JP2019078686A - X-ray inspection device and x-ray inspection method - Google Patents

Abstract

To determine the presence of unnecessary substances in a seal region with higher accuracy than conventionally possible and inspect seal failure.SOLUTION: When irradiating a test object in which the outside of a content storing region S4 is sealed where the content of a packaging medium is stored with an X-ray while conveying it at prescribed time intervals and inspecting the test object using a transmission image based on the transmitted amount of X-ray detected after having transmitted the test object, a reference line L1 equivalent to one portion on one side of the content storing region S4 is calculated from the contour of the content in a content region S2, a seal region S3 is specified excluding the content storing region S4 obtained on the basis of the reference line L1 from an outline region S1 of the test object, and the presence of seal failure is determined by whether or not there is an unnecessary substance in the seal region S3.SELECTED DRAWING: Figure 5

Description

  The present invention irradiates X-rays to an inspection object to be transported, and an X-ray inspection apparatus and an X-ray inspecting a seal defect of the inspection object using a transmission image of X-rays when the X-rays are irradiated. It relates to the inspection method.

  The X-ray inspection apparatus is an apparatus which inspects an inspection object by using, for example, raw meat, fish, processed food, medicine and the like as an inspection object and X-ray transmission image when the inspection object is irradiated with X-rays As conventionally known.

  For example, in the X-ray inspection apparatus described in Patent Document 1 below, the outer shape is extracted from the transmission image when the X-ray is irradiated to the inspection object, and based on the seal portion information set in advance based on the extracted outer shape. The seal area of the inspection object is calculated, and the seal defect is inspected using the calculated density level of the image of the seal area.

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

JP 2005-024549 A JP 2005-091015

  However, in the X-ray inspection apparatus of Patent Document 1 or Patent Document 2 described above, when the seal portion region is specified based on the outer shape or the product size and the seal width are set, the packaging material is bent and the outer shape is deformed, There is a possibility that the area which is not the seal part area may be calculated as the seal part area, and there is a problem that the seal part area can not be identified correctly. Also, if the seal area is specified based on the contents, there is a problem that the seal area can not be correctly specified unless the shape of the contents stored in the packaging material is stable. . As a result, there is a possibility that something caught inside the seal portion area may be overlooked.

  Therefore, the present invention has been made in view of the above problems, and an X-ray inspection apparatus capable of inspecting the seal defect by determining the presence or absence of an unnecessary object in the seal portion area with higher accuracy than in the prior art. And the purpose is to provide an X-ray examination method.

In order to achieve the above object, in the X-ray inspection apparatus according to claim 1 of the present invention, the object is sealed with the outside of the content storage area S4 in which the content is wrapped in a packaging material and the content is stored. An X-ray examination apparatus 1 which irradiates X-rays while conveying an inspection object W at predetermined intervals, and inspects the inspection object using a transmission image of X-rays transmitted through the inspection object,
A reference line L1 corresponding to a part of one side of the content storage area is calculated from the contour of the content in the transmission image, and the content storage area obtained based on the reference line is the inspection target in the transmission image A signal processing unit 6 is provided which identifies the seal area S3 excluding the outer area S1 of the object, and determines the presence or absence of a seal defect based on whether or not there is an unnecessary object in the seal area. .

An X-ray examination apparatus according to claim 2 is the X-ray examination apparatus according to claim 1
The signal processing unit 6 extracts outer portion area extraction means 12 for extracting an outer portion area S1 of the inspection object W from the transmission image;
Content area extraction means 13 for extracting the content area S2 of the inspection object from the transmission image;
A reference line L1 corresponding to a part of one side on which the contents in the contents storage area are offset is calculated from the outline of the contents in the contents area, and the contents storage obtained based on the reference lines Content accommodation area extraction means 14 for extracting the area S4;
Seal part area calculation for calculating the seal part area S3 by excluding the contents storage area extracted by the contents storage area extracting means from the outer part area of the inspection object extracted by the outer part area extracting means And means 15 are provided.

