JP6457854B2 - X-ray inspection equipment - Google Patents

Description

  The present invention relates to an X-ray inspection apparatus that inspects an inspection object using X-rays, and more particularly to an X-ray inspection apparatus that performs X-ray irradiation while conveying the inspection object.

  In general, an X-ray inspection apparatus irradiates X-rays from an X-ray generator to each type of inspection object (for example, meat, fish, processed food, pharmaceuticals, etc.) that are sequentially transported on a transport path at predetermined intervals. By detecting the amount of X-ray transmitted through the inspection object with an X-ray line sensor, it is possible to determine the presence or absence of foreign matter (metal, glass, stone, bone, etc.) or defects in the inspection object. A pass / fail judgment is made.

  In this type of X-ray inspection apparatus, one that selects any one of a plurality of different display forms (display modes) by a setting operation by an operator and displays an inspection image and an inspection result in the display form is known ( Patent Document 1).

  The apparatus described in Patent Document 1 calculates the mass of an inspection object based on the amount of X-rays that pass through the inspection object W, and measures the mass of the inspection object using a predetermined inspection algorithm. And a display form for simultaneously displaying the inspection value such as the waveform of the measured value, the pass / fail judgment reference value, and the margin of the measured value with respect to the pass / fail judgment reference value.

  The X-ray inspection apparatus described in Patent Document 1 is configured so that the inspection algorithm can be switched, and the user compares the inspection state after switching the inspection algorithm with the inspection state stored by the user before switching the inspection algorithm. By doing so, it is possible to grasp the characteristics of each inspection algorithm. For this reason, if the number of inspection algorithms is small, the user can grasp the characteristics of each inspection algorithm by setting the inspection algorithm a plurality of times and set an inspection algorithm suitable for the inspection.

JP 2007-286014 A

  However, in the conventional X-ray inspection apparatus, when there are a large number of selectable inspection algorithms, it is difficult for the user to grasp all the characteristics of each inspection algorithm. In particular, in the field of X-ray inspection equipment that inspects the quality of products that are incorporated into food and pharmaceutical production lines, inspection items and inspection details are improved by improving image processing technology and advanced inspection algorithms. It is diversifying. For this reason, the user spends a lot of time until the characteristics of each inspection algorithm are grasped, and the inspection algorithm suitable for the inspection cannot be easily determined.

  Therefore, the present invention has been made to solve the conventional problems as described above, and even when there are many selectable inspection algorithms, the user can easily grasp the characteristics of each inspection algorithm and is suitable for inspection. An object of the present invention is to provide an X-ray inspection apparatus capable of easily determining an inspection algorithm.

  The X-ray inspection apparatus according to the present invention displays an inspection image (Wk) based on a transmission image obtained by irradiating X-rays and detecting X-rays transmitted through an object (W) to be displayed (41). In the X-ray inspection apparatus that inspects the inspection object by applying a plurality of inspection algorithms including a combination of a plurality of image filters to the transmission image, and the density of the result of applying the plurality of inspection algorithms An image processing unit (43) that generates a projected image (Ws), which is a two-dimensional cross-sectional waveform image in which each peak value of the gray level in a direction orthogonal to the conveyance direction of the gray image is drawn along the conveyance direction. ) And a plurality of the projected images respectively corresponding to the plurality of inspection algorithms are displayed on the display at the same time so that they can be distinguished from each other and coincide with the positions in the transport direction. Parts and (47), characterized by comprising a.

  With this configuration, the display control unit simultaneously displays a plurality of projection images corresponding to a plurality of inspection algorithms on the display unit so that they can be distinguished from each other and coincide with the position in the transport direction. The characteristics of each inspection algorithm can be easily grasped by comparing each projected image at the same time. Therefore, even when there are a large number of selectable inspection algorithms, the user can easily grasp the characteristics of each inspection algorithm and can easily determine an inspection algorithm suitable for the inspection.

