JPH09292351A - Radiographic examination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiographic examination device wherein defective and non-defective specimens can be accurately classified. SOLUTION: This radiographic examination irradiates a specimen 6 during carrying by a carrying means 3 with radiation from a radiation generating means 1 to detect penetrating radiation by a radiation detection means 2 to generate a radiation detection signal. The image of the specimen 6 is processed by an image processing means based on the radiation detection signal, and when a feature previously determined in the specimen is identified by a feature identification means, a removal signal generation means for generating a removal signal removing the specimen from the carrying means 3 is provided therewith. In this case, a removal position designation means for designating a position (removal position P) for removing the specimen is provided therewith, and when the feature identification means identifies the feature in the specimen, the removal signal is generated from a removal signal generation means when the specimen reaches the position designated by the removal position designation means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation inspection apparatus, and more particularly to a radiation inspection apparatus for nondestructively inspecting materials and products.

[0002]

2. Description of the Related Art FIG. 12 is a block diagram of a conventional radiation inspection apparatus for nondestructively inspecting articles such as materials and products.

As shown in FIG. 12, this radiation inspection apparatus conveys the articles (inspection articles, specimens) M101 to M104 placed on the belt conveyor 101 in the direction of the arrow Y, while the X-ray tube 102 receives the articles. The specimens M101 to M104 are sequentially irradiated with X-rays, the transmitted X-rays are received by the X-ray sensor 103, and after predetermined image processing, foreign matter FB101, FB inside the subject.
Detects 103.

When an object (defective product) containing foreign matter is detected, the defective product is pushed (excluded) to the outside of the belt conveyor 101 in the direction of arrow X by the removing means 104, and the object containing no foreign object is detected. Only good products are transferred to the next process.

Here, in the above-mentioned image processing, FIG.
As shown in FIG. 3 (A), the image (subject M101) photographed by the photographing means (X-ray tube 102, X-ray 103, etc.) is CR.
When it is located in the approximate center of the T screen 110, the quality of the subject can be accurately determined.

[0006]

However, during the image processing, the screen 11 as shown in FIG. 13 (B) is displayed.
When the position of the subject is offset within 0, the exclusion signal is output in screen units, so that the exclusion may fail (elimination error).

In the case shown in FIG. 13C, the arrow Y
When the foreign matter FB103 is detected in the leading object M103 being conveyed in the direction, the removing means 104 (see FIG. 12) removes the defective object M103 and the good object M104 from the belt conveyor 101 at the same time. There were times when it happened.

Furthermore, since the installation position of the excluding means 104 is fixed, the size, shape, and material of the subject (for example, those in which the X-ray fluoroscopic image of the contour of the subject is not formed) have changed. The response to the case was insufficient.

Therefore, an object of the present invention is to provide a radiation inspection apparatus capable of accurately sorting good products and defective products.

[0010]

In order to solve the above-mentioned problems, the invention according to claim 1 irradiates the subject being transported by the transport means with radiation from the radiation generation means and detects the transmitted radiation by the radiation detection means. Then, the radiation detection signal is generated, the image of the subject is processed by the image processing means based on the radiation detection signal, and the predetermined feature point in the subject is recognized by the feature point recognition means, In a radiation inspection apparatus including a removal signal generation unit that generates a removal signal for removing the subject from the transport unit, a removal position designating unit that designates a position where the subject is removed is provided, and the feature point recognition unit is provided. When a feature point is recognized in the object, a removal signal is generated from the removal signal generation means when the object reaches the position designated by the removal position designating means. And butterflies.

According to the invention described in claim 1, for example, FIG.
As shown in FIG.
Of these, a position (exclusion position) at which an article (defective product) having a characteristic point is removed is designated. When the feature point recognition means recognizes the feature point in the subject, the removal signal generation means generates a removal signal when the subject reaches the designated exclusion position. By doing so, only the article having the characteristic points can be reliably excluded at the specified exclusion position.

