JP3875842B2 - X-ray foreign object detection apparatus and defective product detection method in the apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention, for example, X-ray foreign matter for detecting foreign matter in the inspection object from the amount of X-ray transmission when X-rays are irradiated to the inspection object of various varieties such as raw meat, fish, processed food, and medicine More particularly, the present invention relates to an X-ray foreign matter detection device capable of accurately detecting a defective product of an inspection object and a defective product detection method in the device.
[0002]
[Prior art]
The X-ray foreign object detection device irradiates X-rays on various types of inspection objects (raw meat, fish, processed foods, medicines, etc.) that are sequentially transported on the transport line, and the amount of transmitted X-rays. This is a device that detects whether or not a foreign object such as metal, glass, stone, or bone is mixed in the inspection object.
[0003]
FIG. 10 is a perspective view showing a conventional X-ray foreign object detection apparatus of this type. As shown in the drawing, an X-ray generator 51 and an X-ray detector 52 are arranged opposite to each other at a position along the conveyor 50 where the inspection object W is being conveyed. The X-ray generator 51 emits X-rays to the object W being transported, and the X-ray detector 52 is an electric signal (X-ray transmission data) corresponding to the amount of X-rays transmitted through the object W to be inspected. Is output. A processing means (not shown) determines the presence or absence of foreign matter based on the amount of X-ray transmission.
[0004]
FIG. 11 is a view showing an X-ray transmission image of the object W to be inspected. In the example of FIG. 11A, the state in which the inspection object W is accommodated on the container is displayed. This kind of X-ray foreign matter detection apparatus detects the presence or absence of the inspection object W in the container T such as a tray or a box at the stage of the pre-processing for determining the presence or absence of contamination in the inspection object W. Some products (goods) are identified.
[0005]
This shortage determination process is determined by the processing means executing image processing. In the image processing unit, as shown in the figure, a missing item detection mask region M is set in advance at the coordinate axis position assuming the accommodation position of the inspection object W on the container T.
Then, the inspection object W that has been input and developed as shown in the figure overlaps the missing item detection mask area M, and the inspection object W exists on the position of the missing item detection mask area M. If it does not exist normally, it is determined as a missing item, and a signal indicating that the item is missing (defective) is output to the outside.
[0006]
[Problems to be solved by the invention]
However, in the conventional shortage determination process, the inspection object W is determined to be a shortage if the inspection object W does not completely overlap the portion of the shortage detection mask area M. Even if the inspection object W exists on the container T, it may be erroneously determined to be a missing item.
This missing item detection mask region M is set by the operator of the apparatus with a predetermined range on a predetermined coordinate axis position. At this time, the operator has set the coordinate axis position and range in consideration of the movement (position shift) of the inspection object W on the container T.
Briefly, when the size of the inspection object W is ¼ or more of the size (area) of the container T, the inspection object W moves within the container T. However, there is always a position where the inspection object W exists. The coordinate axis position and range were set assuming this position.
[0007]
Therefore, as shown in FIG. 11B, when the inspection object W is inspected by the X-ray foreign matter detection apparatus 50, the position of the inspection object W is moved on the container T, and the missing item detection is performed. If a part of the mask area M is positioned outside the inspection object W, it is erroneously determined as a missing item.
Thus, in the past, experience and intuition were required for setting the missing part detection mask region M, and it was often erroneously determined as a missing part.
[0008]
The present invention has been made in view of the above problems, and an object of the present invention is to provide an X-ray foreign object detection device capable of accurately detecting a defective product and improving the reliability of the device, and a defective product detection method in the device. .
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the X-ray foreign object detection device according to the first aspect of the present invention exposes an X-ray to an object to be inspected (W) accommodated in a container (T). In the X-ray foreign matter detection device (1) for detecting the presence or absence of foreign matter in the inspection object from the amount of X-ray transmitted through the inspection object as a result of exposure to
A mask area setting section (17a) for setting a mask area (M) for detecting a missing part of the inspection object having a predetermined range of a size smaller than the inspection object at a predetermined position inside the container;
An inspection object extraction unit (17b) that extracts an image area (A) of the inspection object from the developed image of the inspection object including the container based on the X-ray transmission amount;
A ratio of the image area of the inspection object extracted by the inspection object extraction unit included in the mask area set by the mask area setting unit is detected, and if the ratio exceeds a predetermined value set in the container, An out-of-stock determination unit (17c) that determines that an object to be inspected is stored and determines that the object to be inspected is a defective product that is not stored in the container when the ratio is lower than the predetermined value;
It is provided with.
