Image reading device, image determination method, and program

Abstract

To provide an image reading device, an image determination method, and a program for easily removing and outputting a reading completion mark included in a read document.SOLUTION: In an image forming device, an image reading device 10 includes an image generation part 101 that generates a visible light irradiation image data by irradiating a document with visible light and generates invisible light irradiation image data by irradiating a document with invisible light, and a determination part 102 that determines presence or absence of a reading completion mark indicating that reading of the document is completed based on the visible light irradiation image data and the invisible light irradiation image data.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] There is known an image reading device that can read visible wavelength region information using white light and infrared wavelength region information using infrared light. Patent Document 1 discloses a technology related to an image reading device that has two light sources for reading a document, and switches between image data read by the first light source and image data read by the second light source depending on the number of documents read continuously. Summary of the Invention [Problem to be solved by the invention]

[0003] In an image reading device that stamps a read completion mark on a document that has been read, the read completion mark is also printed on a document that has failed to be sent. For example, when the document is resent, it is desirable that the printed read completion mark not be included.

[0004] The image reading device described in Patent Document 1 can prevent the disappearance of the read completion mark by switching the light source used to read the document for each page, but it cannot remove only the read completion mark that is included in only part of the page. This requires the user to visually check whether the read completion mark is included or not, and requires the user to recreate the document itself to remove the read completion mark from the document, which is an extra step.

[0005] SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an object of the present invention is to provide an image reading device that can easily remove a reading completion mark included in a read document. [Means for solving the problem]

[0006] An image reading device according to one aspect of the present invention includes an image generation unit that irradiates a document with visible light to generate visible light irradiation image data and irradiates the document with invisible light to generate invisible light irradiation image data, and a determination unit that determines whether or not a reading completion mark indicating that reading of the document has been completed is present based on the visible light irradiation image data and the invisible light irradiation image data. [Effects of the Invention]

[0007] According to the image reading device of the present invention, the reading completion mark included in the read document can be easily removed. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic diagram showing the overall configuration of an image forming apparatus including an image reading apparatus according to a first embodiment of the present invention. [Figure 2] 2 is a schematic diagram showing an automatic document feeder of the image forming apparatus shown in FIG. 1. FIG. [Figure 3] 2 is a schematic view showing a second reading and conveying section and a paper discharge section of the image forming apparatus shown in FIG. 1. [Figure 4] 1 is a configuration diagram of an image reading device according to a first embodiment of the present invention. [Figure 5] 1 is a functional configuration diagram of an image reading device according to a first embodiment of the present invention; [Figure 6] FIG. 2 is a hardware configuration diagram of a determination unit of the image reading device according to the first embodiment of the present invention. [Figure 7] FIG. 2 is a diagram showing an example of the spectral sensitivity characteristics of the image reading device according to the first embodiment of the present invention. [Figure 8] 5A and 5B are diagrams showing an example of a result of reading an original document for determining whether or not there is a reading completion mark, by the image reading device according to the first embodiment of the present invention. [Figure 9] FIG. 4 is a flowchart illustrating a process of determining whether or not a reading completion mark is present by the image reading device according to the first embodiment of the present invention. [Figure 10] FIG. 10 is a functional configuration diagram of an image reading device according to a second embodiment of the present invention. [Figure 11] 10A and 10B are diagrams for explaining extraction of a reading completion mark by an image reading device according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following describes the preferred embodiments of the present invention with reference to the accompanying drawings. In the drawings, the same components are designated by the same reference numerals, and redundant explanations may be omitted.

[0010] [First embodiment] <Overall Configuration of Image Forming Apparatus 1> 1 is a schematic diagram showing the overall configuration of an image forming apparatus 1 including an image reading device 10 according to a first embodiment of the present invention. The image forming apparatus 1 is an MFP (Multifunction Peripheral / Printer / Product) that incorporates, for example, a scanning function, a copying function, a printing function, and a facsimile function in a single housing. The image forming apparatus 1 has an output function that records a full-color image or a monochrome image on a transfer sheet, which is a recording sheet, based on input image data.

