Image inspection device, image inspection method, program, and image forming system

Abstract

To perform image inspection on a surface as a target suitable as a surface for reading an image.SOLUTION: An image inspection apparatus according to an aspect of the present invention includes: a first reading unit 211 which reads a first surface which is one surface of a recording member; a second reading unit 212 for reading a second surface which is the other surface of the recording member; a control unit 20 for selecting either of, on the basis of content of a print job for instructing printing of an image on the recording member, a first reading mode in which the first reading part reads an image formed on a first surface of the recording member or a second reading mode in which the second reading unit reads an image formed on the first surface of the recording member; and an image inspection unit 22 for inspecting a read image read by the first reading unit 211 or a read image read by the second reading part 212.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an image inspection device and an image inspection method. 、 program and image forming system Regarding. [Background technology]

[0002] Conventionally, image forming apparatuses or image inspection apparatuses may perform image inspections for the purpose of inspecting the image quality of printed matter, such as the presence or absence of streaks, checking for the presence or absence of dirt, such as dust, etc. For example, Patent Document 1 discloses an image forming apparatus equipped with an image inspection device that compares image data obtained by reading an image on a generated printed matter with original image data for generating the printed matter to determine the presence or absence of defects in the image on the printed matter. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-216076 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in printing mainly for label paper, the order of ink (or toner) overlap is reversed in order to protect the printed surface. Specifically, the ink to be placed on the top surface of the finished label is first applied to the front surface of the transparent substrate (the back surface of the finished label), then the ink to be placed on the lower layer is applied, and finally the background ink to be placed on the bottom layer is applied. Then, in a post-printing process, the layer with the printed background is adhered to a release paper via an adhesive, completing the label.

[0005] When an image inspection is performed on the printed surface of such a printed matter, the image that is read in the image inspection is the background image. In other words, if an image inspection is simply performed on the printed surface, it is not possible to perform an image inspection on the image viewed from the front side of the transparent substrate.

[0006] The present invention has been made in view of the above circumstances, and an object of the present invention is to enable image inspection to be performed on a surface that is appropriate as a surface from which an image is read. [Means for solving the problem]

[0007] In order to solve the above problems, an image inspection device according to one aspect of the present invention includes an image inspection unit that inspects a first read image obtained by reading a recording member having an image formed on a first surface from the first surface side. and a control unit; An image inspection device having The control unit: The recording member is a transparent base material, and has an image on the first surface and The highest The background is formed on It was determined that In case, The image inspection department is The second scanned image is scanned from the second side, which is the opposite side to the first side. Investigate do. Effect of the Invention

[0008] Books According to the present invention, it is possible to carry out image inspection on a surface that is appropriate as a surface for reading an image. Problems, configurations, and effects other than those described above will become apparent from the following description of the embodiments. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic diagram showing an overall configuration of an image forming system according to an embodiment of the present invention; [Diagram 2] 1 is a block diagram showing an example of the configuration of a control system of an image forming apparatus and an image inspection apparatus according to an embodiment of the present invention; [Diagram 3]FIG. 13 is a side view of a sheet on which printing has been performed with the ink overlap order reversed according to an embodiment of the present invention. [Figure 4] 5 is a flowchart showing an example of a procedure of image inspection processing by an image inspection device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In this specification and the drawings, components having substantially the same functions or configurations are denoted by the same reference numerals, and duplicated descriptions of the components will be omitted.

[0011] <Image forming system configuration> First, the overall configuration of an image forming system according to one embodiment of the present invention will be described with reference to Fig. 1. Fig. 1 is a schematic diagram showing the overall configuration of an image forming system 1000. Note that Fig. 1 shows elements necessary for explaining the present invention or related elements, and the image forming system of the present invention is not limited to the example shown in Fig. 1.

[0012] As shown in FIG. 1, an image forming system 1000 includes an image forming apparatus 1, an image inspection apparatus 2, and a paper discharge apparatus 3.

