JP2012044565A - Image reading device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image reading device which is able to cause a user to recognize a stain adhered to a reading glass without actual scanning.SOLUTION: When operation to instruct execution of scanning using a document movement system (S11:YES), a control part 200 irradiates light from a light source 11 to a white reference plate 41 for scanning an image to generate white reference image data (S13); and irradiates light from the light source 11 through a platen glass 28 to an opposing white plate 42 for scanning the image to generate correction data (S15). When comparing the white reference image data and the correction data, and a gradation difference between respective scanning positions becomes a standard value or more (S16:YES), the control part 200 judges there is a stain adhered to the platen glass 28. Based on the judgement result, the control part 200 adds a stain to sample image data to generate preview image data (S22), and displays an image based on the preview image data shown in Fig. 5(B) (S23).

Description

  The present invention relates to an image reading apparatus that warns of contamination of an image reading glass.

  The image reading apparatus reads an image of the original when the original conveyed from the original conveying apparatus passes on the reading glass. At this time, since the printing surface of the document passes over the reading glass, the toner printed on the document may adhere to the reading glass as dirt. When the image reading apparatus reads an image of a document in a state where dirt is attached to the reading glass, the image reading apparatus also reads the dirt as an image.

  As a conventional image reading apparatus, there is an apparatus that detects dirt on a reading glass and warns that the reading glass is dirty before reading an image (see, for example, Patent Document 1).

  In the image reading apparatus described in Patent Document 1, before actually reading an image of a document, light is applied to the opposing white plate, and image data based on the reflected light from the opposing white plate is read. At this time, when the reflection density of the opposed white plate is smaller than the predetermined value, the image reading apparatus determines that the reading glass is dirty and displays a warning screen indicating that the reading glass is dirty. To do.

JP-A-4-56476

  However, in the image reading apparatus described in Patent Document 1, since it is not known in which part of the reading glass the dirt is attached, it is necessary to actually scan the document and check the place where the dirt is attached. There wasn't.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an image reading apparatus capable of specifying a spot where dirt is attached without actually scanning a document.

  The image reading apparatus includes a storage unit, a first guide member and a second guide member, an image reading unit, an image generation unit, and a display unit. The storage means stores sample image data. The first guide member and the second guide member are arranged to face each other with a document conveyance path through which the document is conveyed. The first guide member is made of a transparent member. The second guide member includes an opposing white plate for white correction processing. The image reading unit irradiates light on the document on the document transport path through the first guide member, and generates image data based on reflected light from the document. The image generating means instructs the image reading means to generate correction data based on light irradiation to the opposing white plate and reflected light from the opposing white plate when the original is not on the original conveying path, and the reflected light from the opposing white plate. The first guide member is judged to be dirty based on the image data, and based on the determination result, image data corresponding to the dirt is added to the sample image data to generate preview image data. The display means displays an image based on the preview image data generated by the image generation means.

  In this configuration, the image generation unit causes the image reading unit to read the image on the opposing white plate when the document is not conveyed on the document conveyance path. The image reading unit irradiates the opposing white plate with light, and generates correction data based on the reflected light received from the opposing white plate. At this time, if dirt is attached to the first guide member, the irradiated light does not reach the opposing white plate, but is reflected at the place where the dirt on the first guide member is attached, and the amount of reflected light changes. . The image generating means determines whether the first guide member is dirty based on the reflected light from the opposing white plate. The image generation means generates preview image data by adding image data corresponding to dirt to the sample image data based on the determination result. The display means displays an image based on the preview image data.

  It is preferable that the image generation unit is configured to generate preview image data when the light amount of the reflected light from the counter white plate is equal to or less than a predetermined value.

  In this configuration, the image generation unit generates preview image data by adding image data corresponding to dirt to the sample image data when the light amount value of the reflected light from the opposing white plate is equal to or less than a predetermined value. This is because the portion of the first guide member where the dirt is attached has a smaller amount of reflected light than the portion where the dirt is not attached. Accordingly, the image reading apparatus can recognize the position of the dirt on the first guide member only by performing the scanning of the counter white plate that is executed before the actual scanning.

  It is preferable that a white reference member is further provided on the upstream side or the downstream side of the first guide member in the document transport direction and in the vicinity of the first guide member. In this case, the image generation unit instructs the image reading unit to irradiate the white reference member with light and generate white reference image data based on the reflected light from the white reference member. A predetermined value is determined based on the value.