According to a second aspect of the present invention, there is provided the X-ray foreign object detection device according to the first aspect, wherein the mask region setting section (17a) is disposed on the container (T). A mask area (M) for missing item detection is individually set for the plurality of inspected objects (W) accommodated,
The missing item determination unit (17c) detects the ratio of the image area of the inspection object extracted by the inspection object extraction unit included in the mask area for each mask area set by the mask area setting unit. If the ratio exceeds a predetermined value set in advance, it is determined that the object to be inspected is contained in the container. If the ratio is lower than the predetermined value, the object to be inspected is not contained in the container. It is characterized by judging that it is a non-defective product.
[0010]
Moreover, the X-ray foreign material detection device of the present invention described in claim 3 is the X-ray foreign material detection device according to any one of claims 1 or 2, wherein the mask region setting unit (17a) includes: One end of the container (T) is detected as a reference position (RF), and a mask area (M for detecting a missing part of the inspection object having a predetermined range at a predetermined position inside the container with reference to the reference position. ) May be set.
[0011]
According to a fourth aspect of the present invention, there is provided the X-ray foreign object detection device according to any one of the first to third aspects, wherein the shortage determination unit (17c) includes: An area ratio (B) in the developed image is preset as the ratio,
A value obtained by multiplying the total number of pixels (n) of the mask region (M) set by the mask region setting unit (17a) by the area ratio, and the inspection object extraction unit (17b) included in the mask region Is compared with the total number of pixels (CNT) of the image area (A) of the inspection object extracted, and if the total number of pixels of the inspection object is large, it is determined that the inspection object is accommodated in the container, If there are few, it can also be set as the structure judged as the inferior goods which are not accommodated.
[0012]
According to a fourth aspect of the present invention, there is provided a method for detecting a defective product in an X-ray foreign matter detecting apparatus according to the present invention, wherein an X-ray is exposed to an object to be inspected (W) accommodated in a container (T). Applied to the X-ray foreign matter detection device (1) for detecting the presence or absence of foreign matter in the inspection object from the transmission amount of X-rays transmitted through the inspection object along with the irradiation, and inspecting in the container A defective product detection method for detecting the presence or absence of an object,
A mask area (M) for detecting a missing part of the inspection object having a predetermined range of a size smaller than the inspection object at a predetermined position inside the container,
Extracting the image area (A) of the inspection object from the developed image of the inspection object including the container based on the X-ray transmission amount,
A ratio of the image area of the inspection object extracted by the inspection object extraction unit included in the mask area set by the mask area setting unit is detected, and if the ratio exceeds a predetermined value set in the container, It is determined that an object to be inspected is stored, and when the ratio is lower than the predetermined value, it is determined that the object to be inspected is a defective product that is not stored in the container.
[0013]
According to the above configuration, the mask region setting unit 17a sets the mask region M for missing item detection with a predetermined range at a predetermined position with the container T as a reference. The inspection object extraction unit 17b extracts the extracted image A of the inspection object W from the container T based on the X-ray transmission amount of the developed image. If the ratio of the extracted image A of the inspection object W included in the mask region M exceeds a predetermined value, the shortage determination unit 17c determines that the inspection object is stored in the container, and the ratio is the predetermined value. If it is lower, it is determined that the object to be inspected is not defective in the container. Thereby, even when the inspection object W moves in the container T and only a part of the extracted image A is included in the mask area M, it is possible to prevent erroneous detection as a missing item by the determination using the ratio. Can detect defective products.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a perspective view showing an external appearance of the X-ray foreign object detection device.
The X-ray foreign matter detection apparatus 1 is provided in a part of the transport line and detects the presence or absence of foreign matter mixed in the inspection object W (including the surface) that is sequentially transported at a predetermined interval. In this X-ray foreign matter detection apparatus 1, a transport unit 3 and a foreign matter detection unit 4 are provided inside the apparatus main body 1a, and a display 7 is provided at the upper front of the apparatus main body 1a.
