Image reading system, image reading device, and display method

Abstract

To improve user convenience in an image reading system.SOLUTION: An imaging device has a plurality of imaging elements arranged in a direction intersecting a transport path on the opposite side of the transport path across a transparent member arranged in the transport path of a document. The imaging device causes a display device to display a position of a noise in a document image of the document captured by the imaging device on the basis of detecting that there is the noise in the image captured through the transparent member.SELECTED DRAWING: Figure 12

Description

[Technical field]

[0001] The present invention relates to an image reading system, an image reading device, and a display method. [Background technology]

[0002] Patent Document 1 discloses an image reading device that conveys an image of a document facing an imaging unit in which multiple image sensors are arranged in a line, and captures the image of the document with the imaging unit. The image reading device described in Patent Document 1 can detect the presence of a foreign object such as paper powder or dust at the imaging position based on a white reference image captured by an image of a white reference member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-161418 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, Patent Document 1 does not disclose detection of the position of a foreign object relative to an image obtained by reading a document. User convenience would be improved if it were possible to notify the position of a foreign object relative to an image obtained by reading a document. [Means for solving the problem]

[0005] The image reading system includes a transport device that transports an original along a transport path, a light-transmitting member that is optically transparent and is arranged on the transport path, an imaging device that has a plurality of imaging elements arranged on the opposite side of the transport path across the light-transmitting member in a direction intersecting the transport path and images the original through the light-transmitting member, a control unit that causes the imaging device to image the original while the transport device is transporting the original, and a display device that displays information, and based on detection that there is noise in the image captured by the imaging device, the control unit causes the display device to display the position of the noise relative to the original image of the original captured by the imaging device.

[0006] The image reading device includes a transport device that transports an original document along a transport path, a light-transmitting member that is optically transparent and is arranged on the transport path, an imaging device that has a plurality of imaging elements arranged on the opposite side of the transport path, across the light-transmitting member, and images the original document through the light-transmitting member, a control unit that causes the imaging device to image the original document while the transport device is transporting the original document, and a display device that displays information, and based on detection that there is noise in the image captured by the imaging device, the control unit causes the display device to display the position of the noise relative to the original image of the original document captured by the imaging device.

[0007] The display method includes detecting the presence of noise in an image captured through a light-transmitting member by an imaging device having a plurality of imaging elements arranged in a direction intersecting the transport path on the opposite side of the transport path, the light-transmitting member being sandwiched therebetween, and displaying on a display device the position of the noise relative to an original image of the original captured by the imaging device. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram illustrating a schematic configuration of an image reading system. [Diagram 2] FIG. 2 is a schematic diagram illustrating a schematic configuration of a scanner. [Diagram 3] FIG. 2 is a schematic diagram illustrating a schematic configuration of a reading unit. [Figure 4] FIG. 4 is a block diagram showing a control configuration of the scanner. [Diagram 5] FIG. 4 is a diagram showing an example of luminance values ​​when a reference plate is read by a line sensor. [Figure 6] FIG. 4 is a diagram showing an example of luminance values ​​when a reference plate is read by a line sensor. [Figure 7] FIG. 11 is a diagram showing an example of a difference between reference data and luminance data. [Figure 8] FIG. 4 is a diagram showing the flow of noise detection processing. [Figure 9] FIG. 13 is a diagram showing an example of a first alert image. [Figure 10] 6 is a diagram showing an example of luminance values ​​when an original is read by a line sensor; [Figure 11] 6 is a diagram showing the flow of a streak determination process. [Figure 12] FIG. 13 is a diagram showing an example of a second alert image. [Figure 13] FIG. 13 is a diagram showing an example of a second alert image. [Figure 14] FIG. 13 is a diagram showing an example of a second alert image. [Figure 15] FIG. 13 is a diagram showing an example of a second alert image. [Figure 16] FIG. 13 is a diagram showing an example of a first alert image. [Figure 17] FIG. 4 is a schematic diagram illustrating an example of a noise detection method. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] As shown in FIG. 1, the image reading system 1 includes a scanner 2 and a control device 3. The scanner 2 is an example of an image reading device that reads an image of an original document M. The original document M is an example of a medium. The scanner 2 reads the image of the original document M based on an instruction transmitted from the control device 3. The scanner 2 transmits image data of the read original document M to the control device 3. The scanner 2 is connected to a network 4. The control device 3 is connected to the network 4. The scanner 2 and the control device 3 are connected so as to be able to communicate with each other via the network 4. A configuration in which the scanner 2 and the control device 3 are connected via the network 4 is called the image reading system 1.

[0010] The network 4 is, for example, a LAN (Local Area Network), and communication is performed according to the Ethernet (registered trademark) standard. The connection between the scanner 2 and the network 4 may be a wired connection or a wireless connection. The connection between the control device 3 and the network 4 may be a wired connection or a wireless connection. The image reading system 1 is not limited to a configuration in which the scanner 2 and the control device 3 are connected via the network 4. The image reading system 1 may also be configured in such a way that the scanner 2 and the control device 3 are directly connected to each other via a wired or wireless connection.

[0011] The scanner 2 has a display panel 10, a case 11, and a document support 12. The display panel 10 displays various information. The display panel 10 is an example of a display device. In this embodiment, the display panel 10 can receive instructions related to the operation of the scanner 2. The display panel 10 is a touch panel that receives touch operations by a user. The display panel 10 receives instructions related to the operation of the scanner 2 based on touch operations by a user. The case 11 forms the outer shell of the scanner 2. The case 11 includes a main body 13 and a cover 14. The display panel 10 is disposed in the cover 14. The case 11 is provided with a supply port 15 and a discharge port 16. The document support 12 supports the document M. The document support 12 places the document M in a cut sheet form. The document support 12 can place multiple documents M.

[0012] The original support 12 is disposed above the case 11. The original support 12 is provided at a position that connects to the supply port 15. The supply port 15 is an inlet that introduces the original M placed on the original support 12 into the inside of the case 11. The supply port 15 connects to the original support 12. The supply port 15 is located above the case 11. The discharge port 16 is an outlet that discharges the original M introduced into the inside of the case 11 from the supply port 15 to the outside of the case 11. The discharge port 16 is provided below the case 11.

[0013] The cover 14 can be opened and closed relative to the main body 13. In the scanner 2, the cover 14 can be opened and closed relative to the main body 13 by rotating the cover 14 relative to the main body 13. With the cover 14 open relative to the main body 13, a transport path for the original M leading to the inside of the case 11 can be exposed. This allows, for example, an operator to resolve a jam of the original M inside the case 11. Also, for example, with the cover 14 open relative to the main body 13, an operator can clean the original reading unit.

