range by the determination unit 29. If it is determined that the shading correction is to be performed at the first time interval longer than the predetermined time interval, the timing to perform the shading correction based on whether or not it is within the predetermined range. It is possible to determine the timing of performing the shading correction at more appropriate timing.

  Further, in this case, if the determination unit 29 determines that the change value is out of the predetermined range, the timing determination unit 28 performs the shading correction by the correction unit 25 at a second time interval shorter than the predetermined time interval. In order to determine the timing to perform, the frequency of performing the shading correction can be increased to suppress the degradation of the image quality at the time of reading the image. Therefore, it is possible to read an image according to the user's request.

  In the above embodiment, the timing determination unit 28 includes the determination unit 29 and performs shading correction based on the determination result by the determination unit 28, that is, whether the change value is within a predetermined range. Although the timing is determined, the timing determination unit is not limited to this, and for example, the shading correction by the next correction unit 25 is correlated to have a correlation with the degree of change of the change value, for example. It may be determined when to perform.

  Further, the MFP 11 may have the following configuration. FIG. 6 is a block diagram showing a configuration of a control unit 52 provided in a multifunction peripheral as an image forming apparatus according to another embodiment of the present invention. FIG. 6 corresponds to FIG.

  Referring to FIG. 6, control unit 52 included in the multi-function device includes correction unit 25, storage control unit 26, change value derivation unit 27, timing determination unit 28, and determination unit 29 included in control unit 12 described above. In addition, it includes a stop instruction reception unit 53, a correction unit activation stop control unit 54, a time measurement unit 55, a detection unit 56, a restart control unit 57, a start instruction reception unit 58, and an inquiry reception unit 59. The stop instruction reception unit 53 receives an instruction to stop the shading correction by the correction unit 25. The correction unit operation stop control unit 54 controls to stop the operation of the correction unit 25 regardless of the timing determined by the timing determination unit 28 when the stop instruction reception unit 53 receives the instruction to stop the shading correction. . The time measuring unit 55 measures the lapse of time after the image reading device 14 reads the image of the document. The correction unit operation stop control unit 54 controls the operation of the correction unit 25 to be stopped when the time measured by the time measurement unit 55 passes a predetermined time. The detection unit 56 detects an operation request to the image reading device 14. The restart control unit 57 resumes the operation of the correction unit 25 controlled to be stopped by the correction unit operation stop control unit 54 when the detection unit 56 detects the request for the operation of the image reading device 14. The start instruction receiving unit 58 receives an instruction to start reading an image of a document. When timing determining unit 28 receives an instruction to start reading an image of a document from start instruction receiving unit 58, the timing when shading correction is performed by correction unit 25 is the same as that before reading of the image of the document by image reading device 14. Decide on the timing. If the timing of the shading correction by the correction unit 25 is reached while reading the image of the document by the image reading device 14, the inquiry reception unit 59 interrupts the reading of the image of the document by the image reading device 14 and performs the shading correction by the correction unit 25. Receive an inquiry about the presence or absence of execution.

  According to such a configuration, when the stop instruction reception unit 53 receives an instruction to stop the shading correction by the correction unit 25, the correction unit activation stop control unit 54 instructs the stop instruction reception unit 53 to stop the shading correction. If received, the control of the correction unit 25 is stopped regardless of the timing determined by the timing determination unit 28, so that the function of so-called shading correction can be turned off according to the user's request. Therefore, while realizing energy saving, it is possible to read an image according to the user's request.

  Further, the time measuring unit 55 measures the lapse of time after the image reading device 14 reads the image of the document, and the correction unit operation stop control unit 54 measures the time measured by the time measuring unit 55 for a predetermined time. In order to control so as to stop the operation of the correction unit 25, for example, the function of so-called shading correction may be turned off if a long time has passed after a predetermined time since the image of the document is read. it can. Therefore, energy saving can be realized.

  Further, the detection unit 56 detects a request for operation to the image reading device 14, and the resumption control unit 57 detects the request for operation to the image reading device 14 by the detection unit 56. In order to restart the operation of the correction unit 25 controlled to stop by 54, detection by the detection unit 56, specifically, detection of the user's operation on the operation unit 13, detection of the setting of the document 31 on the ADF 22, etc. When done, the shading correction feature can be turned on again to resume.

  In addition, start instruction accepting unit 58 accepts an instruction to start reading an image of a document. Then, when the start instruction receiving unit 58 receives an instruction to start reading the image of the document, the timing determining unit 28 sets the timing for performing the shading correction by the correcting unit 25 as reading of the image of the document by the image reading device 14. Since the shading correction is performed immediately before the start of reading to determine the previous timing, the image can be read with higher image quality.

  Further, when the timing of the shading correction by the correction unit 25 is reached during reading of the image of the document by the image reading device 14, the inquiry reception unit 59 interrupts reading of the image of the document by the image reading device 14 and causes the correction unit 25 to In order to receive an inquiry about the presence or absence of execution of shading correction, it is possible to read an image according to the user's request. That is, the user who wants to reduce the time loss in image reading, for example, does not interrupt the image reading. In addition, a user who wants to read an image with as high quality as possible has an interruption of image reading.

In the above embodiment, the change value deriving unit 27, it is assumed that to derive the difference Y ₁ of the previous correction value data X ₀ and present correction value data X ₁ as a change value, to not only, it is also possible to derive the rate of change of the correction value data X ₁ of this as a change value for the last correction value data X _0.