[0011] The image forming apparatus 1 may be an electrophotographic copying machine. The apparatus body 1M of the image forming apparatus 1 includes a paper feed unit 2, an image forming unit 3, and an image reading device 10. An automatic document feeder 5 (hereinafter referred to as ADF 5) is also disposed on the apparatus body 1M.

[0012] The paper feed unit 2 transports the fed transfer paper P to the stamping unit 60 of the image forming unit 3, which stamps a reading completion mark. The reading completion mark is also called a "completed" stamp. The image forming unit 3 can form an electrostatic latent image of each color based on the image read by the image reading device 10, for example. Thereafter, toner is transferred onto the electrostatic latent image, and the toner image developed on the multiple photosensitive drums 31 is primarily transferred to the primary transfer unit 32, and then the toner image is secondarily transferred to the transfer paper P at the secondary transfer unit 33 adjacent to the primary transfer unit 32.

[0013] The transfer paper P transported to the fixing section 34 has the full-color image fixed thereon by pressure and heat, and is then sent from the fixing section 34 to a pair of paper discharge rollers and discharged onto a paper discharge tray 35 outside the machine.

[0014] The first carriage 41 irradiates illumination light from a light source onto the original sheet S passing over the slit glass 45. The light that passes through the slit glass 45 and is reflected by the front surface (first side) of the original sheet S passes through mirror members mounted on the first carriage 41 and the second carriage 42, and is imaged by the imaging lens 43 on the imaging unit 44, where it is read as a front surface read image. Note that at the first reading position R, the front surface image of the original sheet S may be conjugate with the imaging unit 44 with respect to the imaging lens 43.

[0015] The abutting member 47 is provided between the slit glass 45 and the platen glass 46, and positions the document placed on the platen glass 46 by abutting it against the abutting member 47. When reading a document placed on the platen glass 46 while abutting against the abutting member 47, the first carriage 41 and the second carriage 42 move in the sub-scanning direction (left and right direction in the figure).

[0016] The first carriage 41 and the second carriage 42 move in the sub-scanning direction at a speed ratio of, for example, 2:1. Even if the first carriage 41 and the second carriage 42 move at such a speed ratio, the length of the optical path from the surface of the document to the imaging lens 43 does not change.

[0017] During the movement of each carriage 41, 42, light is irradiated onto the document from the light source, and the light reflected from the document is reflected by each mirror member mounted on each carriage 41, 42. The reflected light is focused by an imaging lens 43 and read by an imaging unit 44.

[0018] FIG. 2 is a schematic diagram showing the automatic document feeder 5 (ADF 5) of the image forming apparatus shown in FIG.

[0019] The ADF 5 is connected to the upper part of the apparatus body 1M of the image forming apparatus 1 so as to be able to open and close. The connecting means may be formed by a hinge or the like. The ADF 5 is rotated between an open position that exposes the top surfaces of the slit glass 45 and the platen glass 46 and a closed position that covers the top surfaces of the slit glass 45 and the platen glass 46.

[0020] As shown in the figure, the ADF 5 is configured as a sheet-through automatic document feeder and includes a document table 51 on which documents are placed, a document transport unit 52 including various rollers and guide members, and a document discharge tray 53 on which document sheets S are collected after image reading.

[0021] As shown in the figure, the ADF 5 also has multiple functional units arranged along the document transport path, including a document setting unit A, a separation feeding unit B, a registration unit C, a turning unit D, a first reading transport unit E, a second reading transport unit F, a paper discharge unit G, and a stack unit H.

[0022] The document setting section A is a table-like structure on which at least one cut-sheet document sheet S, for example, a stack of multiple cut-sheet documents S, can be placed. Hereinafter, the stack of document sheets S will also be simply referred to as a document stack. In the case of single-sided documents, the document stack is set with the front side facing up.

[0023] The separation and feeding unit B separates the uppermost original sheet S from the stack of originals set in the original setting unit A and feeds the separated original to the entrance of the original transport path. The registration unit C has a function of aligning the original sheets S sequentially fed from the separation and feeding unit B to a required transport posture by primary abutment, and a function of drawing out and transporting the aligned original downstream.