[0014] As shown in FIG. 2, the scanner 2 includes a conveying device 21, a double-feed detection sensor 22, a medium detection sensor 23, a reading unit 25, and a first control circuit 27 inside the case 11. The conveying device 21 conveys the document M introduced into the case 11 from the supply port 15 toward the discharge port 16 in a conveying direction T along the conveying path 28. The conveying device 21 conveys the document M from the top to the bottom of the case 11. The document M is not limited to paper. The document M may be made of a film, a fabric, or the like. The conveying device 21 conveys the document M placed on the document support 12 one by one. The conveying device 21 includes a conveying path 28, a first conveying roller pair 31, a second conveying roller pair 32, a third conveying roller pair 33, a fourth conveying roller pair 34, and a conveying motor 35.

[0015] The transport path 28 is a path along which the original M moves from the supply port 15 to the discharge port 16. The original M is transported along the transport path 28 from the supply port 15 to the discharge port 16. A first transport roller pair 31, a second transport roller pair 32, a third transport roller pair 33, and a fourth transport roller pair 34 are arranged along the transport path 28. The transport path 28 corresponds to an example of a transport path. Each of the first transport roller pair 31, the second transport roller pair 32, the third transport roller pair 33, and the fourth transport roller pair 34 is an example of a transport roller.

[0016] The first transport roller pair 31 transports the document M supplied to the supply port 15 along the transport path 28. When multiple documents M are placed on the document support 12, the first transport roller pair 31 supplies the document M located at the top of the multiple documents M into the transport path 28. The first transport roller pair 31 includes a first drive roller 31A and a first driven roller 31B. The first drive roller 31A transmits a driving force for transporting the document M. The first drive roller 31A is driven to rotate by the driving force of a transport motor 35 described later. The first drive roller 31A is driven to rotate to transport the document M along the transport path 28. The first driven roller 31B comes into contact with the first drive roller 31A. The first driven roller 31B is driven to rotate when the first drive roller 31A is driven to rotate. The first driven roller 31B holds the document M between the first driving roller 31A and conveys the document M along the conveying path .

[0017] The second transport roller pair 32 is disposed downstream of the first transport roller pair 31 in the transport direction T. The second transport roller pair 32 transports the document M transported by the first transport roller pair 31 along the transport path 28. The second transport roller pair 32 functions as a separation mechanism that separates the document M transported by the first transport roller pair 31 one by one. The second transport roller pair 32 includes a second drive roller 32A and a second driven roller 32B. The second drive roller 32A transmits a driving force for transporting the document M. The second drive roller 32A is driven to rotate by the driving force of the transport motor 35. The second drive roller 32A is driven to rotate to transport the document M along the transport path 28. The second driven roller 32B comes into contact with the second drive roller 32A. The second driven roller 32B is driven to rotate when the second drive roller 32A is driven to rotate. The second driven roller 32B holds the document M together with the second drive roller 32A and transports the document M along the transport path 28. The coefficient of friction of the outer circumferential surface of the second driven roller 32B with respect to the document M is greater than the coefficient of friction of the outer circumferential surface of the second drive roller 32A with respect to the document M. As the second transport roller pair 32 rotates, the document M is separated into individual sheets.

[0018] The third transport roller pair 33 is disposed downstream of the second transport roller pair 32 in the transport direction T. The third transport roller pair 33 transports the document M transported by the second transport roller pair 32 along the transport path 28. The third transport roller pair 33 includes a third drive roller 33A and a third driven roller 33B. The third drive roller 33A transmits a driving force for transporting the document M. The third drive roller 33A is driven to rotate by the driving force of the transport motor 35. The third drive roller 33A is driven to rotate, thereby transporting the document M along the transport path 28. The third driven roller 33B comes into contact with the third drive roller 33A. The third driven roller 33B is driven to rotate when the third drive roller 33A is driven to rotate. The third driven roller 33B holds the document M with the third drive roller 33A and transports the document M along the transport path 28.

[0019] The fourth transport roller pair 34 is disposed downstream of the third transport roller pair 33 in the transport direction T. The fourth transport roller pair 34 transports the document M transported by the third transport roller pair 33 along the transport path 28. The fourth transport roller pair 34 transports the document M toward the discharge port 16. The fourth transport roller pair 34 includes a fourth drive roller 34A and a fourth driven roller 34B. The fourth drive roller 34A transmits a driving force for transporting the document M. The fourth drive roller 34A is driven to rotate by the driving force of the transport motor 35. The fourth drive roller 34A is driven to rotate to transport the document M along the transport path 28. The fourth driven roller 34B comes into contact with the fourth drive roller 34A. The fourth driven roller 34B is driven to rotate when the fourth drive roller 34A is driven to rotate. The fourth driven roller 34B holds the document M between the fourth drive roller 34A and conveys the document M along the conveying path 28.

[0020] The multi-feed detection sensor 22 detects multi-feed of the original M transported along the transport path 28. In this embodiment, the multi-feed detection sensor 22 is disposed between the second transport roller pair 32 and the third transport roller pair 33. In other words, the multi-feed detection sensor 22 is located upstream of the third transport roller pair 33 on the transport path 28. The multi-feed detection sensor 22 is located downstream of the second transport roller pair 32 on the transport path 28. The multi-feed detection sensor 22 is disposed along the transport path 28. The multi-feed detection sensor 22 includes a transmitting unit 22A and a receiving unit 22B. The transmitting unit 22A and the receiving unit 22B are located on opposite sides of the transport path 28.

[0021] The transmitting unit 22A transmits ultrasonic waves. The transmitting unit 22A includes an ultrasonic transmitting element. The ultrasonic transmitting element transmits ultrasonic waves. The ultrasonic waves transmitted by the ultrasonic transmitting element are transmitted from the transmitting unit 22A toward the transport path 28. When ultrasonic waves are transmitted while a document M is being transported to a position opposite the transmitting unit 22A, the ultrasonic waves pass through the document M and are transmitted to the receiving unit 22B. When the ultrasonic waves pass through the document M, the sound pressure of the ultrasonic waves is attenuated.