In the X-ray inspection apparatus according to the present invention, the display unit includes an inspection image display unit (41h) for displaying the inspection image, and a projection image display unit (41q) for displaying the projection image. Are arranged one above the other so as to coincide with the position in the transport direction, and the display control unit selects the plurality of inspection algorithms in accordance with an operation of selecting any of the plurality of inspection algorithms. The projection image obtained by the plurality of inspection algorithms may be displayed on the projection image display unit.

  With this configuration, when a foreign object is included in the inspection object, the position of the foreign object on the plane of the inspection object and the position of the foreign object in the width direction of the inspection object are referred to by simultaneously referring to the inspection image and the projection image. Can be easily grasped, and the detection state of the foreign matter can be grasped from the projected image.

  In the X-ray inspection apparatus according to the present invention, the display control unit may be configured to display the plurality of projected images on the display unit in a superimposed manner.

  With this configuration, the user can directly compare and view a plurality of projection images, and thus can easily grasp the algorithm characteristics of each projection image.

  Further, in the X-ray inspection apparatus according to the present invention, the display control unit is a threshold value for determining pass / fail of the inspection object, and the threshold level set in advance in each of the plurality of inspection algorithms May be configured to be displayed on the display together with the projected image.

  With this configuration, since the threshold level is displayed together with the projected image, the user can grasp the margin that is the interval between the threshold level and the projected image by comparing the threshold level with the projected image. .

  Further, in the X-ray inspection apparatus according to the present invention, the display control unit has, for at least one of the plurality of projection images, a plurality of threshold levels corresponding to the plurality of projection images, respectively. The scale of the light and shade level may be changed so that the display positions match, and the plurality of projected images may be superimposed and displayed on the display.

  With this configuration, since the display positions of a plurality of threshold levels match, the user can easily compare the margins of the projection images when grasping the margin, which is the interval between the threshold level and the projection image. be able to. Further, since only one threshold level display is required, the projected image is easy to see.

  In the X-ray inspection apparatus according to the present invention, the display control unit is configured to match the display positions of the plurality of threshold levels by enlarging or reducing the shade level scale of the projection image. May be.

  With this configuration, the display positions of a plurality of threshold levels can be matched.

  Further, in the X-ray inspection apparatus according to the present invention, the display control unit is configured to match the display positions of the plurality of threshold levels by shifting the position of the shade level scale of the projection image. Also good.

  With this configuration, the display positions of a plurality of threshold levels can be matched.

  The present invention provides an X-ray inspection apparatus that allows the user to easily grasp the characteristics of each inspection algorithm even when there are a large number of selectable inspection algorithms and to easily determine an inspection algorithm suitable for the inspection. it can.

1 is a perspective view showing a schematic configuration of an X-ray inspection apparatus according to an embodiment of the present invention. It is a figure which shows the side surface and internal structure of the X-ray inspection apparatus which concern on one Embodiment of this invention. It is a figure which shows the internal structure of the image process part of the X-ray inspection apparatus which concerns on one Embodiment of this invention. It is an example of a display of the initial screen during the inspection stop of the inspection object of the X-ray inspection apparatus which concerns on one Embodiment of this invention. It is an example of a display of the inspection screen during the test | inspection of the to-be-inspected object of the X-ray inspection apparatus which concerns on one Embodiment of this invention. It is another example of a display of the inspection screen during the test | inspection of the to-be-inspected object of the X-ray inspection apparatus which concerns on one Embodiment of this invention. It is another example of a display of the inspection screen during the test | inspection of the to-be-inspected object of the X-ray inspection apparatus which concerns on one Embodiment of this invention. It is a figure which shows the aspect of a change of a projection image. It is a figure which shows the aspect of another change of a projection image.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the configuration will be described.

  In FIG. 1, the X-ray inspection apparatus 1 includes a transport unit 2 and an inspection unit 3 inside a housing 4, and a display 41 is provided at the upper front of the housing 4.