[0013] [Configuration of image forming device] The image forming apparatus 1 is an image forming apparatus that forms an image on a sheet Sh (an example of a recording material) using an inkjet method, and forms (prints) an image on the first side of the first and second sides of the sheet Sh based on a print job input from a terminal device or the like not shown.

[0014] As shown in FIG. 1, image forming apparatus 1 includes operation display unit 11, paper feed tray 13A, manual feed tray 13B, transport path 14, and image forming unit 100. In the example shown in FIG.

[0015] The operation display unit 11 is configured as a touch panel in which a touch sensor as an operation input unit is superimposed on a display unit made of an LCD (Liquid Crystal Display) or an organic EL (Electro Luminescence) display. In the present embodiment, an example in which the display unit and the operation input unit are integrally formed has been given, but the present invention is not limited to this. The operation input unit using buttons, keys, etc. and the display unit using an LCD, etc. may be configured separately.

[0016] The paper feed tray 13A is a tray that accommodates sheets Sh on which an image is formed by the image forming unit 100. The manual feed tray 13B is a tray attached to the side of the housing of the image forming apparatus 1, into which the user inserts paper (special paper) of a size or type that is not accommodated in the paper feed tray 13A.

[0017] The conveying path 14 is a path for conveying the sheet Sh fed from the paper feed tray 13A or the manual feed tray 13B to the paper discharge tray 31a or the purge tray 31b of the paper discharge device 3 via the image inspection device 2. A plurality of conveying rollers for conveying the sheet Sh are provided on the conveying path 14. The conveying path 14 is provided with a double-sided path 141 and a path 142 for sending the sheet Sh, on which an image has been formed by the image forming unit 100, to the image forming unit 100 without reversing it.

[0018] The image forming section 100 includes a print head 17 and a fixing section 18, and forms (prints) an image on a first surface of a first surface and a second surface of the sheet Sh. The head unit 17 includes a head unit 171W, a head unit 171Y, a head unit 171M, a head unit 171C, and a head unit 171K. The head unit 171W is a unit that ejects white (W) ink, and the head unit 171Y is a unit that ejects yellow (Y) ink. The head unit 171M is a unit that ejects magenta (M) ink, and the head unit 171C is a unit that ejects cyan (C) ink. The head unit 171K is a unit that ejects black (K) ink.

[0019] Each of the head units 171W, 171Y, 171M, 171C, and 171K includes a recording head (not shown) having a plurality of nozzles. An image is formed on the sheet Sh by ejecting ink droplets from the plurality of nozzles. In the following description, when there is no need to distinguish between the head units 171W, 171Y, 171M, 171C, and 171K, they will be collectively referred to as head unit 171.

[0020] 1, the head units 171 are arranged in the order of white, yellow, magenta, cyan, and black from the upstream side in the conveying direction of the sheet Sh, but the present invention is not limited to this. For example, the order of magenta and cyan may be reversed, and white may be arranged downstream of black.

[0021] The fixing unit 18 is disposed downstream of the head unit 171K in the transport direction of the sheet Sh. The fixing unit 18 irradiates ultraviolet light onto the sheet Sh on which ink has been applied by the print head 17, and cures the ink adhering to the sheet Sh, thereby fixing the image onto the sheet Sh.

[0022] When an image corresponding to a print job is composed of two layers, the image forming unit 100 performs image formation, for example, as follows. First, the head unit 171Y, the head unit 171M, the head unit 171C, and the head unit 171K form an image corresponding to the layers other than the base on the sheet Sh, and the fixing unit 18 hardens the ink. Thereafter, the sheet Sh is sent again to the image forming unit 100 along the path 142, the head unit 171W forms an image on the hardened ink, and the fixing unit 18 hardens the white ink. In the above example, an image is formed with yellow, magenta, cyan, and black inks in the first image formation, and an image is formed with white ink in the second image formation, but the number of times of image formation and the ink (color material) used in each image formation are not limited thereto.

