JP4545637B2 - X-ray foreign object detection device - Google Patents

X-ray foreign object detection device Download PDF

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JP4545637B2
JP4545637B2 JP2005139689A JP2005139689A JP4545637B2 JP 4545637 B2 JP4545637 B2 JP 4545637B2 JP 2005139689 A JP2005139689 A JP 2005139689A JP 2005139689 A JP2005139689 A JP 2005139689A JP 4545637 B2 JP4545637 B2 JP 4545637B2
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正英 山崎
一毅 永塚
健史 山崎
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アンリツ産機システム株式会社
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Description

本発明は、被検査体を透過したＸ線量に基づいて生成されたＸ線画像を処理して被検査体に含まれる異物の有無を検出するＸ線異物検出装置に関するものである。   The present invention relates to an X-ray foreign object detection device that processes an X-ray image generated based on an X-ray dose that has passed through an object to be inspected to detect the presence or absence of foreign objects contained in the object to be inspected.

従来、Ｘ線異物検出装置として、１次元Ｘ線検出器からの各画素情報から、マスキング処理により検査不要領域の画素情報を除外したうえで異物の有無を判定するとともに、そのマスキング処理においては、背景部分を分離したのち画像の周囲から内側に向かって画素を除外すること、および、この除外の際に１次元Ｘ線検出器の検出素子の配列方向の除外画素数を、それと直交する方向の除外画素数よりも多く設定しているものが知られている（例えば特許文献１参照。）。   Conventionally, as an X-ray foreign matter detection apparatus, from the pixel information from the one-dimensional X-ray detector, the presence or absence of foreign matter is determined after excluding the pixel information of the inspection unnecessary region by masking processing. After separating the background portion, excluding pixels from the periphery to the inside of the image, and at the time of this exclusion, the number of excluded pixels in the arrangement direction of the detection elements of the one-dimensional X-ray detector There are known ones that are set to be larger than the number of excluded pixels (for example, see Patent Document 1).

特許第３５６７１２０号明細書（第３−４頁、第３図）Japanese Patent No. 3567120 (page 3-4, Fig. 3)

しかしながら、従来のＸ線異物検出装置においては、画像の周囲から内側に向かって画素を除外するときに予め設定された画素数に基づいて除外するので、被検査体が搬送されるときのＸ線源の光軸（Ｘ線の広がりの中心軸）に対する被検査体の通過位置によっては、マスキング処理が正しく行われないという問題があった。   However, in the conventional X-ray foreign object detection device, when pixels are excluded from the periphery to the inside of the image, they are excluded based on a preset number of pixels. There is a problem that the masking process is not performed correctly depending on the passing position of the object to be inspected with respect to the optical axis of the source (the central axis of the X-ray spread).

例えば、図２８に示すように円柱状の容器９８１と、容器９８１内に収納された内容物９８２とから構成された被検査体９８０が図２９に示すように搬送ベルト９９０上を搬送される場合、Ｘ線源９１１の光軸９１１Ａ上を被検査体９８０の中心軸９８０Ａが通過しないので、１次元Ｘ線検出器９１２からの各画素情報に基づいて被検査体９８０の輪郭形状が図３０（ａ）に示す画像９７１として得られる。画像９７１において、異物の検出が不要な領域である被検査体９８０の容器９８１の側壁部分９８１ａ（図２９参照。）の影は、本来、図３０（ｂ）にハッチングを付して示す領域９７１ａに対応する。しかしながら、上述した従来のＸ線異物検出装置においては、画像９７１の周囲から内側に向かって画素を除外するときに予め設定された画素数に基づいて除外するので、側壁部分９８１ａの影が例えば図３０（ｃ）にハッチングを付して示す領域９７１ｂとして誤って抽出される可能性があった。   For example, when an object to be inspected 980 composed of a cylindrical container 981 and a content 982 stored in the container 981 as shown in FIG. 28 is conveyed on the conveyor belt 990 as shown in FIG. Since the central axis 980A of the inspection object 980 does not pass on the optical axis 911A of the X-ray source 911, the contour shape of the inspection object 980 is based on the pixel information from the one-dimensional X-ray detector 912 as shown in FIG. It is obtained as an image 971 shown in a). In the image 971, the shadow of the side wall portion 981a (see FIG. 29) of the container 981 of the inspected object 980, which is an area where foreign object detection is unnecessary, is originally an area 971a indicated by hatching in FIG. Corresponding to However, in the above-described conventional X-ray foreign object detection device, when pixels are excluded from the periphery of the image 971 toward the inside, the pixels are excluded based on a preset number of pixels. There is a possibility that a region 971b indicated by hatching 30 (c) is erroneously extracted.

また、図２８に示すような円柱状の被検査体９８０が４つ合わさった図３１に示すような塊が図３２に示すように搬送ベルト９９０上を搬送される場合、１次元Ｘ線検出器９１２からの各画素情報に基づいて被検査体９８０の塊の輪郭形状が図３３（ａ）に示す画像９７１として得られる。画像９７１において、異物の検出が不要な領域である被検査体９８０の容器９８１の側壁部分９８１ａ（図３１参照。）の影は、本来、図３３（ｂ）にハッチングを付して示す領域９７１ａに対応する。しかしながら、上述した従来のＸ線異物検出装置においては、画像９７１の周囲から内側に向かって画素を除外するときに予め設定された画素数に基づいて除外するので、側壁部分９８１ａの影が例えば図３３（ｃ）にハッチングを付して示す領域９７１ｂとして誤って抽出される可能性があった。   Further, when a lump as shown in FIG. 31 in which four columnar inspected objects 980 as shown in FIG. 28 are combined is conveyed on the conveyor belt 990 as shown in FIG. 32, a one-dimensional X-ray detector is used. Based on the pixel information from 912, the outline shape of the mass of the inspected object 980 is obtained as an image 971 shown in FIG. In the image 971, the shadow of the side wall portion 981a (see FIG. 31) of the container 981 of the inspected object 980, which is an area where foreign object detection is unnecessary, is originally an area 971a indicated by hatching in FIG. Corresponding to However, in the above-described conventional X-ray foreign object detection device, when pixels are excluded from the periphery of the image 971 toward the inside, the pixels are excluded based on a preset number of pixels. 33 (c) may be erroneously extracted as a region 971b indicated by hatching.

本発明は、従来の問題を解決するためになされたもので、異物の検出が不要な領域を従来より適切に抽出することができ、異物の検出の信頼性を従来より向上することができるＸ線異物検出装置を提供することを目的とする。   The present invention has been made to solve the conventional problems, and can extract a region that does not require the detection of foreign matter more appropriately than before, and can improve the reliability of detection of foreign matter than before. An object of the present invention is to provide a linear foreign object detection device.

本発明のＸ線異物検出装置は、内容物（８２）が収納された複数の容器（８１）同士が接触して塊状にされて搬送される被検査体（８０）を透過したＸ線量に基づいて生成されたＸ線画像（３０）を処理して前記被検査体に含まれる異物の有無を検出するＸ線異物検出装置（１０）において、前記Ｘ線画像を所定の領域に分割するための第１分割閾値（４１）および第２分割閾値（４２）を設定する分割閾値設定手段（１３ａ）と、搬送される各被検査体に対応してそれぞれ生成された前記Ｘ線画像の画素の濃度分布及び前記分割閾値設定手段によって設定された前記第１分割閾値に基づいて前記Ｘ線画像を前記被検査体に対応すると想定される被検査体領域（３１）と該被検査体領域外の被検査体外領域（３２）とに分割し、分割された該被検査体領域について画素の濃度分布及び前記分割閾値設定手段によって設定された前記第２分割閾値に基づいて前記被検査体の前記容器の影響が強いと想定される容器影響候補領域（３３ａ）を分割し、該容器影響候補領域のうち前記被検査体領域の境界に接した領域を分割することにより前記複数の容器同士が接触する接触部分を含んでなる容器影響領域（３１ａ）とし該容器影響領域外を非容器影響領域（３１ｂ）として分割する領域分割手段（１３ｂ）と、前記非容器影響領域のみに対して前記異物の有無を判断する異物判断手段（１３ｃ）とを備えた構成を有している。 The X-ray foreign object detection device of the present invention is based on the X-ray dose transmitted through the object to be inspected (80) conveyed in a lump by bringing a plurality of containers (81) containing the contents (82) into contact with each other. In the X-ray foreign object detection device (10) for processing the X-ray image (30) generated in this way to detect the presence or absence of a foreign substance contained in the inspection object, the X-ray image is divided into predetermined areas. Division threshold value setting means (13a) for setting the first division threshold value (41) and the second division threshold value (42), and the density of the pixel of the X-ray image generated corresponding to each object to be conveyed Based on the distribution and the first division threshold set by the division threshold setting means, the X-ray image is assumed to correspond to the object to be inspected (31) and the object outside the object area. Divided into a region outside the body to be inspected (32) and the divided Container Effect candidate region in which the influence of the container of the device under test is considered to be stronger on the basis of the second dividing threshold set for the inspected area by the density distribution and the dividing threshold setting means pixels (33a) The container influence region (31a) including a contact portion where the plurality of containers come into contact with each other by dividing the region that touches the boundary of the inspected object region among the container influence candidate regions. It has a configuration comprising an area dividing means (13b) for dividing the outside of the area as a non-container influence area (31b), and a foreign substance determination means (13c) for judging the presence or absence of the foreign substance only in the non-container influence area. is doing.