According to a second aspect of the present invention, the required transportation time from the position where the feature point recognition means is installed to the removal position designated by the removal position designation means is calculated, and the feature point recognition means When it is recognized, the removal signal is generated from the removal signal generation means when the calculated required transportation time has elapsed.

According to the second aspect of the present invention, the required transportation time from the position where the feature point recognition means is installed to the removal position designated by the removal position designation means is obtained. When the characteristic point recognizing means recognizes the characteristic point, the removal signal generating means generates the removal signal when the above-mentioned required transportation time has elapsed. By doing so, only the article having the characteristic points can be reliably excluded at the specified exclusion position.

According to a third aspect of the present invention, the object area recognition means for recognizing the object area in the image of the subject and the coordinates of the feature points in the object area recognized by the object area recognition means are determined. A characteristic point coordinate determining means, wherein when the object reaches the removal position designated by the removal position designating means, a signal of the coordinates determined by the feature point coordinate determining means is generated. To do.

According to the third aspect of the invention, the object area recognition means recognizes the object area in the image of the subject, and the feature point coordinate determination means recognizes the feature points in the object area recognized by the object area recognition means. Determine the coordinates of. When the object reaches the removal position designated by the removal position designating means, a signal of the coordinates determined by the feature point coordinate determining means is generated. As the coordinates, for example, coordinates in the traveling direction on the belt conveyor (X coordinates) and coordinates in the direction orthogonal to the belt conveyor (Y coordinates) can be defined.

According to a fourth aspect of the present invention, when a plurality of subjects are present in the processed image of the image processing means,
A first identical subject recognizing unit that recognizes the plurality of subjects as the same subject when the distance between the feature points is within a predetermined value is provided, and the first identical subject recognizing unit identifies the plurality of subjects as the same subject. The present invention is characterized in that a removal signal is generated when it is recognized as an object and the plurality of objects reach the removal position.

According to the fourth aspect of the present invention, the first identical subject recognizing means, when a plurality of subjects exist in the processed image, when the distances of the feature points are within a predetermined value, the plurality of subjects are detected. Recognize specimens as the same subject. The plurality of subjects are recognized as the same subject, and a removal signal is generated when the plurality of subjects reach the removal position. By doing so, for example, when the positions of two foreign matters are close to each other, as shown in FIG. 9,
It is possible to process two foreign substances as one, and work efficiency is improved.

According to a fifth aspect of the present invention, when a plurality of subjects exist in the processed image of the image processing means,
A second identical subject recognizing unit that recognizes the circumscribed shapes of the plurality of subjects as the same subject when the distance between the feature points is within a predetermined value, and the second identical subject recognizing unit includes the plurality of subject objects. It is characterized in that the specimens are recognized as the same specimen, and a removal signal is generated when the plurality of specimens reach the removal position.

According to the fifth aspect of the present invention, the second identical subject recognizing means, when a plurality of subjects exist in the processed image, when the distances of the feature points are within a predetermined value, the plurality of subjects are detected. The circumscribed shape of the sample is recognized as the same sample. The plurality of subjects are recognized as the same subject, and a removal signal is generated when the plurality of subjects reach the removal position. Also in this case, for example, 2
Individual foreign substances can be collectively processed, and work efficiency is improved.

Further, the invention according to claim 6 is provided with an image position designating means for designating another position in the image including the characteristic points, which position does not depend on the characteristic point position, and the position designated by the image position designating means is When the removal position is reached, the removal signal is generated from the removal signal generating means.

According to the sixth aspect of the invention, the image position designating means designates another position in the image containing the characteristic points, which position does not depend on the characteristic point position. When the other position reaches the removal position, the removal signal is generated from the removal signal generating means. For example, the removal signal is given to the foreign object position of the object shown in FIG. 5 based on the head position of the object. In this way, for example, the removing unit can obliquely dispose the guide bar 120 of the guide type removing unit shown in FIG. 12 on the belt conveyor 101 early to reliably remove the defective product.

According to a seventh aspect of the present invention, there is provided transport control means for controlling the transport of the transport means, and when the feature point recognizing means recognizes a feature point of the subject, the subject is removed at a removal position. The feature is that it is stopped at.