[0015]
The transport unit 3 transports, for example, test articles W of various varieties such as raw meat, fish, processed food, and medicine. In this embodiment, the test object W is stored in a container T such as a tray, pack, or box. It is designed to be transported in a state that has been performed.
This conveyance part 3 is comprised with the belt conveyor arrange | positioned horizontally with respect to the apparatus main body 1a. The conveyance unit 3 conveys the inspection object W carried from the carry-in port 3a toward the carry-out port 3b (carrying direction X in the drawing) at a predetermined carrying speed set in advance by driving of the drive motor 6.
[0016]
The foreign matter detection unit 4 detects foreign matter in the middle of the transport path of the workpiece W to be transported, and an X-ray generator 8 provided at a predetermined height above the transport unit 3 and the transport unit 3 An X-ray detector 9 provided to face the X-ray generator 8 is provided.
[0017]
The X-ray generator 8 has a configuration in which a cylindrical X-ray tube 12 provided in a metal box 11 is immersed in an insulating oil (not shown), and an electron beam from the cathode of the X-ray tube 12 is an anode target. X-rays are generated by irradiation. The X-ray tube 12 is provided in a direction (Y direction) whose longitudinal direction is orthogonal to the conveyance direction X of the inspection object W. The X-rays generated by the X-ray tube 12 are exposed to the lower X-ray detector 9 in the form of a substantially triangular screen by a slit (not shown) along the longitudinal direction.
[0018]
The X-ray detector 9 detects X-rays that pass through the inspection object W when the X-rays are exposed to the inspection object W, and according to the detected transmission amount of the X-rays. An electrical signal is being output. The X-ray detector 9 is provided along the Y direction orthogonal to the transport direction X of the inspection object W transported on the transport unit 3. The X-ray detector 9 is an array line sensor including a plurality of photodiodes arranged in a line and a scintillator provided on the photodiode.
[0019]
In the X-ray detector 9 having such a configuration, when X-rays are exposed to the inspection object W from the X-ray generator 8, the X-rays transmitted through the inspection object W are received by the scintillator. And convert it to light. Further, the light converted by the scintillator is received by a photodiode disposed below the light. Each photodiode converts the received light into an electrical signal and outputs it. The X-ray detector 9 outputs an electrical signal having a level corresponding to the intensity of the received X-ray to the processing means 13.
[0020]
FIG. 2 is a block diagram showing an electrical configuration of the apparatus.
The processing means 13 is constituted by a CPU and the like and a memory and the like, and X-ray transmission data is input from the X-ray detector 9. The X-ray transmission data is A / D converted by an A / D converter (not shown) and then stored in the data memory 14.
In the data memory 14, the 640 pieces of X-ray transmission data per line (Y direction) are at least the length in the transport direction X of the object W to be transported (detection period from the front end Wa to the rear end Wb). ) Is stored (for example, 480 lines). Based on this data, the processing means 13 inspects the contamination of the object W to be inspected.
[0021]
The conveyance unit 3 is provided with a position detector 10 such as a light projecting / receiving sensor that detects the container T including the inspection object W. The processing means 13 receives the output of the position detector 10 and uses the output at the time when the tip of the container T shields the light projecting / receiving position as a start trigger, and the shielding period is the length of the inspection object W ( The detection period of the container T is determined, and X-ray transmission data for each object W is taken into the data memory 14.
[0022]
The contents of the inspection process include whether or not foreign matter such as metal, glass, stone, or bone is mixed in the inspection object W based on an electrical signal corresponding to the transmission level of X-rays transmitted through the inspection object W. Make a decision. As a basic principle, when a state in which X-rays do not transmit due to foreign matter occurs, that is, when the value of the amount of X-ray transmission is low, it is determined that foreign matter is mixed and a selection signal or the like is output to the outside. Further, the image data obtained by directly developing the input data is output to the display unit 15 of the display unit 7 via the image processing unit 16.
[0023]
The processing means 13 is provided with a shortage detection unit 17 that determines the presence or absence (out of stock) of the inspected object W in the container T prior to the defective product discrimination processing related to the contamination. The missing part detection unit 17 is one function related to image processing in the image processing unit 16.
[0024]
The missing item detection unit 17 includes a mask region setting unit 17a, an inspection object extraction unit 17b, and a missing item determination unit 17c.
