CN109461156A - The threaded closure plug assembly and detection method of view-based access control model - Google Patents

The threaded closure plug assembly and detection method of view-based access control model Download PDF

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Publication number
CN109461156A
CN109461156A CN201811561215.5A CN201811561215A CN109461156A CN 109461156 A CN109461156 A CN 109461156A CN 201811561215 A CN201811561215 A CN 201811561215A CN 109461156 A CN109461156 A CN 109461156A
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closure plug
threaded closure
image
access control
view
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CN109461156B (en
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武建伟
魏小保
朱伟
徐念
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Research Institute of Zhejiang University Taizhou
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/0002—Inspection of images, e.g. flaw detection
    • G06T7/0004—Industrial image inspection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/34—Sorting according to other particular properties
    • B07C5/342—Sorting according to other particular properties according to optical properties, e.g. colour
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00—Image enhancement or restoration
    • G06T5/20—Image enhancement or restoration by the use of local operators
    • G06T5/30—Erosion or dilatation, e.g. thinning
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/10—Segmentation; Edge detection
    • G06T7/136—Segmentation; Edge detection involving thresholding
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/30—Subject of image; Context of image processing
    • G06T2207/30108—Industrial image inspection
    • G06T2207/30164—Workpiece; Machine component

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Quality & Reliability (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Image Analysis (AREA)

Abstract

The invention discloses a kind of threaded closure plug assembly and detection methods of view-based access control model, it the image of different station and is analyzed and processed in assembling process by obtaining threaded closure plug, judge whether each step of assembling link is normal based on the analysis results, to reduce the defect rate of assembly product.

