CN101858768A - Device and method for detecting liquid level after beverage filling process - Google Patents
Device and method for detecting liquid level after beverage filling process Download PDFInfo
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Abstract
The invention discloses a device and a method for detecting a liquid level after a beverage filling process. The liquid level information after the beverage filling process can be detected by processing an image acquired by an industrial camera. A computing method comprises a liquid level scanning unit, a liquid level acquiring unit and a quality judging unit, and the liquid level can be detected through the change of the gray scale of a region where the liquid level is. The computing method has the advantages of high measuring precision of liquid level detection, high real-time and no harm to a human body. A single product can be produced by the method; and the method can be conveniently adopted in the conventional vision detection device, so that the function of the conventional system can be expanded and the method has a wide application value.
Description
Technical field
The present invention relates to a kind of liquid level after beverage filling pick-up unit and method.
Background technology
In the beverage filling process, because of can't guaranteeing each can amount, bottle placer equates, market produces the excessive or too small situation of can amount, the can amount reduces enterprise profit than conference, the very few corporate image that influences of can amount, so it is necessary to carry out the detection of can amount behind beverage filling, ray detection method commonly used is brought healthy threat to the field personnel easily in the scene at present, therefore is not adapted at non-unmanned workshop and installs and uses.
Machine vision technique can not cause any harm to human body, and more directly perceived accurate, mechanical vision inspection technology has been successfully applied to a lot of industries at present, and for example the empty bottle of beer bottle detects, fields such as the detection of integrated circuit, Machine Vision Detection replace manual detection to become a kind of developing direction.
Vision Builder for Automated Inspection can guarantee under the situation of real-time when the image acquisition partial condition is identical, strengthens the function of Vision Builder for Automated Inspection greatly with software updating method, and escalation process is convenient, and is with low cost.
For detecting the beverage filling amount, for the quality discrimination of beverage after the can provides foundation, the present invention utilizes in the industrial camera collection site production line realtime graphic of beverage after the can, image is passed to processor through data line, by processor according to algorithm computation liquid level provided by the invention and judge whether the can amount qualified, for the step that reaches this purpose the present invention employing is: at first, gather liquid level by the liquid level sweep trace that bar number and length can be set and wait to examine; Secondly, wait to examine the liquid level point that searching can be represented liquid level information in liquid level; Once more, by the position of liquid level point information calculations liquid level in image; At last, whether qualified according to liquid level physical size judgement can amount according to the position and the size relationship of image and the product to be checked physical size of judging liquid level of liquid level in image.
Summary of the invention
In order to achieve the above object, the technical scheme that the present invention implemented is:
A kind of liquid level after beverage filling pick-up unit, this device comprises light source and camera, described light source and camera match with product to be checked; Described camera is connected with the liquid level scanning element of algorithm process device; Described algorithm process device also comprises liquid level acquiring unit and quality discrimination unit, and described liquid level scanning element, liquid level acquiring unit and quality discrimination unit are connected successively; The quality discrimination unit also is connected with algorithm process device opertaing device outward.
Described light source is selected led light source, and light source colour and product color to be checked are complementary, warm colour red light source, cool colour green light source, the colourless white light source of using.
Described camera adopts industrial black and white camera.
A kind of liquid level after beverage filling detection method, this detection method step is as follows:
Step1: at first the product image of gathering to be checked is carried out the liquid level scanning work,, set the information of liquid level sweep trace according to the variable domain of on-the-spot liquid level;
Step2: the liquid level that the liquid level scanning element is sought on the liquid level sweep trace in the Level Detection zone along the direction vertical with liquid level line is waited to examine;
Step3: the zone that the liquid level acquiring unit finds liquid level point value to be checked to distribute and satisfy condition, write down this zone in all liquid levels and treat that cautious is liquid level point;
Step4: the liquid level acquiring unit gets access to after all liquid level point, calculates the true altitude of liquid level in product to be checked;
Step5: the level value and predefined liquid level higher limit and lower limit comparison that the liquid level acquiring unit provides accepted in the quality discrimination unit, then thinks that as level value liquid level is qualified between higher limit and lower limit, otherwise thinks that liquid level is defective;
Step6: opertaing device is rejected the underproof product of can.