In the mask area setting unit 17a, a missing part detection mask area M having a predetermined range at a predetermined coordinate axis position on the X-ray transmission image of the inspection object W is set.
[0025]
FIG. 3 is a diagram showing the missing item detection mask region M. As shown in FIG.
As shown in the figure, the shortage detection mask area M is set with a predetermined range on a predetermined coordinate axis position within the range of the container T with reference to the container T. The container T is developed with the signal input timing of the start trigger whose tip is blocked by the position detector 10 during transport of the transport unit 3 as a reference position RF.
The missing item detection mask region M is also based on the reference position RF of the X-ray transmission image of the container T, and is a predetermined range xL from the coordinate axis position x, y set in synchronization with the start trigger signal input. , YL. The set shortage detection mask area M has a predetermined number of pixels (number of dots) n.
[0026]
The inspection object extraction unit 17b extracts an X-ray transmission image of the inspection object W accommodated on the container T. The container T and the inspection object W have different X-ray transmission amounts, and the inspection object W generally has a lower X-ray transmission amount.
FIG. 4 is a diagram showing an extracted image A of the inspection object W. A threshold is provided in the vicinity of a substantially intermediate level between the X-ray transmission amounts of the container T and the inspection object W, and it is determined that the region where the X-ray transmission amount is lower than the threshold value is the inspection object W, and this range is extracted image A. Extract as Although not shown in detail, the X-ray transmission image after image expansion displayed on the display unit 15 or the like has a different display density according to the X-ray transmission amount.
[0027]
The missing item determination unit 17c calculates a logical product of the image (X-ray transmission image) after the X-ray transmission data of the inspection object W is developed and each image information of a preset missing item detection mask area. Judge the product. At the time of determination, a shortage is determined based on the area ratio B using a predetermined area ratio B. The area ratio B is an arbitrary value in the range of 0 <B ≦ 100 (%).
[0028]
Next, an X-ray foreign object detection operation with the above configuration will be described.
In the X-ray foreign matter detection apparatus 1 configured as described above, when the inspection object W is carried in from the carry-in port 3a of the conveyance unit 3, the X-ray generator 8 sends the inspection object W to the inspection object W during the conveyance process. Is exposed. X-rays that pass through the inspection object W with the X-ray exposure are detected by the X-ray detector 9.
Then, the processing means 13 determines whether or not foreign matter is mixed in the inspection object W based on an electrical signal corresponding to the amount of X-ray transmission detected by the X-ray detector 9, and the determination result A sorting signal indicating a non-defective product or a defective product is output externally. Specifically, when the detected X-ray transmission amount of the inspected object W is equal to or less than a threshold set for detecting foreign matter, it is determined that foreign matter is mixed. Then, the inspection object W that has been subjected to the inspection is sorted into a non-defective product and a defective product according to a sorting signal output from the processing means 13.
[0029]
Further, the image processing unit 16 of the processing unit 13 displays and outputs image data indicating the X-ray transmission amount output from the X-ray detector 9 on the display unit 15. The state of the outer shape of the inspection object W including the container T viewed from the plane and the X-ray transmission state in the inspection object W can be confirmed, and the display density of the foreign matter portion is different from others (darker). , Or other colors) and the position where the foreign substance is mixed can be grasped.
Also, the pass / fail judgment results of “OK” and “NG”, and the inspection results of the total number of inspections, the number of non-defective products, and the total number of NG are displayed.
[0030]
Here, the processing means 13 compares the data stored in the data memory 14 with a reference value, and determines that the data exceeding the reference value is NG if any one line is included. Strictly speaking, when the X-ray transmission amount is lower than the reference value (when X-rays do not pass through due to foreign matter), it is determined as NG, and when the X-ray transmission amount is higher than the reference value, it is determined as OK. , “NG” or “OK” is displayed.
[0031]
Next, the defective product detection operation in the above configuration will be described. FIG. 5 is a flowchart showing the defective product detection process.
Prior to the foreign matter detection operation, the shortage detection unit 17 detects the presence or absence of the inspection object W in the container T (such as a shortage or a defect).
The image processing unit 16 develops the X-ray transmission data output from the X-ray detection unit 9 as an X-ray transmission image in a state including the container T and the inspection object.