この構成により、本発明のＸ線異物検出装置は、被検査体領域を、画素の濃度分布及び第２分割閾値に基づいて被検査体のＸ線画像のうち被検査体中の容器の影響が強いと想定される容器影響候補領域として分割し、容器影響候補領域のうち被検査体領域の境界に接した領域を分割することにより複数の容器同士が接触する接触部分を含んでなる容器影響領域とし容器影響領域外を非容器影響領域として分割するので、異物の検出が不要な領域である容器影響領域を従来より適切に抽出することができ、異物の検出の信頼性を従来より向上することができる。即ち、本発明のＸ線異物検出装置は、被検査体のＸ線画像から異物の検出が必要な領域を従来より適切に抽出することができ、異物の検出の信頼性を従来より向上することができる。 With this configuration, the X-ray foreign object detection device according to the present invention is configured so that the inspected object region is affected by the container in the inspected object in the X-ray image of the inspected object based on the pixel density distribution and the second division threshold. A container influence region including a contact portion where a plurality of containers contact each other by dividing a region that is in contact with the boundary of the inspected region by dividing the container influence candidate region that is assumed to be strong. Since the outside of the container influence area is divided as the non-container influence area, the container influence area, which is an area where foreign object detection is unnecessary, can be extracted more appropriately than before, and the reliability of foreign object detection can be improved. Can do. In other words, the X-ray foreign object detection apparatus of the present invention can more appropriately extract a region where foreign object detection is required from the X-ray image of the object to be inspected, and improve the reliability of foreign object detection compared to the past. Can do.

さらに、本発明のＸ線異物検出装置は、被検査体のＸ線画像のうち実際には異物に対応する領域が誤って容器影響領域に含まれる可能性を低減することができる。 Furthermore, the X-ray foreign object detection device of the present invention can reduce the possibility that an area corresponding to a foreign substance in the X-ray image of the object to be inspected is erroneously included in the container influence area.

また、本発明のＸ線異物検出装置は、画像を表示する表示手段と、前記容器影響領域及び前記非容器影響領域の少なくとも一方を前記Ｘ線画像に重ねて前記表示手段に表示させる表示制御手段とを備え、前記分割閾値設定手段は、利用者によって指定された前記分割閾値を設定する構成を有している。   In addition, the X-ray foreign object detection apparatus of the present invention includes a display unit that displays an image, and a display control unit that causes the display unit to display at least one of the container-affected area and the non-container-affected area on the X-ray image. The division threshold setting means sets the division threshold specified by the user.

この構成により、本発明のＸ線異物検出装置は、分割閾値によって分割された容器影響領域及び非容器影響領域の少なくとも一方を利用者に見させながら利用者に分割閾値を指定させることができるので、利用者に分割閾値を容易に設定させることができる。   With this configuration, the X-ray foreign object detection device of the present invention can allow the user to specify the division threshold while allowing the user to see at least one of the container influence area and the non-container influence area divided by the division threshold. The user can easily set the division threshold.

また、本発明のＸ線異物検出装置は、画像を表示する表示手段と、前記非容器影響領域の前記Ｘ線画像における前記被検査体の搬送方向上の位置が等しい画素のうち濃度が最大の画素の濃度を前記位置毎に表したグラフを前記表示手段に表示させる表示制御手段とを備えた構成を有している。   Further, the X-ray foreign matter detection apparatus of the present invention has the highest density among the display means for displaying an image and the pixels in the X-ray image of the non-container-affected region in the X-ray image having the same position in the transport direction. And a display control unit that causes the display unit to display a graph representing the density of the pixel for each position.

この構成により、本発明のＸ線異物検出装置は、非容器影響領域のＸ線画像に対して異物の有無を判断するための閾値を利用者に容易に設定させることができる。   With this configuration, the X-ray foreign object detection device of the present invention can allow the user to easily set a threshold value for determining the presence or absence of foreign objects in the X-ray image of the non-container affected area.

本発明は、異物の検出が不要な領域を従来より適切に抽出することができ、異物の検出の信頼性を従来より向上することができるＸ線異物検出装置を提供することができるものである。   The present invention can provide an X-ray foreign object detection device that can appropriately extract a region that does not require detection of foreign objects and can improve the reliability of detection of foreign objects. .

更に、本発明のＸ線異物検出装置は、被検査体のＸ線画像のうち実際には異物に対応する領域が誤って容器影響領域に含まれる可能性を低減することができる。   Furthermore, the X-ray foreign object detection device of the present invention can reduce the possibility that an area corresponding to a foreign substance in the X-ray image of the inspection object is erroneously included in the container influence area.

更に、本発明のＸ線異物検出装置は、分割閾値によって分割された容器影響領域及び非容器影響領域の少なくとも一方を利用者に見させながら利用者に分割閾値を指定させることができるので、利用者に分割閾値を容易に設定させることができる。   Furthermore, the X-ray foreign object detection device of the present invention can allow the user to specify the division threshold while allowing the user to see at least one of the container influence area and the non-container influence area divided by the division threshold. The person can easily set the division threshold.

更に、本発明のＸ線異物検出装置は、非容器影響領域のＸ線画像に対して異物の有無を判断するための閾値を利用者に容易に設定させることができる。   Furthermore, the X-ray foreign object detection device of the present invention can allow the user to easily set a threshold value for determining the presence or absence of a foreign object in the X-ray image of the non-container affected area.

以下、本発明の実施の形態について、図面を用いて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

（第１の実施の形態）
まず、第１の実施の形態に係るＸ線異物検出装置の構成について説明する。 (First embodiment)
First, the configuration of the X-ray foreign object detection device according to the first embodiment will be described.

図１及び図２に示すように、本実施の形態に係るＸ線異物検出装置１０は、搬送ベルト９０によって搬送される被検査体８０にＸ線１１ａを照射するＸ線源１１と、Ｘ線源１１によって照射されたＸ線１１ａを検出する検出素子が搬送ベルト９０による被検査体８０の搬送方向とは直交する方向に配列されたＸ線検出器１２と、Ｘ線検出器１２の検出結果に基づいてＸ線画像３０（図３参照。）を生成し、生成したＸ線画像３０を処理して被検査体８０に含まれる異物の有無を判断するコンピュータ１３と、コンピュータ１３による異物の判断結果等を表示する表示手段としてのディスプレイ１４と、ディスプレイ１４の画面に重ねて配置されて利用者の操作に応じた信号をコンピュータ１３に入力するタッチパネル１５とを備えている。   As shown in FIGS. 1 and 2, the X-ray foreign object detection apparatus 10 according to the present embodiment includes an X-ray source 11 that irradiates an X-ray 11 a to an inspection object 80 conveyed by a conveyance belt 90, and an X-ray. An X-ray detector 12 in which detection elements for detecting X-rays 11 a irradiated by the source 11 are arranged in a direction orthogonal to the conveyance direction of the object 80 to be inspected by the conveyance belt 90, and the detection result of the X-ray detector 12 A computer 13 that generates an X-ray image 30 (see FIG. 3) based on the image, processes the generated X-ray image 30 to determine the presence / absence of a foreign object contained in the inspected object 80, and determines the foreign object by the computer 13. A display 14 is provided as a display means for displaying results and the like, and a touch panel 15 is provided so as to overlap the screen of the display 14 and input a signal according to a user operation to the computer 13.