  In the above embodiment, the transport roller 38 is used as the white reference portion. However, the present invention is not limited to this, and another member as the white reference portion, for example, a part of the cover covering the mounting table 41 , Etc. may be used as the white reference portion.

  In the above embodiment, although the control units 12 and 52, the hard disk 17 and the like are included in the multifunction machine 11, the present invention is not limited to this. The image reading device 14 includes the control units 12 and 52, the hard disk 17 and the like. It is possible to have the configuration of That is, for example, the image reading device 14 is a light emitting unit that emits light to a document that reads an image, an image reading unit that reads an image of the document from reflected light from the document, and a white light And a correction unit for performing shading correction based on the light reflected by the white reference unit when the light irradiation unit reaches a predetermined timing. A storage unit for storing data, a storage control unit for controlling data of the correction value corrected by the correction unit to be stored in the storage unit, and data of the correction value obtained when the shading correction is performed by the correction unit And a change value deriving unit that derives a change value that is a value of a change of the data of the previous correction value stored in the storage unit, and the next correction based on the change value derived by the change value deriving unit. It may be configured to include a timing determination unit for determining a timing of the shading correction by parts.

  It should be understood that the embodiments disclosed herein are illustrative in all respects and not restrictive in any respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The image reading apparatus and the image forming apparatus according to the present invention can realize energy saving, and is particularly effectively used when it is required to read an image according to the user's request.

  DESCRIPTION OF SYMBOLS 11 MFP 12, control unit 12, 13 operation unit, 14 image reading device, 15 image forming unit, 16 sheet feeding cassette, 17 hard disk, 18 network interface unit, 19 main memory, 21 display screen, 22 ADF, 23 Network, 25 correction unit, 26 storage control unit, 27 change value derivation unit, 28 timing determination unit, 29 judgment unit, 31 document, 32 document setting table, 33 pickup roller, 34 separation roller, 35 reading position, 36, 37, 38 transport roller, 41 mounting table, 42 carriage, 43 light irradiation unit, 44 CCD sensor, 45 reference plate, 46 glass plate, 53 stop instruction reception unit, 54 correction unit operation stop control unit, 55 time measurement unit, 56 detection unit , 57 Restart control unit, 58 Start instruction receiving unit , 59 Inquiry reception part.

Claims (9)

An image reading apparatus for reading an image of a document,
A light irradiator that irradiates light to an original to read an image;
An image reading unit that reads an image of the document from reflected light from the document;
A white reference portion which is white and is provided at a position where the light emitting portion can emit light;
A correction unit that performs shading correction on the basis of the reflected light reflected by the white reference unit when the light irradiation unit reaches a predetermined timing;
A storage unit for storing data;
A storage control unit configured to control data of the correction value corrected by the correction unit to be stored in the storage unit;
A change value deriving unit that derives a change value that is a value of a change between data of a correction value obtained when the shading correction is performed by the correction unit and data of the previous correction value stored in the storage unit When,
An image reading apparatus comprising: a timing determination unit configured to determine a timing at which the shading correction is performed by the correction unit next time based on the change value derived by the change value deriving unit. The timing determination unit includes a determination unit that determines whether the change value derived by the change value derivation unit is within a predetermined range.
When it is determined by the determination unit that the change value is within the predetermined range, timing for performing the shading correction by the correction unit at a first time interval longer than a predetermined time interval is determined. The image reading device according to 1. The timing determination unit performs the shading correction by the correction unit at a second time interval shorter than the predetermined time interval if the determination unit determines that the change value is outside the predetermined range. The image reader according to claim 2, wherein the timing is determined. A stop instruction receiving unit that receives an instruction to stop the shading correction by the correction unit;
And a correction unit operation stop control unit that, when the stop instruction reception unit receives an instruction to stop the shading correction, stops the operation of the correction unit regardless of the timing determined by the timing determination unit. The image reading apparatus according to any one of claims 1 to 3, further comprising: The image reading apparatus further includes a time measuring unit that measures an elapsed time after reading an image of the document by the image reading apparatus.
The image reader according to claim 4, wherein the correction unit operation stop control unit controls to stop the operation of the correction unit when a time measured by the time measurement unit passes a predetermined time. A detection unit that detects an operation request to the image reading apparatus;
The image processing apparatus further comprises: a resumption control unit for resuming the operation of the correction unit controlled to stop by the correction unit operation stop control unit when the detection unit detects the operation request to the image reading apparatus. The image reader according to claim 4 or 5. The apparatus further comprises a start instruction receiving unit that receives an instruction to start reading the image of the document.
When the timing determination unit receives an instruction to start reading the image of the document from the start instruction receiving unit, the timing determination unit performs timing to perform the shading correction by the correction unit by reading the image of the document by the image reading device. The image reader according to any one of claims 1 to 6, wherein the timing is determined before the timing of. If timing of shading correction by the correction unit is reached during reading of the image of the document by the image reading device, reading of the image of the document by the image reading device is interrupted and execution of the shading correction by the correction unit is performed. The image reading apparatus according to any one of claims 1 to 7, further comprising an inquiry receiving unit that receives an inquiry about presence or absence. The image reading apparatus according to any one of claims 1 to 8.
An image forming unit configured to form an image based on an image of the document read by the image reading device.

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