[0022] The receiving unit 22B receives ultrasonic waves. The receiving unit 22B includes an ultrasonic receiving element. The ultrasonic receiving element receives ultrasonic waves. The ultrasonic waves transmitted from the transmitting unit 22A toward the transport path 28 are received by the ultrasonic receiving element of the receiving unit 22B. The receiving unit 22B receives ultrasonic waves transmitted from the transmitting unit 22A and passing through the transport path 28. When ultrasonic waves are transmitted while the document M is transported to a position opposite the transmitting unit 22A, the receiving unit 22B receives the ultrasonic waves that have passed through the document M. The receiving unit 22B generates a receiving signal according to the sound pressure of the ultrasonic waves. The receiving unit 22B transmits the generated receiving signal to the first control circuit 27. The first control circuit 27 detects multiple feeding of the document M based on the strength of the receiving signal received from the receiving unit 22B.

[0023] The medium detection sensor 23 detects the original M transported along the transport path 28. In this embodiment, the medium detection sensor 23 is disposed between the double feed detection sensor 22 and the third transport roller pair 33. In other words, the medium detection sensor 23 is located upstream of the third transport roller pair 33 on the transport path 28. The medium detection sensor 23 is located downstream of the double feed detection sensor 22 on the transport path 28. The medium detection sensor 23 is disposed along the transport path 28. For example, an optical sensor can be applied as the medium detection sensor 23. The medium detection sensor 23 includes a light emitting unit 23A and a light receiving unit 23B. The light emitting unit 23A and the light receiving unit 23B are located on opposite sides of the transport path 28.

[0024] When original M is present between light-emitting unit 23A and light-receiving unit 23B, the light directed from light-emitting unit 23A to light-receiving unit 23B is blocked by original M. At this time, the intensity of the electrical signal output from light-receiving unit 23B changes, making it possible to detect the presence of original M. The medium detection sensor 23 transmits the electrical signal output from light-receiving unit 23B as a detection signal to the first control circuit 27. The first control circuit 27 detects the leading edge and trailing edge of original M based on the change in the detection signal received from the medium detection sensor 23.

[0025] The reading unit 25 reads the document M transported along the transport path 28. The reading unit 25 is disposed along the transport path 28. In this embodiment, the reading unit 25 is disposed between the third transport roller pair 33 and the fourth transport roller pair 34. In other words, the reading unit 25 is located upstream of the fourth transport roller pair 34 on the transport path 28. The reading unit 25 is located downstream of the third transport roller pair 33 on the transport path 28. The reading unit 25 includes a first scanner 41 and a second scanner 42. The first scanner 41 and the second scanner 42 are located on opposite sides of the transport path 28. The first scanner 41 is located between the transport path 28 and the cover 14. The second scanner 42 is located between the transport path 28 and the main body 13.

[0026] The first scanner 41 reads a first side 43 of the original M transported along the transport path 28. The first side 43 is the side of the original M located on the transport path 28 that faces the cover 14. The first scanner 41 reads the first side 43 of the original M and generates first read data. The second scanner 42 reads a second side 44 of the original M transported along the transport path 28. The second side 44 of the original M is the reverse side of the first side 43 of the original M. The second side 44 is the side of the original M located on the transport path 28 that faces the main body 13. The second scanner 42 reads the second side 44 of the original M and generates second read data.

[0027] As shown in FIG. 3, the first scanner 41 has a first light source 46A, a first line sensor 47A, a first light-transmitting plate 48A, and a first reference plate 49A. The second scanner 42 has a second light source 46B, a second line sensor 47B, a second light-transmitting plate 48B, and a second reference plate 49B. The first light source 46A and the second light source 46B have the same configuration. The first line sensor 47A and the second line sensor 47B have the same configuration. The first light-transmitting plate 48A and the second light-transmitting plate 48B have the same configuration. The first reference plate 49A and the second reference plate 49B have the same configuration.

[0028] The first line sensor 47A and the second line sensor 47B are each an example of an imaging device. The first light-transmitting plate 48A and the second light-transmitting plate 48B are each an example of a light-transmitting member. The first reference plate 49A and the second reference plate 49B are each an example of a white member. Hereinafter, the first line sensor 47A and the second line sensor 47B may each be referred to as a line sensor 47. The first light-transmitting plate 48A and the second light-transmitting plate 48B may each be referred to as a light-transmitting plate 48. The first reference plate 49A and the second reference plate 49B may each be referred to as a reference plate 49.

[0029] The first light source 46A irradiates light toward the transport path 28. The first light source 46A is provided along the document width direction perpendicular to the transport direction T of the document M. The first light source 46A has a length that spans the transport path 28 along the document width direction perpendicular to the transport direction T. The first light source 46A irradiates light to the first surface 43 of the document M transported along the transport path 28. The first light source 46A is inclined with respect to the transport path 28. The first light source 46A is inclined from the upstream to the downstream in the transport direction T along the direction from the first scanner 41 to the second scanner 42. That is, the optical axis of the first light source 46A is inclined from the upstream to the downstream in the transport direction T.

[0030] The first line sensor 47A is located downstream of the first light source 46A in the transport direction T. The first line sensor 47A receives light reflected from the first surface 43 of the document M. The first line sensor 47A has a plurality of photodiodes, which are an example of photoelectric conversion elements, arranged along the document width direction perpendicular to the transport direction T of the document M. One photoelectric conversion element corresponds to one pixel. The array of the plurality of photoelectric conversion elements has a length that spans the transport path 28 along the document width direction perpendicular to the transport direction T. A CMOS (Complementary Metal-Oxide-Semiconductor) image sensor, a CCD (Charge Coupled Device) image sensor, or the like can be applied as the first line sensor 47A. The photoelectric conversion element is an example of an imaging element. The first line sensor 47A reads the first surface 43 of the document M by receiving light.

[0031] The first light-transmitting plate 48A is a plate-like member having optical transparency. The first light-transmitting plate 48A is located between the first line sensor 47A and the transport path 28. The light emitted from the first light source 46A reaches the inside of the transport path 28 through the first light-transmitting plate 48A. The light reflected by the document M located inside the transport path 28 reaches the first line sensor 47A through the first light-transmitting plate 48A. The first light-transmitting plate 48A has a length that spans the transport path 28 along the document width direction perpendicular to the transport direction T. The first light-transmitting plate 48A can be made of, for example, glass or resin. The first light-transmitting plate 48A forms a part of a wall that divides the transport path 28.