Among the described step1, described image is the gray level image that comprises liquid level information that obtains from industrial camera.
Among the described step1, the information of described liquid level sweep trace comprises the bar number and the interval of liquid level sweep trace.
Among the described step3, it is as follows that described liquid level point is sought step:
1) liquid level treats that the initial value of cautious maximal value mnum is 0 in the setting area, regional center position c initial value is the initial a coordinate figure of liquid level sweep trace f, f is the on-the-spot minimum liquid level position a coordinate figure that occurs, stop value stops a coordinate figure t for the liquid level sweep trace, the t value is set at bottleneck position a coordinate figure, and zone radius is r;
2) calculate all liquid levels treat cautious in the liquid level of numerical value between c-r and c+r treat cautious number n um, if num greater than mnum, then mnum=num revises liquid level regional center point levelcenter=c;
3) the c value is added 1, as c〉t, forward step 4) to, otherwise forward step 2 to);
4) write down all liquid levels and treat that it is liquid level point that the cautious middle liquid level of numerical value between levelcenter-r and levelcenter+r waited to examine.
Among the described step4, the calculation procedure of the true altitude of described liquid level in product to be checked is:
(1) calculates the numerical value and the sum of all liquid level point;
(2) mean value of calculating liquid level point obtains liquid level line a axial coordinate lev=sum/mnum;
(3) image and the product matching relationship to be checked that obtains according to industrial camera calculates liquid level, and establishing a coordinate figure of taking product lowest part correspondence to be checked in the visual field is low, and corresponding product true altitude to be checked is h, and described lowest part is relative liquid level; The product true altitude to be checked of every pixel correspondence is pixh, and then liquid level true altitude level is:
level=h+（lev-low）*pixh。
Beneficial effect of the present invention: the present invention detects level gauging precision height, and real-time is good, and can not cause any harm to human body.Both the method that can adopt the present invention to narrate was made independent product, also can add to easily in the existing vision inspection apparatus, and the function of expansion existing system can replace manual detection fully, has using value widely.
Description of drawings
Fig. 1 is for realizing a preferable system structural drawing of the present invention;
Fig. 2 is for realizing algorithmic descriptions synoptic diagram of the present invention;
Wherein, 1 light source, 2 product to be checked, 3 cameras, 4 algorithm process devices, 5 liquid level scanning elements, 6 liquid level acquiring units, 7 quality discrimination unit, 8 opertaing devices, 9 liquid level sweep traces, 10 liquid level lines.
Embodiment
Below in conjunction with accompanying drawing, the present invention is done further introduction in detail:
As shown in Figure 1, a kind of liquid level after beverage filling pick-up unit, this device comprise light source 1 and camera 3, and described light source 1 and camera 3 match with product 2 to be checked; Described camera 3 is connected with the liquid level scanning element 5 of algorithm process device 4; Described algorithm process device 4 also comprises liquid level acquiring unit 6 and quality discrimination unit 7, and described liquid level scanning element 5, liquid level acquiring unit 6 and quality discrimination unit 7 are connected successively; Quality discrimination unit 7 also is connected with algorithm process device 4 opertaing device 8 outward.
The handled image of the present invention from the can on the produced on-site line that adopts industrial camera to gather after beverage, image acquisition part (camera and light source) can be for detecting back lighting and the industrial camera (if colored industrial camera need carry out gray processing to image) that liquid level is installed separately, it also can be the existing system that the scene has similar image acquisition structure, if to the existing image capturing system in scene, then this invention as the function of existing system expansion add among the existing system.
What Fig. 1 was represented is to realize a cover preferable system of the present invention, product 2 to be checked are through there being the zone of back lighting in the system, the image of product 2 to be checked is caught and sends to the algorithm process device 4 at scene on time by industrial camera in the field of illumination, after algorithm process device 4 is handled, testing result is sent to opertaing device 8, when product 2 testing results to be checked are defective, defective product 2 to be checked are picked out pack-thread by opertaing device 8.Wherein the back light suggestion selects toggle speed fast, and energy consumption is low, the led light source that the life-span is long, and light source colour is preferably close with product color to be checked, warm colour red light source, cool colour green light source, the colourless white light source of using.