According to the invention described in claim 7, the transfer control means controls the transfer of the transfer means. When the feature point recognition unit recognizes the feature point of the subject, the subject is stopped at the removal position under the control of the transport control unit.

The invention according to claim 8 is characterized in that the subject is displayed when the subject is stopped at the removal position.

According to the invention described in claim 8, when the transport means is stopped by the control of the transport control means and the subject is stopped at the removal position, the subject is displayed.

Further, in the invention according to claim 9, when the subject spans a screen region for performing a plurality of image processing, the entire region of the subject is processed as one subject. It is characterized by

According to the invention described in claim 9, for example, FIG.
When the object M4 straddles the two screen areas I1 and I2, the entire area of the object M4 is processed as one object.

Further, the invention according to claim 10 is characterized in that, when the boundary of an object in the image processed by the image processing means cannot be recognized, the whole image is judged as the judgment area.

According to the tenth aspect of the invention, for example, as shown in FIG. 10, when the boundary of the object is unclear, the entire screen area is determined as the determination area.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. The same reference numerals are given to the parts already described, and duplicated description may be omitted.

(I) First Embodiment Example FIG. 1 is a block diagram of a radiation inspection apparatus RD of the present embodiment example. The radiation inspection apparatus RD is installed as a part of an apparatus that constitutes an "article manufacturing / inspection line" (not shown).

As shown in FIG. 1, below the X-ray tube 1 and the collimator 12, there is arranged a belt conveyor 3 on which a subject is placed and conveyed, and below the belt conveyor 3 is an X-ray sensor (line sensor). ) 2 is placed. With this configuration, the X-ray fluoroscopic image of the subject is obtained by the X-ray sensor 2 while moving the subject placed on the belt conveyor 3. In this embodiment, a line sensor is used as the X-ray sensor 2, but an area sensor may be used.

Further, 34 is an object detecting means composed of a photo switch for detecting the presence or absence of the subject on the belt conveyor 3, and 37 is an encoder for detecting the moving amount of the belt conveyor 3. 6 is a seismometer attached to the radiation inspection apparatus RD.

Then, the above-mentioned X-ray tube 1 and collimator 1
2, the seismograph 6a, the object detection means 34, the encoder 37, etc. are connected to the control device 5. The control device 5 is connected to a central control device 7 including a defect determining section 70, a feature point detecting means 75, etc., which will be described next.

That is, the central control unit 7 has the defect judging section 7
0, C for controlling each component in addition to the feature detection means 75
PU71, DAS that collects data and performs A / D conversion (DA
Interface 72 connected to TA ACQISITION SYSTEM) 21, IO 73 connected to the control device 5, image memory 74 for storing image data, I for outputting the determination result
O76, an article removal signal generator 77 that generates a removal signal for removing a defective product, and an abnormal portion removal signal that generates an abnormal portion removal signal for cutting and removing only an abnormal portion as described below. A generation unit 78, an abnormality processing unit 79 that gives an instruction to stop the system at the time of an earthquake or a system failure, and gives an instruction to remove the article due to inability to be determined, and an exclusion position that sets a position at which a defective product should be excluded from the belt conveyor 3 after the foreign substance inspection is performed. A setting unit 80, a conveyance control unit 81 that controls the conveyance speed of the belt conveyor 3, and an abnormality detection unit 82 that detects a system failure are provided.

As shown in FIG. 2, the defect determining section 70 includes an object area recognizing section 701 and an object current position recognizing section 7.
02, an object distance recognition unit 703 for recognizing a distance between objects
The same object recognition unit 704 that integrates a plurality of foreign substances or objects containing foreign substances into one area by one circumscribed rectangle, and recognizes whether or not the abnormal portions are the same by the distance between the abnormal portions or the distance between the centroids of the abnormal portions. The same abnormal part recognition unit 705, the inter-image connection recognition unit 707 of the object that recognizes whether or not the object straddles different image regions (described later), the current position of the abnormal part (distance from the X-ray data acquisition position) ) Is included in the abnormal position present position recognition unit 7021.

