CN103308536B - A kind of X ray can pick-up unit - Google Patents
A kind of X ray can pick-up unit Download PDFInfo
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- CN103308536B CN103308536B CN201210064167.5A CN201210064167A CN103308536B CN 103308536 B CN103308536 B CN 103308536B CN 201210064167 A CN201210064167 A CN 201210064167A CN 103308536 B CN103308536 B CN 103308536B
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Abstract
The present invention relates to a kind of X ray can pick-up unit, comprise x-ray source, linear array detector, processor and connecting gear, described x-ray source and linear array detector lay respectively at above and below connecting gear, x-ray source is positioned at directly over linear array detector center line, described processor connects can be measured and arranges on the transfer mechanism, moves with connecting gear; X-ray source launches X ray downwards, and linear array detector detects X ray through the projected image information after can be measured, and is sent to processor and carries out image procossing.Compared with prior art, the present invention has the high advantage of accuracy of detection.
Description
Technical field
The present invention relates to a kind of x-ray detection device, especially relating to a kind of x-ray detection device for detecting canned pack.
Background technology
In food production, in product, be mixed into other foreign matters people is damaged, often adopt x-ray detection device to detect product.
This detection method generally by x-ray source, linear array X-ray detector, the formations such as connecting gear.Product is flowed in detection window by connecting gear, and overhead guard formula X ray detection mode uses X ray to carry out vertical irradiation to product, and after transmission, light accepts to be converted into image data transmission by detector and processes to processor.Processor is according to the x-ray bombardment product image judgement product situation obtained.
Due at food production field, a lot of product is had to adopt cylindrical can packing, but when adopting said method to carry out vertical X-ray detection, metallic tank body is because density is comparatively greatly not easily by X-ray transmission, the grey value characteristics performance that image shows is closely similar with the foreign matter feature needing to be detected, so be easy to be confused, cause occur that false alarm cannot carry out the situation of foreign bodies detection even at all in general detection.
Summary of the invention
Object of the present invention is exactly to overcome the defect and the X ray can pick-up unit that provides a kind of accuracy of detection high that above-mentioned prior art exists.
Object of the present invention can be achieved through the following technical solutions:
A kind of X ray can pick-up unit, comprise x-ray source, linear array detector, processor and connecting gear, described x-ray source and linear array detector lay respectively at above and below connecting gear, x-ray source is positioned at directly over linear array detector center line, described processor connects can be measured and arranges on the transfer mechanism, moves with connecting gear; X-ray source launches X ray downwards, and linear array detector detects X ray through the projected image information after can be measured, and is sent to processor and carries out image procossing.
The process that processor carries out image procossing specifically comprises the following steps:
1) processor generates projected image according to projected image information;
2) according to the gray threshold preset, binarization segmentation is carried out to image, extract product area;
3) double-deck sciagraphy is adopted to determine surveyed area in product area;
4) in surveyed area, detect foreign matter according to gray feature value, if foreign matter detected, then the image-region that there is foreign matter is demarcated; If foreign matter detected, then end process process.
Step 3) in double-deck sciagraphy be: according to the overhead projector image of the inner tank wall of can be measured and the proj ected bottom image determination intersection area of inner tank wall, this intersection area is surveyed area.
Compared with prior art, present invention utilizes the physical characteristics of X ray, adopt double-deck sciagraphy, the problem that circular canned pack carries out automated regional shielding and foreign bodies detection in overhead guard formula X-ray detecting equipment is solved according to geometrical principle, can the inflow position of automatic decision product when inputting correct product parameters, product recognition detection region in by the image after fan-shaped projection, and recognition methods is simple, process data volume is few, algorithm is simple, be conducive to improving detection efficiency in process of producing product, because what relate in identifying is all fixing parameter, the pin-point accuracy of identified region can be ensured according to product image, thus improve the precision of Product checking.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the process flow diagram that in the present invention, processor carries out image procossing;
Fig. 3 is the schematic diagram of the projected image that the present invention generates;
Fig. 4 is the curve map of two area grayscale values in Fig. 3;
Fig. 5 ~ Fig. 7 is the schematic diagram of the present invention three kinds projection situation;
Fig. 8 is the schematic diagram of the surveyed area that obtains of the present invention and shielding area.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
As shown in Figure 1, a kind of X ray can pick-up unit, comprises x-ray source 1, linear array detector 3, processor 4 and connecting gear 2.Carrying out in design process, needing to carry out device correction to guarantee the precision calculated that projects.First the surface of x-ray source 1, connecting gear 2 and linear array detector 3 need to correct, ensure all to be in horizontality, x-ray source 1 is in directly over linear array detector 3 center line, the fan beam of such transmitting just in time forms an isosceles triangle model on linear array detector 3, linear array detector 3 detects X ray through the projected image information after can be measured, and is sent to processor 4 and carries out follow-up image procossing.