[0024] The turn unit D has a reverse conveying function that turns back and conveys the original sheet S drawn out and conveyed by the register unit C, and turns the surface of the original face downward in the drawing. The first reading conveying unit E conveys the original sheet S conveyed after being turned back from the turn unit D in the sub-scanning direction at a predetermined speed while passing through a reading position on the slit glass 45. The sub-scanning direction is a direction perpendicular to the main scanning direction, which is the width direction of the original.

[0025] When the original sheet S is a double-sided original, the second reading and conveying unit F main-scans the back image of the original from the upper left side in the drawing through a platen glass (not shown) downstream of the main-scanning position of the front image of the original. Then, the original sheet S is conveyed in the sub-scanning direction at a predetermined speed.

[0026] The paper discharge section G discharges the original sheets S that have been read by the first reading and conveying section E and the second reading and conveying section F to the stacking section H. The stacking section H sequentially stacks the original sheets S that are sequentially discharged from the paper discharge section G with the original surface facing downwards. The original stack is stacked in the same page order as when it was set, with the original surface facing upside down as a whole.

[0027] The document setting section A, separation feeding section B, registration section C, turning section D, first reading conveying section E, second reading conveying section F, paper discharge section G and stacking section H are controlled by a controller section (not shown) for automatic document transport control.

[0028] In this way, the ADF 5 separates the uppermost original sheets S of the originals placed on the original table 51 one by one, and transports them by the original transport unit 52 along a predetermined transport path that passes over the slit glass 45. Then, the original sheets S are read by the image reading unit 4 as they pass through the slit glass 45, and then discharged to the original discharge tray 53.

[0029] Furthermore, the image reading device 10 in the image forming apparatus 1 according to this embodiment includes a stamping unit 60 that stamps a reading completion mark at the most downstream portion of the document transport path 54 of the ADF 5 as shown in the drawing.

[0030] Fig. 3 is a schematic diagram showing the second reading and conveying section F and the paper discharge section G of the image forming apparatus shown in Fig. 1. The stamping section 60 includes a printing body 61, a support member 62 that is reciprocable in a predetermined direction, and a stamp solenoid 63 that reciprocates the support member 62 in the predetermined direction.

[0031] As shown in the figure, the stamping unit 60 is provided between the downstream conveyance roller 64 and the paper discharge roller 65, and stamps a reading completion stamp on the original sheet S after reading of the first side or the first and second sides of the original has been completed. The stamping unit 60 is composed of a stamp unit that automatically stamps a reading completion stamp in accordance with a control signal from a controller unit included in the image forming apparatus 1.

[0032] 4 is a diagram showing the configuration of an image reading device 10 according to a first embodiment of the present invention. The image reading device 10 includes a light source 11, an imaging device 12, a main body control unit 13, a light source driving unit 14, and an operation unit 15.

[0033] The light source driving unit 14 drives the light source 11. The light source 11 includes a visible light source 11a that emits visible light, which is light in the visible region, mainly red, green, and blue, and an invisible light source 11b that emits invisible light, which is light in the near-infrared region. Hereinafter, light in the near-infrared region will also be referred to as near-infrared light. The visible light may be white light. The invisible light may also be light with a longer wavelength than the near-infrared region.

[0034] The imaging device 12 includes an imaging unit 44 and a signal processing device 16. The imaging unit 44 can capture an image of an original document using wavelengths of visible light and invisible light. The imaging unit 44 receives light reflected from the original document that has been separated into visible light and invisible light for each wavelength via a color filter or the like.

[0035] The imaging unit 44 includes a first imaging unit 44a and a second imaging unit 44b. The first imaging unit 44a is a visible imaging unit that converts the main visible components of red, green, and blue into electrical signals. The second imaging unit 44b is an invisible imaging unit that converts light corresponding to wavelengths in the near-infrared region into electrical signals. The image data of the document imaged by the first imaging unit 44a is a mixture of visible and invisible components. The image data of the document imaged by the second imaging unit 44b is an invisible component.

[0036] The main body control unit 13 controls the light source driving unit 14, the imaging unit 44, the operation unit 15, and the signal processing unit 16. The signal processing unit 16 performs various signal processes on the image signal output from the imaging unit 44.