A axle in the accompanying drawing 2, b axle all are to be the convenient coordinate line of setting of expression algorithm, and the liquid level sweep trace of setting in the algorithm is parallel with a axle vertical with the b axle, and the liquid level scanning line range will comprise whole surveyed area.
Industrial black and white camera is adopted in camera 3 suggestions, and black and white camera image data amount is little, and more accurate to the expression of gradation of image.
Realize in the algorithm process device 4 that a kind of liquid level after beverage filling detection method mainly comprises three parts, i.e. liquid level scanning element 5, liquid level acquiring unit 6 and quality discrimination unit 7.
Liquid level scanning element 5 was at first carried out the work that liquid level scans after picture entered algorithm process device 4, variable domain according to on-the-spot liquid level, set the initial a axial coordinate of liquid level sweep trace and finish a axial coordinate, the bar number of liquid level sweep trace and interval, it is high more that the many more close more then liquid levels of liquid level scanning number of lines are asked for precision, but real-time but reduces along with liquid level increasing of number of lines of scanning.
The liquid level sweep trace is many vertical parallel lines of coordinate axis (b axle) with the liquid level place.
The sweep trace that self-defined number adopted in liquid level scanning is sought the strongest point of grey scale change on the sweep trace along the direction vertical with liquid level line 10 in the Level Detection zone, the pixel grey scale change intensity is with this grey scale pixel value with along the absolute value representation of the difference of the reciprocal neighbor gray-scale value of sweep trace, as the computing formula of pixel p1 grey scale change intensity intensity is
intensity=|gp1-gp2|；
Gp1 remarked pixel p1 gray-scale value wherein, gp2 remarked pixel p1 is along the gray-scale value of the reciprocal neighbor p2 of sweep trace.
Liquid level scanning element 5 is calculated the grey scale change intensity of the pixel on all sweep traces and is write down a axial coordinate of the point that grey scale change intensity is the highest on all sweep traces, these coordinate values is saved as liquid level wait to examine.
The liquid level that liquid level acquiring unit 6 receives liquid level scanning element 5 to be provided is waited to examine, and seeks the most concentrated zone (area size can be set) of liquid level point value distribution to be checked, and all point value to be checked are liquid level point in the posting field.
Liquid level point is sought step following (suppose that the initial a coordinate figure of liquid level sweep trace is f, stopping a coordinate figure is t, and the variable-size zone radius is r)
A) liquid level treats that the initial value of cautious maximal value mnum is 0 in the setting area, regional center position c initial value is that the initial a coordinate figure of liquid level sweep trace f(f value is set at the minimum liquid level position a coordinate figure that the scene may occur), stop value is set at bottleneck position a coordinate figure for the liquid level sweep trace stops a coordinate figure t(t value), zone radius is r;
B) calculate all liquid levels treat cautious in the liquid level of numerical value between c-r and c+r treat cautious number n um, if num greater than mnum, then mnum=num revises liquid level regional center point levelcenter=c;
C) the c value is added 1, as c〉t, forward step (4) to, otherwise forward step (2) to;
D) write down all liquid levels and treat that it is liquid level point that the cautious middle liquid level of numerical value between levelcenter-r and levelcenter+r waited to examine.
Liquid level acquiring unit 6 gets access to after all liquid level point, and according to the actual value of liquid level point numerical value and image and product matching relationship to be checked calculating liquid level, concrete steps are:
(1) calculates the numerical value and the sum of all liquid level point;
(2) mean value of calculating liquid level point obtains a axial coordinate lev=sum/mnum of liquid level line 10;
(3) image and the product matching relationship to be checked that obtains according to industrial camera calculates liquid level, if the corresponding a coordinate figure of product lowest part to be checked in the shooting visual field (liquid level relatively) is low, corresponding product true altitude to be checked is h, the product to be checked of every pixel correspondence highly are pixh, and then liquid level true altitude level is
level=h+（lev-low）*pixh；
The level value and predefined liquid level higher limit and lower limit comparison that liquid level acquiring unit 6 provides accepted in quality discrimination unit 7, then think that as level value liquid level is qualified between higher limit and lower limit, otherwise think that liquid level is defective, liquid level higher limit and lower limit according to enterprise the precision set of patient minimax can amount and filling apparatus, can be set at apart from 3 centimetres of bottlenecks as higher limit, lower limit can be set at apart from 5 centimetres of bottlenecks.