An X-ray examination apparatus according to a third aspect of the present invention is the X-ray examination apparatus according to the second aspect, wherein
The content storage area extracting means 14 calculates a reference line L1 by performing linear approximation on the contour of the contents in the content area, and calculating the reference line L1;
The neighborhood line L3, which is a part of the adjacent side adjacent to the reference side of the content storage area S4 configured by extending the reference line, is calculated by linear approximation of the outline of the contents in the content area And the neighboring line calculating means 14b.

An X-ray examination apparatus according to a fourth aspect of the present invention is the X-ray examination apparatus according to the third aspect, wherein
The reference line calculation unit 14a sets the reference line L1 on the basis of a midpoint of an approximate straight line obtained by linearly approximating the outline of the contents in the contents area corresponding to the position of the reference side of the contents storage area S4. It is characterized by calculating.

According to the X-ray inspection method described in claim 5, the inspection object W in which the contents are wrapped in the packaging material and the outside of the contents storage area S4 for containing the contents is sealed is transported at predetermined intervals. It is an X-ray inspection method which irradiates X-rays while inspecting the inspection object using a transmission image of X-rays transmitted through the inspection object,
Extracting an outer region S1 of the inspection object from the transmission image;
Extracting the content area S2 of the inspection object from the transmission image;
A reference line L1 corresponding to a part of one side on which the content of the content storage area is present is calculated from the contour of the content in the content area, and the content storage area obtained based on the reference line Extracting step,
Calculating the seal portion area S3 by removing the content storage area from the outer portion area of the inspection object;
And determining the presence or absence of a seal failure based on whether or not there is an unnecessary item in the seal portion area.

  According to the present invention, compared to the conventional case, the presence or absence of an unnecessary object in the seal portion area can be determined with higher accuracy and the seal defect can be inspected, and the quality of the seal defect inspection can be improved. it can.

It is a block diagram showing a schematic structure of an X-ray inspection device concerning the present invention. It is a figure which shows an example of the permeation | transmission image of a to-be-tested object. It is a flowchart which shows the outline | summary procedure of the X-ray-inspection method using the X-ray-inspection apparatus based on this invention. It is a flowchart which shows the calculation procedure of the content accommodation area | region of FIG. It is explanatory drawing which shows an example of the calculation procedure of (a)-(f) content accommodation area | region. (A), (b) It is explanatory drawing which shows an example of the other calculation procedure of a content accommodation area | region.

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

[Summary of the Invention]
The X-ray inspection apparatus according to the present invention is, for example, incorporated in a part of a conveyance line, and for an inspection object (article) sequentially conveyed at regular intervals, to the seal part of the contents packaged in the packaging material. The seal defect is checked by determining the presence or absence of the unnecessary object due to the bite or the like.

  As an inspection object to be inspected, for example, a packaged product in which a sheet-like content in which a sheet including a liquid (such as a face mask or the like) is folded is contained in a packaging material, retort food There are packaging products in which the packaging material is filled with various liquid and gel contents, and packaging products in which the powder content is filling the packaging material.

  For example, in the case of a face mask, a packing product in which a sheet and a liquid are filled from the upper opening forming one side of a three-sided sealed bag-like packaging material and then sealed and four sides are covered The packaging material is sealed at predetermined intervals, and the sheet and the liquid are filled from the open two side surface openings between the sealing portions and then the package is sealed and covered at four sides.

  And in the case of a rectangular (rectangular or square) package finally covered with four sides, the content storage area in which the content is stored is substantially constant, but the content is particularly like a viscous liquid There is a tendency for articles to be transported while being offset to one side (in particular, the center of one side) of the content storage area.

  Therefore, the present invention utilizes the above-mentioned tendency, and the contents from the straight line (reference line) corresponding to a part of one side (side where the contents are offset and stored) in the transmission area of the inspection object A function to identify a storage area, mask a content storage area from an outer part area of an inspection object and specify a seal area by checking whether a seal defect is present or not in the seal area. Have.

[Configuration of X-ray inspection apparatus]
As shown in FIG. 1, the X-ray inspection apparatus 1 according to the present embodiment performs the above-described function, so that the conveyance device 2, the X-ray generator 3, the X-ray detector 4, the setting input unit 5, and the signal processing unit 6 and the display unit 7 are roughly configured.