  The transport unit 2 sequentially transports the inspected object W that constitutes the inspected object of the present invention at a predetermined interval, and the transport unit 2 is disposed horizontally, for example, inside the housing 4. It is constituted by a belt conveyor.

  The conveyance unit 2 directs the inspection object W carried in from the carry-in port 7 at a preset conveyance speed by driving the drive motor 6 shown in FIG. 1 toward the carry-out port 8 side (X direction in FIG. 1). The belt surface 2a as a conveyance surface is conveyed. Inside the housing 4, a space that penetrates the belt surface 2 a from the carry-in entrance 7 to the carry-out exit 8 forms a transport path 21.

  The inspection unit 3 irradiates X-rays in the inspection space 22 in the middle of the conveyance path 21 with respect to the inspected objects W that are sequentially conveyed, and detects X-rays that pass through the inspection object W. An X-ray generator 9 disposed at a predetermined height above the examination space 22 in the middle of 21, and an X-ray detector 10 disposed in the transport unit 2 so as to face the X-ray generator 9. It has.

  The X-ray generator 9 has a configuration in which a cylindrical X-ray tube 12 provided inside a metal box 11 is immersed in insulating oil (not shown), and electrons from the cathode of the X-ray tube 12 X-rays are generated by irradiating the target on the anode with the beam.

  The X-ray tube 12 is arranged such that its longitudinal direction is the conveyance direction (X direction) of the inspection object W. X-rays generated by the X-ray tube 12 are irradiated toward the lower X-ray detector 10 in a substantially triangular screen shape by a slit (not shown) so as to cross the transport direction (X direction).

  As shown in FIG. 2, X-rays emitted from the X-ray generator 9 reach the lower X-ray detector 10, and the X-ray detector 10 detects X-rays. An X-ray line sensor 51 is provided. The X-ray line sensor 51 includes a scintillator and a photodiode array (not shown). The X-ray is converted into light by the scintillator, and the light is converted into an electric signal by the photodiode array to output X-ray transmission data.

  On the ceiling portion 21a in the conveyance path 21, X-ray shielding shielding curtains 16 are suspended and arranged at a plurality of locations along the conveyance direction (X direction). The shielding curtain 16 is composed of a rubber sheet mixed with lead powder that shields X-rays and processed into a good shape (a state in which the upper part is connected and the lower part is divided into strips). X-rays are prevented from leaking from the inspection space 22 to the outside of the housing 4 via the conveyance path 21. In addition, you may comprise the shielding curtain 16 with metal plates, such as stainless steel.

  In this embodiment, two shielding curtains 16 are provided between the carry-in entrance 7 and the inspection space 22 and between the examination space 22 and the carry-out exit 8, and one shielding curtain 16 is inspected. Even when a gap is generated due to elastic deformation in contact with the object W, the other shielding curtain 16 shields X-rays, so that leakage of X-rays can be prevented without exceeding the leakage reference amount. In the X-ray inspection apparatus 1 according to the present embodiment, an inner space surrounded by the shielding curtain 16 in the transport path 21 forms an inspection space 22.

  The X-ray inspection apparatus 1 includes a control circuit 40 and a display 41. The control circuit 40 receives a transmission image obtained by imaging the X-ray transmission data from the X-ray detector 10 and inspects the presence or absence of foreign matters or defects in the inspection object W.

  The display device 41 is configured as a touch panel, and is integrally provided with a display unit that displays and outputs inspection results and the like by the control circuit 40 and an operation unit that inputs and inputs various parameters to the control circuit 40. Yes.

  In FIG. 4, the display device 41 includes an image display area 41A. The image display area 41A includes a product number display section 41a, an inspection result display section 41b, an inspection content display section 41c, and a detection limit value display section. 41d, start button 41e, stop button 41f, display mode switching button 41g, inspection image display unit 41h, irradiation state display unit 41i, conveyor operation state display unit 41j, setting adjustment button 41k, and production management A button 41m, an operation confirmation button 41n, and an inspection algorithm selection button display unit 41r are provided.