[0023] In the above example, the sheet Sh on which an image has been formed is sent again to the image forming unit 100 via path 142, but the sheet Sh on which an image has been formed can also be inserted by the user into the topmost level of the paper feed tray 13A or into the manual feed tray 13B, thereby allowing an image to be formed again.

[0024] [Image inspection device configuration] The image inspection device 2 includes a first reading unit 211 and a second reading unit 212. The first reading unit 211 and the second reading unit 212 are configured with scanners that read an image formed on a sheet Sh. The first reading unit 211 is disposed above the transport path 14 in FIG. 1 (on the first surface side of the sheet Sh transported on the transport path 14) and reads the first surface of the sheet Sh transported from the image forming device 1. The second reading unit 212 is disposed below the transport path 14 in FIG. 1 (on the second surface side of the sheet Sh transported on the transport path 14) and reads the second surface of the sheet Sh transported from the image forming device 1.

[0025] Then, the image inspection device 2 performs image inspection on the image read by the first reading unit 211 (hereinafter also referred to as the "first read image") or the image read by the second reading unit 212 (hereinafter also referred to as the "second read image") to check whether the image has any dust or dirt, whether streaks, etc. The image inspection device 2 performs image inspection by checking whether the first read image (an example of a read image) or the second read image (an example of a read image) matches the reference image (original image).

[0026] The paper discharge device 3 includes a paper discharge tray 31a and a purge tray 31b. The paper discharge tray 31a is a tray onto which sheets Sh for which no abnormality has been detected by the image inspection device 2 are discharged. The purge tray 31b is a tray onto which sheets Sh for which an abnormality has been detected by the image inspection device 2 are discharged.

[0027] 1, there is one fixing unit 18 for the multiple head units 171Y, 171M, 171C, and 171K, but the present invention is not limited to this. A fixing unit 18 may be provided individually for each of the head units 171Y, 171M, 171C, and 171K.

[0028] <Configuration of the control system of the image forming device and the image inspection device> Next, the configuration of the control system of the image forming apparatus 1 and the image inspection apparatus 2 will be described with reference to Fig. 2. Fig. 2 is a block diagram showing an example of the configuration of the control system of the image forming apparatus 1 and the image inspection apparatus 2.

[0029] [Configuration of the control system of the image forming device] As shown in FIG. 2, the image forming apparatus 1 includes a control unit 10, a storage unit 104, an operation display unit 11, a communication unit 12, a transport control unit 15, a halftone processing unit 16, and an image forming unit 100.

[0030] The control unit 10 includes a CPU (Central Processing Unit) 101, a RAM (Random Access Memory) 102 used as a working area for the CPU 101, and a ROM (Read Only Memory) 103 for storing programs executed by the CPU 101, etc.

[0031] The CPU 101 of the control unit 10 is connected to each part constituting the image forming apparatus 1 via a system bus B1, and controls the operation of each part. For example, the CPU 101 performs control to form an image on a sheet Sh fed from the paper feed tray 13A or the manual feed tray 13B based on a print job input from a terminal device (not shown). When the sheet Sh is a transparent substrate for a label, the CPU 101 controls the image forming unit 100 to form a mirror image of the document image corresponding to the print job on the sheet Sh by reversing the ink overlap order.

[0032] The storage unit 104 is a large-capacity storage device including a hard disk drive (HDD), a solid state drive (SSD), etc. The storage unit 104 stores an original image, data on the amount of ink droplets discharged from a group of multiple nozzles (not shown) of the head unit 171 (ink discharge amount data), and the like.

[0033] The operation display unit 11 has already been described with reference to Fig. 1, and therefore description thereof will be omitted here. The communication unit 12 transmits and receives various control signals and data between the image inspection device 2. For example, the communication unit 12 transmits the setting contents of a print job to the image inspection device 2.