[0037] More specifically, the signal processing device 16 determines whether or not a reading completion mark indicating that reading of the document is complete is present, based on the visible light irradiation image data generated by irradiating the document with visible light and the invisible light irradiation image data generated by irradiating the document with invisible light. Furthermore, if the reading completion mark is included in the document, the signal processing device 16 outputs the invisible light irradiation image data, and if the reading completion mark is not included in the document, the signal processing device 16 outputs the visible light irradiation image data. The visible light irradiation image data and the invisible light irradiation image data are generated by reading the document as a monochrome image signal.

[0038] 5 is a functional configuration diagram of the image reading device 10 according to the first embodiment of the present invention. The image reading device 10 includes an image generating unit 101, a determining unit 102, and an output unit 103.

[0039] The image generation unit 101 may include the light source 11 and the imaging unit 44 shown in Fig. 4. The image generation unit 101 generates visible light irradiation image data by irradiating the document with visible light, and generates invisible light irradiation image data by irradiating the document with invisible light.

[0040] The determination unit 102 determines whether or not a reading completion mark is present based on the visible light irradiation image data and the invisible light irradiation image data. The visible light irradiation image data and the invisible light irradiation image data may be generated by reading an original document as a monochrome image signal.

[0041] The output unit 103 outputs invisible light irradiation image data when the reading completion mark is included in the document, and outputs visible light irradiation image data when the reading completion mark is not included in the document.

[0042] <Hardware Configuration of Determination Unit 102> 6 is a hardware configuration diagram of the determination unit 102 of the image reading device 10 according to one embodiment of the present invention. The determination unit 102 has the function of an information processing device (computer). The determination unit 102 includes a CPU (Central Processing Unit) 111, a RAM 112, a ROM (Read Only Memory) 113, and an I / O (Input / Output) 114, which are interconnected via a bus.

[0043] The CPU 111 controls the entire image reading device 10 by executing a program 115 using the RAM 112 as a work memory. The ROM 113 is a non-volatile memory such as a flash memory, and stores the program 115. The CPU 111 executes the program 115 to provide the functions described below. The I / O 114 is an input / output interface.

[0044] (Principle of reading a manuscript to determine whether or not a reading completion mark is present) 7 is a diagram showing an example of the spectral sensitivity characteristics of the image reading device 10 according to the first embodiment of the present invention. In the graph shown, the horizontal axis represents the wavelength of light, and the vertical axis represents the reflectance of light reflected from the original. The graph shown shows the difference in wavelength and reflectance characteristics between a blank original and each of K (black), Y (yellow), M (magenta), and C (cyan) toners. In the diagram, the wavelength range below 780 nm is the wavelength range of visible light, and the wavelength range of 780 nm or greater is the wavelength range of near-infrared light, which is invisible light.

[0045] Black images printed with K toner absorb light in the visible and near-infrared wavelength ranges, so their characteristics remain unchanged and their reflectance remains low. This means that black text and images on the original can be reproduced whether the original is scanned using white light or infrared light.

[0046] However, characters or images printed using a mixture of three colors of toner—cyan (C), magenta (M), and yellow (Y)—can be read in the visible light wavelength range, but all three colors transmit light in the near-infrared wavelength range, resulting in high reflectance. Therefore, the light is processed as reflected light from a blank document. A read-completion mark is imprinted as a color image, such as vermilion. Therefore, if a read-completion mark is included in the document, the invisible light irradiation image data will not include the read-completion mark, but the visible light irradiation image data will include the read-completion mark. Therefore, by comparing the visible light irradiation image data and the invisible light irradiation image data, it is possible to determine whether or not the read-completion mark is included.

[0047] FIG. 8 is a diagram showing an example of the result of reading a document by the image reading device 10 according to the first embodiment of the present invention to determine whether or not a reading completion mark M is present. In FIG. 8, (a) shows the document to be read, (b) shows visible light irradiation image data of the read document, and (c) shows invisible light irradiation image data of the read document. Also, M in the figure indicates a reading completion mark. While the reading completion mark M is a circular figure, it is not limited to this and may be in various forms such as a rectangular figure or a figure including characters.

[0048] The reading completion mark M included in the document shown in Fig. 8(a) may be vermilion, but is not limited to this and may be various colors. As shown in Fig. 8(b), the reading completion mark M is included in the document in the visible light irradiation image data. On the other hand, as shown in Fig. 8(c), the reading completion mark M is not included in the document in the invisible light irradiation image data.