  In this configuration, the image reading unit reads the image of the white reference member from the side where the original is not conveyed, that is, the side where the original is not contaminated. The image generation means determines the presence or absence of dirt on the reading glass by comparing the light amount value of the reflected light of the counter white plate with the light amount value of the reflected light of the white reference member. As a result, the image reading apparatus changes both the light quantity value of the reflected light of the opposing white plate and the light quantity value of the reflected light of the white reference member even if the light quantity of the irradiated light changes with the aging of the image reading means. Therefore, it is possible to accurately determine whether the first guide member is dirty.

  It is preferable that the storage unit further includes a selection receiving unit that stores a plurality of sample image data and receives a selection of one sample image data from the plurality of sample image data. In this case, the image generation unit generates preview image data by adding image data corresponding to dirt to the sample image data received by the selection reception unit.

  In this configuration, the storage unit stores, for example, photograph data, character data, mixed data including characters and photographs, halftone data, and the like as sample image data. The selection accepting unit accepts selection of sample image data similar to a document to be actually scanned from a plurality of sample image data. The image generation unit adds the image data corresponding to the stain to the sample image data received by the selection receiving unit and generates preview image data. As a result, the image reading apparatus can resemble the influence range of the stain as in actual scanning.

  It is preferable that the apparatus further includes an additional receiving unit that receives the addition of the sample image data. In this case, the storage unit stores the sample image data received by the additional receiving unit.

  In this configuration, image data input from an external device or image data read by the document fixing method is used as sample image data. Thereby, the image reading apparatus can determine the presence or absence of dirt on the reading glass using the image data of the original to be actually scanned.

  It is preferable that the display further includes an enlarged display receiving unit that receives an enlarged display of a part of the image based on the preview image data displayed on the display unit. In this case, the image generating unit regenerates image data obtained by enlarging a part of the image based on the preview image data received by the enlarged display receiving unit as preview image data.

  In this configuration, the enlarged display accepting unit accepts an enlarged display of a part of the image based on the preview image data. The image generating means generates image data obtained by enlarging and displaying a part of the image received by the enlarged display receiving means, and displays the image data on the display means. As a result, the image reading apparatus can display an enlarged portion where the dirt is attached, and can easily recognize the affected range of the dirt.

  The display means is preferably configured to display an image based on the sample image data and an image based on the preview image data side by side.

  In this configuration, the display means displays the image based on the sample image data without dirt and the image based on the preview image data with dirt side by side. As a result, the image reading apparatus can easily recognize a spot where dirt is attached by comparing and displaying the presence or absence of dirt.

  The image generation means preferably includes a conversion means for converting at least one of the resolution and the number of gradations of the sample image data.

  In this configuration, the image generating unit adds the image data corresponding to the stain after converting at least one of the resolution and the number of gradations of the sample image data. This is because, when an image is read from a document, the resolution and the number of gradations of the read image data differ according to various settings (resolution, color, and monochrome settings) at the time of scanning. Thus, the image reading apparatus can process the sample image data according to various settings at the time of scanning, and can generate preview image data.

  The sample image data is preferably configured to be full color data at the maximum reading resolution of the apparatus itself.

  In this configuration, the image generation unit generates preview image data by processing full color data at the maximum reading resolution of the apparatus itself. As a result, the image reading apparatus does not need to supplement the data even if the data is thinned out, so that the preview image data corresponding to the setting at the time of scanning can be generated accurately.

  It is preferable that the image generation unit is configured to perform white correction of correction data using white reference image data.

  In this configuration, the image generation unit performs white correction of the correction data using the white reference image data generated by reading the side of the white reference member on which the original is not conveyed, that is, the side on which the original is not contaminated. Thereby, the dirt included in the correction data is emphasized, so that the image reading apparatus can make the dirt more conspicuous.

  The image reading apparatus of the present invention can preview an image based on the preview image data obtained by processing the stain on the reading glass before performing the actual scan, and the position of the stain attached to the reading glass without performing the actual scan. Can be recognized.

It is the schematic of front sectional drawing of an image reading apparatus. It is a flowchart which shows the flow of a process of the control part by a document moving system. It is a flowchart which shows the flow of a process of the control part by a document moving system. It is a figure which shows the output value of the image which the 1st image reading unit read. It is a figure which shows an example of an operation screen and a preview screen. It is a figure which shows an example of the preview screen using different sample image data. It is a figure which shows an example of the preview screen displayed in parallel. It is a figure which shows an example of the preview screen displayed partially enlarged. It is a flowchart which shows the flow of a process of the control part at the time of addition of sample image data.