Processor carries out the process of image procossing as shown in Figure 2, specifically comprises the following steps
The first step: processor generates projected image according to projected image information, as shown in Figure 3.
Second step: the gray threshold according to presetting carries out binarization segmentation to image, because the gray-scale value of product area is little, background area gray-scale value is large, the gray threshold chosen should be just two ripple peak-to-peak the most significantly boundary values, product area is extracted, as shown in Figure 4 according in the projected image that gray threshold just obtains like this from previous step.
3rd step: adopt double-deck sciagraphy to determine surveyed area in product area, according to the overhead projector image of the inner tank wall of can be measured and the proj ected bottom image determination intersection area of inner tank wall, this intersection area is surveyed area.
4th step: detect foreign matter according to gray feature value in surveyed area, if foreign matter detected, then the image-region that there is foreign matter is demarcated; If foreign matter detected, then end process process.
In the 3rd above-mentioned step, residing for can be measured, x-ray source and linear array detector, relative position is different, specifically can be divided into three kinds of situations as shown in Fig. 5 ~ 7:
1, as shown in Figure 5, can just in time passes through at middle part, now obtains left side-play amount equal with right side-play amount, now can determine that the home position of product is exactly the center in product area.It is equal that product the upper and lower must be projected as two minor axises on the detector, the concentration ellipse that major axis does not wait.Minor axis length is steady state value, for product inside radius r2, the major axis of view field 1 equals (h1+h2/h1-h3) * r2, the major axis of view field 1 equals (h1+h2/h1) * r2, just can determine Liang Ge view field according to circular and major axis minor axis, in the enterprising row labels of product image, then calculate the common factor of Liang Ge view field, in this case, directly can see that surveyed area is exactly view field 2.Wherein, just like giving a definition:
Left margin point: perpendicular on travelling belt direction, leftmost point in product area;
Right margin point: perpendicular on travelling belt direction, rightmost point in product area;
Perpendicular bisector: cross ray source point in space, detector mid point, and perpendicular to the line of travelling belt and detector horizontal direction;
Left side-play amount: left margin point is from the horizontal range L1 of perpendicular bisector;
Right side-play amount: right margin point is from the horizontal range L2 of perpendicular bisector;
The difference in height on light source and travelling belt surface: h1;
The difference in height of travelling belt and detector surface: h2;
Product height: h3;
Product external radius (comprising tank body thickness): r1;
Product inside radius (not comprising tank body thickness): r2;
View field A: upper strata product area view field on the detector;
View field B: lower floor's product area view field on the detector.
2, as shown in Figure 6, can off center axle, and product still blocks perpendicular bisector.Now left side-play amount and right side-play amount are not etc., and the x coordinate figure in the center of circle of Liang Ge view field is still constant, but abscissa value is different.First the side-play amount of product center of circle skew perpendicular bisector is determined, get that point that side-play amount is maximum, here be assumed to be left side-play amount p, side-play amount rp=(h1-h3)/(h1+h2) * p-r1 of the corresponding center of circle and perpendicular bisector, so just determine the position that product flows into.The center of circle of view field 1 is (h1+h2/h1-h3) * rp from perpendicular bisector distance (upper circular projection length), major axis does not become (h1+h2/h1-h3) * r2.The center of circle of view field 2 is (h1+h2/h1) * rp from perpendicular bisector distance (lower circular projection length), major axis does not become (h1+h2/h1) * r2.So just determine Liang Ge view field.
3, as shown in Figure 7, can off center axle is comparatively far away, and product does not cover perpendicular bisector, whole in the side of sector region.At this moment the method for Qiu Liangge view field is the same with the second situation, but in this case, the area of surveyed area is relatively little, at this moment because beam irradiating angle is too inclined, causes check frequency to become large, should avoid in actual applications as far as possible.By using spacing lever, by the inflow position limitation of can in a rational deviation range, prevent the situation of this relative position.
