JP6796050B2 - X-ray inspection equipment and X-ray inspection method - Google Patents

Description

The present invention is an X-ray inspection apparatus and an X-ray inspection apparatus for irradiating a transported object to be inspected with X-rays and inspecting a defective seal of the inspected object by using a transmitted image of the X-rays when the X-rays are irradiated. Regarding the inspection method.

The X-ray inspection device is a device that inspects an inspected object by using, for example, raw meat, fish, processed food, medicine, etc. as the inspected object, and using an X-ray transmission image when the inspected object is irradiated with X-rays. Traditionally known as.

For example, in the X-ray inspection apparatus of Patent Document 1 below, an outer shape is extracted from a transmitted image when X-rays are exposed to an object to be inspected, and the outer shape is used as a reference based on preset seal information. The seal area of the object to be inspected is calculated, and the seal defect is inspected using the density level of the image of the calculated seal area.

Further, in the X-ray inspection apparatus of Patent Document 2 below, an external image of the inspected object to which an identifier for specifying the product size of the inspected object and the position and length of the seal width of the seal portion is given, and the product size and the seal width are given. The setting items to be set are associated with the identifier and displayed as the setting input screen on one screen.

JP-A-2005-024549 Japanese Unexamined Patent Publication No. 2005-091015

However, in the X-ray inspection apparatus of Patent Document 1 and Patent Document 2 described above, when the seal portion region is specified based on the outer shape or the product size or the seal width is set, if the packaging material is bent and the outer shape is deformed, There is a possibility that a region other than the seal region is calculated as the seal region, and there is a problem that the seal region cannot be correctly specified. Further, if the seal portion area is specified based on the contents, there arises a problem that the seal portion area cannot be correctly specified unless the shape of the contents contained in the packaging material is stable. .. As a result, what was caught inside the seal portion region was sometimes overlooked.

Therefore, the present invention has been made in view of the above problems, and is an X-ray inspection apparatus capable of determining the presence or absence of unnecessary substances in the seal portion region with higher accuracy than before and inspecting for seal defects. And an X-ray inspection method is intended to be provided.

In order to achieve the above object, in the X-ray inspection apparatus according to claim 1 of the present invention, the contents are wrapped in a packaging material and the outside of the contents accommodating area S4 for accommodating the contents is sealed. An X-ray inspection apparatus 1 for inspecting an inspected object by irradiating X-rays while transporting the inspected object W at predetermined intervals and using a transmitted image of the X-ray transmitted through the inspected object.
The outer shape region region extracting means 12 for extracting the outer shape region S1 of the object W to be inspected from the transparent image, and
The content region extraction means 13 for extracting the content region S2 of the object to be inspected from the transparent image, and
A reference line L1 corresponding to a part of one side where the contents of the contents accommodating area are offset is calculated from the contour of the contents in the contents region, and the contents accommodating obtained based on the reference line. The content accommodating area extraction means 14 for extracting the area S4 and
Seal area calculation for calculating the seal area S3 by excluding the content storage area extracted by the content storage area extraction means from the external area of the object to be inspected extracted by the external area extraction means. Means 15 and
It is characterized by including a signal processing unit 6 including a seal defect determining means 16 for determining the presence or absence of a seal defect depending on whether or not there is an unnecessary substance in the seal unit region .

The X-ray inspection apparatus according to claim 2 is the X-ray inspection apparatus according to claim 1 .
The content accommodating area extraction means 14 includes a reference line calculating means 14a that linearly approximates the contour of the content in the content area to calculate the reference line L1.
The neighborhood line L3, which is a part of the adjacent side adjacent to the reference side of the content accommodating area S4 formed by extending the reference line, is calculated by linearly approximating the contour of the content in the content area. It is characterized in that it is provided with the neighborhood line calculation means 14b.