The picture processing finishes quality discrimination unit 7, back result is sent to opertaing device 8, by opertaing device 8 controls the underproof product of can is rejected.
Claims (8)
1. a liquid level after beverage filling pick-up unit is characterized in that, this device comprises light source and camera, and described light source and camera match with product to be checked; Described camera is connected with the liquid level scanning element of algorithm process device; Described algorithm process device also comprises liquid level acquiring unit and quality discrimination unit, and described liquid level scanning element, liquid level acquiring unit and quality discrimination unit are connected successively; The quality discrimination unit also is connected with algorithm process device opertaing device outward.
2. a kind of liquid level after beverage filling pick-up unit as claimed in claim 1 is characterized in that, described light source is selected led light source, and light source colour and product color to be checked are complementary, warm colour red light source, cool colour green light source, the colourless white light source of using.
3. a kind of liquid level after beverage filling pick-up unit as claimed in claim 1 is characterized in that described camera adopts industrial black and white camera.
4. a liquid level after beverage filling detection method that adopts claim 1 is characterized in that, this detection method step is as follows:
Step1: at first the product image of gathering to be checked is carried out the liquid level scanning work,, set the information of liquid level sweep trace according to the variable domain of on-the-spot liquid level;
Step2: the liquid level that the liquid level scanning element is sought on the liquid level sweep trace in the Level Detection zone along the direction vertical with liquid level line is waited to examine;
Step3: the zone that the liquid level acquiring unit finds liquid level point value to be checked to distribute and satisfy condition, write down this zone in all liquid levels and treat that cautious is liquid level point;
Step4: the liquid level acquiring unit gets access to after all liquid level point, calculates the true altitude of liquid level in product to be checked;
Step5: the level value and predefined liquid level higher limit and lower limit comparison that the liquid level acquiring unit provides accepted in the quality discrimination unit, then thinks that as level value liquid level is qualified between higher limit and lower limit, otherwise thinks that liquid level is defective;
Step6: opertaing device is rejected the underproof product of can.
5. a kind of liquid level after beverage filling detection method as claimed in claim 4 is characterized in that, in described step1, described image is the gray level image that comprises liquid level information that obtains from industrial camera.
6. a kind of liquid level after beverage filling detection method as claimed in claim 4 is characterized in that, in described step1, the information of described liquid level sweep trace comprises the bar number and the interval of liquid level sweep trace.
7. a kind of liquid level after beverage filling detection method as claimed in claim 4 is characterized in that, among the described step3, it is as follows that described liquid level point is sought step:
A) liquid level treats that the initial value of cautious maximal value mnum is 0 in the setting area, regional center position c initial value is the initial a coordinate figure of liquid level sweep trace f, f is the on-the-spot minimum liquid level position a coordinate figure that occurs, stop value stops a coordinate figure t for the liquid level sweep trace, the t value is set at bottleneck position a coordinate figure, and zone radius is r;
B) calculate all liquid levels treat cautious in the liquid level of numerical value between c-r and c+r treat cautious number n um, if num greater than mnum, then mnum=num revises liquid level regional center point levelcenter=c;
C) the c value is added 1, as c〉t, forward step 4) to, otherwise forward step 2 to);
D) write down all liquid levels and treat that it is liquid level point that the cautious middle liquid level of numerical value between levelcenter-r and levelcenter+r waited to examine.