[0032] The first reference plate 49A is located on the opposite side of the first light-transmitting plate 48A from the transport path 28. The first reference plate 49A is located upstream of the first light source 46A in the transport direction T. The first reference plate 49A has a length that spans the transport path 28 along the document width direction perpendicular to the transport direction T. The first reference plate 49A faces the second line sensor 47B across the transport path 28. The first reference plate 49A also faces the second light source 46B across the transport path 28. In other words, the second line sensor 47B and the second light source 46B overlap the first reference plate 49A when viewed in the direction from the second scanner 42 to the first scanner 41.

[0033] The second light source 46B irradiates light toward the transport path 28. The second light source 46B is provided along the document width direction perpendicular to the transport direction T of the document M. The second light source 46B has a length that spans the transport path 28 along the document width direction perpendicular to the transport direction T. The second light source 46B irradiates light to the second surface 44 of the document M transported along the transport path 28. The second light source 46B is inclined with respect to the transport path 28. The second light source 46B is inclined from upstream to downstream in the transport direction T along the direction from the second scanner 42 to the first scanner 41. In other words, the optical axis of the second light source 46B is inclined from upstream to downstream in the transport direction T.

[0034] The second line sensor 47B is located downstream of the second light source 46B in the transport direction T. The second line sensor 47B receives light reflected from the second surface 44 of the document M. In the second line sensor 47B, a plurality of photodiodes, which are an example of photoelectric conversion elements, are arranged along the document width direction perpendicular to the transport direction T of the document M. One photoelectric conversion element corresponds to one pixel. The arrangement of the plurality of photoelectric conversion elements has a length that spans the transport path 28 along the document width direction perpendicular to the transport direction T. A CMOS image sensor, a CCD image sensor, or the like can be applied as the second line sensor 47B. The second line sensor 47B reads the second surface 44 of the document M by receiving light.

[0035] Reading by the first line sensor 47A and the second line sensor 47B is also expressed as imaging. Images captured by the first line sensor 47A and the second line sensor 47B are called captured images. Images of the original M read by the first line sensor 47A and the second line sensor 47B are called original images.

[0036] The second light-transmitting plate 48B is a plate-like member having optical transparency. The second light-transmitting plate 48B is located between the second line sensor 47B and the transport path 28. The light emitted from the second light source 46B reaches the inside of the transport path 28 through the second light-transmitting plate 48B. The light reflected by the document M located inside the transport path 28 reaches the second line sensor 47B through the second light-transmitting plate 48B. The second light-transmitting plate 48B has a length that spans the transport path 28 along the document width direction perpendicular to the transport direction T. The second light-transmitting plate 48B can be made of, for example, glass or resin. The second light-transmitting plate 48B forms a part of a wall that divides the transport path 28.

[0037] The second reference plate 49B is located on the opposite side of the second light-transmitting plate 48B from the transport path 28. The second reference plate 49B is located downstream of the second light source 46B in the transport direction T. The second reference plate 49B has a length that spans the transport path 28 along the document width direction perpendicular to the transport direction T. The second reference plate 49B faces the first line sensor 47A across the transport path 28. The second reference plate 49B also faces the first light source 46A across the transport path 28. In other words, the first line sensor 47A and the first light source 46A overlap the second reference plate 49B when viewed in the direction from the first scanner 41 to the second scanner 42.

[0038] The first reference plate 49A faces the second line sensor 47B and the second light source 46B across the transport path 28. Light from the second light source 46B is irradiated onto the first reference plate 49A. The first reference plate 49A reflects the light from the second light source 46B. The light from the second light source 46B reflected by the first reference plate 49A is received by the second line sensor 47B. The first reference plate 49A is read as an image by the second line sensor 47B. The image of the first reference plate 49A read by the second line sensor 47B is used for correction such as shading correction.

[0039] The second reference plate 49B faces the first line sensor 47A and the first light source 46A across the conveying path 28. The second reference plate 49B is irradiated with light from the first light source 46A. The second reference plate 49B reflects the light from the first light source 46A. The light from the first light source 46A reflected by the second reference plate 49B is received by the first line sensor 47A. The second reference plate 49B is read as an image by the first line sensor 47A. The image of the second reference plate 49B read by the first line sensor 47A is used for correction such as shading correction. The first reference plate 49A and the second reference plate 49B can each be made of various materials such as resin and metal. The first reference plate 49A and the second reference plate 49B can each be made of various colors such as white, gray, and black. In this embodiment, the first reference plate 49A and the second reference plate 49B are each white.

[0040] As shown in FIG. 4, the first control circuit 27 includes a communication interface 51, a first control unit 52, and a memory 53. The first control unit 52 is an example of a control unit. In FIG. 4, the interface is denoted as I / F. The communication interface 51 is communicatively connected to an external device such as the control device 3. The communication interface 51 communicates with the external device according to a predetermined communication protocol. The form of communication may be either wired or wireless. The communication interface 51 includes, for example, a connection port for wired communication, an antenna for wireless communication, and an interface circuit. The communication interface 51 receives various commands from the control device 3. The communication interface 51 transmits various data to the control device 3. The communication interface 51 transmits image data read by the reading unit 25 to the control device 3.

[0041] The first control circuit 27 is a controller that performs various controls. As an example, the first control circuit 27 is a processor having a CPU (Central Processing Unit). The first control circuit 27 may be composed of one or more processors. The memory 53 includes storage circuits such as a RAM (Random Access Memory) and a ROM (Read Only Memory). The RAM is used for temporary storage of various data and the like. The ROM stores a control program 55 for controlling the operation of the scanner 2, various setting information including threshold data 56 and reference data 57, and the like. The memory 53 functions as a work area for the first control circuit 27. The first control circuit 27 functions as various functional parts by executing the control program 55 stored in the memory 53.

[0042] The first control circuit 27 includes, as functional units, a transport control unit 61, a reading control unit 62, a display control unit 63, a noise determination unit 64, and a document position determination unit 65. The first control circuit 27 executes a control program 55 stored in the memory 53 to function as each of the functional units of the transport control unit 61, the reading control unit 62, the display control unit 63, the noise determination unit 64, and the document position determination unit 65. The transport control unit 61 controls the driving of the transport motor 35 to control the transport of the document M by the transport device 21. The transport control unit 61 drives the transport motor 35 to transport the document M along the transport path 28. The transport control unit 61 controls the timing to start transporting the document M, the transport speed of the document M, and the stop of transporting the document M.