X-ray examination apparatus as claimed in claim 3 is the X-ray inspection apparatus according to claim 2,
The reference line calculating means 14a sets the reference line L1 with reference to the midpoint of an approximate straight line that linearly approximates the contour of the contents in the contents area corresponding to the position of the reference side of the contents accommodating area S4. It is characterized by calculating.

In the X-ray inspection method according to claim 4 , the inspected object W whose contents are wrapped in a packaging material and whose outside of the contents accommodating area S4 for accommodating the contents is sealed is conveyed at predetermined intervals. This is an X-ray inspection method in which an X-ray is irradiated while the object is inspected by using a transmitted image of the X-ray transmitted through the object to be inspected.
A step of extracting the outer shape region S1 of the object to be inspected from the transparent image, and
A step of extracting the content region S2 of the object to be inspected from the transparent image, and
A reference line L1 corresponding to a part of one side where the contents of the contents accommodating area are offset is calculated from the contour of the contents in the contents region, and the contents accommodating obtained based on the reference line. Steps to extract the area and
A step of calculating the seal portion region S3 by excluding the content accommodating region from the outer shape portion region of the object to be inspected, and
It is characterized by including a step of determining the presence or absence of a seal defect depending on whether or not there is an unnecessary substance in the seal portion region.

According to the present invention, the presence or absence of unnecessary substances in the seal portion region can be determined with higher accuracy and the seal defect inspection can be performed as compared with the conventional case, and the quality of the seal defect inspection can be improved. it can.

It is a block diagram which shows the schematic structure of the X-ray inspection apparatus which concerns on this invention. It is a figure which shows an example of the transmission image of the object to be inspected. It is a flowchart which shows the schematic procedure of the X-ray inspection method using the X-ray inspection apparatus which concerns on this invention. It is a flowchart which shows the calculation procedure of the content accommodating area of FIG. It is explanatory drawing which shows an example of the calculation procedure of the contents accommodation area (a)-(f). It is explanatory drawing which shows an example of the other calculation procedure of (a), (b) content accommodation area.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the attached drawings.

[Outline of the present invention]
The X-ray inspection apparatus according to the present invention is incorporated into, for example, a part of a transport line, and for an object (article) to be inspected that is sequentially transported at regular intervals, to a seal portion of the contents packaged in a packaging material. This is to inspect for defective seals by determining the presence or absence of unnecessary substances due to biting or the like.

The objects to be inspected include, for example, a package containing a folded sheet containing a liquid (toner, beauty essence) such as a face mask in a packaging material, and a retort food. There are packaging products in which liquid or gel-like contents are filled in packaging materials, and packaging products in which powder-like contents are filled in packaging materials.

For example, in the case of a face mask, due to the difference in the packaging process, a sheet and a liquid are filled from the upper opening that forms one side of the bag-shaped packaging material that is sealed on three sides, and then sealed to cover the four sides, and a band shape. The packaging material is sealed at predetermined intervals, and there is a packaging product in which four sides are covered by sealing after filling a sheet and a liquid from two side surface openings opened between the sealed portions.

Finally, the rectangular (rectangular or square) package covered with four sides has a content storage area in which the contents are stored is almost constant, but the contents are particularly viscous liquid-like contents. Objects tend to be transported in a biased manner on one side of the contents storage area (particularly in the center of one side).

Therefore, the present invention utilizes the above tendency to start from a straight line (reference line) corresponding to a part of one side (the side where the contents are accommodated in a biased manner) in the transmission image of the object to be inspected. A function to specify the storage area, mask the content storage area from the outer shape area of the object to be inspected, and specify the seal area to inspect the seal defect depending on whether or not there is an unnecessary object in the seal area. Has.

[Configuration of X-ray inspection equipment]
As shown in FIG. 1, the X-ray inspection device 1 of the present embodiment has a transport device 2, an X-ray generator 3, an X-ray detector 4, a setting input unit 5, and a signal processing unit in order to realize the above functions. 6. The display unit 7 is included in the outline.