コンピュータ１３は、プログラムが記録された図示していないＲＯＭ（Ｒｅａｄ Ｏｎｌｙ Ｍｅｍｏｒｙ）、ＲＯＭに記録されたプログラムに基づいて動作する図示していないＣＰＵ（Ｃｅｎｔｒａｌ Ｐｒｏｃｅｓｓｉｎｇ Ｕｎｉｔ）、ＣＰＵの作業領域である図示していないＲＡＭ（Ｒａｎｄｏｍ Ａｃｃｅｓｓ Ｍｅｍｏｒｙ）等を含んで構成されている。   The computer 13 is a ROM (Read Only Memory) (not shown) in which a program is recorded, a CPU (Central Processing Unit) (not shown) that operates based on the program recorded in the ROM, and a work area of the CPU. RAM (Random Access Memory) and the like are included.

本実施の形態に係る被検査体８０は、容器８１と、容器８１内に収納された内容物８２とから構成されている。なお、図２に示す容器８１の形状は、図４に示すように円柱状である。   The inspected object 80 according to the present embodiment includes a container 81 and a content 82 stored in the container 81. The shape of the container 81 shown in FIG. 2 is a columnar shape as shown in FIG.

次に、Ｘ線異物検出装置１０の動作について説明する。   Next, the operation of the X-ray foreign object detection device 10 will be described.

まず、Ｘ線画像３０中の被検査体８０に対応すると想定される被検査体領域３１（図５参照。）と被検査体領域３１以外の被検査体外領域３２とを分割するための閾値である第１分割閾値４１（図６参照。）と、被検査体領域３１のうち被検査体８０中の容器８１の影響が強いと想定される容器影響領域３１ａ（図７参照。）と容器影響領域３１ａ以外の非容器影響領域３１ｂ（図７参照。）とを分割するための閾値である第２分割閾値４２（図６参照。）とを設定する動作について説明する。   First, the threshold value for dividing the inspection object region 31 (see FIG. 5) assumed to correspond to the inspection object 80 in the X-ray image 30 and the inspection object outside region 32 other than the inspection object region 31. A certain first division threshold value 41 (see FIG. 6), a container influence region 31a (see FIG. 7) that is assumed to have a strong influence of the container 81 in the inspection object 80 in the inspection object region 31, and the container influence. An operation for setting the second division threshold 42 (see FIG. 6), which is a threshold for dividing the non-container influence region 31b (see FIG. 7) other than the region 31a, will be described.

第１分割閾値４１及び第２分割閾値４２の設定用の被検査体８０が搬送ベルト９０によって搬送されると、Ｘ線源１１によって被検査体８０にＸ線１１ａが照射され、Ｘ線検出器１２の検出結果がコンピュータ１３に入力される。   When the inspection object 80 for setting the first division threshold value 41 and the second division threshold value 42 is conveyed by the conveyance belt 90, the X-ray source 11 irradiates the inspection object 80 with the X-ray 11a, and the X-ray detector. Twelve detection results are input to the computer 13.

コンピュータ１３は、Ｘ線検出器１２の検出結果が入力されると、図８に示す処理を開始する。なお、第１分割閾値４１及び第２分割閾値４２は、Ｘ線検出器１２の検出結果が７ビット（１２８階調）の場合、図８に示す処理の開始前に初期値として例えば予め“１００”に設定されている。   When the detection result of the X-ray detector 12 is input, the computer 13 starts the process shown in FIG. Note that the first division threshold 41 and the second division threshold 42 are, for example, “100” as initial values before the start of the processing shown in FIG. 8 when the detection result of the X-ray detector 12 is 7 bits (128 gradations). "Is set.

即ち、コンピュータ１３は、Ｘ線検出器１２の検出結果に基づいてＸ線画像３０を生成し（Ｓ１０１）、生成したＸ線画像３０を図３に示すようにディスプレイ１４のＸ線画像表示領域１４ａに表示させる（Ｓ１０２）。   That is, the computer 13 generates an X-ray image 30 based on the detection result of the X-ray detector 12 (S101), and the generated X-ray image 30 is displayed on the X-ray image display area 14a of the display 14 as shown in FIG. (S102).

次いで、コンピュータ１３は、Ｘ線画像３０のうち現在の第１分割閾値４１以上の濃度である画素の領域を被検査体領域３１とし、Ｘ線画像３０のうち被検査体領域３１以外の領域を被検査体外領域３２として分割し（Ｓ１０３）、分割した被検査体領域３１のうち現在の第２分割閾値４２以上の濃度である画素の領域を容器影響領域３１ａとし、被検査体領域３１のうち容器影響領域３１ａ以外の領域を非容器影響領域３１ｂとして分割する（Ｓ１０４）。   Next, the computer 13 sets an area of a pixel having a density equal to or higher than the current first division threshold 41 in the X-ray image 30 as an inspection object area 31, and sets an area other than the inspection object area 31 in the X-ray image 30. The region outside the inspection object region 32 is divided (S103), and the region of the pixel having a density equal to or higher than the current second division threshold value 42 in the divided inspection object region 31 is defined as the container influence region 31a. An area other than the container influence area 31a is divided as a non-container influence area 31b (S104).

そして、コンピュータ１３は、現在の容器影響領域３１ａ、第１分割閾値４１及び第２分割閾値４２を図９に示すようにディスプレイ１４のＸ線画像表示領域１４ａに表示させる（Ｓ１０５）。即ち、コンピュータ１３は、現在の容器影響領域３１ａをＸ線画像３０に重ねてディスプレイ１４のＸ線画像表示領域１４ａに表示させるとともに、ディスプレイ１４の第１分割閾値４１用の分割閾値表示領域１４ｂに現在の第１分割閾値４１を表示させ、ディスプレイ１４の第２分割閾値４２用の分割閾値表示領域１４ｃに現在の第２分割閾値４２を表示させる。   Then, the computer 13 displays the current container influence area 31a, the first division threshold 41, and the second division threshold 42 on the X-ray image display area 14a of the display 14 as shown in FIG. 9 (S105). That is, the computer 13 superimposes the current container influence area 31a on the X-ray image 30 and displays it on the X-ray image display area 14a of the display 14 and also displays it on the division threshold display area 14b for the first division threshold 41 of the display 14. The current first division threshold value 41 is displayed, and the current second division threshold value 42 is displayed in the division threshold value display area 14 c for the second division threshold value 42 of the display 14.

次いで、コンピュータ１３は、タッチパネル１５のうちディスプレイ１４の第１分割閾値４１用の分割閾値調整領域１４ｄ、１４ｅ（図９参照。）に対応する部分が利用者によって触れられたか否かを判断する（Ｓ１０６）。   Next, the computer 13 determines whether or not a portion of the touch panel 15 corresponding to the divided threshold adjustment areas 14d and 14e (see FIG. 9) for the first divided threshold 41 of the display 14 has been touched by the user (see FIG. 9). S106).

そして、コンピュータ１３は、タッチパネル１５のうち分割閾値調整領域１４ｄ、１４ｅに対応する部分が所定時間内に利用者によって触れられたとＳ１０６において判断すると、第１分割閾値４１を再設定して（Ｓ１０７）、Ｓ１０３の処理に戻る。即ち、コンピュータ１３は、タッチパネル１５のうち分割閾値調整領域１４ｄに対応する部分が利用者によって触れられたときには第１分割閾値４１を１つ減算した値に再設定し、タッチパネル１５のうち分割閾値調整領域１４ｅに対応する部分が利用者によって触れられたときには第１分割閾値４１を１つ加算した値に再設定して、Ｓ１０３の処理に戻る。   When the computer 13 determines in S106 that the portion of the touch panel 15 corresponding to the divided threshold adjustment areas 14d and 14e has been touched by the user within a predetermined time, the computer 13 resets the first divided threshold 41 (S107). , The process returns to S103. That is, when the part of the touch panel 15 corresponding to the division threshold adjustment area 14d is touched by the user, the computer 13 resets the first division threshold 41 to a value obtained by subtracting one, and the division threshold adjustment of the touch panel 15 is adjusted. When the part corresponding to the area 14e is touched by the user, the first division threshold 41 is reset to a value obtained by adding one, and the process returns to S103.