[0034] The conveyance control unit 15 controls the conveyance operation of the sheet Sh in the conveyance path 14. The halftone processing unit 16 performs color conversion processing on the original image (image data) and performs halftone processing such as dither processing and error diffusion processing to reduce the number of gradations of each pixel of the image data to the number of gradations that can be represented by the image forming unit 100.

[0035] The image forming section 100 includes a print head 17 and a fixing section 18. The print head 17 includes a head unit 171 and a head control section 172. The head unit 171 has already been described with reference to FIG. 1, and therefore its description will be omitted here. The head control section 172 controls the ink ejection operation by the head unit 171. The fixing section 18 has also been described with reference to FIG. 1, and therefore its description will be omitted here.

[0036] [Configuration of the control system of the image inspection device] As shown in FIG. 2, the image inspection device 2 includes a control unit 20, a storage unit 204, an image reading unit 21, an image inspection unit 22, and a communication unit 23.

[0037] The control unit 20 includes a CPU 201, a RAM 202 used as a working area for the CPU 201, and a ROM 203 for storing programs executed by the CPU 201, etc.

[0038] The CPU 201 of the control unit 20 is connected to each unit constituting the image inspection device 2 via a system bus B2, and controls the operation of each unit. For example, the CPU 201 performs control to switch between a first reading mode in which the first reading unit 211 reads a sheet Sh having an image printed on its first side, and a second reading mode in which the second reading unit 212 reads a sheet Sh having an image printed on its first side, based on the contents of a print job.

[0039] Specifically, in a print job, when the reading side of the sheet Sh in the image inspection device 2 is set to the "second side," the CPU 201 selects the second reading mode and causes the second reading unit 212 to read the sheet Sh with an image printed on its first side. The setting to set the reading side of the sheet Sh to the "second side" is performed by the user, for example, when printing for a label in which the ink overlap order is reversed. Alternatively, the CPU 101 may select the second reading mode when the print job instructs the image forming unit 100 to form a mirror image of the document image.

[0040] Furthermore, when performing an image inspection by having the second reading unit 212 read the sheet Sh having an image formed on its first surface, the CPU 201 controls the image inspection unit 22 to compare a mirror image of the reference image with the second read image. Alternatively, the CPU 201 controls the image inspection unit 22 to compare a (non-mirrored) reference image with a mirror image of the second read image.

[0041] The first reading unit 211 and the second reading unit 212 are each composed of, for example, a line sensor in which a plurality of detection elements are arranged in a direction perpendicular to the conveyance direction of the sheet Sh (the width direction of the sheet Sh). The first reading unit 211 can read a first surface of the sheet Sh, and outputs the read first read image to the control unit 20. The second reading unit 212 can read a second surface of the sheet Sh, and outputs the read second read image to the control unit 20.

[0042] The image inspection unit 22 performs image inspection on the first read image or the second read image to check whether the image has dust or dirt, whether streaks, etc. The image inspection unit 22 performs image inspection by checking whether the first read image or the second read image matches a reference image.

[0043] The communication unit 23 is connected to the image forming apparatus 1, and receives print jobs, various control signals, various data, and the like transmitted from the communication unit 12 of the image forming apparatus 1.

[0044] <Example of scanning a sheet printed with the ink layer order reversed> Next, an example of reading a sheet Sh on which printing has been performed with the ink overlapping order reversed, by the second reading unit 212, will be described with reference to Fig. 3. Fig. 3 is a side view of a sheet Sh on which printing has been performed with the ink overlapping order reversed.

[0045] In the example shown in Fig. 3, yellow ink Iy is first applied onto label sheet Sh made of a transparent base material, and magenta ink Im, cyan ink Ic, and black ink Ik are then applied in that order. Finally, white ink Iw is applied as a background. In the subsequent process, release paper Pr is adhered to the white ink Iw via adhesive material (glue) P, completing the label. In the finished label, the sheet Sh made of a transparent base material becomes the top surface, and the release paper Pr becomes the bottom surface.