Present invention utilizes the physical characteristics of X ray, adopt double-deck sciagraphy, the problem that circular canned pack carries out automated regional shielding and foreign bodies detection in overhead guard formula X-ray detecting equipment is solved according to geometrical principle, can the inflow position of automatic decision product when inputting correct product parameters, product recognition detection region in by the image after fan-shaped projection, and recognition methods is simple, process data volume is few, algorithm is simple, be conducive to improving detection efficiency in process of producing product, because what relate in identifying is all fixing parameter, the pin-point accuracy of identified region can be ensured according to product image, thus improve the precision of Product checking.
Claims (1)
1. an X ray can pick-up unit, it is characterized in that, comprise x-ray source, linear array detector, processor and connecting gear, described x-ray source and linear array detector lay respectively at above and below connecting gear, x-ray source is positioned at directly over linear array detector center line, described processor connects can be measured and arranges on the transfer mechanism, moves with connecting gear; X-ray source launches X ray downwards, and linear array detector detects X ray through the projected image information after can be measured, and is sent to processor and carries out image procossing;
The process that processor carries out image procossing specifically comprises the following steps:
1) processor generates projected image according to projected image information;
2) according to the gray threshold preset, binarization segmentation is carried out to image, extract product area;
3) double-deck sciagraphy is adopted to determine surveyed area in product area;
4) in surveyed area, detect foreign matter according to gray feature value, if foreign matter detected, then the image-region that there is foreign matter is demarcated; If foreign matter detected, then end process process;
Step 3) in double-deck sciagraphy be: according to the overhead projector image of the inner tank wall of can be measured and the proj ected bottom image determination intersection area of inner tank wall, this intersection area is surveyed area;
Surface and the linear array detector of x-ray source, connecting gear are all in horizontality, and the fan beam launched so just in time forms an isosceles triangle model on linear array detector.
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| CN201210064167.5A CN103308536B (en) | 2012-03-12 | 2012-03-12 | A kind of X ray can pick-up unit |
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| CN201210064167.5A CN103308536B (en) | 2012-03-12 | 2012-03-12 | A kind of X ray can pick-up unit |
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| CN103308536B true CN103308536B (en) | 2015-11-04 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104458778A (en) * | 2014-12-19 | 2015-03-25 | 山东明佳包装检测科技有限公司 | Detection device for foods in closed container |
| CN104677924A (en) * | 2015-02-11 | 2015-06-03 | 东莞市嘉仪自动化设备科技有限公司 | 360-degree nondestructive seaming detection equipment and 360-degree nondestructive seaming detection method |
| CN105758865B (en) * | 2016-04-26 | 2019-02-01 | 河南工业大学 | Detection system based on foreign matter in THz wave detection grain packaging object |
| CN113792842A (en) * | 2021-10-02 | 2021-12-14 | 华畤迪科技(无锡)有限公司 | X-ray perspective intelligent detection equipment |
| CN116049756B (en) * | 2023-04-03 | 2023-06-09 | 天津市天立独流老醋股份有限公司 | Intelligent monitoring management system and method for food processing equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1342898A (en) * | 2000-09-04 | 2002-04-03 | 株式会社石田 | Foreign body testing device using x-ray |
| CN201749091U (en) * | 2010-02-04 | 2011-02-16 | 上海英迈吉东影图像设备有限公司 | Coal mine belt X-ray perspective detection system |
| CN102192917A (en) * | 2010-03-10 | 2011-09-21 | 上海太易检测技术有限公司 | Linear array X-ray detecting system functioning in recognition of foreign bodies in foods |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101111758A (en) * | 2005-02-01 | 2008-01-23 | 皇家飞利浦电子股份有限公司 | Apparatus and method for correction or extension of x-ray projections |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1342898A (en) * | 2000-09-04 | 2002-04-03 | 株式会社石田 | Foreign body testing device using x-ray |
| CN201749091U (en) * | 2010-02-04 | 2011-02-16 | 上海英迈吉东影图像设备有限公司 | Coal mine belt X-ray perspective detection system |
| CN102192917A (en) * | 2010-03-10 | 2011-09-21 | 上海太易检测技术有限公司 | Linear array X-ray detecting system functioning in recognition of foreign bodies in foods |
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Address after: 215132 No.7, Gaoyang Road, Huangdai Town, Xiangcheng District, Suzhou City, Jiangsu Province Patentee after: SUZHOU TAIYI INSPECTION EQUIPMENT Co.,Ltd. Address before: Huang Qiao Jie Dao Sheng Tian Cun, Xiangcheng District, Suzhou City, Jiangsu Province Patentee before: SUZHOU TAIYI INSPECTION EQUIPMENT Co.,Ltd. |