一方、コンピュータ１３は、タッチパネル１５のうち分割閾値調整領域１４ｄ、１４ｅに対応する部分が利用者によって触れられなかったとＳ１０６において判断すると、タッチパネル１５のうちディスプレイ１４の第２分割閾値４２用の分割閾値調整領域１４ｆ、１４ｇ（図９参照。）に対応する部分が利用者によって触れられたか否かを判断する（Ｓ１０８）。   On the other hand, when the computer 13 determines in S106 that the part corresponding to the division threshold adjustment areas 14d and 14e in the touch panel 15 has not been touched by the user, the division threshold for the second division threshold 42 of the display 14 in the touch panel 15 is obtained. It is determined whether or not portions corresponding to the adjustment areas 14f and 14g (see FIG. 9) have been touched by the user (S108).

そして、コンピュータ１３は、タッチパネル１５のうち分割閾値調整領域１４ｆ、１４ｇに対応する部分が所定時間内に利用者によって触れられたとＳ１０８において判断すると、第２分割閾値４２を再設定して（Ｓ１０９）、Ｓ１０４の処理に戻る。即ち、コンピュータ１３は、タッチパネル１５のうち分割閾値調整領域１４ｆに対応する部分が利用者によって触れられたときには第２分割閾値４２を１つ減算した値に再設定し、タッチパネル１５のうち分割閾値調整領域１４ｇに対応する部分が利用者によって触れられたときには第２分割閾値４２を１つ加算した値に再設定して、Ｓ１０４の処理に戻る。   When the computer 13 determines in S108 that the portion of the touch panel 15 corresponding to the divided threshold adjustment areas 14f and 14g has been touched by the user within a predetermined time, the computer 13 resets the second divided threshold 42 (S109). , The process returns to S104. That is, when the part of the touch panel 15 corresponding to the division threshold adjustment area 14 f is touched by the user, the computer 13 resets the second division threshold 42 to a value obtained by subtracting one, and adjusts the division threshold adjustment of the touch panel 15. When the part corresponding to the region 14g is touched by the user, the second division threshold value 42 is reset to a value obtained by adding one, and the process returns to S104.

一方、コンピュータ１３は、タッチパネル１５のうち分割閾値調整領域１４ｆ、１４ｇに対応する部分が利用者によって触れられなかったとＳ１０８において判断すると、所定時間が経過したか否かを判断する（Ｓ１１０）。   On the other hand, when the computer 13 determines in S108 that the portion of the touch panel 15 corresponding to the divided threshold adjustment areas 14f and 14g has not been touched by the user, the computer 13 determines whether or not a predetermined time has passed (S110).

そして、コンピュータ１３は、所定時間が経過していないとＳ１１０において判断するとＳ１０６の処理に戻り、所定時間が経過したとＳ１１０において判断すると図８に示す一連の処理を終了する。   When the computer 13 determines in S110 that the predetermined time has not elapsed, the process returns to S106. When the computer 13 determines in S110 that the predetermined time has elapsed, the series of processes illustrated in FIG.

次に、被検査体８０に含まれる異物の有無を検出する動作について説明する。   Next, an operation for detecting the presence / absence of a foreign substance contained in the inspection object 80 will be described.

異物の検出用の被検査体８０が搬送ベルト９０によって搬送されると、Ｘ線源１１によって被検査体８０にＸ線１１ａが照射され、Ｘ線検出器１２の検出結果がコンピュータ１３に入力される。   When the inspection object 80 for detecting foreign matter is conveyed by the conveyance belt 90, the X-ray source 11 irradiates the inspection object 80 with the X-ray 11a, and the detection result of the X-ray detector 12 is input to the computer 13. The

コンピュータ１３は、Ｘ線検出器１２の検出結果が入力されると、図１０に示す処理を開始する。   When the detection result of the X-ray detector 12 is input, the computer 13 starts the process shown in FIG.

即ち、コンピュータ１３は、Ｘ線検出器１２の検出結果に基づいてＸ線画像３０を生成し（Ｓ１２１）、生成したＸ線画像３０のうち図８に示す処理によって予め設定されていた第１分割閾値４１以上の濃度である画素の領域を被検査体領域３１とし、Ｘ線画像３０のうち被検査体領域３１以外の領域を被検査体外領域３２として分割し（Ｓ１２２）、分割した被検査体領域３１のうち図８に示す処理によって予め設定されていた第２分割閾値４２以上の濃度である画素の領域を容器影響領域３１ａとし、被検査体領域３１のうち容器影響領域３１ａ以外の領域を非容器影響領域３１ｂとして分割する（Ｓ１２３）。   That is, the computer 13 generates an X-ray image 30 based on the detection result of the X-ray detector 12 (S121), and the first division set in advance by the processing shown in FIG. 8 in the generated X-ray image 30. A region of a pixel having a density equal to or higher than the threshold 41 is set as an inspection object region 31, and an area other than the inspection object region 31 in the X-ray image 30 is divided as an inspection object outside region 32 (S122). A region of a pixel having a density equal to or higher than the second division threshold value 42 set in advance by the processing shown in FIG. 8 in the region 31 is defined as a container affected region 31a, and a region other than the container affected region 31a in the inspected region 31 is defined. The non-container influence area 31b is divided (S123).

次いで、コンピュータ１３は、Ｓ１２３において分割した非容器影響領域３１ｂのＸ線画像３０に対して画素の濃度と、所定の異物検出閾値５１（図１１参照。）とに基づいて異物の有無を判断し（Ｓ１２４）、Ｓ１２４における判断の結果をディスプレイ１４に表示して（Ｓ１２５）、図１０に示す一連の処理を終了する。   Next, the computer 13 determines the presence or absence of foreign matter based on the pixel density and the predetermined foreign matter detection threshold value 51 (see FIG. 11) for the X-ray image 30 of the non-container affected region 31b divided in S123. (S124) The result of determination in S124 is displayed on the display 14 (S125), and the series of processing shown in FIG.

コンピュータ１３は、異物の検出用の新たな被検査体８０が搬送ベルト９０によって搬送される度に、図１０に示す一連の処理を行う。   The computer 13 performs a series of processes shown in FIG. 10 each time a new inspection object 80 for detecting a foreign object is conveyed by the conveyance belt 90.

なお、図１０に示すＳ１２３において分割される容器影響領域３１ａ及び非容器影響領域３１ｂは、例えば被検査体８０の容器８１の形状が図４に示すように円柱状である場合に第１分割閾値４１及び第２分割閾値４２の設定用の被検査体８０に対して図８に示す処理によって適切な第１分割閾値４１及び第２分割閾値４２が設定されているとき、異物の検出用の被検査体８０がＸ線源１１及びＸ線検出器１２の間を図２に示すように通過した場合に図７に示すようになり、異物の検出用の被検査体８０がＸ線源１１及びＸ線検出器１２の間を図１２に示すように通過した場合に図１３に示すようになる。   Note that the container influence area 31a and the non-container influence area 31b divided in S123 shown in FIG. 10 are, for example, the first division threshold when the shape of the container 81 of the object 80 is cylindrical as shown in FIG. When the appropriate first division threshold 41 and second division threshold 42 are set by the processing shown in FIG. 8 for the inspected object 80 for setting 41 and the second division threshold 42, the object for detecting foreign matter is set. When the inspection object 80 passes between the X-ray source 11 and the X-ray detector 12 as shown in FIG. 2, it becomes as shown in FIG. When passing between the X-ray detectors 12 as shown in FIG. 12, it becomes as shown in FIG.

また、図１０に示すＳ１２３において分割される容器影響領域３１ａ及び非容器影響領域３１ｂは、例えば被検査体８０の容器８１の形状が図４に示すように円柱状であって４つの被検査体８０が図１４に示すように一塊にされている場合に第１分割閾値４１及び第２分割閾値４２の設定用の４つの被検査体８０の塊に対して図８に示す処理によって適切な第１分割閾値４１及び第２分割閾値４２が設定されているとき、異物の検出用の４つの被検査体８０の塊がＸ線源１１及びＸ線検出器１２の間を図１５に示すように通過した場合に図１６に示すようになる。   Further, the container influence area 31a and the non-container influence area 31b divided in S123 shown in FIG. 10 are, for example, a cylindrical shape as shown in FIG. When 80 is made into one lump as shown in FIG. 14, the process shown in FIG. 8 can be applied to the lump of four inspected objects 80 for setting the first division threshold 41 and the second division threshold 42. When the 1-division threshold value 41 and the second-division threshold value 42 are set, as shown in FIG. 15, the lump of the four inspected objects 80 for detecting foreign matter is between the X-ray source 11 and the X-ray detector 12. When it passes, it becomes as shown in FIG.