8. a kind of liquid level after beverage filling detection method as claimed in claim 4 is characterized in that, in described step4, the calculation procedure of the true altitude of described liquid level in product to be checked is:
1) calculates the numerical value and the sum of all liquid level point;
2) mean value of calculating liquid level point obtains liquid level line a axial coordinate lev=sum/mnum;
3) image and the product matching relationship to be checked that obtains according to industrial camera calculates liquid level, and establishing a coordinate figure of taking product lowest part correspondence to be checked in the visual field is low, and corresponding product true altitude to be checked is h, and described lowest part is relative liquid level; The product true altitude to be checked of every pixel correspondence is pixh, and then liquid level true altitude level is:
level=h+（lev-low）*pixh。
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Cited By (11)
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| CN103718026A (en) * | 2011-06-10 | 2014-04-09 | Khs有限责任公司 | Empty bottle inspection |
| CN105807708A (en) * | 2016-03-04 | 2016-07-27 | 上海应用技术学院 | Metallic film sealing product's liquid level detection action control system |
| CN106780431A (en) * | 2016-11-09 | 2017-05-31 | 上海晨光文具股份有限公司 | Pipe inner stuffing method for detecting position and device |
| CN107044981A (en) * | 2016-12-20 | 2017-08-15 | 浙江工业大学 | A kind of detection method of the PE bottle filling rates based on machine vision |
| CN107437244A (en) * | 2017-06-20 | 2017-12-05 | 广东工业大学 | A kind of medical bag decorates drop capacity visible detection method |
| CN108830824A (en) * | 2018-04-16 | 2018-11-16 | 中北大学 | Transfusion liquid facial vision detects alarm system and its detection method |
| CN112509039A (en) * | 2020-12-16 | 2021-03-16 | 广州大学 | Bottled liquid level detection method and system and storage medium |
| CN112818928A (en) * | 2021-02-26 | 2021-05-18 | 深圳前海微众银行股份有限公司 | Quality detection method, quality detection device, quality detection apparatus, storage medium, and program product |
| WO2021098687A1 (en) * | 2019-11-18 | 2021-05-27 | 中国科学院深圳先进技术研究院 | Volumetric flask volume calibration method and device, terminal device, and storage medium |
| CN115279707A (en) * | 2020-01-08 | 2022-11-01 | Sgd股份有限公司 | Method for treating glass containers comprising optical inspection of the amount of treatment substance dispensed and related treatment installation |
| CN112818928B (en) * | 2021-02-26 | 2024-05-14 | 深圳前海微众银行股份有限公司 | Quality detection method, quality detection device, quality detection apparatus, quality detection storage medium, and quality detection program product |
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Cited By (14)
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| CN103718026B (en) * | 2011-06-10 | 2017-10-10 | Khs有限责任公司 | Empty bottle is checked |
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| CN107044981A (en) * | 2016-12-20 | 2017-08-15 | 浙江工业大学 | A kind of detection method of the PE bottle filling rates based on machine vision |
| CN107437244B (en) * | 2017-06-20 | 2020-10-16 | 广东工业大学 | Visual detection method for dropping volume of medicinal bag |
| CN107437244A (en) * | 2017-06-20 | 2017-12-05 | 广东工业大学 | A kind of medical bag decorates drop capacity visible detection method |
| CN108830824A (en) * | 2018-04-16 | 2018-11-16 | 中北大学 | Transfusion liquid facial vision detects alarm system and its detection method |
| WO2021098687A1 (en) * | 2019-11-18 | 2021-05-27 | 中国科学院深圳先进技术研究院 | Volumetric flask volume calibration method and device, terminal device, and storage medium |
| CN115279707A (en) * | 2020-01-08 | 2022-11-01 | Sgd股份有限公司 | Method for treating glass containers comprising optical inspection of the amount of treatment substance dispensed and related treatment installation |
| CN112509039A (en) * | 2020-12-16 | 2021-03-16 | 广州大学 | Bottled liquid level detection method and system and storage medium |
| CN112818928A (en) * | 2021-02-26 | 2021-05-18 | 深圳前海微众银行股份有限公司 | Quality detection method, quality detection device, quality detection apparatus, storage medium, and program product |
| CN112818928B (en) * | 2021-02-26 | 2024-05-14 | 深圳前海微众银行股份有限公司 | Quality detection method, quality detection device, quality detection apparatus, quality detection storage medium, and quality detection program product |
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