  As shown in FIG. 1, an image reading apparatus 100 according to an embodiment of the present invention is disposed on an upper part of an image forming apparatus such as a copying machine. The image reading apparatus 100 includes a control unit 200, a storage unit 201, an automatic document feeder (hereinafter referred to as ADF) 1, a first image reading unit 10, and a second image reading unit 20.

  The ADF 1 automatically transports the document along the document transport path F. In the ADF 1, a pickup roller 6, a plurality of transport roller pairs 7 </ b> A to 7 </ b> E, a registration roller pair 8, and a paper discharge roller pair 9 are arranged in a document transport path F from the document tray 5 to the paper discharge tray 30. The pickup roller 6 feeds the originals placed on the original tray 5 one by one. The conveyance roller pairs 7A to 7E convey the document along the document conveyance path F. The registration roller pair 8 adjusts the document transport timing. The paper discharge roller pair 9 discharges the original after image reading to the paper discharge tray 30. The document transport path F is formed in a substantially U shape around the second image reading unit 20.

  The ADF 1 and the first image reading unit 10 are connected by a hinge (not shown), and the upper surface of the first image reading unit 10 is freely opened and closed by the rotation of the hinge. The ADF 1 can be divided vertically in the position of the document transport path F between the platen glass 28 and the paper discharge roller pair 9. When the ADF 1 is divided into upper and lower parts, the space between the platen glass 28 and the paper discharge roller pair 9 in the document transport path F is opened to the outside.

  The first image reading unit 10 includes a document table 4 made of a transparent glass plate on the upper surface, and includes a light source unit 15, a mirror unit 16, a lens 13, and a CCD (image sensor) 14 inside. The first image reading unit 10 moves the light source unit 15 and the mirror unit 16 back and forth in the horizontal direction to read an image on the front side of the document. The light source unit 15 holds the light source 11 and the first mirror 12A. The mirror unit 16 holds the second mirror 12B and the third mirror 12C.

  The first image reading unit 10 corresponds to both an image reading method using a document fixing method for reading an image of a document placed on the document table 4 by a user and a document moving method for reading an image of the document conveyed by the ADF 1. Yes.

  When reading an original image by the original fixing method, the light source unit 15 and the mirror unit 16 move to home positions corresponding to the original fixing method, respectively. Thereafter, the light source unit 15 scans the image of the document by moving in the sub-scanning direction (left and right direction with respect to the paper surface) at a constant speed while irradiating the document with light. Similarly, it moves in the sub-scanning direction at a movement speed ½ of the movement speed. The light irradiated from the light source unit 15 and reflected from the document is reflected by the first mirror 12A, and then the optical path is changed by the second and third mirrors 12B and 12C. The light reflected from the third mirror 12C passes through the lens 13. The image is formed on the CCD 14 and converted into electrical image data.

  On the other hand, when the original image is read by the original moving method, the light source unit 15 and the mirror unit 16 remain stationary at the home position shown in FIG. 1 and the light source 11 is placed on the surface of the original conveyed on the platen glass 28 by the ADF 1. The image is scanned by irradiating light. The light reflected on the surface of the document passes through the platen glass 28 and is reflected by the first mirror 12A, and then is optically path-converted by the second and third mirrors 12B and 12C, and forms an image on the CCD 14 via the lens 13. And converted into electrical image data.

  The platen glass 28 is formed of a transparent member and constitutes a part of the lower surface guide of the document transport path F. A white reference plate 41 is disposed at the downstream end of the platen glass 28. A counter white plate 42 is disposed at a position facing the platen glass 28 across the document transport path F. The counter white plate 42 is used for white correction and constitutes a part of the upper surface guide of the document transport path F. The opposing white plate 42 may be provided with a transparent plate material on the side of the document conveyance path F.

  The second image reading unit 20 is a reduction optical system image reading means including a light source 21, first to fourth mirrors 22A, 22B, 22C, and 22D, a lens 23, and a CCD (image sensor) 24. Scan the side image. The second image reading unit 20 is unitized and stored in the ADF 1. The second image reading unit 20 may be an image reading unit of an equal-magnification optical system such as a contact image sensor for miniaturization.