  The type number display unit 41a sets a number according to the type (for example, meat, fish, processed food, medicine) of the inspection object W, and displays a number according to the set type. The inspection result display unit 41b displays the pass / fail determination result of the inspection object W with characters or symbols such as “OK” and “NG”.

  The inspection content display unit 41c displays the total number of inspections of the inspection object W, the total number of non-defective products and the total number of defective products with respect to the total number of inspections. In the detection limit value display unit 41d, a plurality of different values (threshold values) can be set according to the type of the inspection object W, the type of foreign matter to be detected, and the like. Thus, the detection limit value is appropriately set, and the set detection limit value is displayed on the detection limit value display unit 41d. The detection limit value is set for the inspection algorithm selected by the inspection algorithm selection button display unit 41r. When a plurality of inspection algorithms are selected, a plurality of detection limit value display sections 41d corresponding to the respective inspection algorithms may be displayed so that the detection limit values can be set individually.

  The start button 41e is operated when instructing the start of the operation of the X-ray inspection apparatus 1, and the stop button 41f is operated when instructing the stop of the operation of the X-ray inspection apparatus 1. The display mode switching button 41g is operated when selecting a display form (display mode) displayed on the inspection image display unit 41h.

  The inspection image display unit 41h displays information on the inspection image of the inspection object W (inspection image Wk shown in FIG. 5). The irradiation state display unit 41i displays whether X-ray irradiation is being performed, and the conveyor operation state display unit 41j displays whether the transport unit 2 is operating.

  The setting adjustment button 41k calls a setting adjustment screen for setting and adjusting parameters such as switching of the type of the inspection object W, detection limit, and inspection algorithm used in the image processing unit 43. The production management button 41m calls a production management screen that displays statistical data for production management. The operation confirmation button 41n calls an operation confirmation screen for confirming the detection sensitivity and the like of the X-ray inspection apparatus 1. The inspection algorithm selection button display unit 41r includes a selection button B for selecting a desired inspection algorithm. The selection button B corresponds to each inspection algorithm indicated by CT0, CT1,..., And one or a plurality of inspection algorithms can be selected.

  In the image display area 41A, the product number display unit 41a, the inspection result display unit 41b, the inspection content display unit 41c, the detection limit value display unit 41d, the start button 41e, the stop button 41f, and the inspection algorithm selection button display unit 41r It is provided in the right region in FIG. 4 with respect to the display unit 41h.

  In the image display area 41A, the irradiation state display unit 41i and the conveyor operation state display unit 41j are provided above the inspection image display unit 41h, and include a display mode switching button 41g, a setting adjustment button 41k, a production management button 41m, and an operation. The confirmation button 41n is provided below the inspection image display unit 41h.

  In FIG. 2, the control circuit 40 includes an X-ray image storage unit 42, an image processing unit 43, a determination unit 44, a control unit 46, and a display control unit 47.

  The X-ray image storage unit 42 temporarily stores the transmission image received from the X-ray detector 10. The image processing unit 43 performs image processing such as feature extraction and filter processing for enhancing foreign matter on the transmission image read from the X-ray image storage unit 42.

  As illustrated in FIG. 3, the image processing unit 43 includes a plurality of image processing blocks 31 in parallel with the input transparent image. Each image processing block includes a filter processing unit 32, a processed image generation unit 33, and a projected image generation unit 34. The image processing unit 43 stores a plurality of different inspection algorithms, and includes as many image processing blocks 31 as the number of inspection algorithms. In FIG. 3, three image processing blocks 31 are shown for ease of explanation.