[0043] The reading control unit 62 controls the driving of the reading unit 25, thereby controlling the reading of the original M. The reading control unit 62 operates the reading unit 25, thereby causing the reading unit 25 to read the original M. The reading control unit 62 controls the timing at which the reading unit 25 starts reading, the timing at which the reading is stopped, single-sided / double-sided reading, etc. The display control unit 63 controls the driving of the display panel 10, thereby causing the display panel 10 to display various information. The display control unit 63 accepts information input by the user via the display panel 10 into the first control unit 52.

[0044] The noise determination unit 64 determines whether noise occurs in the image data obtained by reading the second reference plate 49B by the first line sensor 47A. The noise determination unit 64 determines whether noise occurs in the image data obtained by reading the first reference plate 49A by the second line sensor 47B. The document position determination unit 65 determines the position of the document M relative to the first line sensor 47A based on the image data obtained by reading the document M by the first line sensor 47A. The document position determination unit 65 determines the position of the document M relative to the second line sensor 47B based on the image data obtained by reading the document M by the second line sensor 47B.

[0045] When the first line sensor 47A reads the second reference plate 49B, the first line sensor 47A reads the second reference plate 49B through the first light-transmitting plate 48A. Therefore, reading the second reference plate 49B by the first line sensor 47A is equivalent to reading the first light-transmitting plate 48A by the first line sensor 47A. Similarly, when the second line sensor 47B reads the first reference plate 49A, the second line sensor 47B reads the first reference plate 49A through the second light-transmitting plate 48B. Therefore, reading the first reference plate 49A by the second line sensor 47B is equivalent to reading the second light-transmitting plate 48B by the second line sensor 47B.

[0046] FIG. 5 shows an example of the luminance value when the reference plate 49 is read by the line sensor 47. In FIG. 5, the horizontal axis indicates pixels, the left end indicates the first pixel, and the right end indicates the nth pixel. n is a natural number of 2 or more. A pixel is the smallest unit of image data read by the line sensor 47. In the scanner 2, one pixel corresponds to one photoelectric conversion element of the line sensor 47. The number of pixels per inch is expressed as DPI (dots per inch). For example, when the short side of an A4 size cut sheet is read at 600 DPI, n=5100. In FIG. 5, the vertical axis indicates the luminance value of a pixel. FIG. 5 shows an example of the luminance values ​​of the first to nth pixels. Note that the first pixel and the nth pixel are not limited to the pixels at both ends of the line sensor 47. The number of pixels n can be a number that takes into account a margin for the size of the readable document M.

[0047] Among the data of the luminance value, data Ri is reference data obtained when the reference plate 49 is read by the line sensor 47 through the light-transmitting plate 48 during the manufacturing stage of the scanner 2. The variable i is a natural number from 1 to n. The reference data Ri obtained during the manufacturing stage of the scanner 2 does not include noise. In other words, the data is luminance value data obtained when the light-transmitting plate 48 is free of dirt or foreign matter. Among the data of the luminance value, data Li is data obtained when the reference plate 49 is read by the line sensor 47 through the light-transmitting plate 48 in the user's usage environment after the shipment of the scanner 2. In FIG. 5, the luminance data Li does not include noise. The luminance data Li is data for shading correction. As shown in FIG. 5, a difference may occur between the reference data Ri and the luminance data Li. However, the difference between the reference data Ri and the luminance data Li falls within a predetermined range.

[0048] FIG. 6 shows an example of the luminance value when the reference plate 49 is read by the line sensor 47. In FIG. 6, the horizontal and vertical axes, the reference data Ri, and the luminance data Li are the same as those in FIG. 5. In FIG. 6, the luminance data Li contains noise NS. One of the causes of the noise NS occurring in the luminance data Li is dirt or foreign matter adhering to the light-transmitting plate 48. When the difference between the reference data Ri and the luminance data Li falls outside a predetermined range, it can be determined that the noise NS has occurred in the luminance data Li. That is, as shown in FIG. 7, it can be determined that the noise NS has occurred in the luminance data Li based on the difference D between the reference data Ri and the luminance data Li exceeding a threshold SH.

[0049] This makes it possible to determine whether dirt or foreign matter is attached to the light-transmitting plate 48. In addition, the position where the dirt or foreign matter is attached can be identified based on the pixel number where the noise NS occurs. The threshold value SH is stored as threshold value data 56 in the memory 53 shown in FIG. 4. The reference data Ri is stored as reference data 57 in the memory 53 shown in FIG. 4.

[0050] FIG. 8 shows the flow of the noise detection process. The noise detection process is a process for detecting noise NS occurring in the luminance data Li. The noise detection process is performed by the first control unit 52 executing a noise detection method according to a noise detection program. As shown in FIG. 8, the noise detection process includes steps S1 to S8. In step S1, the first control unit 52 reads the threshold data 56 from the memory 53. Based on the threshold data 56, the threshold SH is set. Next, in step S2, the first control unit 52 reads the reference data 57 from the memory 53. Next, in step S3, the first control unit 52 controls the reading unit 25 to cause the line sensor 47 to capture the reference plate 49. At this time, the image data of the reference plate 49 captured by the line sensor 47 is temporarily stored in the memory 53.

[0051] Next, in step S4, the first control unit 52 calculates the difference D between the reference data Ri and the luminance data Li. Next, in step S5, the first control unit 52 judges whether or not the data of the difference D contains noise NS. At this time, the first control unit 52 judges the presence or absence of noise NS by judging whether or not the data of the difference D exceeds the threshold value SH. When it is judged that the data of the difference D does not contain noise NS, that is, when it is judged NO in step S5, the process proceeds to step S6. In step S6, the first control unit 52 controls the display panel 10 to cause the display panel 10 to display that the light-transmitting plate 48 is clean. After step S6, the first control unit 52 ends the noise detection process.

[0052] When it is determined in step S5 that the data of the difference D contains noise NS, that is, when the determination in step S5 is YES, the process proceeds to step S7. In step S7, the first control unit 52 identifies the location where the noise NS occurs. At this time, the first control unit 52 identifies the location where the noise NS occurs by identifying the pixel where the noise NS occurs in the data of the difference D. After step S7, in step S8, the first control unit 52 controls the display panel 10 to display a first alert image indicating that the light-transmitting plate 48 is dirty on the display panel 10. After step S8, the first control unit 52 ends the noise detection process. Note that step S3 corresponds to the reading control unit 62. Steps S5 and S7 correspond to the noise determination unit 64. Steps S6 and S8 correspond to the display control unit 63.