Further, as shown in FIG. 3A, the article removal signal generating section 77 has a position designating section 771 for designating a position in the scanning direction when the removal signal is generated, coordinates in the image of the abnormal portion ( (For example, the XY coordinates of the foreign matter position in FIG. 5, the Y coordinate in the scanning direction on the belt conveyor, and the X coordinate in the orthogonal direction)
A coordinate output unit 772 that outputs a screen position designation unit 7711 that designates positions within the screen, such as the beginning, middle, and end of the screen.
It has.

Further, the abnormal portion removal signal generation unit 78 has a position designation unit 781 for designating a position in the scanning direction when removing only the abnormal portion, a coordinate output unit 782 for outputting coordinates in the image of the abnormal portion, and a screen. A screen position designation unit 7811 for designating the position within the screen, such as the beginning, middle, and end of the screen, is provided.

Next, the operation of this embodiment will be described separately for (1) general description and (2) detailed operation.

(1) Schematic Operation In FIGS. 1 and 2, the X-ray detection signal (image data) of the X-ray sensor 2 is A / D converted by the DAS 21 and input to the central controller 7. In the image data temporarily stored in the image memory 74, the characteristic points described below are detected by the characteristic detecting means 75, and the defect determining section 70 excludes the peculiar structure of the object and performs the determination processing of the foreign matter or the defect. .

Specific examples of the specific structure of the object (object) include metal clips for packing meat ham, pull-top fittings for containers / canned foods, antioxidants for foods, bones in canned fish, etc. is there. In addition, characteristic points of the subject (for example, concentration,
Good / defective products are judged based on the area, geometric shape, topological characteristics, etc.). The determination result is output via IO76.

Based on this determination result, defective products are removed in the next step in the manufacturing / inspection line, or only defective portions (abnormal portions) are removed by cutting or the like.

(2) Detailed Operation First, referring to FIGS. 4 (A) and 4 (B), the X-ray tube 1, the X-ray sensor 2, the belt conveyor 3, the object 6 and the defective product removing device in the radiation inspection apparatus RD. The positional relationship of 105 and the like and the timing of generating a removal signal for removing defective products from the belt conveyor 3 will be described.

As shown in FIGS. 4A and 4B, the image data detected by the X-ray tube 1 and the X-ray sensor 2 is processed by the feature detecting means 75 or the like as described above, and the subject 6 is excluded. Position P
An exclusion signal (removal signal) that excludes defective products is output when the signal is reached. 9 is an X-ray shielding device.

In the figure, X is the X-ray data acquisition position, and F
Is a determination completion position for completing the determination of good or bad of the subject, and P is a removal position of the defective product. L is the distance from the X-ray data acquisition position X to the exclusion position P, and T is X.
This is the time required for the subject 6 to move from the line data collection position X to the exclusion position P. The distance L is the exclusion position setting unit 8
0 (see FIG. 1), the time T is the distance L
Is divided by the speed V of the belt conveyor 3 (T =
L / V).

The determination completion position F is determined from the time required from the completion of X-ray data collection to the completion of determination (note that
F is not a fixed position, and the processing content differs depending on the presence / absence of foreign matter and the processing time differs, so the position of F is different. A removal signal is output when the removal target (defective product) reaches the removal position P.

Next, the generation of the removal signal will be described based on the specific arrangement of the subject.

5 to 10 are timing diagrams.
These FIG. 5 to FIG. 10 are at the time when the image determination is completed (FIG.
3 is a view of the subject (object) 6 at the determination completion position F in FIG. 2 from above and shows the length in the traveling direction of the belt conveyor 3 in time units. In the figure, the upper part is X
The line data collection position X, and the defective product exclusion position P is below.
It is.

In addition to the concept of the screen 110 of the CRT described with reference to FIG. 13, the concept of “screen area I” shown in FIG. 11 is introduced in the following description.