The transport device 2 sequentially transports the object W to be inspected on the transport path at predetermined intervals, and is composed of, for example, a belt conveyor arranged horizontally with respect to the device main body.

The belt conveyor 2 as a transfer device includes a transfer belt 2a made of a material (element other than an element having a large atomic weight) that easily transmits X-rays, and is a transfer control means (not shown) when inspecting the object W to be inspected. The conveyor belt 2a is driven at a transfer speed set in advance by the setting input unit 5 by the rotation of the drive motor M based on the control of. As a result, the object W to be inspected carried in from the carry-in port is conveyed toward the carry-out port side in the transport direction X in FIG.

The X-ray generator 3 irradiates an inspected object W transported on a transport path in a transport direction X from a carry-in inlet to a carry-out outlet with X-rays, and targets electrons accelerated by applying a voltage. It has a cylindrical X-ray tube that is struck to generate X-rays, and an irradiation slit for irradiating the X-rays generated by the X-ray tube toward the X-ray detector 4.

The X-ray tube has, for example, a structure in which a cylindrical X-ray tube provided inside a metal box is immersed in insulating oil, and an electron beam from the cathode of the X-ray tube is applied to the anode target to emit X-rays. Generate. The X-ray tube is provided in a direction in which its longitudinal direction is orthogonal to the plane of the transport direction of the object W to be inspected (X direction in FIG. 1), and the generated X-rays are directed toward the lower X-ray detector 4. , A screen-like irradiation is performed by an irradiation slit along the longitudinal direction.

The X-ray detector 4 has a plurality of elements arranged in a straight line in a direction orthogonal to the transport direction X on a plane of the transport direction X of the object to be transported W to be transported. More specifically, the X-ray detector 4 is configured in an array with a plurality of photodiodes arranged in a line and a scintillator provided on the line photodiode.

The X-ray detector 4 detects X-rays transmitted through the object W to be inspected and the transport belt 2a by a plurality of elements (array of photodiode and scintillator), and uses the detected detection data for a plurality of elements for each element. It is sequentially output to the signal processing unit 6 as one line, and the output is sequentially repeated as the inspected object W is conveyed.

The setting input unit 5 is composed of, for example, a key, a push button, a switch, and a soft key on the display screen of the display unit 7 provided in the main body of the device.

The setting input unit 5 has a threshold value for extracting the outer shape region S1 of the inspected object W shown in FIG. 2 and a threshold value for extracting the content region S2 when inspecting the seal defect of the inspected object W. A storage means described later in the signal processing unit 6 is set by appropriately setting a detection limit value, which is a criterion for determining a seal defect based on the presence or absence of an unnecessary object in the seal area S3, according to the type of the object W to be inspected, the type of foreign matter, and the like. It is operated when storing in 11.

Further, the setting input unit 5 sets the transport speed of the transport belt 2a of the transport device 2, the position of the reference side of the content accommodating area S4 of the object W to be inspected shown in FIG. 2, the length of the reference line L1, and the adjacent line. It is operated when the length of L2 and the length of the neighborhood lines L3 (L3a, L3b) are set and stored in the storage means 11 of the signal processing unit 6.

Further explaining, the position of the reference side of the content accommodating area S4 changes according to the above-mentioned packaging process and the transport direction X, and is located at the position of one side of the content accommodating area S4 in which the contents are accommodated in a biased manner. Correspondingly, for example, of the four sides of the rectangular (square, rectangular) content storage area S4, any one of the upper side, the lower side, the right side, and the left side is set as the position of the reference side by the setting input unit 5. To. For example, FIG. 2 shows a state in which the left side of the content accommodating area S4 is set as the position of the reference side because the content is offset to the left side of the content accommodating area S4.

Further, the reference line L1 is a line for specifying the reference side of the content accommodating area S4, and its length (for example, in mm units) is set by the setting input unit 5. The adjacent line L2 is a line for specifying two adjacent sides adjacent to the reference side of the content accommodating area S4, and the length thereof is set by the setting input unit 5. The neighborhood line L3 (L3a, L3b) is a line for specifying the position of the adjacent line L2, and its length (for example, in mm units) is set by the setting input unit 5.