[0053] FIG. 9 shows an example of the first alert image 71. The first alert image 71 indicates that the light-transmitting plate 48 is dirty. The first alert image 71 includes a notification to prompt cleaning to prevent streaks caused by dirt from appearing in image data when the original M is read. The example of the first alert image 71 shown in FIG. 9 is called a first alert image 71A. The first alert image 71A includes a schematic diagram 72 that typically shows a state in which the cover 14 of the scanner 2 is opened relative to the main body 13. The schematic diagram 72 includes a first light-transmitting plate 48A and a second light-transmitting plate 48B. The first alert image 71A includes a position image 74 that identifies the position where dirt, foreign matter, etc. are occurring. The position where dirt, foreign matter, etc. are occurring is identified based on the number of a pixel where noise NS occurs in the luminance data Li.

[0054] In the first alert image 71A, the position image 74 is displayed at a relative position to the first light-transmitting plate 48A and the second light-transmitting plate 48B. A user who sees the first alert image 71A can easily grasp the cleaning positions of the first light-transmitting plate 48A and the second light-transmitting plate 48B. This makes it easy for the user to quickly clean the first light-transmitting plate 48A and the second light-transmitting plate 48B. In addition, a caution icon 75 is also displayed superimposed on the position image 74 in the first alert image 71A. The caution icon 75 visually attracts the user's attention. The caution icon 75 makes it easy for the user to quickly grasp the presence of the position image 74.

[0055] The first alert image 71A includes an information display acceptance button 77 and a continued use acceptance button 78. The information display acceptance button 77 is an example of an information display acceptance section. The continued use acceptance button 78 is an example of an approval acceptance section. The information display acceptance button 77 accepts that information regarding the cleaning of the first light-transmitting plate 48A and the second light-transmitting plate 48B is displayed. When the user selects the information display acceptance button 77, the first control unit 52 causes the display panel 10 to display information regarding the cleaning of the first light-transmitting plate 48A and the second light-transmitting plate 48B. The continued use acceptance button 78 accepts that the cleaning of the first light-transmitting plate 48A and the second light-transmitting plate 48B is skipped and the scanner 2 is used as is. When the user selects the continued use acceptance button 78, the first control unit 52 accepts that the scanner 2 is used as is.

[0056] According to the present embodiment, it is possible to display the position of the noise NS relative to the light-transmitting plate 48. This allows the user to grasp the generation position of the noise NS relative to the light-transmitting plate 48. As a result, the user can easily take measures such as cleaning the relevant portion of the light-transmitting plate 48, thereby improving user convenience.

[0057] Furthermore, according to this embodiment, it is possible to display a continued use acceptance button 78 for accepting the acceptance of the document image. The user can accept the document image via the continued use acceptance button 78 displayed on the display panel 10. This improves user convenience.

[0058] Furthermore, according to the present embodiment, it is possible to display an information display acceptance button 77 that accepts a request to display information related to cleaning of the light-transmitting plate 48. The user can view information related to cleaning of the light-transmitting plate 48 via the information display acceptance button 77 displayed on the display panel 10. This improves user convenience.

[0059] FIG. 10 shows an example of the luminance value when the original M is read by the line sensor 47. The example shown in FIG. 10 shows the average value of the luminance value read over the length of one original M along the conveying direction T. The example shown in FIG. 10 shows the luminance value when an original M having a width narrower than the array of n pixels is imaged. The luminance value changes sharply at the end E1 and end E2 of the original M. By grasping the position of the pixel where the luminance value changes sharply, the position of the original M relative to the line sensor 47 can be detected. In the example shown in FIG. 10, the original M exists between the end E1 and end E2. Note that the data of the original image when the original M is imaged may be either binary data or multi-value data. If the data of the original image when the original M is imaged is binary data, it is easy to reduce the load and time required for the detection process of the position of the original M.

[0060] By detecting the position of the original M relative to the line sensor 47, it is possible to grasp the position of the noise NS occurring in the luminance data Li relative to the original M. In other words, based on the position of the noise NS occurring in the luminance data Li and the position of the original M relative to the line sensor 47, it is possible to grasp whether or not streaks will occur in the image data when the original M is imaged. In this embodiment, it is possible to determine whether or not streaks will occur in the image data when the original M is imaged. The process of determining whether or not streaks will occur in the image data when the original M is imaged is called streak determination processing.

[0061] Fig. 11 shows the flow of the streak detection process. The streak detection process is performed by the first control unit 52 executing a streak detection method in accordance with a streak detection program. As shown in Fig. 11, the streak detection process includes steps S1 to S7 and steps S21 to S24. Steps S1 to S7 in the streak detection process are the same as steps S1 to S7 in the noise detection process shown in Fig. 8. Therefore, detailed description of the processes from steps S1 to S7 will be omitted.

[0062] As shown in FIG. 11, after step S7, in step S21, the first control unit 52 detects the document position. As described above, the detection of the document position is performed based on the luminance values ​​shown in FIG. 10. The position of the document M relative to the line sensor 47 is detected by grasping the position of a pixel where the luminance value changes sharply when the document M is read by the line sensor 47. As shown in FIG. 11, after step S21, in step S22, the first control unit 52 determines whether or not the noise NS occurring in the luminance data Li is within the range of the document M. Whether or not the noise NS is within the range of the document M is determined based on the position of the noise NS occurring in the luminance data Li and the position of the document M relative to the line sensor 47.

[0063] When it is determined that the noise NS is not within the range of the original M, that is, when the result of step S22 is NO, the process proceeds to step S23. In step S23, the first control unit 52 controls the display panel 10 to display the first alert image 71A shown in FIG. 9 on the display panel 10. Here, as shown in FIG. 11, the result of step S22 is NO when the position of the stain or foreign matter generated on the light-transmitting plate 48 is outside the range of the original M. In other words, the result of step S22 is NO means that no streaks are generated in the image data obtained when the original M is imaged. Therefore, the user can obtain the image data of the original M without wasting time required for imaging the original M. This improves the user's convenience.

[0064] When it is determined that the noise NS is within the range of the original M, that is, when the determination in step S22 is YES, the process proceeds to step S24. In step S24, the first control unit 52 controls the display panel 10 to display the second alert image on the display panel 10. After step S24, the first control unit 52 ends the streak determination process. The timing of performing the streak determination process may be any timing. For example, the streak determination process may be started based on an instruction from the user to perform the streak determination process. Also, for example, the streak determination process may be started based on an instruction from the user to perform the reading of the original M. In this case, in step S21, the first control unit 52 causes an image of the original M to be read to be captured.