[0049] Therefore, the determination unit 102 can determine whether or not the reading completion mark M is present by comparing the visible light irradiation image data and the invisible light irradiation image data. If the reading completion mark M is included in the document, the output unit 103 outputs the invisible light irradiation image data. By outputting the invisible light irradiation image data, it is possible to output the document before the reading completion mark M is imprinted, with only the reading completion mark M included in part of the document removed. Furthermore, if the reading completion mark M is not included in the document, the output unit 103 can output the visible light irradiation image data.

[0050] The light used as invisible light is not limited to near-infrared light, but can also be far-infrared light (wavelength 1000 nm or longer), which is light with a longer wavelength than the near-infrared region. In this case, an image similar to that shown in Figure 8(c) can be obtained.

[0051] Note that when the imaging unit 44 is made of silicon, which is commonly used as an imaging element, it has sensitivity in the near-infrared region of approximately 750 nm to 1100 nm. Therefore, with a configuration like the image reading device 10 according to this embodiment, there is no need to prepare a special reading device to read the reading completion mark M; instead, the imaging unit of a scanner installed in a general multifunction peripheral can be used. Furthermore, with a configuration like the image reading device 10 according to this embodiment, the reading completion mark M is removed, so it can be said that the difficulty of implementation is low, even when considering the risk of adverse effects on the human body, for example.

[0052] FIG. 9 is a flowchart illustrating a process of determining whether or not the reading completion mark M is present by the image reading device 10 according to the first embodiment of the present invention.

[0053] When the document is read as a monochrome image signal (Yes in step S201), the image generation unit 101 irradiates the document with visible light to generate visible light irradiation image data, and also irradiates the document with invisible light to generate invisible light irradiation image data (step S202). The determination unit 102 determines whether or not a reading completion mark M is present based on the visible light irradiation image data and the invisible light irradiation image data (step S203).

[0054] If the reading completion mark M is included in the document (Yes in step S204), the output unit 103 outputs the invisible light irradiation image data (step S205). If the reading completion mark M is not included in the document (No in step S204), the output unit 103 outputs the visible light irradiation image data (step S206).

[0055] When the document is read using a signal other than a monochrome image signal (No in step S201), the image generating unit 101 generates visible light irradiation image data by irradiating the document with visible light (step S207).

[0056] When determining whether or not the reading completion mark M is present based on the visible light irradiation image data and the invisible light irradiation image data, the determination unit 102 may perform an exclusive OR (XOR) operation on both sets of image data.

[0057] The exclusive OR results in 0 if the comparison values ​​are the same, and 1 if they are different. The determination unit 102 utilizes this feature to perform an exclusive OR on the visible light irradiation image data and the invisible light irradiation image data on a pixel-by-pixel basis, thereby determining whether or not there are any differences between the two sets of image data. In other words, if the document contains a reading completion mark M, the determination unit 102 can determine whether or not there is a reading completion mark M, since only the reading completion mark M remains.

[0058] The determination unit 102 may compare the visible light irradiation image data and the invisible light irradiation image data on a pixel-by-pixel basis, and if there is no difference in pixel units, determine that the document does not include the reading completion mark M. Alternatively, the determination unit 102 may determine whether the document includes the reading completion mark M by setting a threshold value for the number of pixels for the difference in pixel units between both image data.

[0059] For example, if the document is A4 size and the number of pixels is 7016 (dot)×4961 (dot)=34,806,376 (dot), then 0.01% of this number can be set as the threshold value.

[0060] At this time, when the visible light irradiation image data and the invisible light irradiation image data are compared pixel by pixel and there is a difference of 3,480 (dot) or more pixels, the determination unit 102 may determine that the document contains the reading completion mark M. Alternatively, the determination unit 102 may determine that the document does not contain the reading completion mark M if the difference in pixels between both image data is less than 3,480 (dot).

[0061] The image reading device 10 according to this embodiment reads an original document using visible light and invisible light simultaneously, and can determine whether or not a reading completion mark M is stamped on the original document. The image reading device 10 can then select an original document to output based on the determination result of the presence or absence of the reading completion mark M. Therefore, the image reading device 10 according to this embodiment can easily remove the reading completion mark M included in the original document that has been read.