  In each image processing block 31, the filter processing unit 32 performs image processing that combines feature extraction, filter processing for foreign matter enhancement, and the like on any of the plurality of inspection algorithms on the transmission image. The processed image generation unit 33 generates a processed image that is a two-dimensional image corresponding to the planar view of the inspection object W from the grayscale image that has been subjected to the image processing. The projected image generation unit 34 is a projected image (FIG. 5) that is a two-dimensional cross-sectional waveform image in which each peak value of the gray level in the direction orthogonal to the conveyance direction of the processed image is drawn along the conveyance direction from the gray image after image processing. (See the projected image Ws [Ws1, Ws2]).

  The image processing unit 43 outputs all processed images corresponding to each inspection algorithm to the determination unit 44. Further, the image processing unit 43 includes a projection image selector 35. The projection image selector 35 receives as many projection images as the number of inspection algorithms generated by the projection image generation unit 34 of each image processing block 31. Of the input projected images, one or more selected projected images are output to the display control unit 47. Further, the image processing unit 43 outputs the transmission image read from the X-ray image storage unit 42 to the display control unit 47.

  The determination unit 44 compares the processed image processed by the image processing unit 43 with the detection limit value preset for each inspection algorithm by the detection limit value display unit 41d, and based on the comparison result, the inspection object The presence / absence of foreign matter in W and the presence / absence of a defect are determined. Then, the determination unit 44 determines that the inspection object W is a defective product when the processed image that has undergone image processing exceeds the detection limit value in each inspection algorithm used for the inspection.

  The display control unit 47 displays the inspection result of the inspection object W on the display 41 based on the transmission image of each inspection object W, the projection image output from the image processing unit 43, and the pass / fail determination result of the determination unit 44. Display.

  While the inspection of the inspection object W is stopped, as shown in FIG. 4, the display control unit 47 displays the initial screen 61 in the image display area 41A. In the initial screen 61, the inspection image display unit 41h, the inspection result display unit 41b, and the inspection content display unit 41c are blank. When the start button 41e is operated from this state, the inspection of the inspection object W is started. During the inspection of the inspection object W, as shown in FIG. 5, an inspection screen 62 under inspection is displayed in the image display area 41A.

  During the inspection of the inspection object W, as shown in FIG. 5, the display control unit 47 displays the inspection image Wk of the inspection object W on the inspection image display unit 41h of the image display area 41A. Here, an example in which four contents N1 to N4 are accommodated in a package as the inspection object W is taken as an example. In the inspection image Wk of FIG. 5, a state in which the foreign matter 71 is mixed in the contents N2 and N3 and a foreign matter 72 of a type different from the foreign matter 71 is mixed in the content N4 is displayed.

  The display control unit 47 displays the transmission image as the inspection image Wk. Alternatively, the display control unit 47 may superimpose an image in which the foreign matter 71 and the foreign matter 72 are emphasized on the basis of the quality determination result of the determination unit 44 and display the image as the inspection image Wk. Alternatively, the image processing unit 43 may be configured to output each processed image to the display control unit 47, and the display control unit 47 may select all images or any plurality of images among the transmission image and each processed image. May be displayed as the inspection image Wk.

  Further, the display control unit 47 updates the inspection results such as the total number of inspections, the number of non-defective products, and the total number of NG for each inspection of the inspection target W, and the updated total number of inspections, the number of good products, NG The display 41 is controlled so that the inspection results such as the total number are displayed on the inspection content display unit 41c.

  The image display area 41A of the display device 41 further includes a projection image display unit 41q that displays the projection image Ws, and the projection image display unit 41q is disposed below the inspection image display unit 41h. The projected image display unit 41q may be arranged above the inspection image display unit 41h.

  On the display device 41, an inspection image display unit 41h for displaying the inspection image Wk and a projection image display unit 41q for displaying the projection image Ws so as to coincide with the position of the inspection object W in the transport direction. Are arranged one above the other. Here, the inspection image Wk and the projection image Ws are displayed on the inspection image display unit 41h in the same direction as the movement direction of the inspection object W in accordance with the movement of the inspection object W by the transport unit 2. It may be displayed on the part 41h, or may be displayed so as to be stationary at the center in the left-right direction of the inspection image display part 41h.