The missing part detection unit 17 captures this image (S1). Based on the acquired X-ray transmission image, the reference position RF of the container T is detected (S2). This reference position RF is a time when the position detector 10 detects the leading position of the container T, and corresponds to the position of the leading edge (one end) of the container T in the X-ray transmission image.
[0032]
When the reference position RF of the container T is detected, the mask area setting unit 17a simultaneously sets the coordinate axis positions x and y shown in FIG. 3 with reference to the reference position RF (S3). Then, a missing part detection mask region M having a size of a predetermined range xL, yL is cut out from the coordinate axis positions x, y (S4).
Further, as shown in FIG. 3, the inspection object extraction unit 17b extracts an extraction image A of only the inspection object W excluding the container T from the X-ray transmission image (S5).
[0033]
The missing item determination unit 17c superimposes the missing item detection mask area M and the extracted image A of the inspection object W with reference to the reference position RF, and calculates the logical product of each pixel (S6).
The AND operation is performed by scanning in units of pixels, and if the extracted image A of the inspection object W is positioned within the shortage detection mask area M in the overlapped state, the pixels one by one. Counts (S7).
As described above, the cutout missing part detection mask area M has the number of pixels n, and the count value CNT is up to the number of pixels of the extracted image A of the inspection object W included in the missing part detection mask area M. Will increase.
[0034]
FIG. 6 is a diagram illustrating a state in which the inspection object W is normally stored in the container T. The figure shows a state in which the missing part detection mask region M and the extracted image A of the inspection object W are superimposed. In the state shown in the figure, since all of the extracted images A of the inspection object W are included in the missing part detection mask area M, the count value CNT matches the number n of pixels in the missing part detection mask area M (strictly speaking, almost exactly). Value).
[0035]
Then, the shortage determination unit 17c compares the count value CNT with the number of pixels n × the area ratio B of the shortage detection mask region M. If the count value CNT is higher, the count value CNT is “OK”. If it is lower, “NG (out of stock)” is determined (S8). In the case of NG, external output is performed to indicate that the inspected object W does not exist in the container T (S9). For example, a display output indicating a shortage state is performed on the display unit 15 or a defective product discharge signal is output to the outside of the subsequent sorting machine.
In the example of FIG. 6, since the count value CNT substantially matches the number of pixels n in the missing part detection mask area M, it is determined that “OK”, that is, the inspection object W exists in the container T.
[0036]
FIG. 7 is a diagram showing a missing item state of the inspection object W. As shown in FIG.
As shown in the drawing, when the inspection object W is not present in the container T (out of stock), the missing item detection mask area M and the extracted image A of the inspection subject W are overlapped. Since the extracted image A of the inspection object W is not included in the product detection mask area M, the count value CNT becomes 0 (strictly, a value close to 0 as far as possible).
In this case, since the count value CNT is lower than the number of pixels n × area ratio B of the missing part detection mask region M, it is determined as “NG (out of stock)”.
[0037]
FIG. 8 is a diagram illustrating a detection state of the inspection object W based on the area ratio.
At the time of X-ray detection, the inspection object W may be detected while being moved in the container T. Due to the difference in relative size between the container T and the inspection object W, the inspection object W can move within a predetermined range within the container T. The movable range varies depending on the type of the inspection object W, the packaging form, and the like.
[0038]
In the illustrated case, in a state where the missing item detection mask area M and the extracted image A of the inspection object W are overlapped, the extracted image A of the inspection object W is partially in the missing item detection mask area M (for convenience, Only about 50% of the half portion), and is not included in the entire shortage detection mask region M. In this case, the count value CNT is approximately 2 / n.
Here, if 40% is set as the area ratio B, the count value CNT is higher than the number of pixels n × the area ratio B (50%) in the missing part detection mask region M. The determination result is “OK”, that is, it can be determined that the inspection object W exists in the container T.
[0039]
Thus, although the inspection object W actually exists in the container T, the above-described area ratio can be obtained even when the inspection object W is detected in the movement state in the moving state T. By setting B, it is possible to prevent erroneous determination of “NG (out of stock)”, and it is possible to improve the reliability of stockout discrimination.
[0040]
The area ratio B is an appropriate value in consideration of the movable range of the object W within the container T due to the relative size difference between the container T and the object W (extracted image A). (0 <B ≦ 100 (%) may be set.