[0062] [Second embodiment] <Functional Configuration of Image Reading Device 10> 10 is a functional configuration diagram of an image reading device 10 according to a second embodiment of the present invention. As with the first embodiment, the image reading device 10 includes an image generation unit 101, a determination unit 102, an output unit 103, and an extraction unit 104. The image generation unit 101, the determination unit 102, and the output unit 103 are the same as those in the image reading device 10 according to the first embodiment. In the following, the same components as those already described are denoted by the same reference numerals, and duplicated descriptions will be omitted.

[0063] The extraction unit 104 extracts a reading completion mark based on the visible light irradiation image data and the invisible light irradiation image data. At this time, the determination unit 102 determines whether the reading completion mark extracted by the extraction unit 104 is included in the document. The extraction of the reading completion mark performed by the extraction unit 104 will be described in more detail below.

[0064] 11 is a diagram for explaining extraction of a reading completion mark M by the image reading device 10 according to the second embodiment of the present invention. In FIG. 11, (a) shows the document to be read, (b) shows the reading completion mark M included in the visible light irradiation image data of the read document, and (c) shows the reading completion mark M extracted by the extraction unit 104. The aspect of the reading completion mark M is the same as that described using FIG. 8.

[0065] 11(a), the determination unit 102 determines that the document includes a reading completion mark M by comparing the visible light irradiation image data and the invisible light irradiation image data. In the following, the region R1 is assumed to be a rectangle of dimensions a × b.

[0066] For example, in Figure 11(a), if a and b are each 2 cm, the judgment unit 102 judges whether or not the reading completion mark M is present in an area R1 that is 2 cm from the bottom edge of the document in the sub-scanning direction and 2 cm in front and behind the center of the document in the main scanning direction.

[0067] In Fig. 11(b), g and g1 are pixels included in region R1. In the image data in which only the read-completion mark M remains, the extraction unit 104 extracts the read-completion mark M from region R1 of 2 cm x 2 cm from the center of the bottom edge of the document, as shown in Fig. 11(b), by performing an exclusive OR. The extraction unit 104 further extracts the extracted read-completion mark M on a pixel-by-pixel basis and trims the margins.

[0068] More specifically, the extraction unit 104 extracts the reading completion mark M from the visible light irradiation image data and the invisible light irradiation image data based on the pixel value of each pixel g. When the reading completion mark M is partially included, for example, in pixel g1, the extraction unit 104 may determine that the reading completion mark M is included or not included. Alternatively, the extraction unit 104 may set a threshold value for the pixel value of pixel g1 and determine whether the reading completion mark M is included or not based on the threshold value.

[0069] The extraction unit 104 may determine that a pixel g that does not include the reading completion mark M is a blank space and trim the blank space to extract the reading completion mark M. As a result, the extraction unit 104 can extract the reading completion mark M from an area R2 that is narrower than the area R1, as shown in FIG. 11(c).

[0070] The presence or absence of differences between the visible light irradiation image data and the invisible light irradiation image data is determined by performing an exclusive OR operation on each pixel of the image data. If the document contains, for example, notes or stains in addition to the reading completion mark M, the determination unit 102 may erroneously determine whether or not the reading completion mark M is present.

[0071] According to the image reading device 10 of this embodiment, it is possible to compare only the reading completion marks M included in the visible light irradiation image data and the invisible light irradiation image data. Therefore, even if the document contains chromatic stains, notes, or the like in a position other than the reading completion mark M, it is possible to prevent the determination unit 102 from erroneously determining whether the reading completion mark M is present.

[0072] Although the embodiments have been described above, the present invention is not limited to the above-described embodiments, and various modifications and improvements are possible within the scope of the present invention.

[0073] Each function of the above-described embodiments can be realized by one or more processing circuits. Here, the term "processing circuit" in this specification includes a processor programmed to perform each function by software, such as a processor implemented by an electronic circuit, as well as devices such as an ASIC (Application Specific Integrated Circuit), a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), and conventional circuit modules designed to perform each of the above-described functions.