[0065] FIG. 12 shows an example of the second alert image 81. The second alert image 81 indicates that streaks will occur within the range of the document M. The second alert image 81 includes a notification that alerts the user that streaks will occur due to dirt in the image data when the document M is read. The example of the second alert image 81 shown in FIG. 12 is referred to as a second alert image 81A. The second alert image 81A includes a preview image 82 of the document M. The location where the streaks 83 will occur is superimposed on the preview image 82. The preview image 82 allows the user to visually know that streaks will occur in the image of the document M. This allows the user to immediately know that streaks will occur in the image of the document M. This improves user convenience.

[0066] The streak determination process of this embodiment includes a display method for displaying a second alert image 81 on the display panel 10. The display method includes displaying the position of the noise NS relative to the document image on the display panel 10 based on detection of the presence of noise NS in the captured image captured by the line sensor 47 through the light-transmitting plate 48. The document image is an image of the document M captured by the line sensor 47. According to this display method, when noise NS occurs in the image captured by the line sensor 47, the position of the noise NS relative to the document image captured by the line sensor 47 can be displayed on the display panel 10. This makes it easier for the user to grasp the position of the noise NS relative to the document image, improving user convenience.

[0067] Note that the second alert image 81A also displays the information display acceptance button 77 and the continued use acceptance button 78. Furthermore, in the second alert image 81A, a highlight display 84 is superimposed on the preview image 82. The highlight display 84 is superimposed on the streak 83. The highlight display 84 emphasizes the location where the streak 83 has occurred. The highlight display 84 allows the user to immediately grasp the location where the streak 83 has occurred. This improves user convenience.

[0068] According to the scanner 2 of this embodiment, when noise NS occurs in an image captured by the line sensor 47, the position of the noise NS relative to the document image captured by the line sensor 47 can be displayed. This allows the user to easily grasp the position of the noise NS relative to the document image, improving user convenience. The user can grasp the influence of the noise NS on the document image. If the noise NS is in an area outside the document image, it can be determined that the influence of the noise NS is low, and it is possible to avoid capturing the document M again. In other words, even if noise NS occurs, the influence of the noise NS on the document image can be determined before selecting the next action. Avoiding capturing the document M again contributes to low energy consumption.

[0069] According to this embodiment, the display of the position of the noise NS relative to the document image displayed on the display panel 10 and the display of the continued use acceptance button 78 for accepting the consent of the document image can be displayed on the same screen. This allows the user to visually recognize the position of the noise NS relative to the document image and the continued use acceptance button 78 for accepting the consent of the document image on the same screen of the display panel 10. As a result, after the user has grasped the position of the noise NS relative to the document image, he or she can quickly accept the document image via the continued use acceptance button 78. This improves user convenience.

[0070] FIG. 13 shows an example of the second alert image 81. The example of the second alert image 81 shown in FIG. 13 is referred to as the second alert image 81B. The second alert image 81B includes a schematic diagram 72. The schematic diagram 72 is similar to the schematic diagram 72 of the first alert image 71A shown in FIG. 9, and therefore a detailed description thereof will be omitted. As shown in FIG. 13, the second alert image 81B displays a preview image 82 and the schematic diagram 72. A position image 74 and a caution icon 75 are superimposed on the schematic diagram 72. The position of the preview image 82 relative to the schematic diagram 72 corresponds to the position of the document M relative to the scanner 2.

[0071] The second alert image 81B allows the user to immediately know that streaks will occur in the image of the document M based on the preview image 82. Furthermore, the second alert image 81B allows the user to easily know the cleaning positions of the first light-transmitting plate 48A and the second light-transmitting plate 48B based on the schematic diagram 72. Furthermore, the second alert image 81B allows the user to easily know the correspondence between the positions of streaks 83 occurring in the image data and the positions of dirt or foreign matter adhering to the light-transmitting plate 48. This improves user convenience.

[0072] According to this embodiment, it is possible to display the correspondence between the position of the noise NS relative to the document image and the position of the noise NS relative to the light-transmitting plate 48. This allows the user to understand the correspondence between the position of the noise NS relative to the document image and the position of the noise NS relative to the light-transmitting plate 48. This improves user convenience.

[0073] FIG. 14 shows an example of the second alert image 81. The example of the second alert image 81 shown in FIG. 14 is referred to as the second alert image 81C. The second alert image 81C indicates that two streaks 83 have appeared in the image data. The second alert image 81C makes it easy for the user to understand the correspondence between the streaks 83 and the positions of dirt or foreign matter adhering to the light-transmitting plate 48, even when multiple streaks 83 have appeared. The correspondence can be achieved by displaying various images indicating the correspondence, such as numbers, letters, and symbols.

[0074] Fig. 15 shows an example of the second alert image 81. The example of the second alert image 81 shown in Fig. 15 is referred to as second alert image 81D. The second alert image 81D indicates that dirt or foreign matter is attached to two locations on the light-transmitting plate 48. The second alert image 81D indicates that one streak 83 will appear in the image data. The second alert image 81D allows the user to understand that the dirt or foreign matter attached to one of the two locations on the light-transmitting plate 48 corresponds to the one streak 83 that will appear in the image data.

[0075] FIG. 16 shows an example of the first alert image 71. The example of the first alert image 71 shown in FIG. 16 is referred to as the first alert image 71B. The first alert image 71B indicates that streaks 83 will not occur in the image data. The first alert image 71B indicates that dirt or foreign matter is attached to the light-transmitting plate 48. The first alert image 71B allows the user to easily know that dirt or foreign matter is attached to the light-transmitting plate 48 based on the schematic diagram 72. However, the user can easily know that streaks 83 will not occur in the image data based on the preview image 82. This improves user convenience.

[0076] FIG. 17 is a schematic diagram for explaining an example of a noise detection method. In the noise detection process, when the line sensor 47 captures an image of the reference plate 49, it is effective to project a shadow 91 of the document M or the like onto the reference plate 49. By making the leading edge 92 of the document M or the like cross the optical axis 93 of the light source 46, the shadow 91 can be projected onto an area overlapping the optical axis 94 of the line sensor 47. The light source 46 is located upstream of the line sensor 47 in the conveying direction T. The optical axis 93 of the light source 46 is inclined with respect to the optical axis 94 of the line sensor 47. As a result, when the leading edge 92 of the document M or the like reaches in front of the optical axis 94, the shadow 91 is projected onto an area overlapping the optical axis 94 of the reference plate 49.