In this screen area, the subjects M101 to M104 placed on the belt conveyor 3 are sequentially conveyed to the position of the photographing means (X-ray tube 1 and X-ray sensor 2) not shown. The region to be imaged by the imaging means is I1 for the first subject M101, and similarly I3 for the second subject M102, and the third and fourth regions. For the two subjects M103 and M104 of
5 These areas I1 to I5 are called "screen areas".

Since the above-mentioned photographing is continuously photographed at a constant interval regardless of the presence or absence of an object, the object may sometimes come to the joint of the screen area, the plural objects may enter the screen area, or the object may enter. Non-display screen areas I2 and I4 are also generated.

That is, an X-ray fluoroscopic image of the subject is displayed on the screen 110 as a unit (see FIGS. 13A to 13C). For example, the screen 110 in FIG. It is a screen of an X-ray fluoroscopic image corresponding to the screen region I1.

When there is one subject (object) in the screen area In FIG. 5, the elapsed time from the completion of X-ray data acquisition to the completion of determination (image processing completion) is t2, and the foreign matter in the screen area I It is assumed that the position of FB1 is t4 from the end of the screen and the head position of the object M1 containing the foreign substance FB1 is t1 from the end of the screen.

In this case, the difference from the time T from the X-ray data acquisition position X to the exclusion position P is [T
-T6 = p6], and [T-
t3 = p3]. If the removal signal is output when P3 has elapsed, the removal signal is output when the head of the object reaches the exclusion position P, and the object M1 is reliably removed.
Although it depends on the structure of the removing device (for example, the removing means 104 and 120 shown in FIG. 12), it is also possible to output the removal signal when P6 has passed, that is, when the foreign matter reaches the point P.

The region of the object M1 in the image can be recognized by binarizing the image at a density level higher than that of the background image, and the binarization process is performed in advance to obtain the object region.

The position designating unit 77 performs the position designation for issuing the rejection command signal (removal signal) for rejecting the object M1 including the foreign matter FB1 (for example, the rejection unit 104 shown in FIG. 12). Alternatively, it is possible to arbitrarily select the leading end, the center, the trailing end, etc. of the subject in accordance with the guide device 120 of the inductive type shown by the chain double-dashed line.

For example, in the case of the guide device 120 of the guiding type, it is necessary to set the guide member on the belt conveyor 3 in a slanting manner early. Therefore, if the head of the object M1 is designated and an exclusion command signal is issued, Since the object M1 can be smoothly guided to the guide member, and the piston type exclusion device 104 needs to push the object M1 to the side in a well-balanced manner, the center or the center of gravity of the object M1 is designated and an exclusion command signal is sent. You can give it.

The excluding mechanism 104 may be of the following mechanism other than the piston type and the guide type as described above. That is, there are a drop hole type mechanism called a damper, an air blowing mechanism, and a caterpillar function with a slide plate called a channelizer of Illumintronics.
When any of the above-mentioned mechanisms is adopted, the optimum position specification for exclusion is performed in advance for the adopted mechanism.

When necessary (for example, when cutting and removing only the part of the object where the foreign substance FB1 exists), the XY coordinates of the object M1 and the foreign substance FB1 itself are detected by the feature detecting means 75. Therefore, the coordinate output unit 77
It is also possible to output the XY coordinates by 2,782. The excluding device receives the output XY coordinate values and excludes this portion (for example, a cut portion).

When a plurality of subjects (objects) exist in the screen area FIG. 6 shows a case where a plurality of objects M2 and M3 exist in the same screen area I. At this time, the screen area I is divided into a left-side screen area IL and a right-side screen area IR along the object transport direction, and the objects M2 and M3 existing in the respective screen areas IL and IR are separately removed. Output a signal. For example, it is possible to output a foreign matter signal at a desired position, such as outputting a foreign matter signal at each position of the foreign matter FB2 and the foreign matter FB3 and outputting a foreign matter signal at the head position of the object.