By setting the area ratio B and determining the shortage, the shortage detection mask region M in the mask region setting unit 17a may be set roughly within the range of the container T so that the setting can be easily performed. Become. That is, strictness is not required for the coordinate axis positions x and y and the predetermined ranges xL and yL of the setting items. For example, if the area ratio B is 10%, the extracted image A is included in the total number of pixels n in the missing item detection mask area M. If the pixel count value CNT is detected by 10%, it can be determined as “OK”.
[0041]
The coordinate axis positions x and y and the predetermined ranges xL and yL, which are the setting items of the missing item detection mask area M, are used to convey the inspection object W when the initial setting is performed before foreign matter inspection (including missing item determination). It is also possible to set by conveying with.
A plurality of samples of inspection objects W accommodated in the container T without missing items are prepared, and while being transported by the transport unit 3, the above setting items can be changed to check a value that allows “OK” determination. At this time, it is possible to determine that the set value is the best when the coordinate axis positions x and y are moved to various places in the container T, and the ranges xL and yL are changed in size to become “OK” for all samples.
[0042]
On the other hand, it can be determined that the set value when the area ratio B is varied before and after the setting of the setting item for the missing item detection mask region M is set to “OK” for all the samples is the best.
In addition to the above, when setting items of the missing part detection mask region M and the area ratio B, all of the samples in which the inspection object W is not accommodated in the container T are “NG”, that is, defective products. Make sure that it is determined.
[0043]
Next, FIG. 9 is a diagram illustrating another example of the container T.
Depending on the type of the article, there may be a case where a plurality of objects W are accommodated in a single container T having a plurality of partitions Ta1 to Tan as shown in the figure.
In such a case, the missing item inspection mask areas M1 to Mn may be individually set in each partition Ta, and the missing item can be detected in the same manner as described above.
On the other hand, as shown by the dotted line in FIG. 9, the cutout range at the time of execution of the cutout process (S4) of the missing item detection mask region M shown in the flowchart of FIG. It can also be cut out. At the time of the counting process (S7), the image may be scanned in units of columns, and the count of the extracted image A that overlaps the two missing item detection mask areas M1 and M2 may be simultaneously performed in parallel.
[0044]
In the above-described embodiment, the reference position RF is obtained by detecting the tip position in the transport direction of the inspection object W including the container T with the position detector 10. However, the present invention is not limited to this, and the reference position RF may be set by detecting the tip position of the container T based on the X-ray transmission amount during image processing in the image processing unit 16. In this case, the position detector 10 is unnecessary.
[0045]
In the above-described embodiment, one missing piece detection mask region M is set for one inspection object W. However, two or more missing pieces are provided for one inspection object W. If the product detection mask region M is set, it is possible to detect a defect such as a partial chipping of the inspection object W in addition to the detection of the shortage of the inspection object W.
[0046]
The varieties of the test object W and the container T will be described in detail. There is a “ramen” in which dry noodles and “tsuyu” are stored in a film-shaped container T. In this case, dry noodles are the target of X-ray foreign matter detection. Then, “tsuyu” is the target of missing item detection. In the container T, since the “tsuyu” is small with respect to the dry noodles, the storage position easily moves.
Further, as a specific example of the container T having a plurality of partitions, there is “sake sale” accommodated in one box, and this “sake sale” is an object of X-ray foreign object detection and missing item detection.
[0047]
【The invention's effect】
According to the present invention, it is possible to easily detect the presence or absence of an object to be inspected inside the container by X-ray detection. Even if the inspection object moves inside the container and the entire inspection object is not included in the missing part detection mask area, it is determined that the inspection object is stored if the set ratio is exceeded. Due to the configuration, it is possible to prevent the erroneous determination that the product is missing when part of it overlaps, and to improve the reliability of defective product detection.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an external appearance of an X-ray foreign object detection device according to the present invention.
FIG. 2 is a block diagram showing an electrical configuration of an X-ray foreign object detection device according to the present invention.
FIG. 3 is a view showing a missing part detection mask region;
FIG. 4 is a diagram showing an extracted image of an inspection object.
FIG. 5 is a flowchart showing defective product detection processing;
FIG. 6 is a view showing a state in which an object to be inspected is normally stored in the container.