また、図１０に示すＳ１２３において分割される容器影響領域３１ａ及び非容器影響領域３１ｂは、例えば被検査体８０の容器８１の形状が図１７に示す形状であって４つの被検査体８０が図１８に示すように一塊にされている場合に第１分割閾値４１及び第２分割閾値４２の設定用の４つの被検査体８０の塊に対して図８に示す処理によって適切な第１分割閾値４１及び第２分割閾値４２が設定されているとき、異物の検出用の４つの被検査体８０の塊がＸ線源１１及びＸ線検出器１２の間を図１９に示すように通過した場合に図２０に示すようになる。なお、図１７に示す被検査体８０には容器８１の外部に凹部８１ａが存在するが、４つの被検査体８０の塊の製造方法によっては、４つの被検査体８０が図１８に示すように一塊にされたときに被検査体８０同士の接触部分にある凹部８１ａには異物が存在する可能性が低い場合がある。コンピュータ１３は、異物の検出用の４つの被検査体８０の塊のうち被検査体８０同士の接触部分にある凹部８１ａに対応するＸ線画像３０の領域を図２０に示すように容器影響領域３１ａとすることができるので、異物の検出用の４つの被検査体８０の塊のうち被検査体８０同士の接触部分にある凹部８１ａに対して異物の有無の検出を行わないようにすることができる。   In addition, the container influence area 31a and the non-container influence area 31b divided in S123 shown in FIG. 10 have, for example, the shape of the container 81 of the inspected object 80 shown in FIG. As shown in FIG. 18, an appropriate first division threshold value is obtained by the processing shown in FIG. 8 for the four pieces of the inspected object 80 for setting the first division threshold value 41 and the second division threshold value 42 when they are made into one piece. When 41 and the second division threshold 42 are set, a lump of four inspected objects 80 for detecting foreign matter passes between the X-ray source 11 and the X-ray detector 12 as shown in FIG. As shown in FIG. In addition, although the to-be-inspected object 80 shown in FIG. 17 has the recessed part 81a outside the container 81, depending on the manufacturing method of the lump of the four to-be-inspected objects 80, as shown in FIG. In some cases, there is a low possibility that foreign matter is present in the concave portion 81a at the contact portion between the inspected objects 80 when they are made into one lump. The computer 13 determines the region of the X-ray image 30 corresponding to the concave portion 81a in the contact portion between the inspected bodies 80 among the four inspected bodies 80 for detecting foreign matter as shown in FIG. 31a, so that the presence or absence of foreign matter is not detected in the concave portion 81a at the contact portion between the inspected bodies 80 among the four inspected bodies 80 for detecting foreign matter. Can do.

また、図１０に示すＳ１２３において分割される容器影響領域３１ａ及び非容器影響領域３１ｂは、例えば被検査体８０の容器８１の形状が図２１に示す形状である場合に第１分割閾値４１及び第２分割閾値４２の設定用の被検査体８０に対して図８に示す処理によって適切な第１分割閾値４１及び第２分割閾値４２が設定されているとき、異物の検出用の被検査体８０がＸ線源１１及びＸ線検出器１２の間を図２２に示すように通過した場合に図２３に示すようになる。   Further, the container influence area 31a and the non-container influence area 31b divided in S123 shown in FIG. 10 are, for example, when the shape of the container 81 of the object 80 is the shape shown in FIG. When an appropriate first division threshold 41 and second division threshold 42 are set by the process shown in FIG. 8 for the inspected object 80 for setting the two-divided threshold 42, the inspected object 80 for detecting foreign matter is used. When passing between the X-ray source 11 and the X-ray detector 12 as shown in FIG. 22, it becomes as shown in FIG.

以上に説明したように、コンピュータ１３は、図８に示すＳ１０９において容器影響領域３１ａ及び非容器影響領域３１ｂを分割するための第２分割閾値４２を設定するようになっており、分割閾値設定手段（１３ａ）を構成している。また、コンピュータ１３は、図８に示すＳ１０４や図１０に示すＳ１２３において画素の濃度分布と、第２分割閾値４２とに基づいて容器影響領域３１ａ及び非容器影響領域３１ｂを分割するようになっており、領域分割手段（１３ｂ）を構成している。また、コンピュータ１３は、図１０に示すＳ１２４において非容器影響領域３１ｂのＸ線画像３０に対して異物の有無を判断するようになっており、異物判断手段（１３ｃ）を構成している。したがって、Ｘ線異物検出装置１０は、容器影響領域３１ａ及び非容器影響領域３１ｂを画素の濃度分布及び第２分割閾値４２に基づいて分割するので、異物の検出が不要な領域である容器影響領域３１ａを従来より適切に抽出することができ、異物の検出の信頼性を従来より向上することができる。即ち、Ｘ線異物検出装置１０は、被検査体８０のＸ線画像３０から異物の検出が必要な非容器影響領域３１ｂを従来より適切に抽出することができ、異物の検出の信頼性を従来より向上することができる。 As described above, the computer 13 sets the second division threshold 42 for dividing the container influence area 31a and the non-container influence area 31b in S109 shown in FIG. (13a) is configured. Further, the computer 13 divides the container affected area 31a and the non-container affected area 31b based on the pixel density distribution and the second division threshold 42 in S104 shown in FIG. 8 and S123 shown in FIG. And constitutes an area dividing means (13b) . Further, the computer 13 determines the presence / absence of a foreign substance in the X-ray image 30 of the non-container affected area 31b in S124 shown in FIG. 10, and constitutes a foreign substance determination means (13c) . Therefore, since the X-ray foreign object detection device 10 divides the container influence area 31a and the non-container influence area 31b based on the pixel density distribution and the second division threshold 42, the container influence area that is an area that does not require detection of foreign substances. 31a can be extracted more appropriately than in the past, and the reliability of foreign object detection can be improved as compared with the prior art. In other words, the X-ray foreign object detection apparatus 10 can more appropriately extract the non-container-affected region 31b that needs to detect foreign objects from the X-ray image 30 of the object 80 to be detected. It can be improved further.

なお、コンピュータ１３は、各画素と異物検出閾値５１とを単純に比較することによって異物の有無を判断するようになっているが、異物の有無をより適切に判断するために、Ｘ線画像３０に所定のフィルタをかけた後、フィルタをかけたＸ線画像３０に対して所定の閾値に基づいて異物の有無を判断するようになっていても良い。   The computer 13 determines the presence / absence of a foreign object by simply comparing each pixel with the foreign object detection threshold value 51, but in order to more appropriately determine the presence / absence of a foreign object, the X-ray image 30 is used. After applying a predetermined filter, the presence / absence of a foreign substance may be determined based on a predetermined threshold for the filtered X-ray image 30.

また、コンピュータ１３は、図８に示すＳ１０５において容器影響領域３１ａをＸ線画像３０に重ねてディスプレイ１４に表示させるようになっており、表示制御手段（１３ｄ）を構成している。また、コンピュータ１３は、図８に示すＳ１０９において利用者によって指定された第２分割閾値４２を設定するようになっている。したがって、Ｘ線異物検出装置１０は、第２分割閾値４２によって分割された容器影響領域３１ａを利用者に見させながら利用者に第２分割閾値４２を指定させることができるので、利用者に第２分割閾値４２を容易に設定させることができる。コンピュータ１３は、図８に示すＳ１０５において容器影響領域３１ａをＸ線画像３０に重ねてディスプレイ１４に表示させるようになっているが、容器影響領域３１ａに代えて非容器影響領域３１ｂをＸ線画像３０に重ねてディスプレイ１４に表示させるようになっていても良いし、容器影響領域３１ａ及び非容器影響領域３１ｂの両方をＸ線画像３０に重ねてディスプレイ１４に表示させるようになっていても良い。 Further, the computer 13 is configured to display the container influence area 31a on the X-ray image 30 on the display 14 in S105 shown in FIG. 8, and constitutes a display control means (13d) . Further, the computer 13 is configured to set the second division threshold 42 designated by the user in S109 shown in FIG. Therefore, the X-ray foreign object detection device 10 can allow the user to specify the second division threshold value 42 while allowing the user to see the container affected area 31a divided by the second division threshold value 42, so that the user can specify the second division threshold value 42. The two-divided threshold value 42 can be easily set. The computer 13 superimposes the container affected area 31a on the X-ray image 30 and displays it on the display 14 in S105 shown in FIG. 8, but instead of the container affected area 31a, the non-container affected area 31b is displayed as an X-ray image. 30 and displayed on the display 14, or both the container-affected area 31 a and the non-container-affected area 31 b may be displayed on the display 14 while being superimposed on the X-ray image 30. .