  The second image reading unit 20 reads an image on the back side of the document conveyed on the document conveyance path F when a double-sided scanning request is made by the user. That is, the original on which the image on the front surface is read by the first image reading unit 10 passes under the light source 21 while being conveyed toward the paper discharge tray 30 along the original conveyance path F. At this time, the light source 21 emits light toward the back side of the document, and the light reflected from the back side of the document passes through the reading window 32 formed of a transparent member such as glass and sequentially passes through the mirrors 22A to 22D. After the conversion, the image is formed on the CCD 24 through the lens 23 and converted into electrical image data.

  In the document transport path F, the reading window 32 faces the counter white plate 33 so as to sandwich the document. The counter white plate 33 is used for white correction and constitutes a part of the lower surface guide of the document transport path F. The counter white plate 33 may be provided with a transparent plate material on the upper surface.

  The storage unit 201 stores a plurality of sample image data and a reference value used for determining whether there is dirt. The sample image data is, for example, photographic data, character data, mixed data composed of characters and photographs, halftone character data, halftone image data, and halftone mixed data. The sample image data is full color data with a maximum reading resolution (for example, 600 dpi) of the image reading apparatus 100. The maximum reading resolution is the maximum resolution of image data that can be generated by the image reading apparatus 100 during scanning.

  Next, the processing of the control unit 200 will be described with reference to FIGS. 2 to 8 for reading an image of a document by the document moving method of the first image reading unit 10. The first image reading unit 10 has a scanning range having a length comparable to the width of the maximum size original that can be conveyed in the direction (main scanning direction) orthogonal to the original conveyance direction in the original conveyance path F. .

  As illustrated in FIG. 2, the control unit 200 instructs the execution of scanning using the document movement method on the operation screen illustrated in FIG. 5A as an example in a state where the document is placed on the document tray 5. Wait until the operation is accepted (S11: NO). When the control unit 200 receives an operation for instructing execution of scanning (S11: YES), the light source unit 15 and the mirror unit 16 are positioned on the upstream side in the document conveyance path F from the home position shown in FIG. (S12), the image of the white reference plate 41 is read, and white reference image data is generated (S13).

  Since the image reading surface of the white reference plate 41 is located inside the first image reading unit 10, dirt does not adhere. As an example, as shown in FIG. 4A, the white reference image data is based on the characteristics of the light source 11, the mirrors 12 </ b> A to 12 </ b> C and the lens 13 constituting the first image reading unit 10, and the imaging system characteristics of the CCD 14. It is not uniform in the main scanning direction and is curved so that the gradation values at both ends are lower than the gradation value at the center.

  Next, the control unit 200 moves the light source unit 15 and the mirror unit 16 to the home position shown in FIG. 1 (S14), reads the image of the opposing white plate 42, and generates correction data (S15). At this time, light from the light source 11 passes through the platen glass 28 and is irradiated to the counter white plate 42.

  As an example, when the platen glass 28 is not soiled, the correction data is curved so that the gradation values at both ends are lower than the gradation values at the center as shown in FIG. In the correction data, when the platen glass 28 is dirty, as shown in FIG. 4B as an example, the gradation value of the spot where the dirt is attached falls locally.

  The control unit 200 compares the white reference image data and the correction data, and when the gradation difference at each scanning position is equal to or greater than the reference value (S16: YES), the control unit 200 determines that the platen glass 28 is contaminated. The process proceeds to S21 in FIG. When all the gradation differences at the respective scanning positions are less than the reference value (S16: NO), the control unit 200 determines that the platen glass 28 is not contaminated, and causes the ADF 1 to start conveying the document. The original is scanned (S17).

  The determination of whether the platen glass 28 is dirty is not limited to the above, and may be determined as follows. In S13, the control unit 200 calculates the reflection density of the white reference plate 41 indicating the ratio of the reflected light to the light applied to the white reference plate 41 for each scanning position. In S15, the light applied to the opposing white plate 42 The reflection density of the counter white plate 42 indicating the ratio of the reflected light to is calculated for each scanning position. In S16, the control unit 200 determines that dirt is attached to the platen glass 28 when the difference between the reflection density of the white reference plate 41 and the reflection density of the opposing white plate 42 is equal to or greater than the reference value, and the difference is less than the reference value. In this case, it is determined that the platen glass 28 is not contaminated.

  As shown in FIG. 3, in S21, the control unit 200 sets correction data as a reference value for white correction. In this case, the control unit 200 does not perform white correction on the correction data.