  When the inspection image Wk and the projection image Ws are stopped at the center in the left-right direction of the inspection image display unit 41h, the next inspection object W after the inspection object W being inspected is conveyed to the inspection space 22 at the next time. The display is updated to the inspection image Wk and the projection image Ws of the inspection object W.

  FIG. 5 is a display example when two inspection algorithms are selected. The display control unit 47 arranges two projected image display units 41q, and each of the two inspection algorithms corresponding to the selected two inspection algorithms. The projected images Ws1 and Ws2 are arranged and simultaneously displayed on the display 41. In FIG. 5, two projected images Ws, that is, a projected image Ws 1 having a peak corresponding to the foreign object 71 and a projected image Ws 2 having a peak corresponding to the foreign object 72 are displayed on the display device 41.

  Here, the display control unit 47 displays the projected images Ws1 and Ws2 on the display device 41 so that they can be distinguished from each other. For example, the display control unit 47 displays the projected images Ws1 and Ws2 such that any of the types of lines to be displayed, shades, and colors is different. Or the display control part 47 displays the character and symbol for identifying each projection image Ws1, Ws2 in the vicinity of each projection image Ws1, Ws2. In FIG. 5, each of the projected images Ws1 and Ws2 can be identified by changing the type of line to be displayed to a solid line and a dotted line.

  In each of the projected images Ws1, Ws2, detection limit values L1, L2, which are threshold levels for determining pass / fail, are displayed. By displaying the detection limit values L1 and L2, the user compares the detection limit value L1 and the projection image Ws1, the detection limit value L2 and the projection image Ws2, and compares the detection limit value L and the projection image Ws. The margin that is the interval can be grasped.

  Note that only one of the inspection image Wk and each of the projected images Ws1 and Ws2 may be displayed by a user operation.

  Further, the display control unit 47 may be configured to simultaneously display a plurality of projection images Ws in a single projection image display unit 41q. FIG. 6 shows an example in which the projected images Ws1 and Ws2 are superimposed and displayed simultaneously. In addition, although description is abbreviate | omitted in FIG. 6, each detection limit value L1, L2 may also be displayed simultaneously.

  Further, the display control unit 47 overlaps the plurality of projection images Ws and the detection limit value L, and simultaneously displays the plurality of projection images so that the display positions of the detection limit values L of the projection images Ws coincide with each other. Of Ws, the shade level scale of at least one projected image Ws may be changed. In other words, the display control unit 47 changes the shade level scale of the projected image Ws so that the detection limit value L is displayed as a single line that can be shared by each projected image Ws. FIG. 7 is an example in the case of displaying in such a manner, and the detection limit value Lx sharing the detection limit values L1 and L2 is displayed, and the projected image Ws2 in which the scale of the gray level is reduced according to this, The projected image Ws1 is superimposed and displayed simultaneously.

  An example of changing the projected image Ws described above will be described with reference to the drawings. FIG. 8 shows the display position of the detection limit value L of each projection image Ws by enlarging or reducing the scale of the shade level of the projection image when three projection images Ws1, Ws2, and Ws3 are simultaneously displayed. It is shown schematically that they match.

  In FIG. 8, the display control unit 47 reduces the shade level scale of the projection image Ws2 so that the display positions of the detection limit values L2 and L3 coincide with the display position of the detection limit value L1 of the projection image Ws1. The shade level scale of the projected image Ws3 is expanded. Then, the display control unit 47 displays the three projected images Ws1, Ws2, and Ws3 simultaneously and displays the common detection limit value Lx.