なお、コンピュータ１３は、非容器影響領域３１ｂのＸ線画像３０における被検査体８０の搬送方向上の位置が等しい画素のうち濃度が最大の画素の濃度を被検査体８０の搬送方向上の位置毎に表したグラフ、即ち図１１に示すようなグラフをディスプレイ１４に表示させるようになっていれば、非容器影響領域３１ｂのＸ線画像３０に対して異物の有無を判断するための異物検出閾値５１を利用者に容易に設定させることができる。   The computer 13 determines the density of the pixel having the highest density among the pixels having the same position in the transport direction of the inspection object 80 in the X-ray image 30 of the non-container affected area 31b in the transport direction of the inspection object 80. If the graph shown every time, that is, the graph as shown in FIG. 11 is displayed on the display 14, the foreign object detection for determining the presence or absence of the foreign object in the X-ray image 30 of the non-container affected area 31 b. The threshold 51 can be easily set by the user.

また、コンピュータ１３は、図８に示す処理の開始前に第１分割閾値４１及び第２分割閾値４２が初期値として予め“１００”に設定されるようになっているが、Ｘ線検出器１２の検出結果の入力後、図８に示す処理の開始前に第１分割閾値４１及び第２分割閾値４２の少なくとも一方を自動的に設定するようになっていても良い。例えば、コンピュータ１３は、Ｘ線検出器１２の検出結果が入力されると、第１分割閾値４１及び第２分割閾値４２の設定用の被検査体８０の図６に示すようなＸ線画像３０における画素の濃度分布に基づいて、最適な第１分割閾値４１及び第２分割閾値４２を自動的に設定した後、図８に示す処理を開始するようになっていても良い。   Further, the computer 13 is configured such that the first division threshold 41 and the second division threshold 42 are set to “100” in advance as initial values before the start of the process shown in FIG. After the detection result is input, at least one of the first division threshold value 41 and the second division threshold value 42 may be automatically set before the processing shown in FIG. 8 is started. For example, when the detection result of the X-ray detector 12 is input to the computer 13, the X-ray image 30 as shown in FIG. 6 of the inspected object 80 for setting the first division threshold value 41 and the second division threshold value 42. The process shown in FIG. 8 may be started after the optimum first division threshold value 41 and the second division threshold value 42 are automatically set based on the pixel density distribution in FIG.

（第２の実施の形態）
第２の実施の形態に係るＸ線異物検出装置の構成は、コンピュータ１３に記録されたプログラムが異なることを除いて、第１の実施の形態に係るＸ線異物検出装置１０（図１参照。）の構成とほぼ同様であるので、Ｘ線異物検出装置１０の構成と同一の符号を付して説明する。 (Second Embodiment)
The configuration of the X-ray foreign object detection device according to the second embodiment is the same as that of the X-ray foreign object detection device 10 according to the first embodiment (see FIG. 1) except that the program recorded in the computer 13 is different. ), The same reference numerals as those of the X-ray foreign object detection apparatus 10 are used.

本実施の形態に係るＸ線異物検出装置の動作について説明する。   An operation of the X-ray foreign object detection device according to the present embodiment will be described.

まず、第１分割閾値４１及び第２分割閾値４２を設定する動作について説明する。   First, an operation for setting the first division threshold 41 and the second division threshold 42 will be described.

コンピュータ１３は、図２４に示すように、図８に示すＳ１０１からＳ１０３までの処理と同様に、Ｓ１４１からＳ１４３までの処理を実行する。次いで、コンピュータ１３は、Ｓ１４３において分割した被検査体領域３１のうち現在の第２分割閾値４２以上の濃度である画素の領域を容器影響領域３１ａの候補である容器影響候補領域３３ａ（図２５参照。）として分割し（Ｓ１４４）、分割した容器影響候補領域３３ａのうち被検査体領域３１の境界に接した領域を図２６に示すように容器影響領域３１ａとし、被検査体領域３１のうち容器影響領域３１ａ以外の領域を非容器影響領域３１ｂとして分割する（Ｓ１４５）。そして、コンピュータ１３は、図８に示すＳ１０５からＳ１１０までの処理と同様に、Ｓ１４６からＳ１５１までの処理を実行して、図２４に示す一連の処理を終了する。   As shown in FIG. 24, the computer 13 executes the processing from S141 to S143 in the same manner as the processing from S101 to S103 shown in FIG. Next, the computer 13 selects a region of a pixel having a density equal to or higher than the current second division threshold value 42 of the inspected region 31 divided in S143 as a container influence candidate region 33a that is a candidate for the container influence region 31a (see FIG. 25). .) Is divided (S144), and among the divided container influence candidate areas 33a, an area in contact with the boundary of the inspected object area 31 is defined as a container affected area 31a as shown in FIG. An area other than the influence area 31a is divided as a non-container influence area 31b (S145). And the computer 13 performs the process from S146 to S151 similarly to the process from S105 to S110 shown in FIG. 8, and complete | finishes a series of processes shown in FIG.

次に、被検査体８０に含まれる異物の有無を検出する動作について説明する。   Next, an operation for detecting the presence / absence of a foreign substance contained in the inspection object 80 will be described.

コンピュータ１３は、図２７に示すように、図１０に示すＳ１２１及びＳ１２２の処理と同様に、Ｓ１６１及びＳ１６２の処理を実行する。次いで、コンピュータ１３は、Ｓ１６２において分割した被検査体領域３１のうち図２４に示す処理によって予め設定されていた第２分割閾値４２以上の濃度である画素の領域を容器影響領域３１ａの候補である容器影響候補領域３３ａとして分割し（Ｓ１６３）、分割した容器影響候補領域３３ａのうち被検査体領域３１の境界に接した領域を容器影響領域３１ａとし、被検査体領域３１のうち容器影響領域３１ａ以外の領域を非容器影響領域３１ｂとして分割する（Ｓ１６４）。そして、コンピュータ１３は、図１０に示すＳ１２４及びＳ１２５の処理と同様に、Ｓ１６５及びＳ１６６の処理を実行して、図２７に示す一連の処理を終了する。   As shown in FIG. 27, the computer 13 executes the processes of S161 and S162 in the same manner as the processes of S121 and S122 shown in FIG. Next, the computer 13 is a candidate for the container influence region 31a in the region to be inspected 31 divided in S162, the pixel region having a density equal to or higher than the second division threshold value 42 set in advance by the process shown in FIG. The container influence candidate area 33a is divided (S163), and the area in contact with the boundary of the inspected object area 31 in the divided container influence candidate area 33a is defined as the container influence area 31a. The other area is divided as the non-container influence area 31b (S164). Then, the computer 13 executes the processing of S165 and S166 similarly to the processing of S124 and S125 shown in FIG. 10, and ends the series of processing shown in FIG.

以上に説明したように、本実施の形態に係るＸ線異物検出装置のコンピュータ１３は、画素の濃度分布及び第２分割閾値４２に基づいて容器影響候補領域３３ａを分割し、被検査体領域３１の境界に接した容器影響候補領域３３ａを容器影響領域３１ａとして分割するようになっている。したがって、本実施の形態に係るＸ線異物検出装置は、被検査体８０のＸ線画像３０のうち実際には異物に対応する領域が誤って容器影響領域３１ａに含まれる可能性を低減することができる。   As described above, the computer 13 of the X-ray foreign object detection device according to the present embodiment divides the container influence candidate region 33a based on the pixel density distribution and the second division threshold value 42, and the object region 31 to be inspected. The container influence candidate area 33a in contact with the boundary is divided as a container influence area 31a. Therefore, the X-ray foreign object detection device according to the present embodiment reduces the possibility that the region actually corresponding to the foreign substance in the X-ray image 30 of the inspected object 80 is erroneously included in the container affected region 31a. Can do.

以上のように、本発明に係るＸ線異物検出装置は、異物の検出が不要な領域を従来より適切に抽出することができ、異物の検出の信頼性を従来より向上することができるという効果を有し、食品等の生産ライン上に設置されるＸ線異物検出装置等として有用である。   As described above, the X-ray foreign object detection device according to the present invention can appropriately extract a region where foreign object detection is unnecessary, and can improve the reliability of foreign object detection compared to the conventional technique. It is useful as an X-ray foreign matter detection device installed on a production line for foods and the like.