Description

The threaded closure plug assembly and detection method of view-based access control model
Technical field
The present invention relates to a kind of threaded closure plug assembly and detection methods of view-based access control model, are applied to sealing-plug Automated assembly The on-line checking of assembling process in equipment.
Background technique
Machine vision is exactly to substitute human eye with machine to measure and judge, NI Vision Builder for Automated Inspection is set by Image Acquisition It is standby to obtain data image signal, it is then communicated to vision processing system, according to pixel distribution feature in image, is schemed accordingly As handling to extract required information, to realize the defects detection of measuring targets, dimensional measurement etc..One typical industry Machine Vision Inspecting System should include image collecting device, vision processing system, light source, sensor and control unit.
Demand with sealing-plug in field of automobile parts and components increasingly increases, and user is also higher and higher to its quality requirements. Due to each piece volumes of threaded closure plug are less than normal, more than installation step and assembly amount is big, be easy to appear in assembling process neglected loading, Situations such as misloading, not only low efficiency, detection accuracy are low for artificial detection, large labor intensity, also increase the production cost of enterprise.
Summary of the invention
Present invention aim to address sealing-plug groove glue-spreads in current threaded closure plug automatic assembly production line not Uniformly, magnet and sealing ring installation easily inclination or neglected loading, artificial detection threaded closure plug assembling quality low efficiency, precision be low and labor The big technical problem of fatigue resistance.
To realize that the above goal of the invention, the present invention provide a kind of threaded closure plug assembly and detection method of view-based access control model, wrap Include following steps:
(1) photoelectric sensor triggers industrial camera: obtaining a front surface and a side surface of threaded closure plug respectively using two industrial cameras Picture, when threaded closure plug with dial movement to designated position when, detected respectively by two photoelectric sensors and move to corresponding position The threaded closure plug set simultaneously generates trigger signal, and trigger signal is respectively transmitted to corresponding industrial camera；
(2) industrial camera obtains picture: after photoelectric sensor triggers industrial camera, being located at threaded closure plug positive first Industrial camera is used to obtain the top view RGB color image of threaded closure plug cock body, the second work positioned at threaded closure plug side Industry camera is used to obtain the gray level image of threaded closure plug assembly；
(3) vision system image procossing: after two industrial cameras successively obtain image, start by vision system respectively to image It is handled, vision system program uses parallel process, wherein the first main flow is used to handle the RGB color image, to sentence Whether disconnected threaded closure plug groove glue-spread is up to standard, and the second main flow is located at screw thread for handling the gray level image, with judgement Whether the magnet of sealing-plug cock body top surface and the sealing ring of threaded closure plug cock body pedestal are installed in place；If the inspection of two main flows It surveys result to meet the requirements, then exports qualifying signal, qualified products are discharged by cutting agency.
Further, the first main flow described in step (3) is as follows to the treatment process of the RGB color image: to figure As carrying out color extraction under HSV color model, a width bianry image is obtained after extraction, then morphology is carried out to bianry image The expansive working of processing fills minuscule hole, then establishes ROI using threaded closure plug as the center of circle, the area ratio thread seal of ROI Plug is big, and finally using the white connected domain in Blob analysis ROI, this connected domain is groove glue bearing areas, if the picture in the region S is in (S for vegetarian noodles productmin,Smax) in range, then determine that glue-spread meets the requirements and export OK signal, otherwise determine that glue-spread is not met It is required that and exporting NG signal, rejecting rejected part.
Further, the second main flow described in step (3) is as follows to the treatment process of the gray level image:
Binarization operation is carried out to the gray level image, wherein lowest threshold is 200, and highest threshold value is 255, then establishes two Rectangle ROI region R1, R2 detects the spacing H on most wide two sides on vertical direction in first rectangle ROI region R1, if Away from H in (Hmin, Hmax) then show that magnet installation is normal in pixel range, otherwise magnet installation is abnormal and exports NG signal, picks Except rejected part；In second rectangle ROI region R2 on detection level direction most wide two sides spacing W, if spacing W exists (Wmin, Wmax) then show that sealing ring installation is normal in pixel range, otherwise sealing ring installation is abnormal and exports NG signal, rejects Rejected part.
Further, first industrial camera is color camera, collocation common lens and annular shadowless light source.
Further, second industrial camera is black and white camera, arrange in pairs or groups telecentric lens and rectangular backlight.
Compared with prior art, the beneficial effects of the present invention are:
The present invention obtains digital picture of the sealing-plug under different station by two industrial cameras respectively, utilizes vision software pair The image of acquisition is analyzed and processed, to judge whether the assembly result of each step meets the requirements, is realized and is assembled to sealing-plug The automatic real-time online detection of link, not only greatlys save manpower, but also can reduce the defect rate of discharging product.
Detailed description of the invention
Fig. 1 is the workflow schematic diagram of one embodiment of the invention；
Fig. 2 is the schematic illustration of vision detection system in one embodiment of the invention；
Fig. 3 is the explosive view of threaded closure plug；
Fig. 4 is the assembly front view of threaded closure plug；
Fig. 5 is the cock body structural schematic diagram of threaded closure plug；
Fig. 6 is the ring structure schematic diagram of threaded closure plug；
Fig. 7 is the magnet arrangement schematic diagram of threaded closure plug；
Fig. 8 is sealing-plug assembly binary map.
Specific embodiment
Preferred descriptions are made to the present invention in the following with reference to the drawings and specific embodiments.
As shown in figures 1-8, the threaded closure plug assembly and detection method of the view-based access control model of one embodiment of the invention, including (1) photoelectric sensor triggers industrial camera: obtain a front surface and a side surface picture of threaded closure plug respectively using two industrial cameras, When threaded closure plug with dial movement to designated position when, detect the spiral shell for moving to corresponding position respectively by two photoelectric sensors Line sealing-plug simultaneously generates trigger signal, and trigger signal is respectively transmitted to corresponding industrial camera；
(2) industrial camera obtains picture: after photoelectric sensor triggers industrial camera, being located at threaded closure plug positive first Industrial camera is used to obtain the top view RGB color image of threaded closure plug cock body, the second work positioned at threaded closure plug side Industry camera is used to obtain the gray level image of threaded closure plug assembly；Such as Fig. 2, the first industrial camera uses color camera, collocation Common lens and annular shadowless light source, the second industrial camera use black and white camera, arrange in pairs or groups telecentric lens and rectangular backlight；
(3) vision system image procossing: after two industrial cameras successively obtain image, start by vision system respectively to image It is handled, vision system program uses parallel process, wherein the first main flow is used to handle the RGB color image, to sentence Whether disconnected threaded closure plug groove (such as Fig. 5) glue-spread is up to standard, and the second main flow is for handling the gray level image, to judge position Whether it is installed in place in the magnet of threaded closure plug cock body top surface and the sealing ring of threaded closure plug cock body pedestal；If two mainstreams The testing result of journey meets the requirements, then exports qualifying signal, and qualified products are discharged by cutting agency.
Preferably, the first main flow described in step (3) is as follows to the treatment process of the RGB color image: to image Color extraction is carried out under HSV (tone, saturation degree, lightness) color model, the tone range of extraction is (125,290), saturation Spending range is (100,220), and lightness range is (40,220), a width bianry image is obtained after extraction, then carry out to bianry image The expansive working of Morphological scale-space fills minuscule hole, then establishes ROI(area-of-interest) using threaded closure plug as the center of circle, ROI size is bigger than threaded closure plug, finally utilizes Blob(spot) white connected domain in analysis ROI, this connected domain is as recessed Slot glue bearing areas, if the elemental area S in the region is in (Smin,Smax) in range, then determine that glue-spread meets the requirements and exports OK Otherwise (passing through) signal determines that glue-spread is undesirable and exports NG(and does not pass through) signal, reject rejected part.In this hair The range that normal gluing elemental area S is measured under bright experiment condition is (18000,20000), is artificially determined according to different operating conditions Smin、SmaxPractical value.
Preferably, the second main flow described in step (3) is as follows to the treatment process of the gray level image:
Binarization operation is carried out to the gray level image, wherein lowest threshold is 200, and highest threshold value is 255, then establishes two Rectangle ROI region R1, R2, as shown in figure 8, detecting most wide two sides on vertical direction in first rectangle ROI region R1 Spacing H, if spacing H is in (Hmin, Hmax) then show that magnet installation is normal in pixel range, otherwise magnet installation is abnormal and exports NG signal, reject rejected part, measured under experiment condition of the invention magnet normal mounting height pixel range be (480, 520), H is artificially determined according to different operating conditionsmin、HmaxPractical value；The detection level direction in second rectangle ROI region R2 On most wide two sides spacing W, if spacing W is in (Wmin, Wmax) then show that sealing ring installation is normal in pixel range, otherwise seal Circle installation is abnormal and exports NG signal, rejects rejected part, measures sealing ring under experiment condition of the invention and normally pacify Filling width pixel range is (530,580), artificially determines W according to different operating conditionsmin、WmaxPractical value.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff is complete Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.