It should be noted that t7 and t9 are elapsed times until the foreign matter FB2 and FB3 reach the current position (judgment completion position) from the X-ray data collection position X, and t8 and t10 are the head positions of the objects M2 and M3, respectively. The elapsed time from the X-ray data acquisition position X to the current position, p7 and p9 are the elapsed times from the current position of the foreign objects FB2 and FB3 to the exclusion position P, and p8 and p10 are the initial values of the objects M2 and M3, respectively. It is the elapsed time from the current position to the exclusion position P.

Case in which the subject extends over a plurality of screen areas FIG. 7 shows a case in which the object M4 extends over a plurality of screen areas I1 and I2. Both screen edges (tip I2F of screen area I2
And the presence or absence of the object M4 at the rear end portion I1E) of the screen area I1, and if the object M4 exists at both end portions I1E and I2F, it is determined that the object M4 straddles the adjacent screen areas I1 and I2. . This determination is performed by the inter-image connection recognition unit 707.

When the foreign matter FB4 is recognized in the previous screen area I1 (elapsed time t11 from the X-ray data acquisition position X),
It is also possible to output the removal signal at the head of the object M4 (elapsed time t12 from the X-ray data acquisition position X).

Further, in the next screen area I2 and thereafter, the foreign matter FB4
, The object M4 including the previous screen area I1 is recognized.
Arbitrary position designation is performed for the entire area of. When the designated position reaches the exclusion position P, a removal signal is output.

It should be noted that t11 is the elapsed time until the foreign matter FB4 reaches the current position (judgment completion) from the X-ray data acquisition position X, and t12 the head position of the object M4 reaches the current position from the X-ray data acquisition position X. Elapsed time from the current position of the foreign substance FB4 to the exclusion position P, p12
Is the elapsed time from the current position at the beginning of the object M4 to the exclusion position P.

When objects (objects) are randomly present in the screen area, a large number of objects M5 to M12 are randomly displayed in the screen area I in FIG.
Indicates the presence of.

The removal signal is output at the foreign object position or the object position.

In this way, a large number of objects M5 ...
Even if M12 is present, a removal signal can be output when an object M5 containing a foreign object reaches a point P from among many objects, so the number of objects excluded together with the object other than the object containing the foreign object can be determined. It can be kept to a minimum.

At t13, the beginning of the object in which the foreign substance FB5 exists is from the X-ray data acquisition position X to the current position (determination is completed).
P13 is the elapsed time from the current position of the foreign substance FB5 to the exclusion position P.

(II) Second Embodiment Example When the Distances between Objects are Close If the distances between objects or foreign objects are close, the operating speed of the excluding device may not be in time. In this way, when the distances between the objects are close to each other within a certain range, the approaching objects (for example, three approaching objects) are treated as the same object.

Whether or not the objects are close to each other is determined by the object distance recognition unit 703 (see FIG. 2) based on the closest distance between the objects in the screen area or the distance between the barycentric positions of the object image. It is also effective to judge the approach based only on the distance in the traveling direction of the object.

Whether or not the foreign matters are close to each other is determined by the same abnormality recognition unit 705 based on the closest approach distance between the foreign matters in the screen area or the distance between the barycentric positions of the foreign matters.

When it is determined that they are the same, the same object recognition unit (circumscribed rectangle) 704 is used to specify the position of the exclusion command signal for the foreign matter or the object containing the foreign matter, and the plurality of foreign matter or the circumscribed rectangle of the object area is defined as one area. It is effective to specify the position.

When the object is a continuous object FIG. 9 shows a case where a continuous object is an inspection object. In this case, the foreign matter position is determined, and the position designation unit 781 or the coordinate output unit 782 outputs the position in the scanning direction or the XY coordinates in the screen area.

It should be noted that t14 is the elapsed time until the central position of the two foreign substances reaches the current position (judgment completion position) from the X-ray data collection position X, and t14a and t14b are the foreign substances at the X-ray data collection position X, respectively. To the current position, p14a and p14b are the time from the current position of each foreign substance to the exclusion position P, and p14 is the time from the current position at the center of the two foreign substances to the exclusion position P. is there.

For example, when the density of the subject is low, the screen position designation unit 7 is used regardless of the density and shape of foreign matter or objects.
With 711 and 7811, it is possible to specify the position in the screen area such as the beginning, middle, and end of the screen (FIG. 10).
reference).