  FIG. 9 shows the detection limit value of each projection image Ws by shifting (sliding) the scale level of the projection image when the three projection images Ws1, Ws2, and Ws3 are displayed simultaneously. FIG. 6 schematically shows that the display positions of L are matched.

  In FIG. 9, the display control unit 47 slides the grayscale level scale of the projection image Ws2 downward so that the display positions of the detection limit values L2 and L3 coincide with the display position of the detection limit value L1 of the projection image Ws1. At the same time, the shade level scale of the projected image Ws3 is slid upward. Then, the display control unit 47 displays the three projected images Ws1, Ws2, and Ws3 simultaneously and displays the common detection limit value Lx.

  8 and 9 change the other projected images Ws2 and Ws3 based on the display position of the detection limit value L1 of the projected image Ws1, but the present invention is not limited to this. For example, the predetermined display position may be set as the display position of the common detection limit value Lx, and all the projected images Ws may be changed according to the display position.

  Further, the display device 41 has been described as being configured as a touch panel in which the display unit and the operation unit are integrally provided. However, the operation unit is separated and other devices such as a mouse and a keyboard are provided. You may comprise by an input means.

  The X-ray inspection apparatus according to the present invention is useful as an X-ray inspection apparatus that performs X-ray irradiation while conveying an inspection object.

DESCRIPTION OF SYMBOLS 1 X-ray inspection apparatus 2 Conveyance part 9 X-ray generator 10 X-ray detector 41 Display 41h Inspection image display part 41q Projection image display part 43 Image processing part 44 Determination part 47 Display control part W Inspected object Wk Inspection image Ws , Ws1, Ws2, Ws3 Projection image L, L1, L2, L3, Lx Detection limit value (threshold level)

Claims (7)

The inspection image (Wk) based on the transmission image obtained by irradiating the X-ray and detecting the X-ray transmitted through the inspection object (W) is displayed on the display (41). In an X-ray inspection apparatus that performs a plurality of inspection algorithms that combine a plurality of image filters and inspects the inspection object,
A projected image, which is a two-dimensional cross-sectional waveform image in which the peak values of the gray level in the direction orthogonal to the conveyance direction of the gray image are drawn along the conveyance direction with respect to the gray image as a result of performing the plurality of inspection algorithms An image processing unit (43) for generating (Ws);
A display control unit (47) for simultaneously displaying the plurality of projected images respectively corresponding to the plurality of inspection algorithms on the display so as to be distinguishable from each other and coincide with the position in the transport direction;
An X-ray inspection apparatus comprising: On the display, an inspection image display unit (41h) for displaying the inspection image and a projection image display unit (41q) for displaying the projection image coincide with the positions in the transport direction. Placed one above the other,
The display control unit displays, on the projection image display unit, the projection image of the selected plurality of inspection algorithms in response to an operation of selecting an arbitrary plurality of the inspection algorithms among the plurality of inspection algorithms. The X-ray inspection apparatus according to claim 1, wherein:   The X-ray inspection apparatus according to claim 1, wherein the display control unit displays the plurality of projection images on the display unit in an overlapping manner.   The display control unit is a threshold value for determining pass / fail of the inspection object, and displays the threshold level preset in each of the plurality of inspection algorithms on the display unit together with the projection image. The X-ray inspection apparatus according to any one of claims 1 to 3, wherein   The display control unit scales the gray level so that display positions of a plurality of the threshold levels respectively corresponding to the plurality of projection images coincide with each other with respect to at least one of the plurality of projection images. The X-ray inspection apparatus according to claim 4, wherein the plurality of projection images are superimposed and displayed on the display unit by changing the projection image.   6. The X-ray inspection apparatus according to claim 5, wherein the display control unit matches the display positions of the plurality of threshold levels by enlarging or reducing the shade level scale of the projected image. . The X-ray inspection apparatus according to claim 5, wherein the display control unit matches the display positions of the plurality of threshold levels by shifting a position of the gray level scale of the projection image.