Claims (5)

1. the threaded closure plug assembly and detection method of view-based access control model, which comprises the steps of:
(1) photoelectric sensor triggers industrial camera: obtaining a front surface and a side surface of threaded closure plug respectively using two industrial cameras Picture, when threaded closure plug with dial movement to designated position when, detected respectively by two photoelectric sensors and move to corresponding position The threaded closure plug set simultaneously generates trigger signal, and trigger signal is respectively transmitted to corresponding industrial camera；
(2) industrial camera obtains picture: after photoelectric sensor triggers industrial camera, being located at threaded closure plug positive first Industrial camera is used to obtain the top view RGB color image of threaded closure plug cock body, the second work positioned at threaded closure plug side Industry camera is used to obtain the gray level image of threaded closure plug assembly；
(3) vision system image procossing: after two industrial cameras successively obtain image, start by vision system respectively to image It is handled, vision system program uses parallel process, wherein the first main flow is used to handle the RGB color image, to sentence Whether disconnected threaded closure plug groove glue-spread is up to standard, and the second main flow is located at screw thread for handling the gray level image, with judgement Whether the magnet of sealing-plug cock body top surface and the sealing ring of threaded closure plug cock body pedestal are installed in place；If the inspection of two main flows It surveys result to meet the requirements, then exports qualifying signal, qualified products are discharged by cutting agency.
2. the threaded closure plug assembly and detection method of view-based access control model as described in claim 1, which is characterized in that in step (3) First main flow is as follows to the treatment process of the RGB color image: color is carried out under HSV color model to image It extracts, a width bianry image is obtained after extraction, then carry out the expansive working of Morphological scale-space to bianry image, fill tiny sky Then ROI is established using threaded closure plug as the center of circle in hole, the area ratio threaded closure plug of ROI is big, finally analyzes ROI using Blob Interior white connected domain, this connected domain are groove glue bearing areas, if the elemental area S in the region is in (Smin,Smax) in range, Then determine that glue-spread meets the requirements and exports OK signal, otherwise determines that glue-spread is undesirable and exports NG signal, reject not Qualified parts.
3. the threaded closure plug assembly and detection method of view-based access control model as described in claim 1, which is characterized in that in step (3) Second main flow is as follows to the treatment process of the gray level image:
Binarization operation is carried out to the gray level image, wherein lowest threshold is 200, and highest threshold value is 255, then establishes two Rectangle ROI region R1, R2 detects the spacing H on most wide two sides on vertical direction in first rectangle ROI region R1, if Away from H in (Hmin, Hmax) then show that magnet installation is normal in pixel range, otherwise magnet installation is abnormal and exports NG signal, picks Except rejected part；In second rectangle ROI region R2 on detection level direction most wide two sides spacing W, if spacing W exists (Wmin, Wmax) then show that sealing ring installation is normal in pixel range, otherwise sealing ring installation is abnormal and exports NG signal, rejects Rejected part.
4. the threaded closure plug assembly and detection method of view-based access control model as described in claim 1, which is characterized in that first work Industry camera is color camera, collocation common lens and annular shadowless light source.
5. the threaded closure plug assembly and detection method of view-based access control model as described in claim 1, which is characterized in that second work Industry camera is black and white camera, arrange in pairs or groups telecentric lens and rectangular backlight.
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CN112164036A (en) * 2020-09-15 2021-01-01 西安交通大学 Device and method for detecting assembly parameters of steel wire thread insert
CN112712501A (en) * 2020-12-28 2021-04-27 江苏合泰飞梵科技有限公司 Rearview mirror assembly production method based on artificial intelligence
CN112858312A (en) * 2021-01-20 2021-05-28 上海工程技术大学 Pen cap silicon bead installation visual detection device and method
CN114799806A (en) * 2022-05-31 2022-07-29 大连四达高技术发展有限公司 Automatic bullet body assembling system based on reaction force arm and vision technology