As shown in FIG. 1, the signal processing unit 6 includes a storage means 11, an outer shape area area extraction means 12, a content area extraction means 13, a content storage area calculation means 14, a seal part area calculation means 15, and a seal defect determination means. 16 is included.

The storage means 11 stores the X-ray transmission data for each inspected object W from the X-ray detector 4. The X-ray transmission data is obtained by A / D converting an electric signal from the X-ray detector 4 by an A / D converter (not shown). More specifically, each time the storage means 11 inspects one inspected object W, at least several hundreds of X-ray transmission data are conveyed per one line (Y direction) of the X-ray detector 4. Only a predetermined number of lines (for example, several hundred lines) corresponding to the length of the object W to be inspected W in the transport direction (corresponding to the detection period from the front end to the rear end) are stored.

The external region region extracting means 12 provides an entire transmitted image (inspected object W and a belt surface) having a density level corresponding to a shade value that is lighter as the amount of transmission increases from the X-ray transmission data stored in the storage means 11. An image including the image) is created, and a transparent image having a density level equal to or higher than the threshold set in the setting input unit 5 is displayed from the created transparent image in the outer shape region of the packaging material Wa (the outline of the object W to be inspected shown in FIG. 2). (Area showing the inner area from) S1 is extracted.

The external region region extraction means 12 obtains an overall density histogram of the entire transmitted image created from the X-ray transmission data stored in the storage means 11, and the data of the object W to be inspected and the inspected object W are obtained from the obtained density histogram. It is divided into data other than the object W (belt surface) and binarized. For example, in the overall density histogram, the data of the object to be inspected is 255, the data other than the object to be inspected is 0, and the data is binarized and binarized. The data of the object W to be inspected can be extracted as the outer shape region S1 of the packaging material Wa.

The content area extraction means 13 uses the threshold value set by the setting input unit 5, and the content Wb of the inspected object W exists as a transparent image having a density level exceeding the threshold value from the transparent image in the outer shape area S1. It is extracted as a content region (a portion showing the inner area from the outline of the content shown in FIG. 2) S2. Further, in the content region extraction means 13, in parallel with the extraction process of the outer shape region S1, the content Wb of the object W to be inspected has a transparent image having a density level exceeding the threshold value set by the setting input unit 5. It may be extracted as the content area S2 to be used.

Since the image of the content region S2 extracted by the content region extraction means 13 has fine recesses in its outer shape, the image of the content region S2 is expanded N times and then N times. It is preferable to perform an image process of filling the concave portion of the outer shape by a closing process of shrinking.

As shown in FIG. 2, the content accommodating area calculation means 14 calculates a rectangular (square, rectangular) content accommodating area S4 forming an area in which the content is accommodating, and the reference line calculation means 14a , The neighborhood line calculation means 14b is provided.

As shown in FIG. 2, the reference line calculating means 14a calculates the reference line L1 corresponding to a part of the reference side (one side) of the content accommodating area S4. Further explaining, the reference line calculating means 14a is a portion corresponding to the position of the reference side of the content accommodating area S4 set by the setting input unit 5 with respect to the outline of the content in the content area S2 of the object W to be inspected. Is linearly approximated, and the linearly approximated portion of the length set by the setting input unit 5 is calculated as the reference line L1. At that time, the reference line L1 is set with reference to the midpoint of the approximate straight line that linearly approximates the contour of the content in the content region S2 corresponding to the position of the reference side of the content accommodating region S4. Calculate so that it coincides with the midpoint of the reference line L1. The approximate straight line is calculated by using the least squares approximation for finding the straight line that minimizes the total distance from the straight line for the point cloud (a group of pixels) that constitutes the outline of the content.