[0077] In the image data obtained when the document M is imaged, dirt or foreign matter adhering to the light-transmitting plate 48 may appear white or black. When the reference plate 49 is white, it is difficult to detect dirt or foreign matter that is close to white. In response to this, in this embodiment, a method can be adopted in which the reference plate 49 is imaged by the line sensor 47 with a shadow 91 projected onto the reference plate 49. The shadow 91 projected onto the white reference plate 49 exhibits a gray color that is an intermediate color between white and black. For this reason, by imaging the reference plate 49 by the line sensor 47 with the shadow 91 projected onto the reference plate 49, dirt or foreign matter can be detected with high accuracy whether it is white or black.

[0078] In the above embodiment, an example has been described in which the noise detection process and the streak determination process are performed by the first control unit 52 of the scanner 2. However, the implementation of the noise detection process and the streak determination process is not limited to being performed by the first control unit 52 of the scanner 2. The noise detection process and the streak determination process may be performed by the control device 3 shown in FIG. 1. A configuration in which the noise detection process and the streak determination process are performed by a second control unit (not shown) of the control device 3 may also be applied. Furthermore, a configuration in which the noise detection process and the streak determination process are shared between the first control unit 52 of the scanner 2 and the control device 3 shown in FIG. 1 may also be applied.

[0079] In the above embodiment, an example has been described in which the first alert image 71 and the second alert image 81 are displayed on the display panel 10 of the scanner 2. However, the display of the first alert image 71 and the second alert image 81 is not limited to being displayed on the display panel 10. The first alert image 71 and the second alert image 81 can also be displayed on another display device. As the other display device, various display devices can be applied, such as a display device attached to the control device 3, a standalone monitor, a tablet terminal, a smartphone, or the like. [Explanation of symbols]

[0080] 1...image reading system, 2...scanner, 3...control device, 4...network, 10...display panel, 11...case, 12...original support, 13...main body, 14...cover, 15...supply port, 16...discharge port, 21...conveyor device, 22...multiple feed detection sensor, 22A...transmitting unit, 22B...receiving unit, 23...media detection sensor, 23A...light emitting unit, 23B...light receiving unit, 25...reading unit, 27...first control circuit, 28...conveyor path, 31...first conveyor roller pair, 31A...first drive roller, 3 1B...first driven roller, 32...second transport roller pair, 32A...second drive roller, 32B...second driven roller, 33...third transport roller pair, 33A...third drive roller, 33B...third driven roller, 34...fourth transport roller pair, 34A...fourth drive roller, 34B...fourth driven roller, 35...transport motor, 41...first scanner, 42...second scanner, 43...first surface, 44...second surface, 46A...first light source, 46B...second light source, 47...line sensor, 47A...first line sensor, 47 B...second line sensor, 48...light-transmitting plate, 48A...first light-transmitting plate, 48B...second light-transmitting plate, 49...reference plate, 49A...first reference plate, 49B...second reference plate, 51...communication interface, 52...first control unit, 53...memory, 55...control program, 56...threshold data, 57...reference data, 61...transport control unit, 62...reading control unit, 63...display control unit, 64...noise determination unit, 65...original position determination unit, 71...first alert image, 71A...first alert image, 71B...first alert image, 72...model diagram, 74...position image, 75...attention icon, 77...information display acceptance button, 78...continue use acceptance button, 81...second alert image, 81A...second alert image, 81B...second alert image, 81C...second alert image, 81D...second alert image, 82...preview image, 83...streaks, 84...highlight display, 91...shadow, 92...leading edge, 93...optical axis, 94...optical axis, M...original, T...feed direction, R...reference data, L...brightness data, NS...noise, D...difference, SH...threshold, E1...end, E2...end.

Claims

1. a transport device that transports the document along a transport path; A light-transmitting member that has light transmittance and is disposed on the transport path; an imaging device having a plurality of imaging elements arranged on the opposite side of the light-transmitting member from the transport path in a direction intersecting the transport path, the imaging device capturing an image of the document through the light-transmitting member; a control unit that causes the image capturing device to capture an image of the document while causing the transport device to transport the document; A display device for displaying information, the control unit, based on detection of the presence of noise in the image captured by the imaging device, causes the display device to display a position of the noise relative to the document image of the document captured by the imaging device. Image reading system.

2. The control unit further causes the display device to display a position of the noise relative to the light-transmitting member.

2. The image reading system according to claim 1.

3. the control unit causes the display device to display an approval accepting unit that accepts approval of the document image.

3. The image reading system according to claim 2.

4. The control unit causes the display device to display an information display receiving unit that receives information regarding cleaning of the light-transmitting member.

4. The image reading system according to claim 2 or 3.

5. the control unit causes the display device to display a position of the noise relative to the document image and a position of the noise relative to the light-transmitting member in correspondence with each other.

4. The image reading system according to claim 2 or 3.

6. the control unit causes the display of the position of the noise relative to the document image and the display of the consent acceptance unit to be displayed on the same screen.

4. The image reading system according to claim 3.

7. a white member disposed on the opposite side of the transport path from the light-transmitting member, the control unit detects the presence of the noise in the captured image based on the captured image obtained when the imaging device is caused to capture an image of the translucent member in a state in which a shadow of the document is projected onto the white member.

3. The image reading system according to claim 1 or 2.

8. the control unit identifies a position of the noise relative to the document image based on the document image of multi-value data.

2. The image reading system according to claim 1.

9. the control unit identifies a position of the noise relative to the document image based on the binary data of the document image.

2. The image reading system according to claim 1.

10. a transport device that transports the document along a transport path; A light-transmitting member that has light transmittance and is disposed on the transport path; an imaging device having a plurality of imaging elements arranged on the opposite side of the light-transmitting member from the transport path in a direction intersecting the transport path, the imaging device capturing an image of the document through the light-transmitting member; a control unit that causes the image capturing device to capture an image of the document while causing the transport device to transport the document; A display device for displaying information, the control unit, based on detection of the presence of noise in the image captured by the imaging device, causes the display device to display a position of the noise relative to the document image of the document captured by the imaging device. Image reading device.

11. and based on detection of noise in an image captured through a light-transmitting member by an imaging device having a plurality of imaging elements arranged in a direction intersecting the transport path on the opposite side of the transport path with the light-transmitting member disposed in the transport path, displaying on a display device a position of the noise relative to an original image of the original captured by the imaging device. Display method.

Images