FIG. 7 is a diagram showing a state where an inspection object is out of stock.
FIG. 8 is a diagram for explaining a determination process based on an area ratio.
FIG. 9 is a view showing another configuration example of the container.
FIG. 10 is a perspective view showing a configuration of an X-ray foreign object detection device.
FIG. 11 is a diagram for explaining a conventional defective product detection process;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... X-ray foreign material detection apparatus, 3 ... Conveyance part, 8 ... X-ray generator, 9 ... X-ray detection part, 13 ... Processing means, 16 ... Image processing part, 17 ... Missing part detection part, 17a ... Mask area | region setting , 17b... Inspection object extraction unit, 17c... Missing item determination unit, T... Container, M.

Claims (5)

The object to be inspected (W) accommodated in the container (T) is exposed to X-rays, and the object to be inspected is determined from the amount of X-ray transmitted through the object to be inspected as the X-rays are exposed. In the X-ray foreign matter detection device (1) for detecting the presence or absence of foreign matter in an object,
A mask area setting section (17a) for setting a mask area (M) for detecting a missing part of the inspection object having a predetermined range of a size smaller than the inspection object at a predetermined position inside the container;
An inspection object extraction unit (17b) that extracts an image area (A) of the inspection object from the developed image of the inspection object including the container based on the X-ray transmission amount;
A ratio of the image area of the inspection object extracted by the inspection object extraction unit included in the mask area set by the mask area setting unit is detected, and if the ratio exceeds a predetermined value set in the container, An out-of-stock determination unit (17c) that determines that an object to be inspected is stored and determines that the object to be inspected is a defective product that is not stored in the container when the ratio is lower than the predetermined value;
An X-ray foreign matter detection apparatus comprising: The mask area setting unit (17a) individually sets a mask area (M) for detecting a shortage for the plurality of objects (W) accommodated in the container (T),
The missing item determination unit (17c) detects the ratio of the image area of the inspection object extracted by the inspection object extraction unit included in the mask area for each mask area set by the mask area setting unit. If the ratio exceeds a predetermined value set in advance, it is determined that the object to be inspected is contained in the container. If the ratio is lower than the predetermined value, the object to be inspected is not contained in the container. The X-ray foreign matter detection device according to claim 1, wherein the X-ray foreign matter detection device is determined to be a good product . The mask area setting unit (17a) detects one end of the container (T) as a reference position (RF), and has a predetermined range at a predetermined position inside the container with the reference position as a reference, and an inspection object X-ray foreign material detecting apparatus according to any one of claims 1 or 2 to set the mask area for the shortage detection (M) of the. The missing item determination unit (17c) presets the area ratio (B) in the developed image as the ratio,
A value obtained by multiplying the total number of pixels (n) of the mask region (M) set by the mask region setting unit (17a) by the area ratio, and the inspection object extraction unit (17b) included in the mask region Is compared with the total number of pixels (CNT) of the image area (A) of the inspection object extracted, and if the total number of pixels of the inspection object is large, it is determined that the inspection object is accommodated in the container, The X-ray foreign matter detection device according to any one of claims 1 to 3, wherein the X-ray foreign object detection device determines that the defective product is not accommodated if there are few . The object to be inspected (W) accommodated in the container (T) is exposed to X-rays, and the object to be inspected is determined from the amount of X-ray transmitted through the object to be inspected as the X-rays are exposed. A defective product detection method that is applied to an X-ray foreign matter detection device (1) that detects the presence or absence of foreign matter in an object and detects the presence or absence of an object to be inspected in the container,
A mask area (M) for detecting a missing part of the inspection object having a predetermined range of a size smaller than the inspection object at a predetermined position inside the container,
Extracting the image area (A) of the inspection object from the developed image of the inspection object including the container based on the X-ray transmission amount,
A ratio of the image area of the inspection object extracted by the inspection object extraction unit included in the mask area set by the mask area setting unit is detected, and if the ratio exceeds a predetermined value set in the container, X-ray foreign object detection characterized in that it is determined that an object to be inspected is accommodated and if the ratio is lower than the predetermined value, it is determined that the object to be inspected is a defective product that is not accommodated in the container. Defective product detection method in an apparatus.

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