[0046] However, in the example shown in FIG. 3, when the printed surface is read from the first surface side in the image inspection, the read image is a background image composed of white ink Iw. In other words, the image formed on the first surface of the label cannot be properly inspected. Therefore, in this embodiment, even when inspecting the image formed on the first surface of a sheet Sh printed with the inks printed in the reversed order, the second reading unit 212 (see FIG. 2) reads from the direction indicated by the white arrow in FIG. 3 under the control of the control unit 20. This makes it possible to perform image inspection on the image from the direction in which the finished label can be seen.

[0047] <Image inspection method using an image inspection device> Next, an image inspection method using the image inspection device 2 according to this embodiment will be described with reference to Fig. 4. Fig. 4 is a flowchart showing an example of the procedure of image inspection processing using the image inspection device 2.

[0048] First, the control unit 20 of the image inspection device 2 determines whether or not image inspection of the printed matter on which an image is formed by the image forming device 1 is necessary (step S1). Whether or not image inspection is necessary can be determined based on, for example, the contents of the print job transmitted from the image forming device 1, whether or not a control signal instructing image inspection transmitted from the image forming device 1 has been received, etc.

[0049] If it is determined in step S1 that image inspection is not necessary (if step S1 is a NO judgment), the control unit 20 ends the process related to image inspection. On the other hand, if it is determined in step S1 that image inspection is necessary (if step S1 is a YES judgment), the control unit 20 determines whether or not the reading side of the sheet Sh is set to the second side in the setting contents of the print job (step S2). If it is determined in step S2 that the reading side of the sheet Sh is set to the second side (if step S2 is a YES judgment), the control unit 20 selects the second reading mode and causes the second reading unit 212 (see FIG. 1 and FIG. 2) to read the second side of the sheet Sh (step S3).

[0050] On the other hand, if it is determined in step S2 that the reading side of the sheet Sh is not set to the second side (if step S2 is determined to be NO), the control unit 20 selects the first reading mode and causes the first reading unit 211 to read the first side of the sheet Sh (step S4). After the process of step S3 or the process of step S4, the image inspection unit 22 performs image inspection based on the second read image read in step S3 or the first read image read in step S4 (step S5).

[0051] In the above-described embodiment, when the user sets the reading side of the sheet Sh to the second side, the second reading unit 212 of the image inspection device 2 reads the second side of the sheet Sh. Then, in the image inspection unit 22 of the image inspection device 2, inspection is performed based on the second read image read by the second reading unit 212. On the other hand, during normal printing or the like, when the reading side of the sheet Sh is not set to the second side, the first reading unit 211 of the image inspection device 2 reads the first side of the sheet Sh. Then, in the image inspection unit 22 of the image inspection device 2, inspection is performed based on the first read image read by the first reading unit 211. Therefore, according to this embodiment, it is possible to perform image inspection targeting a surface that is appropriate as a surface for reading an image.

[0052] If step S2 is judged as YES, the control unit 20 may also judge whether the type of the sheet Sh is a transparent base material or not, and if the sheet Sh is a transparent base material, control the second reading unit 212 to read the second side of the sheet Sh. By performing such control, it is possible to prevent erroneous reading from the second side from being performed when the user mistakenly sets the reading side to the second side even though reading from the second side is not necessary.

[0053] 4, an example has been given in which either the first reading unit 211 or the second reading unit 212 reads the sheet Sh based on the reading side setting made by the user, but the present invention is not limited to this. Even when the reading side setting is "Auto", the control unit 20 of the image inspection device 2 may select the reading side of the sheet Sh (select either the first reading mode or the second reading mode) based on the contents of the print job.

[0054] For example, the control unit 20 of the image inspection device 2 may focus on layer information in the data structure of the image written in the print job and determine the reading surface of the sheet Sh based on the image information of the layer. Specifically, when the topmost layer, i.e., the image printed last (the image printed on the bottom layer in the finished label) is made of white ink Iw (white color), the control unit 20 may cause the second reading unit 212 to execute reading.