  The conveyance device 2 sequentially conveys the inspection object W to be inspected on the conveyance path at predetermined intervals, and is configured of, for example, a belt conveyor horizontally disposed with respect to the apparatus main body.

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

  The X-ray generator 3 applies X-rays to the inspection object W transported on the transport path in the transport direction X from the loading port toward the unloading port, and applies electrons and accelerates the electrons to the target It has a cylindrical X-ray tube for generating an X-ray by making an impact and an irradiation slit for irradiating the X-ray generated by the X-ray tube toward the X-ray detector 4.

  The X-ray tube has a configuration in which, for example, a cylindrical X-ray tube provided inside a metal box is immersed in insulating oil, and the anode target is irradiated with an electron beam from the cathode of the X-ray tube and X-rays are emitted. Generate The X-ray tube is provided in a direction orthogonal to the longitudinal direction on the plane of the transport direction of the inspection object W (X direction in FIG. 1), and the generated X-ray is directed to the lower X-ray detector 4 The irradiation slit is formed into a screen by 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 the plane of the transport direction X of the test object W being transported. To explain further, the X-ray detector 4 is configured in an array including a plurality of photodiodes arranged in line and arranged, and a scintillator provided on the line photodiode.

  The X-ray detector 4 detects X-rays transmitted through the inspection object W and the transport belt 2a by a plurality of elements (an array of photodiodes and scintillators), and detects the detected data as a plurality of elements for each element. The output is sequentially output to the signal processing unit 6 as one line, and the output is sequentially repeated as the inspection object W is transported.

  The setting input unit 5 includes, for example, keys, push buttons, switches, and soft keys on the display screen of the display unit 7 provided on the apparatus body.

  The setting input unit 5 has a threshold for extracting the outer region S1 of the inspection object W shown in FIG. 2 and a threshold for extracting the content region S2 when the seal defect of the inspection object W is inspected. A storage limit described later of the signal processing unit 6 is set appropriately according to the type of the inspection object W, the type of foreign matter, etc., of the detection limit value serving as the determination standard of the seal failure based on the presence or absence of the unnecessary It is operated when storing in 11.

  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 storage area S4 of the inspection object W shown in FIG. 2, the length of the reference line L1, the adjacent line The length of L2 and the length of the neighboring line L3 (L3a, L3b) are set and stored in the storage unit 11 of the signal processing unit 6.

  To explain further, the position of the reference side of the content storage area S4 changes in accordance with the above-described packaging process and the transport direction X, and the position of one side of the content storage area S4 in which the content is offset and stored For example, among the four sides of the rectangular (square, rectangular) content storage area S4, one of the upper side, the lower side, the right side, and the left side is set as the position of the reference side in the setting input unit 5 Ru. For example, FIG. 2 shows a state in which the left side of the content storage area S4 is set as the position of the reference side because the content is offset to the left side of the content storage area S4.

  The reference line L1 is a line for specifying the reference side of the content storage area S4, and the length (for example, in mm) is set by the setting input unit 5. The adjacent line L 2 is a line for specifying two adjacent sides adjacent to the reference side of the content storage area S 4, and the length thereof is set by the setting input unit 5. The neighboring line L3 (L3a, L3b) is a line for specifying the position of the adjacent line L2, and the length (for example, in mm) is set by the setting input unit 5.

  As shown in FIG. 1, the signal processing unit 6 is, as shown in FIG. 1, a storage unit 11, an outer portion extraction unit 12, a content region extraction unit 13, a content storage region calculation unit 14, a seal unit region calculation unit 15, and a seal failure determination unit It is comprised including 16.

  The storage unit 11 stores X-ray transmission data of each inspection object W from the X-ray detector 4. The X-ray transmission data is obtained by A / D converting the electric signal from the X-ray detector 4 by an A / D converter (not shown). To explain further, the storage unit 11 is transported at least several hundred X-ray transmission data, for example, several hundred per one line (Y direction) of the X-ray detector 4 every time one inspection object W is inspected. A predetermined number of lines (for example, several hundred lines) corresponding to the length in the transport direction of the inspection object W (corresponding to the detection period from the front end to the rear end) are stored.