Particularly, if the density of the subject is low (for example,
It may be difficult to cut out only the area of the object from the image when the thickness is small (such as shavings and cone snacks). In that case, the entire screen area is set as a determination target, and when a foreign matter is recognized, a removal signal is output at the foreign matter position or the position of the screen area (for example, the center of the screen area, the head position of the screen area, or the like).

At t15, the foreign matter is at the X-ray data acquisition position X.
From the time when the current position of the foreign object is reached (judgment completed), t16 is the X-ray data acquisition position X when the center of the screen area is
Time elapsed from reaching the current position of the center from t17
Is the elapsed time until the tip of the screen area reaches the current position of the tip from the X-ray data acquisition position X, p15 and p16 are the elapsed time from the foreign object position and the current position of the screen area center to the exclusion position P, and p17 is the screen It is the elapsed time from the current position at the beginning of the area to the exclusion position P.

(III) Third Embodiment When a foreign object or an object containing a foreign object is determined, the object is stopped (that is, stopped so that the designated position of the object is at the exclusion position) when the removal signal is output. Foreign matter, or objects containing foreign matter, can be removed from it.

For example, when a person (worker) removes it, it is effective to display the target image. At that time,
When the determination result is displayed in the image, the removal work is easy. Further, when the image and the determination result are always displayed, the workability is further improved by maintaining the image display state of the removed portion.

Designation of stop position (designation of exclusion command signal position)
Is performed at the position of the object, the foreign substance, or the image. Between objects,
Or if the distance between foreign objects is within a certain range,
As described above, they can be processed as the same.

In each of the above embodiments, the case of excluding an object containing a foreign substance has been described, but the present invention is also applied to the case of excluding an object having a defect such as a cast "su" or a scratch on a plate material. it can.

[0083]

As described above, according to the invention described in each claim, the removal signal can be output in accordance with the part of the article (inspection object) such as the front end position and the rear end position of the article in the traveling direction. The removal signal can be output at the position of the foreign matter or defect in the article, and the output in accordance with the part of the article, the output at the location of the foreign matter or defect in the article, etc. can be obtained in the flow direction (X) of the article and the direction (Y) perpendicular thereto The removal signal can be output by the XY coordinates of the above, and the removal signal can be output as the same article for the ones in which the abnormal parts are close to each other. Further, when the abnormality is detected, the article is stopped at a fixed position. Therefore, the conveying means can be stopped and the image can be displayed. When the conveyor is stopped, the conveyor speed is abnormal, or the image cannot be processed, the system is stopped, and the articles present in the apparatus at that time cannot be inspected and excluded. it can.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a radiation inspection apparatus according to the present invention.

FIG. 2 is a block diagram of a defect determination unit that constitutes the embodiment.

FIG. 3 is a block diagram of a part constituting the embodiment, FIG. 3A is a block diagram of an article removal signal generator, and FIG. 3B is a block diagram of an abnormal portion removal signal generator.

4A and 4B are diagrams showing an X-ray data acquisition position, an exclusion position, and the like in the embodiment, FIG. 4A being a side view and FIG. 4B being a plan view.

FIG. 5 is a timing diagram when there is one object in the screen area in the embodiment.

FIG. 6 is a timing diagram when two objects are present in the screen area in the embodiment.

FIG. 7 is a timing diagram when an object straddles two screen areas in the embodiment.

FIG. 8 is a timing diagram in the case where objects randomly exist in one screen area in the embodiment example.

FIG. 9 is a timing diagram when a continuous (strip-shaped) object exists in the screen area in the embodiment.

FIG. 10 is a timing diagram in the case where an object whose boundary is unclear exists in the screen area in the embodiment.

FIG. 11 is a diagram illustrating a concept of a screen area in the embodiment.

FIG. 12 is a diagram illustrating a main part of a conventional radiation inspection apparatus.