[0055] At this time, when the image on the top layer is made of white ink Iw and another image exists on a layer below the top layer, the control unit 20 may execute reading by the second reading unit 212. The existence of another image on a layer below the top layer means that an image made of white ink Iw is superimposed on a pattern of some kind.

[0056] Furthermore, when the rate at which the image of the top layer (image of white ink Iw) covers other images in layers below the top layer (coverage rate) is equal to or greater than a predetermined threshold, the control unit 20 may execute reading by the second reading unit 212. The higher the coverage rate at which the image of the top layer covers other images in layers below the top layer, the higher the probability that the image of the top layer is a background image.

[0057] In addition, when the attribute of the image (object) of the top layer is not text, i.e., when it is an image or a graphic, the control unit 20 may execute reading by the second reading unit 212. When the attribute of the image of the top layer is text, even if the image is made of white ink Iw, it is considered to be white characters rather than a background. Therefore, in such a case, image inspection of the image including the text should be performed, so it is desirable for the control unit 20 to execute reading by the first reading unit 211.

[0058] Furthermore, if the shape of the image (object) on the top layer is irregular, the control unit 20 may cause the first reading unit 211 to read it. For example, if a part of any side constituting the object on the top layer is deeply embedded inward or the center of the object is hollowed out, the object is considered to be an elaborately designed picture (design). In other words, since it can be determined that the object is not a background image, in such a case, it is desirable for the control unit 20 to cause the first reading unit 211 to read it.

[0059] The more the number of the above-mentioned determinations that are combined, the more the accuracy of determining whether the printing surface is appropriate can be improved. However, the accuracy of determining whether the printing surface is appropriate can also be improved by performing any one of the above-mentioned determinations in addition to the determination in step S2 of FIG.

[0060] In the above-described embodiment, when the reading surface of the sheet Sh is set to the second surface, or when it is determined that reading from the second surface is appropriate, and the image inspection device 2 performs image inspection by comparison with a reference image, the control unit 20 of the image inspection device 2 controls the image inspection unit 22 to compare a mirror image of the reference image with the first read image, or controls the image inspection unit 22 to compare the reference image with a mirror image of the first read image.

[0061] For example, when printing is performed with the ink overlap order reversed, the image forming unit 100 forms a mirror image of the original image on the sheet Sh under the control of the control unit 10. This is because it is assumed that the finished label will be viewed from the side (second side) opposite to the printed side (first side), so that the image viewed from the second side will be a normal image. Therefore, when printing is performed in this manner, the orientation of the read image (first read image) will not match the orientation of the original image used as the reference image.

[0062] In contrast, according to the present embodiment described above, a comparison is made between the mirror image of the reference image and the first read image, or between the reference image and the mirror image of the first read image, making it possible to accurately compare the images.

[0063] The present invention can also be applied to a case where the first surface of a sheet Sh, whose second surface has been printed, is printed in a reversed ink overlap order. In this case, the second reading unit 212 reads the image formed on the second surface and the image formed on the first surface.

[0064] In addition, when printing is performed on the first side of a sheet Sh after printing has been performed on the second side, with the ink overlap order reversed, it is preferable for the image inspection unit 22 to use a composite image of the original image corresponding to the second side and the original image corresponding to the first side as the reference image.

[0065] <Various modified examples> The present invention is not limited to the above-described embodiment, and various other applications and modifications are possible without departing from the gist of the present invention as defined in the claims.

[0066] In the above-described embodiment, an example has been given in which the image forming apparatus 1 and the image inspection apparatus 2 are configured in separate housings, but the present invention is not limited to this. The image inspection apparatus 2 may be formed inside the image forming apparatus 1. In other words, the image inspection apparatus 2 may be formed integrally with the image forming apparatus 1. In this case, the control performed in the control unit 20 of the image inspection apparatus 2 may be performed in the control unit 10 of the image forming apparatus 1.