As shown in FIG. 2, the neighborhood line calculating means 14b calculates the neighborhood lines L3 (L3a, L3b) corresponding to a part of the adjacent sides (two sides) adjacent to the reference side of the content accommodating area S4. Further, the neighborhood line calculation means 14b linearly approximates the contour of the content in the content region S2 of the object W to be inspected by linearly approximating the portion corresponding to the adjacent side adjacent to the reference side of the content storage region S4. The neighborhood lines L3 (L3a, L3b) of the book are calculated.

As shown in FIG. 2, the content accommodating area calculation means 14 extends the two neighborhood lines L3 (L3a, L3b) calculated by the neighborhood line calculation means 14b, and the reference calculated by the reference line calculation means 14a. Two adjacent lines L2 (L2a, L2b) starting from the intersection with the extension reference line L4 composed of approximate straight lines extending both ends of the line L1 are calculated with the length set by the setting input unit 5. Then, the area surrounded by the extension reference line L4, the two adjacent lines L2 (L2a, L2b), and the straight line L5 connecting the end points of the two adjacent lines L2 (L2a, L2b) is the content accommodating area S4. Calculate as.

As shown in FIG. 2, the seal portion area calculation means 15 extracts the contents storage area S4 calculated by the contents storage area calculation means 14 from the outer shape of the object W to be inspected by the outer shape area extraction means 12. The seal portion region S3 is calculated by excluding it from the portion region S1.

As shown in FIG. 2, the seal defect determining means 16 determines whether or not there is a seal defect based on whether or not there is an unnecessary object in the seal portion region S3 calculated by the seal portion region calculating means 15.

The display unit 7 is composed of a display device such as a liquid crystal display, and is used as an overall image of an object to be inspected W including an outer shape area S1, a content area S2, a seal area S3, and a content storage area S4, and a determination result. Based on the X-ray transmission image of the object W to be inspected in a plan view, the quality judgment result of "OK" or "NG", the total number of inspections, the number of non-defective products, the total number of NGs, etc. are displayed based on the operation of the setting input unit 5. Display on the screen.

[X-ray inspection method]
Then, an X-ray inspection method for determining the presence or absence of a seal defect of the object W to be inspected by using the X-ray inspection apparatus 1 configured as described above will be described with reference to the flowchart of FIG.

First, the outer shape region region S1 of the packaging material of the object to be inspected W is extracted by the outer shape region region extraction means 12 from the transmission image based on the X-ray transmission data stored in the storage means 11 (ST1). Further, the content area S2 is extracted by the content area extraction means 13 from the transmitted image based on the X-ray transmission data stored in the storage means 11 (ST2).

Subsequently, a reference line L1 which is a part of the reference side of the content storage area S4 is calculated from the outline of the content of the content area S2 extracted by the content area extraction means 13, and the reference line L1 is used as follows. The content storage area S4 is calculated by the calculation method described in (ST3).

[Calculation method of contents storage area]
Hereinafter, the method of calculating the content accommodating area S4 by the content accommodating area calculating means 14 will be described with reference to the flowchart of FIG. 4 and the explanatory diagram of FIG. Here, the position of the reference side of the content accommodating area S4 of the object W to be inspected is set to the left side, and the lengths of the reference line L1, the adjacent line L2, and the neighboring lines L3a and L3b are set by the setting input unit 5. It is assumed that

When calculating the content storage area S4, first, the reference line L1 is calculated by linearly approximating the contour of the content of the content area S2 extracted by the content area extraction means 13 (ST11). Specifically, as shown in FIG. 5A, the contour of the contents of the contents area S2 corresponding to the position of the reference side of the contents storage area S4 set by the setting input unit 5 is linearly approximated. , Draw a reference line L1 so that the midpoint of the left side of the contour of the content that is approximately linearly approximated and the midpoint of the reference line L1 coincide with each other.

Next, as shown in FIG. 5B, an extension reference line L4 composed of an approximate straight line extending both ends of the reference line L1 is drawn (ST12).