FIG. 13 is a diagram for explaining the inconvenience of the conventional radiation inspection apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 X-ray tube 2 X-ray sensor 3 Belt conveyor 6 Object 7 Central control device 70 Defect determination unit 75 Feature detection means 77 Article removal signal generation unit 78 Abnormal part removal signal generation unit 79 Abnormal processing unit 80 Exclusion position setting unit 81 Transfer control Part 82 Abnormality detection part 110 Screen F Judgment position P Exclusion position X X-ray data collection position

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihiko Nishide 1st in Toshiba Fuchu, Tokyo Fuchu-shi, Toshiba Fuchu factory (72) Inventor Masafumi Motoyama 1st in Toshiba Fuchu, Tokyo Fuchu-shi, Ltd. (72) Inventor Masaya Yoshida 1 in Toshiba Fuchu factory, Fuchu-shi, Tokyo (72) Teruo Yamamoto 1 in Toshiba Fuchu factory, Fuchu-shi, Tokyo Inside Fuchu factory, Toshiba

Claims (10)

[Claims] 1. A radiation means irradiates a subject being transported by the transport means with radiation from the radiation generation means, the transmitted radiation is detected by the radiation detection means to generate a radiation detection signal, and the image processing means is based on the radiation detection signal. Process the image of the subject with
In a radiation inspection apparatus comprising a removal signal generating means for generating a removal signal for removing the subject from the transport means when the feature point recognition means recognizes a predetermined feature point in the subject, Equipped with a removal position designating means for designating a position for removing the subject, when the feature point recognizing means recognizes a feature point in the subject, the subject has reached the position designated by the removal position designating means. A radiation inspection apparatus, wherein a removal signal is generated from the removal signal generating means at times. 2. The required transportation time from the position where the feature point recognition means is installed to the removal position designated by the removal position designation means is obtained, and when the feature point recognition means recognizes the feature point, The radiation inspection apparatus according to claim 1, wherein the removal signal is generated from the removal signal generation means when the calculated required transportation time has elapsed. 3. An object area recognizing means for recognizing an object area in the image of the subject, and a characteristic point coordinate determining means for determining coordinates of the characteristic point in the object area recognized by the object area recognizing means. 3. The radiation according to claim 2, wherein when the object reaches the removal position designated by the removal position designation means, a signal of the coordinates determined by the feature point coordinate determination means is generated. Inspection device. 4. A first object for recognizing a plurality of subjects as the same subject when a distance between the feature points is within a predetermined value when there are a plurality of subjects in the processed image of the image processing means.
An identical object recognizing means, wherein the first identical object recognizing means recognizes the plurality of objects as the same object, and generates a removal signal when the plurality of objects reach a removal position. The radiation inspection apparatus according to claim 2, wherein 5. When a plurality of subjects exist in the processed image of the image processing means, the circumscribed shapes of the plurality of subjects are recognized as the same subject when the distance between the feature points is within a predetermined value. A second identical object recognizing means for recognizing the plurality of objects as the same object, and the second identical object recognizing means outputs a removal signal when the plurality of objects reach the removal position. The radiation inspection apparatus according to claim 2, wherein the radiation inspection apparatus is generated. 6. An image position designating means for designating another position which does not depend on the feature point position in the image including the feature point, and when the position designated by the image position designating means reaches a removal position, The radiation inspection apparatus according to claim 1, wherein a removal signal is generated from the removal signal generating means. 7. A transport control means for controlling the transport of the transport means is provided, and when the feature point recognition means recognizes a feature point of the subject, the subject is stopped at the removal position. The radiation inspection apparatus according to claim 1, which is characterized in that. 8. The radiation inspection apparatus according to claim 7, wherein the subject is displayed when the subject is stopped at the removal position. 9. The method according to claim 1, wherein when the subject extends over a screen area for performing a plurality of image processes, the entire area of the subject is processed as one subject. The radiation inspection apparatus according to claim 8. 10. The method according to claim 1, wherein when the boundary of an object in the image processed by the image processing means cannot be recognized, the entire image is determined as a determination area. The radiation inspection apparatus according to any one of claims.