  The control unit 200 refers to the correction data to determine the scanning position where dirt is attached, and image data corresponding to the dirt (hereinafter, dirt is displayed so that the dirt is displayed at the scanning position where dirt is attached. (Referred to as image data) is added to the sample image data to generate preview image data (S22). For example, the control unit 200 calculates a division value obtained by dividing the correction data by the white reference image data for each scanning position in the main scanning direction. Then, the control unit 200 matches the scanning positions in the main scanning direction and multiplies the sample image data by each division unit. Preview image data is generated by sequentially multiplying each division value in the sub-scanning direction of the sample image data.

  The control unit 200 displays an image based on the preview image data shown in FIG. 5B as an example (S23). When the control unit 200 receives an operation for instructing execution of scanning on the operation screen (S24: YES), the control unit 200 starts scanning the document placed on the document tray 5 (S17 in FIG. 2).

  The control unit 200 switches the white correction reference value to the correction data or the white reference image data (S26) every time the mode switching button is pressed on the operation screen (S24: NO → S25: YES). Process. At this time, when correction data is set as a reference value for white correction, the control unit 200 generates preview image data using correction data that has not been subjected to white correction, and white reference image data as a reference value for white correction. Is set, preview image data is generated using correction data that has been subjected to white correction using white reference image data.

  Each time the control unit 200 receives an operation of pressing a detailed setting button indicating various settings at the time of scanning on the operation screen (S25: NO → S27: YES), the resolution or floor of the sample image data according to the various settings at the time of scanning. The logarithm is changed (S28), and the process of S22 is performed. For example, when the monochrome setting is selected, the control unit 200 changes the gradation number of the sample image data to binary, adds the dirt image data to the changed sample image data, and generates preview image data. For example, when the scan magnification is set, the control unit 200 changes the resolution of the sample image data according to the scan magnification, and adds the dirty image data to the changed sample image data to generate the preview image data. To do.

  Each time the control unit 200 receives a pressing operation of the image switching button on the operation screen (S27: NO → S29: YES), the control unit 200 switches to any one of the sample image data (S30) and S22. Perform the process. For example, as an example, the control unit 200 displays an image based on the preview image data obtained by adding the dirty image data to the character data illustrated in FIG. 6A or the data such as the halftone illustrated in FIG. The image is switched to an image based on the preview image data with the data added and displayed.

  When the control unit 200 receives an operation of pressing the enlargement display button on the operation screen (S29: NO → S31: YES), the control unit 200 performs the process of S22. At this time, the control unit 200 generates preview image data obtained by enlarging a portion to which dirt is attached, and displays an image (see FIG. 7) based on the preview image data.

  As described above, the image reading apparatus 100 can confirm the portion where the stain on the platen glass 28 is adhered without actually scanning the document.

  The image reading apparatus 100 generates preview image data using sample image data close to a document to be actually scanned from among various types of sample image data, thereby resembling the range of influence of dirt as in actual scanning. Can do.

  The image reading apparatus 100 changes the maximum reading resolution of the image reading apparatus 100 and the resolution and gradation number of the full-color sample image data according to various settings at the time of scanning, thereby preview image data corresponding to the various settings at the time of scanning. Can be generated. The image reading apparatus 100 does not need to store the sample image data corresponding to various settings at the time of scanning in the storage unit 201 in advance. As a result, the image forming apparatus 100 can easily check various settings at the time of scanning where dirt is less noticeable.

  By using the white reference image data as the white correction reference value, the image reading apparatus 100 adds the dirty image data to the sample image data so that the dirt is more conspicuous than when the white correction reference value is used as the correction data. Can do.

  The control unit 200 stores image data read by the document fixing method or image data input from an external device in the storage unit 201 as sample image data.

  For example, as shown in FIG. 9, the control unit 200 waits until the addition of sample image data is received (S41: NO). When receiving the addition of the sample image data (S41: YES), the control unit 200 moves the light source unit 15 and the mirror unit 16 to the home position corresponding to the document fixing method (S42). The control unit 200 scans the image by irradiating light from the light source 11 onto the document placed on the document table 4 while moving the light source unit 15 and the mirror unit 16 in the sub-scanning direction at a constant speed. Sample image data is generated at the maximum reading resolution and full color of the reading apparatus 100 (S43). The control unit 200 stores the generated sample image data in the storage unit 201 (S44). As described above, the image reading apparatus 100 can use the image data of the document to be scanned as the sample image data by reading the document placed on the document table 4 on which dirt is not attached.