  The external part area extracting means 12 detects the entire transmitted image (the inspection object W and the belt surface) having a density level corresponding to the light and shade value which is lighter as the transmission amount is larger from the X-ray transmission data stored in the storage means 11 An image including the image) is generated, and a transmission image of a density level equal to or higher than the threshold value set in the setting input unit 5 is generated from the generated transmission image of the entire area of the packaging material Wa (outline of the inspection object W shown in FIG. Region indicating the inner area) is extracted as S1.

  The external part area extraction means 12 obtains the entire density histogram of the entire transmission image created from the X-ray transmission data stored in the storage means 11, and the data of the inspection object W and the inspection subject from the obtained density histogram For example, in the whole density histogram, the data of the inspection object is 255, the data of the inspection object is 0, and the data is binarized. The data of the inspection object W can also be extracted as the external shape area S1 of the packaging material Wa among the data.

  The content area extraction means 13 uses the threshold value set by the setting input unit 5 and the content Wb of the inspection object W exists in the transmission image of the density level exceeding the threshold value from the transmission image in the outer area S1. A content area (a portion showing the area on the inner side from the outline of the content shown in FIG. 2) is extracted as S2. In addition, the content area extracting means 13 detects the transmitted image of the density level exceeding the threshold set by the setting input unit 5 in parallel with the extraction process of the outer portion area S1 and the content Wb of the inspection object W is present. It may be extracted as the content area S2.

  The image of the content area S2 extracted by the content area extraction means 13 has fine recesses in the outer shape, so N images of the content area S2 are N times after the expansion. It is preferable to perform image processing in which the concave portion of the outer shape is filled by closing processing that shrinks.

  As shown in FIG. 2, the content storage area calculation means 14 calculates a rectangular (square, rectangular) content storage area S4 forming an area for storing the content, and the reference line calculation means 14a. , Neighbor line calculation means 14b.

  As shown in FIG. 2, the reference line calculation means 14a calculates a reference line L1 corresponding to a part of the reference side (one side) of the content storage area S4. To explain further, the reference line calculation means 14a is a part corresponding to the position of the reference side of the content storage area S4 set by the setting input unit 5 with respect to the outline of the content in the content area S2 of the inspection object W Are linearly approximated, and a linear approximation 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 based on the middle point of the approximate straight line which is the straight line approximation of the outline of the contents in the contents area S2 corresponding to the position of the reference side of the contents storage area S4 It calculates so that the middle point of reference line L1 may be in agreement. The approximate straight line is calculated by using a least squares approximation to obtain a straight line with which the sum of the distances to the straight line is minimum with respect to a point group (a set of pixels) constituting the outline of the content.

  As shown in FIG. 2, the neighboring line calculation means 14b calculates a neighboring line L3 (L3a, L3b) corresponding to a part of an adjacent side (two sides) adjacent to the reference side of the content storage area S4. To explain further, the neighborhood line calculation means 14b linearly approximates a portion of the outline of the content in the content area S2 of the inspection object W corresponding to the adjacent side adjacent to the reference side of the content storage area S4. The neighborhood line L3 (L3a, L3b) of the book is calculated.

  As shown in FIG. 2, the content storage area calculation unit 14 extends the two neighboring lines L3 (L3a, L3b) calculated by the neighboring line calculation unit 14b, and calculates the reference line calculation unit 14a. Two adjacent lines L2 (L2a, L2b) starting from the point of intersection with the extension reference line L4 consisting of an approximate straight line 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 and 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 accommodation area S4. Calculated as

  As shown in FIG. 2, the seal part area calculation means 15 is an outer shape of the inspection object W in which the contents storage area S4 calculated by the contents storage area calculation means 14 is extracted by the outer part area extraction means 12. The seal part area S3 is calculated excluding the part area S1.

  As shown in FIG. 2, the seal defect determining means 16 determines the presence or absence of a seal defect based on whether or not there is an unnecessary substance in the seal part area S3 calculated by the seal part area calculating means 15.

  The display unit 7 is formed of a display device such as a liquid crystal display, for example, and the entire image of the inspection object W including the outer area S1, the contents area S2, the seal area S3, and the contents accommodation area S4 Based on the operation of the setting input unit 5, display inspection results such as X-ray transmission images of the inspection object W based on a planar view, the OK / NG judgment results, the total number of inspections, the number of good products, the total number of NG etc. Display on the screen.