[0067] In the above embodiment, the recording member on which the image inspection device 2 performs image inspection is the sheet Sh, but the present invention is not limited to this. The recording member may be a roll wound into a cylindrical shape.

[0068] In the above embodiment, the image forming apparatus of the present invention is applied to the inkjet type image forming apparatus 1, but the present invention is not limited to this. The image forming apparatus of the present invention may be applied to other types of image forming apparatuses such as electrophotographic type image forming apparatuses. [Explanation of symbols]

[0069] Reference Signs List 1: image forming apparatus, 2: image inspection apparatus, 10: control section, 20: control section, 21: image reading section, 22: image inspection section, 100: image forming section, 211: first reading section, 212: second reading section, 1000: image forming system

Claims

1. An image inspection device having an image inspection unit that inspects a first read image obtained by reading a recording member having an image formed on a first surface from the first surface side, and a control unit, When the control unit determines that the recording member is a transparent base material and that an image and a background are formed on the uppermost surface above the image on the first surface, the image inspection unit inspects a second read image read from a second surface side opposite to the first surface. Image inspection equipment.

2. The background is white.

2. The image inspection device according to claim 1.

3. The image inspection unit inspects the first read image when a coverage rate of the image covered by the white background is smaller than a predetermined threshold value.

3. The image inspection device according to claim 2.

4. The image inspection unit inspects the first scanned image when an attribute of the white background is text.

3. The image inspection device according to claim 2.

5. The image inspection unit inspects the first read image when the background has an irregular shape.

3. The image inspection device according to claim 2.

6. The image inspection unit performs image inspection using a reference image.

3. The image inspection device according to claim 2.

7. When inspecting the second read image read from the second surface side through the recording member which is a transparent base material, the image inspection unit compares a mirror image of the reference image with the second read image.

7. An image inspection apparatus according to claim 6.

8. When inspecting the second read image read from the second surface side through the recording member which is a transparent base material, the image inspection unit compares the reference image with a mirror image of the second read image.

7. An image inspection apparatus according to claim 6.

9. a first reading unit configured to read the recording member from the first surface side to obtain the first read image; a second reading unit that reads the recording member from a second surface side opposite to the first surface side to obtain the second read image. The image inspection device according to any one of claims 1 to 8.

10. The first reading unit and the second reading unit are different reading units, and the first reading unit and the second reading unit are disposed on opposite sides of a transport path along which the recording medium is transported.

10. The image inspection apparatus according to claim 9.

11. An image inspection method using an image inspection device having an image inspection unit that inspects a first read image obtained by reading a recording member having an image formed on a first surface from the first surface side, and a control unit, When the control unit determines that the recording member is a transparent base material and that an image is formed on the first surface and a background is formed on the top surface above the image, the image inspection unit inspects a second read image read from a second surface side opposite to the first surface. Imaging methods.

12. A program executed in an image inspection device having an image inspection unit that inspects a first read image obtained by reading a recording member having an image formed on a first surface from the first surface side, and a control unit, When the control unit determines that the recording member is a transparent base material and that an image is formed on the first surface and a background is formed on the top surface above the image, the image inspection unit inspects a second read image read from a second surface side opposite to the first surface. program.

13. a conveying path along which the recording material is conveyed; an image forming section for forming an image on a first surface of the recording member being conveyed; a first reading unit disposed downstream of the image forming unit in a recording material conveying direction, the first reading unit reading the recording material from the first surface side to obtain a first read image; a second reading unit disposed downstream in the transport direction from the image forming unit and configured to read the recording member from a second surface side opposite to the first surface side to obtain a second read image; An image forming system including an image inspection unit that inspects a first read image obtained by reading a recording material having an image formed on the first surface from the first surface side, and a control unit, When the control unit determines that the recording member is a transparent base material and that an image is formed on the first surface and a background is formed on the uppermost surface above the image, the image inspection unit inspects the second read image. Image forming system.

Images