  In the above-described embodiment, the control unit 200 displays only the image based on the preview image data in S23 of FIG. 3, but may display the image based on the sample image data and the image based on the preview image data side by side. Good. At this time, as an example, the control unit 200 may display an image based on the sample image data and an image based on the preview image data side by side or side by side in accordance with the size of the sample image data as shown in FIG. . As a result, the image reading apparatus 100 can easily recognize the position of the stain on the platen glass 28.

  In the above-described embodiment, before the scan is executed, if the platen glass is dirty, the dirty image data is added to the sample image data and a preview is displayed. However, the preview image may be displayed by adding dirt image data to the sample image data at the timing when a specific operation button is selected. This is effective during maintenance of the image reading apparatus.

  In the above-described example, when the original image is read by the original moving method of the first image reading unit 10, the dirt image data of the platen glass 28 is added to the sample image data and previewed. However, when the second image reading unit 20 reads an image of a document, the dirt image data of the reading window 32 may be added to the sample image data and previewed. In this case, the first image reading unit 10 reads the image of the white reference plate 41 and generates white reference image data.

  In the above-described embodiment, each time scanning is performed, the first image reading unit 10 reads the image on the white reference plate 41 and generates white reference image data. However, the first image reading unit 10 may read the image of the white reference plate 41 to generate white reference image data and store it in the storage unit 201 in advance at the time of shipment from the factory.

  The description of the above-described embodiment is an example in all respects and should be considered as not restrictive. The scope of the present invention is shown not by the above embodiments but by the claims. Further, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

DESCRIPTION OF SYMBOLS 100 ... Image reading apparatus 200 ... Control part 201 ... Memory | storage part 10 ... 1st image reading unit 28 ... Platen glass 41 ... White reference board 42 ... Opposing white board 20 ... 2nd image reading unit 32 ... Reading window 33 ... Opposing white board F ... Document transport path

Claims (10)

Storage means for storing sample image data;
A first guide member and a second guide member, which are disposed to face each other across a document transport path through which a document is transported, include a first guide member made of a transparent member and a counter white plate for white correction processing. Two guide members;
Image reading means for irradiating light on the document on the document transport path through the first guide member and generating image data based on reflected light from the document;
When the original does not exist on the original transport path, the image reading unit is instructed to irradiate light to the opposing white plate and generate correction data based on reflected light from the opposing white plate, and reflect from the opposing white plate. Image generating means for determining dirt on the first guide member based on light and adding preview image data by adding image data corresponding to the dirt to the sample image data based on the determination result;
An image reading apparatus comprising: display means for displaying an image based on the preview image data generated by the image generating means.   The image reading apparatus according to claim 1, wherein the image generation unit generates the preview image data when a light amount value of reflected light from the counter white plate is a predetermined value or less. A white reference member further upstream or downstream of the first guide member in the document transport direction and in the vicinity of the first guide member;
The image generation unit instructs the image reading unit to irradiate the white reference member with light and generate white reference image data based on the reflected light from the white reference member, and reflects the reflected light from the white reference member. The image reading apparatus according to claim 2, wherein the predetermined value is determined on the basis of a light quantity value. The storage means stores a plurality of sample image data,
A selection receiving means for receiving selection of one sample image data from the plurality of sample image data;
The image reading apparatus according to claim 1, wherein the image generation unit generates preview image data by adding image data corresponding to dirt to the sample image data received by the selection reception unit. Further comprising an additional receiving means for receiving the addition of the sample image data,
The image reading apparatus according to claim 4, wherein the storage unit stores sample image data received by the additional reception unit. An enlarged display receiving means for receiving an enlarged display of a part of the image based on the preview image data displayed on the display means;
The image reading device according to claim 1, wherein the image generation unit regenerates image data obtained by enlarging a part of an image based on the preview image data received by the enlarged display reception unit as preview image data. .   The image reading apparatus according to claim 1, wherein the display unit displays an image based on the sample image data and an image based on the preview image data side by side.   The image reading apparatus according to claim 1, wherein the image generation unit includes a conversion unit that converts at least one of a resolution and a gradation number of the sample image data.   The image reading apparatus according to claim 8, wherein the sample image data is full-color data at a maximum reading resolution of the apparatus itself.   The image reading apparatus according to claim 3, wherein the image generation unit performs white correction of the correction data using the white reference image data.