本発明の第１の実施の形態に係るＸ線異物検出装置のブロック図The block diagram of the X-ray foreign material detection apparatus which concerns on the 1st Embodiment of this invention （ａ）図１に示すＸ線異物検出装置のＸ線源及びＸ線検出器の正面図 （ｂ）図２（ａ）に示す状況における図２（ａ）に示すＸ線源及びＸ線検出器の側面図(A) Front view of the X-ray source and X-ray detector of the X-ray foreign object detection device shown in FIG. 1 (b) X-ray source and X-ray detection shown in FIG. 2 (a) in the situation shown in FIG. 2 (a) Side view 図１に示すＸ線異物検出装置のディスプレイに表示される画像を示す図The figure which shows the image displayed on the display of the X-ray foreign material detection apparatus shown in FIG. （ａ）図２に示す被検査体の上面図 （ｂ）図４（ａ）に示す被検査体の側面図(A) Top view of the test object shown in FIG. 2 (b) Side view of the test object shown in FIG. 図１に示すＸ線異物検出装置によって生成されたＸ線画像の被検査体領域及び被検査体外領域を示す図The figure which shows the to-be-inspected object area | region of the X-ray image produced | generated by the X-ray foreign material detection apparatus shown in FIG. 図１に示すＸ線異物検出装置によって生成されたＸ線画像における画素の濃度分布を示す図The figure which shows the density distribution of the pixel in the X-ray image produced | generated by the X-ray foreign material detection apparatus shown in FIG. 図１に示すＸ線異物検出装置によって生成されたＸ線画像の被検査体領域の容器影響領域及び非容器影響領域を示す図The figure which shows the container influence area | region and non-container influence area | region of the to-be-inspected object area | region of the X-ray image produced | generated by the X-ray foreign material detection apparatus shown in FIG. 利用者によって分割閾値が設定されるときの図１に示すＸ線異物検出装置の動作のフローチャートA flowchart of the operation of the X-ray foreign object detection device shown in FIG. 1 when the division threshold is set by the user. 利用者によって分割閾値が設定されるときに図１に示すＸ線異物検出装置のディスプレイに表示される画像を示す図The figure which shows the image displayed on the display of the X-ray foreign material detection apparatus shown in FIG. 1 when a division | segmentation threshold value is set by the user. 被検査体に含まれる異物の有無を検出するときの図１に示すＸ線異物検出装置の動作のフローチャートA flowchart of the operation of the X-ray foreign matter detection apparatus shown in FIG. 1 when detecting the presence or absence of foreign matter contained in the object to be inspected. 図１に示すＸ線異物検出装置によって分割された非容器影響領域のＸ線画像における被検査体の搬送方向上の位置が等しい画素のうち濃度が最大の画素の濃度を被検査体の搬送方向における位置毎に表したグラフを示す図In the X-ray image of the non-container-affected area divided by the X-ray foreign substance detection apparatus shown in FIG. 1, the density of the pixel having the highest density among the pixels having the same position in the transport direction of the test object is determined in the transport direction of the test object. The figure which shows the graph which represents every position in （ａ）図２に示す被検査体が図２に示す状況とは異なる状況で搬送されたときの図１に示すＸ線異物検出装置のＸ線源及びＸ線検出器の正面図 （ｂ）図１２（ａ）に示す状況における図１２（ａ）に示すＸ線源及びＸ線検出器の側面図(A) Front view of the X-ray source and X-ray detector of the X-ray foreign object detection device shown in FIG. 1 when the object shown in FIG. 2 is conveyed in a situation different from the situation shown in FIG. Side view of the X-ray source and X-ray detector shown in FIG. 12A in the situation shown in FIG. 図１２に示す状況で被検査体が搬送されたときに図１に示すＸ線異物検出装置によって分割される容器影響領域及び非容器影響領域を示す図The figure which shows the container influence area | region and non-container influence area | region divided | segmented by the X-ray foreign material detection apparatus shown in FIG. 1 when a to-be-inspected object is conveyed in the condition shown in FIG. （ａ）図４に示す被検査体の塊の上面図 （ｂ）図１４（ａ）に示す塊の側面図(A) Top view of the mass of the test object shown in FIG. 4 (b) Side view of the mass shown in FIG. 14 (a) （ａ）図１４に示す塊が搬送されたときの図１に示すＸ線異物検出装置のＸ線源及びＸ線検出器の正面図 （ｂ）図１５（ａ）に示す状況における図１５（ａ）に示すＸ線源及びＸ線検出器の側面図(A) Front view of the X-ray source and X-ray detector of the X-ray foreign object detection device shown in FIG. 1 when the lump shown in FIG. 14 is conveyed (b) FIG. 15 (FIG. 15 () in the situation shown in FIG. Side view of X-ray source and X-ray detector shown in a) 図１５に示す状況で図１４に示す塊が搬送されたときに図１に示すＸ線異物検出装置によって分割される容器影響領域及び非容器影響領域を示す図The figure which shows the container influence area | region and non-container influence area | region divided | segmented by the X-ray foreign material detection apparatus shown in FIG. 1 when the lump shown in FIG. 14 is conveyed in the situation shown in FIG. 図４に示す被検査体とは異なる被検査体の外観斜視図FIG. 4 is an external perspective view of an inspection object different from the inspection object shown in FIG. （ａ）図１７に示す被検査体の塊の上面図 （ｂ）図１８（ａ）に示す塊の側面図(A) Top view of the lump of the test object shown in FIG. 17 (b) Side view of the lump shown in FIG. 18 (a) （ａ）図１８に示す塊が搬送されたときの図１に示すＸ線異物検出装置のＸ線源及びＸ線検出器の正面図 （ｂ）図１９（ａ）に示す状況における図１９（ａ）に示すＸ線源及びＸ線検出器の側面図(A) Front view of the X-ray source and the X-ray detector of the X-ray foreign object detection device shown in FIG. 1 when the lump shown in FIG. 18 is conveyed (b) FIG. 19 (19) in the situation shown in FIG. Side view of X-ray source and X-ray detector shown in a) 図１９に示す状況で図１８に示す塊が搬送されたときに図１に示すＸ線異物検出装置によって分割される容器影響領域及び非容器影響領域を示す図The figure which shows the container influence area | region and non-container influence area | region divided | segmented by the X-ray foreign material detection apparatus shown in FIG. 1 when the lump shown in FIG. 18 is conveyed in the situation shown in FIG. （ａ）図４に示す被検査体及び図１７に示す被検査体とは異なる被検査体の上面図 （ｂ）図２１（ａ）に示す被検査体の側面図(A) Top view of the test object shown in FIG. 4 and the test object different from the test object shown in FIG. 17 (b) Side view of the test object shown in FIG. （ａ）図２１に示す被検査体が搬送されたときの図１に示すＸ線異物検出装置のＸ線源及びＸ線検出器の正面図 （ｂ）図２２（ａ）に示す状況における図２２（ａ）に示すＸ線源及びＸ線検出器の側面図(A) Front view of the X-ray source and X-ray detector of the X-ray foreign object detection device shown in FIG. 1 when the object to be inspected shown in FIG. 21 is transported. (B) Diagram in the situation shown in FIG. Side view of X-ray source and X-ray detector shown in Fig. 22 (a) 図２２に示す状況で図２１に示す被検査体が搬送されたときに図１に示すＸ線異物検出装置によって分割される容器影響領域及び非容器影響領域を示す図22 is a diagram showing a container-affected region and a non-container-affected region that are divided by the X-ray foreign object detection device shown in FIG. 1 when the inspection object shown in FIG. 21 is conveyed in the situation shown in FIG. 利用者によって分割閾値が設定されるときの本発明の第２の実施の形態に係るＸ線異物検出装置の動作のフローチャートA flowchart of the operation of the X-ray foreign object detection device according to the second embodiment of the present invention when the division threshold is set by the user. 本発明の第２の実施の形態に係るＸ線異物検出装置によって分割される容器影響候補領域を示す図The figure which shows the container influence candidate area | region divided | segmented by the X-ray foreign material detection apparatus which concerns on the 2nd Embodiment of this invention. 本発明の第２の実施の形態に係るＸ線異物検出装置によって分割される容器影響領域及び非容器影響領域を示す図The figure which shows the container influence area | region and non-container influence area | region divided | segmented by the X-ray foreign material detection apparatus which concerns on the 2nd Embodiment of this invention. 被検査体に含まれる異物の有無を検出するときの本発明の第２の実施の形態に係るＸ線異物検出装置の動作のフローチャートFlowchart of the operation of the X-ray foreign matter detection apparatus according to the second embodiment of the present invention when detecting the presence or absence of foreign matter contained in the object to be inspected. （ａ）従来のＸ線異物検出装置によって異物の有無が検出される被検査体の上面図 （ｂ）図２８（ａ）に示す被検査体の側面図(A) Top view of an object to be inspected with or without foreign matter detected by a conventional X-ray foreign object detection device (b) Side view of the object to be inspected shown in FIG. （ａ）図２８に示す被検査体が搬送されたときの従来のＸ線異物検出装置のＸ線源及びＸ線検出器の正面図 （ｂ）図２９（ａ）に示す状況における図２９（ａ）に示すＸ線源及びＸ線検出器の側面図(A) Front view of the X-ray source and X-ray detector of the conventional X-ray foreign object detection device when the object to be inspected shown in FIG. 28 is conveyed (b) FIG. 29 (FIG. 29 () in the situation shown in FIG. Side view of X-ray source and X-ray detector shown in a) （ａ）図２９に示す状況で被検査体が搬送されたときにＸ線異物検出装置によって生成される被検査体の画像を示す図 （ｂ）図２９に示す状況で搬送された被検査体の容器の側壁部分の本来の影を示す図 （ｃ）図２９に示すＸ線異物検出装置によって抽出された被検査体の容器の側壁部分の影を示す図(A) The figure which shows the image of the to-be-inspected object produced | generated by the X-ray foreign material detection apparatus, when the to-be-inspected object is conveyed in the condition shown in FIG. 29 (b) The to-be-inspected object conveyed in the condition shown in FIG. The figure which shows the original shadow of the side wall part of the container of (c) The figure which shows the shadow of the side wall part of the container of the to-be-inspected object extracted by the X-ray foreign material detection apparatus shown in FIG. （ａ）図２８に示す被検査体の塊の上面図 （ｂ）図３１（ａ）に示す塊の側面図(A) Top view of the mass of the test object shown in FIG. 28 (b) Side view of the mass shown in FIG. 31 (a) （ａ）図３１に示す塊が搬送されたときの従来のＸ線異物検出装置のＸ線源及びＸ線検出器の正面図 （ｂ）図３２（ａ）に示す状況における図３２（ａ）に示すＸ線源及びＸ線検出器の側面図(A) Front view of the X-ray source and X-ray detector of the conventional X-ray foreign object detection device when the lump shown in FIG. 31 is conveyed (b) FIG. 32 (a) in the situation shown in FIG. 32 (a) Side view of X-ray source and X-ray detector shown in （ａ）図３２に示す状況で被検査体が搬送されたときにＸ線異物検出装置によって生成される被検査体の画像を示す図 （ｂ）図３２に示す状況で搬送された被検査体の容器の側壁部分の本来の影を示す図 （ｃ）図３２に示すＸ線異物検出装置によって抽出された被検査体の容器の側壁部分の影を示す図(A) The figure which shows the image of the to-be-inspected object produced | generated by the X-ray foreign material detection apparatus, when the to-be-inspected object is conveyed in the condition shown in FIG. 32 (b) The to-be-inspected object conveyed in the condition shown in FIG. The figure which shows the original shadow of the side wall part of the container of (c) The figure which shows the shadow of the side wall part of the container of the to-be-inspected object extracted by the X-ray foreign material detection apparatus shown in FIG.