Next, two neighborhood lines L3a and L3b corresponding to a part of the adjacent sides (two sides) adjacent to the reference side of the content accommodating area S4 are calculated (ST13). Specifically, as shown in FIG. 5C, the contour of the content of the content area S2 extracted by the content area extraction means 13 is placed on an adjacent side adjacent to the reference side of the content storage area S4. Two neighboring lines L3a, with a length set by the setting input unit 5, starting from the intersection with the extension reference line L4, which is an approximate straight line extending both ends of the reference line L1 by linearly approximating the corresponding portion. Draw L3b.

Next, two adjacent lines L2 (L2a, L2b) corresponding to the adjacent sides (two sides) adjacent to the reference side of the content accommodating area S4 are calculated with reference to the two neighboring lines L3a and L3b ( ST14). Specifically, as shown in FIG. 5D, the length set in advance by the setting input unit 5 is set from the intersection P1 which passes through one of the neighboring lines L3a and intersects with the extension reference line L4. Draw the adjacent line L2a of. Similarly, the other adjacent line L2b is drawn with a length set in advance by the setting input unit 5 starting from the intersection P2 that passes through the other neighboring line L3b and intersects with the extension reference line L4. As a result, as shown in FIG. 5E, the extension reference line L4 located between the start point of the adjacent line L2a and the start point of the adjacent line L2b corresponds to the reference side of the content accommodating area S4.

Next, as shown in FIG. 5 (f), the end point of the adjacent line L2a and the end point of the adjacent line L2b are connected by a straight line L5 (ST15), and the extension reference line L4 and the two neighboring lines L3a and L3b are connected. The area surrounded by the straight line L5 is calculated as the content storage area S4 (ST3).

Next, the seal portion area calculation means 15 of the object W to be inspected, in which the content storage area S4 calculated by the content storage area calculation means 14 as described above is extracted by the outer shape area extraction means 12. The seal portion area S3 is calculated by excluding it from the outer shape portion region S1 (ST4).

Then, the seal defect determination means 16 determines the presence or absence of a seal defect based on whether or not there is an unnecessary substance in the seal portion region S3 calculated by the seal portion region calculation means 15 (ST5), and ends the determination process.

[Modification example]
By the way, in the above-described embodiment, when the external dimensions of the contents accommodating area S4 are known in advance, the external dimensions (vertical and horizontal sizes) of the contents accommodating area S4 are input from the setting input unit 5. Then, as shown in FIG. 6A, a U-shape obtained from an extension reference line L4 composed of an approximate straight line extending the reference line L1 by the above-mentioned calculation method and two neighboring lines L3 (L3a, L3b). The seal portion area S3 is specified by aligning the content accommodating area S4 with the external dimensions input from the setting input unit 5 with respect to the side (the side corresponding to the reference side and the adjacent side of the content accommodating area S4). May be good.

Then, the content storage area S4 obtained as described above is removed from the outer shape area S1 of the object W to be inspected extracted by the outer shape area extraction means 12, and the seal part area S3 is calculated to calculate the seal part. The seal defect determining means 16 determines whether or not there is a seal defect depending on whether or not there is an unnecessary object in the region S3. For example, in the example of FIG. 6B, since the unnecessary object Wa (the portion painted in black in the figure) exists in the seal portion region S3, the seal defect determining means 16 determines that there is a seal defect.

As described above, in the X-ray inspection apparatus and the X-ray inspection method of the present embodiment, the content accommodating area is specified from a part of a straight line on one side of the content accommodating area in which the content is accommodated, and the object to be inspected. The content accommodating area is masked from the outer shape area to specify the seal area. As a result, even if the outer shape of the packaging material of the object to be inspected is deformed or the shape of the contents contained in the packaging material varies, the reliability of the specified seal region becomes high, and compared with the conventional case, It is possible to determine the presence or absence of unnecessary substances in the seal portion region with higher accuracy and inspect the seal defect, and improve the quality of the seal defect inspection.