[0074] For example, aspects of the present invention are as follows. <1> an image generating unit that generates visible light irradiation image data by irradiating a document with visible light and generates invisible light irradiation image data by irradiating the document with invisible light; a determination unit that determines whether or not a reading completion mark indicating that reading of the document has been completed is present based on the visible light irradiation image data and the invisible light irradiation image data; An image reading device comprising: <2> an output unit that outputs the invisible light irradiation image data when the reading completion mark is included in the document, and outputs the visible light irradiation image data when the reading completion mark is not included in the document; The aforementioned <1> 2. The image reading apparatus according to claim 1 . <3> the visible light irradiation image data and the invisible light irradiation image data are generated by reading the document as a monochrome image signal; The aforementioned <1> or the above <2> 2. The image reading apparatus according to claim 1 . <4> The visible light is white light, and the invisible light is light in the near-infrared region. The aforementioned <1> From the above <3> 10. The image reading device according to claim 9, wherein: <5> The invisible light irradiation image data is generated by irradiating light having a wavelength longer than that of the near-infrared region. The aforementioned <1> From the above <4> 10. The image reading device according to claim 9, wherein: <6> an extracting unit that extracts a reading completion mark based on the visible light irradiation image data and the invisible light irradiation image data; The determination unit determining whether the reading completion mark extracted by the extraction unit is included in the document; The aforementioned <1> From the above <5> 10. The image reading device according to claim 9, wherein: <7> An image evaluation method performed by an image reading device, comprising: generating visible light irradiation image data by irradiating a document with visible light, and generating invisible light irradiation image data by irradiating the document with invisible light; determining whether or not a reading completion mark indicating that reading of the document has been completed is present based on the visible light irradiation image data and the invisible light irradiation image data; An image judgment method including: <8> A program for causing an image reading device to function, A process of irradiating a document with visible light to generate visible light irradiation image data and irradiating the document with invisible light to generate invisible light irradiation image data; a process of determining whether or not a reading completion mark indicating that reading of the document has been completed is present based on the visible light irradiation image data and the invisible light irradiation image data; A program to execute. [Explanation of symbols]

[0075] 10 Image reader 101 Image generation unit 102 Judgment section 103 Output section 104 Extraction part M Reading complete mark [Prior art documents] [Patent documents]

[0076] [Patent Document 1] Japanese Patent Publication No. 2021-197693

Claims

1. an image generating unit that generates visible light irradiation image data by irradiating a document with visible light and generates invisible light irradiation image data by irradiating the document with invisible light; a determination unit that determines whether or not a reading completion mark indicating that reading of the document has been completed is present based on the visible light irradiation image data and the invisible light irradiation image data; An image reading device comprising:

2. an output unit that outputs the invisible light irradiation image data when the reading completion mark is included in the document, and outputs the visible light irradiation image data when the reading completion mark is not included in the document; 2. The image reading device according to claim 1.

3. the visible light irradiation image data and the invisible light irradiation image data are generated by reading the document as a monochrome image signal; 2. The image reading device according to claim 1.

4. The visible light is white light, and the invisible light is light in the near-infrared region.

2. The image reading device according to claim 1.

5. The invisible light irradiation image data is generated by irradiating light having a wavelength longer than that of the near-infrared region.

2. The image reading device according to claim 1.

6. an extracting unit that extracts a reading completion mark based on the visible light irradiation image data and the invisible light irradiation image data; The determination unit determining whether the reading completion mark extracted by the extraction unit is included in the document; 2. The image reading device according to claim 1.

7. An image evaluation method performed by an image reading device, comprising: generating visible light irradiation image data by irradiating a document with visible light, and generating invisible light irradiation image data by irradiating the document with invisible light; determining whether or not a reading completion mark indicating that reading of the document has been completed is present based on the visible light irradiation image data and the invisible light irradiation image data; An image judgment method comprising:

8. A program for causing an image reading device to function, A process of irradiating a document with visible light to generate visible light irradiation image data and irradiating the document with invisible light to generate invisible light irradiation image data; a process of determining whether or not a reading completion mark indicating that reading of the document has been completed is present based on the visible light irradiation image data and the invisible light irradiation image data; A program to execute.

Images