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Publication number Priority date Publication date Assignee Title
CN112164036A (en) * 2020-09-15 2021-01-01 西安交通大学 Device and method for detecting assembly parameters of steel wire thread insert
CN112164036B (en) * 2020-09-15 2022-06-07 西安交通大学 Device and method for detecting assembly parameters of steel wire thread insert
CN112712501A (en) * 2020-12-28 2021-04-27 江苏合泰飞梵科技有限公司 Rearview mirror assembly production method based on artificial intelligence
CN112858312A (en) * 2021-01-20 2021-05-28 上海工程技术大学 Pen cap silicon bead installation visual detection device and method
CN114799806A (en) * 2022-05-31 2022-07-29 大连四达高技术发展有限公司 Automatic bullet body assembling system based on reaction force arm and vision technology

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Record date: 20231116

Application publication date: 20190312

Assignee: Zhejiang Yulong Biotechnology Co.,Ltd.

Assignor: RESEARCH INSTITUTE OF ZHEJIANG University TAIZHOU

Contract record no.: X2023980047040

Denomination of invention: Visual based assembly inspection method for threaded sealing plugs

Granted publication date: 20210716

License type: Common License

Record date: 20231116

Application publication date: 20190312

Assignee: Jiaxing Weihua Biological Packaging Co.,Ltd.

Assignor: RESEARCH INSTITUTE OF ZHEJIANG University TAIZHOU

Contract record no.: X2023980047032

Denomination of invention: Visual based assembly inspection method for threaded sealing plugs

Granted publication date: 20210716

License type: Common License

Record date: 20231116

Application publication date: 20190312

Assignee: Jiaxing Chenfeng Food Co.,Ltd.

Assignor: RESEARCH INSTITUTE OF ZHEJIANG University TAIZHOU

Contract record no.: X2023980047030

Denomination of invention: Visual based assembly inspection method for threaded sealing plugs

Granted publication date: 20210716

License type: Common License

Record date: 20231116

Application publication date: 20190312

Assignee: Zhejiang Wanhao Optoelectronic Technology Co.,Ltd.

Assignor: RESEARCH INSTITUTE OF ZHEJIANG University TAIZHOU

Contract record no.: X2023980047027

Denomination of invention: Visual based assembly inspection method for threaded sealing plugs

Granted publication date: 20210716

License type: Common License

Record date: 20231116