[X-ray inspection method]
And the X-ray inspection method which determines the presence or absence of the seal defect of the to-be-inspected object W using the X-ray inspection apparatus 1 comprised as mentioned above is demonstrated using the flowchart of FIG.

  First, the outer portion area S1 of the packaging material of the inspection object W is extracted by the outer portion area 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 transmission 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 following is performed using this reference line L1. Content accommodation area | region S4 is calculated by the calculation method demonstrated to (ST3).

[Method for calculating content storage area]
Hereinafter, a method of calculating the content storage area S4 by the content storage area calculation means 14 will be described with reference to the flowchart of FIG. 4 and the explanatory view of FIG. Here, the position of the reference side of the content storage area S4 of the inspection object W is set to the left side, and the lengths of the reference line L1, the adjacent line L2, and the adjacent lines L3a and L3b are set by the setting input unit 5 It shall be.

  In the case of calculating the content storage area S4, first, the outline of the content of the content area S2 extracted by the content area extraction means 13 is linearly approximated to calculate the reference line L1 (ST11). Specifically, as shown in FIG. 5A, the outline of the content of the content area S2 corresponding to the position of the reference side of the content storage area S4 set by the setting input unit 5 is linearly approximated. A reference line L1 is drawn so that the midpoint of the left side of the outline of the linearly approximated content and the midpoint of the reference line L1 coincide with each other.

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

  Next, two neighboring lines L3a and L3b corresponding to a part of the adjacent side (two sides) adjacent to the reference side of the content storage area S4 are calculated (ST13). Specifically, as shown in FIG. 5C, the outline of the contents of the contents area S2 extracted by the contents area extraction unit 13 is adjacent to the reference side adjacent to the reference side of the contents storage area S4. The corresponding portion is linearly approximated, and the two neighboring lines L3a, L3a, and L3a are set at the length set by the setting input unit 5 with the point of intersection with the extension reference line L4 consisting of an approximation straight line extending both ends of the reference line L1 as a starting point. Subtract L3b.

  Next, based on the two neighboring lines L3a and L3b, two adjacent lines L2 (L2a, L2b) corresponding to the adjacent sides (two sides) adjacent to the reference side of the content storage area S4 are calculated ( ST14). Specifically, as shown in FIG. 5 (d), with a point P1 crossing the extension reference line L4 through one of the neighboring lines L3a as a starting point, one of the lengths set in advance by the setting input unit 5 is Draw the adjacent line L2a. Similarly, with the intersection point P2 crossing the extension reference line L4 passing through the other neighboring line L3b as a start point, the other adjacent line L2b is drawn with a length set in advance by the setting input unit 5. Thus, 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 storage area S4.

  Next, as shown in FIG. 5F, 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 two adjacent lines L3a, L3b and An area surrounded by the straight line L5 is calculated as the content storage area S4 (ST3).

  Next, the seal part area calculation means 15 extracts the contents storage area S4 calculated by the contents storage area calculation means 14 as described above by the inspection object W extracted by the external part area extraction means 12 The seal area S3 is calculated excluding the outer area 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 item in the seal part area S3 calculated by the seal part area calculation means 15 (ST5), and the determination processing is ended.

[Modification]
By the way, in the embodiment described above, when the external dimensions of the substantially constant content storage area S4 are known in advance, the external dimensions (vertical and horizontal sizes) of the content storage area S4 are input from the setting input unit 5 As shown in FIG. 6 (a), a U-shape obtained from an extended reference line L4 consisting of an approximate straight line extending the reference line L1 and the two neighboring lines L3 (L3a, L3b) by the above-described calculation method Position the content storage area S4 of the external dimension 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 storage area S4) to specify the seal portion area S3 It is also good.