符号の説明Explanation of symbols

１０ Ｘ線異物検出装置
１３ コンピュータ（分割閾値設定手段、領域分割手段、異物判断手段、表示制御手段）
１４ ディスプレイ（表示手段）
３０ Ｘ線画像
３１ 被検査体領域
３１ａ 容器影響領域
３１ｂ 非容器影響領域
３３ａ 容器影響候補領域
４２ 第２分割閾値（分割閾値）
８０ 被検査体
８１ 容器 10 X-ray foreign matter detection device 13 Computer (division threshold setting means, area division means, foreign matter judgment means, display control means)
14 Display (display means)
30 X-ray image 31 Object region 31a Container influence region 31b Non-container influence region 33a Container influence candidate region 42 Second division threshold (division threshold)
80 Inspected object 81 Container

Claims (3)

内容物（８２）が収納された複数の容器（８１）同士が接触して塊状にされて搬送される被検査体（８０）を透過したＸ線量に基づいて生成されたＸ線画像（３０）を処理して前記被検査体に含まれる異物の有無を検出するＸ線異物検出装置（１０）において、
前記Ｘ線画像を所定の領域に分割するための第１分割閾値（４１）および第２分割閾値（４２）を設定する分割閾値設定手段（１３ａ）と、搬送される各被検査体に対応してそれぞれ生成された前記Ｘ線画像の画素の濃度分布及び前記分割閾値設定手段によって設定された前記第１分割閾値に基づいて前記Ｘ線画像を前記被検査体に対応すると想定される被検査体領域（３１）と該被検査体領域外の被検査体外領域（３２）とに分割し、分割された該被検査体領域について画素の濃度分布及び前記分割閾値設定手段によって設定された前記第２分割閾値に基づいて前記被検査体の前記容器の影響が強いと想定される容器影響候補領域（３３ａ）を分割し、該容器影響候補領域のうち前記被検査体領域の境界に接した領域を分割することにより前記複数の容器同士が接触する接触部分を含んでなる容器影響領域（３１ａ）とし該容器影響領域外を非容器影響領域（３１ｂ）として分割する領域分割手段（１３ｂ）と、前記非容器影響領域のみに対して前記異物の有無を判断する異物判断手段（１３ｃ）とを備えたことを特徴とするＸ線異物検出装置。 An X-ray image (30) generated based on the X-ray dose transmitted through the object to be inspected (80) conveyed in a lump by contacting a plurality of containers (81) containing the contents (82 ) In the X-ray foreign matter detection device (10) for detecting the presence or absence of foreign matter contained in the inspection object by processing
A division threshold value setting means (13a) for setting a first division threshold value (41) and a second division threshold value (42) for dividing the X-ray image into predetermined regions, and corresponding to each object to be inspected. The X-ray image assumed to correspond to the object to be inspected based on the density distribution of the pixels of the X-ray image respectively generated and the first division threshold set by the division threshold setting means The second area set by the pixel density distribution and the division threshold setting means is divided into the area (31) and the area outside the object to be inspected (32) outside the area to be inspected. wherein dividing the container effects candidate region influence of the container of the device under test is considered to be stronger (33a) on the basis of the dividing threshold, in contact with the boundary of the inspection object areas of the vessel affected candidate region area by dividing the Serial plurality of containers come into contact with each other and the contact portions comprising at vessel affected area (31a) region division means for dividing the outer container affected area as a non-vessel region of influence (31b) and (13b), said non-container impact area An X-ray foreign matter detection apparatus comprising: a foreign matter judgment means (13c) for judging the presence or absence of the foreign matter only for 画像を表示する表示手段（１４）と、前記容器影響領域（３１ａ）及び前記非容器影響領域（３１ｂ）の少なくとも一方を前記Ｘ線画像（３０）に重ねて前記表示手段に表示させる表示制御手段（１３ｄ）とを備え、
前記分割閾値設定手段（１３）は、利用者によって指定された前記分割閾値（４２）を設定することを特徴とする請求項１に記載のＸ線異物検出装置（１０）。 Display means (14) for displaying an image, and display control means for displaying at least one of the container affected area (31a) and the non-container affected area (31b) on the X-ray image (30) on the display means. (13d)
The X-ray foreign object detection device (10) according to claim 1, wherein the division threshold setting means (13) sets the division threshold (42) designated by a user. 画像を表示する表示手段（１４）と、前記非容器影響領域（３１ｂ）の前記Ｘ線画像（３０）における前記被検査体（８０）の搬送方向上の位置が等しい画素のうち濃度が最大の画素の濃度を前記位置毎に表したグラフを前記表示手段に表示させる表示制御手段（１３ｄ）とを備えたことを特徴とする請求項１に記載のＸ線異物検出装置（１０）。   The display unit (14) for displaying an image and the non-container-affected region (31b) in the X-ray image (30) have the highest density among pixels having the same position in the transport direction of the inspected object (80). The X-ray foreign object detection device (10) according to claim 1, further comprising display control means (13d) for causing the display means to display a graph representing pixel density for each position.
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