Although the best form of the X-ray inspection apparatus and the X-ray inspection method according to the present invention has been described above, the present invention is not limited by the description and drawings in this form. That is, it goes without saying that all other forms, examples, operational techniques, and the like made by those skilled in the art based on this form are included in the category of the present invention.

1 X-ray inspection device 2 Conveyor device 2a Conveyor belt 3 X-ray generator 4 X-ray detector 5 Setting input unit 6 Signal processing unit 7 Display unit 11 Storage means 12 External part area extraction means 13 Contents area extraction means 14 Contents Containment area calculation means 14a Reference line calculation means 14b Neighborhood line calculation means 15 Seal area calculation means 16 Seal defect determination means W Inspected object Wa Unnecessary object X Transport direction S1 Outer part area S2 Contents area S3 Seal area S4 Contents Containment area L1 Reference line L2 (L2a, L2b) Adjacent line L3 (L3a, L3b) Neighbor line L4 Extension reference line L5 Straight line

Claims (4)

The object to be inspected (W) whose contents are wrapped in a packaging material and whose outside of the contents accommodating area (S4) for accommodating the contents is sealed is irradiated with X-rays while being conveyed at predetermined intervals. An X-ray inspection apparatus (1) that inspects the inspected object using a transmitted image of X-rays that have passed through the inspected object.
An outer shape area extraction means (12) for extracting the outer shape region (S1) of the object to be inspected (W) from the transparent image, and
A content region extraction means (13) for extracting the content region (S2) of the object to be inspected from the transparent image, and
A reference line (L1) corresponding to a part of one side where the contents of the contents accommodating area are offset is calculated from the contour of the contents in the contents area, and the contents obtained based on the reference line. Content storage area extraction means (14) for extracting the content storage area (S4), and
The seal portion for calculating the seal portion region (S3) by excluding the content accommodating region extracted by the content accommodating region extraction means from the outer shape region of the object to be inspected extracted by the outer shape region region extraction means. Area calculation means (15) and
An X-ray inspection apparatus including a signal processing unit (6) including a seal defect determining means (16) for determining the presence or absence of a seal defect depending on whether or not there is an unnecessary substance in the seal unit region. .. The content accommodating area extraction means (14) includes a reference line calculating means (14a) for calculating the reference line (L1) by linearly approximating the contour of the content in the content area.
A neighborhood line (L3) that is a part of an adjacent side adjacent to the reference side of the content accommodating area (S4) formed by extending the reference line is a straight line with respect to the contour of the content in the content area. X-ray examination apparatus according to claim 1, characterized in that a neighboring line calculation means (14b) which is calculated by approximation. The reference line calculating means (14a) refers to the midpoint of an approximate straight line that linearly approximates the contour of the contents in the contents area corresponding to the position of the reference side of the contents accommodating area (S4). The X-ray inspection apparatus according to claim 2 , wherein a reference line (L1) is calculated. The object to be inspected (W) whose contents are wrapped in a packaging material and whose outside of the contents accommodating area (S4) for accommodating the contents is sealed is irradiated with X-rays while being conveyed at predetermined intervals. An X-ray inspection method for inspecting an object to be inspected using a transmitted image of X-rays transmitted through the object to be inspected.
A step of extracting the outer shape region (S1) of the object to be inspected from the transparent image, and
A step of extracting the content region (S2) of the object to be inspected from the transparent image, and
A reference line (L1) corresponding to a part of one side where the contents of the contents accommodating area are offset is calculated from the contour of the contents in the contents area, and the contents obtained based on the reference line. Steps to extract the storage area and
A step of calculating the seal portion region (S3) by excluding the content accommodating region from the outer shape portion region of the object to be inspected, and
An X-ray inspection method comprising a step of determining the presence or absence of a seal defect depending on whether or not there is an unnecessary substance in the seal portion region.

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