  Then, the seal part area S3 is calculated by excluding the content storage area S4 obtained as described above from the external part area S1 of the inspection object W extracted by the external part area extraction means 12, and the seal part calculated The seal failure determination means 16 determines the presence or absence of a seal failure based on whether or not there is an unnecessary item in the region S3. For example, in the example of FIG. 6 (b), since the unnecessary part Wa (black part in the figure) is present in the seal part area S3, the seal defect determination 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 storage area is specified from the straight line of a part of one side of the content storage area in which the content is stored. The content accommodation area is masked from the outer area area to identify 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 is dispersed, the reliability of the seal portion area to be specified becomes high, compared with the conventional case. A seal defect can be inspected by determining the presence or absence of an unnecessary substance in the seal portion area more accurately, and the quality of the seal defect inspection can be improved.

  Although the best mode 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 the drawings according to this mode. That is, it is a matter of course that all other forms, examples, operation techniques and the like made by those skilled in the art based on this form are included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 X-ray inspection apparatus 2 conveyance apparatus 2a conveyance belt 3 X-ray generator 4 X-ray detector 5 setting input part 6 signal processing part 7 display part 11 storage means 12 outline part area extraction means 13 content object area extraction means 14 content object Containment area calculation means 14a Reference line calculation means 14b Neighboring line calculation means 15 Seal part area calculation means 16 Seal defect judgment means W Inspection object Wa Unnecessary object X Conveyance direction S1 Outer part area S2 Content area S3 Seal part area S4 Content Containment area L1 Reference line L2 (L2a, L2b) Adjacent line L3 (L3a, L3b) Neighboring line L4 Extension reference line L5 Straight line

Claims (5)

The X-ray is irradiated while transporting the test object (W) whose contents are wrapped in a packaging material and the outside of the content storage area (S4) for storing the contents is sealed at a predetermined interval, An X-ray inspection apparatus (1) for inspecting the inspection object using a transmission image of X-rays transmitted through the inspection object,
A reference line (L1) corresponding to a part of one side of the content storage area is calculated from the contour of the content in the transmission image, and the content storage area obtained based on the reference line is the content line in the transmission image. A signal processing unit (6) for identifying the seal area (S3) excluding the outer area (S1) of the inspection object and determining the presence or absence of a seal defect based on whether or not there is an unnecessary object in the seal area. An X-ray inspection apparatus comprising: The signal processing unit (6) is an outer area extracting unit (12) for extracting an outer area (S1) of the inspection object (W) from the transmission image.
A content area extraction unit (13) for extracting a content area (S2) of the inspection object from the transmission image;
A reference line (L1) corresponding to a part of one side where the contents of the contents containing area are offset from the contour of the contents in the contents area is calculated, and the contents obtained based on the reference lines Content accommodation area extraction means (14) for extracting the object accommodation area (S4);
A seal unit that calculates a seal area (S3) by excluding the content storage area extracted by the content storage area extraction means from the outer area of the inspection object extracted by the outer area extraction means 2. An X-ray examination apparatus according to claim 1, further comprising a region calculation means (15). Said content storage area extracting means (14) is a reference line calculating means (14a) for calculating the reference line (L1) by linear approximation of the outline of the content in the content area;
The neighbor line (L3) which is a part of the adjacent side adjacent to the reference side of the content-accommodating area (S4) configured by extending the reference line is a straight line with respect to the outline of the content in the content area 3. An X-ray examination apparatus according to claim 2, further comprising: neighboring line calculation means (14b) which calculates by approximation. The reference line calculation means (14a) is based on a midpoint of an approximate straight line obtained by linearly approximating the outline of the contents in the contents area corresponding to the position of the reference side of the contents storage area (S4). The X-ray examination apparatus according to claim 3, wherein a reference line (L1) is calculated. The X-ray is irradiated while transporting the test object (W) whose contents are wrapped in a packaging material and the outside of the content storage area (S4) for storing the contents is sealed at a predetermined interval, An X-ray inspection method for inspecting the inspection object using a transmission image of X-rays transmitted through the inspection object,
Extracting an outer portion area (S1) of the inspection object from the transmission image;
Extracting a content area (S2) of the inspection object from the transmission image;
A reference line (L1) corresponding to a part of one side where the content of the content storage area exists is calculated from the contour of the content in the content area, and the content storage obtained based on the reference line Extracting an area;
Calculating the sealed portion area (S3) by removing the content storage area from the outer portion area of the inspection object;
And D. determining the presence or absence of a seal failure based on whether or not there is an unnecessary item in the seal portion area.

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