CN105866129A - Product surface quality online detection method based on digital projection - Google Patents

Product surface quality online detection method based on digital projection Download PDF

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Publication number
CN105866129A
CN105866129A CN201610334141.6A CN201610334141A CN105866129A CN 105866129 A CN105866129 A CN 105866129A CN 201610334141 A CN201610334141 A CN 201610334141A CN 105866129 A CN105866129 A CN 105866129A
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CN
China
Prior art keywords
product
production line
product surface
defects
projection
Prior art date
Application number
CN201610334141.6A
Other languages
Chinese (zh)
Inventor
段晓杰
时美晨
汪剑鸣
赵鹤
陈丹丹
李秀艳
王�琦
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天津工业大学
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Application filed by 天津工业大学 filed Critical 天津工业大学
Priority to CN201610334141.6A priority Critical patent/CN105866129A/en
Publication of CN105866129A publication Critical patent/CN105866129A/en

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
    • G01N21/84Systems specially adapted for particular applications
    • G01N21/88Investigating the presence of flaws or contamination
    • G01N21/8806Specially adapted optical and illumination features
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
    • G01N21/84Systems specially adapted for particular applications
    • G01N21/88Investigating the presence of flaws or contamination
    • G01N21/89Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/892Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
    • G01N21/84Systems specially adapted for particular applications
    • G01N21/88Investigating the presence of flaws or contamination
    • G01N21/8806Specially adapted optical and illumination features
    • G01N2021/8829Shadow projection or structured background, e.g. for deflectometry
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
    • G01N21/84Systems specially adapted for particular applications
    • G01N21/88Investigating the presence of flaws or contamination
    • G01N21/89Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/892Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
    • G01N2021/8924Dents; Relief flaws

Abstract

The invention discloses a product surface quality online detection method based on digital projection, and avoids defects of certain conventional detection methods, such as uncertain lighting environment, vibration in product delivery process, mutual influence of multiple defects and the like. The implementation processes are as follows: (1) a plane array camera frame is mounted right above a product production line; a plane array camera is mounted in the middle of the camera frame to acquire product images on the production line; (2) a digital projector as a projection system of white light and strip-structured light is mounted on one side of the plane array camera and at a certain height above the product production line; (3) the timing projection and the timing image acquisition are implemented through programming in a computer (or an industrial personal computer); the acquired images are processed according to a digital image processing algorithm; finally a variety of two-dimensional and three-dimensional defects are detected. The product surface quality online detection method provided by the invention combines the digital projection with a machine vision to have real-time rapid measurement and accurate monitoring abilities in a product surface quality online detection process.

Description

A kind of product surface quality online test method based on digital projection

Technical field

The present invention is a kind of product surface quality online test method based on digital projection, and specifically, the present invention is by timesharing sciagraphy respectively By a width White-light image and in cosine function, the black and white strip image of distribution is projected to test product surface in one direction, simultaneously by face battle array phase Machine captured in real-time test product surface image respectively, then in input computer, realizes two to test product surface by Digital Image Processing algorithm Dimension and the on-line checking of 3 D defects.

Background technology

Owing to process industry belongs to column support type industry in China, and along with the technology of manufacturing industry develops and increase with ability, year by year for produce Product quality requires improving constantly.In addition to product self performance and index;Product surface quality also serves as the principal element of its quality judging;Cause The detection of this surface defects of products automatic on-line has become enterprise and has improved one of product quality important method;Surface defects of products does not only have in two dimensional form Defect, such as stain, wrongly typed, cut etc.;There is also the 3 D defects more serious on product quality impact, such as defect, convex closure, dell etc.. Have been developed over detecting system based on computer vision technique at present both at home and abroad to replace manually realizing the detection of the real-time online to surface defects of products, It mainly obtains product surface image by industrial camera, and inputs to computer, according to spies such as the gray value gathered in image, colouring informations Levy detection and the identification realizing defect various to product surface, wherein product surface 3 D defects on the impact of product quality be extremely serious even without Method makes up;In view of product (such as: plank, surface-mounted integrated circuit) production line transmit during also exist vibration, scene lighting environment uncertain Property, greatly affect the detection of product surface 3 D defects, therefore develop a set of can realization and product surface two-dimensional defect and 3 D defects are carried out The computer vision automatic checkout system accurately identifying and distinguishing has important application value.

Summary of the invention

The outstanding advantages of this programme is by projects white light or fringe structure light, and is realized respectively product surface two dimension and three by area array cameras imaging The detection of dimension defect such that it is able to avoid the drawback of more existing detection methods, as uncertain in lighting environment, product transmits process vibrations, multiple Defect influences each other.

The technical solution used in the present invention is, a kind of product surface quality online test method based on digital projection, including following part:

Part I is product on production line image capturing system;

Area array cameras frame is arranged on directly over product line;

Further in camera frame centre, one table top array camera is installed, to gather the product image on production line;Camera frame height face to be met battle array phase Machine shooting field range, i.e. ensure the area array cameras that is arranged on camera frame can photograph production line transverse width in all products;

Part II is white light and striated structure light projection system;

The present invention uses digital projector as white light and striated structure light projection system;

Further in the side of area array cameras, product line is installed on certain altitude this optical projection system;

Further the height of optical projection system can be equal with camera heights, it is also possible to;

Further the line of camera and optical projection system projects the angle between camera frame on a production line is α, wherein 0≤α≤900;

Further projecting white light by computer programming mode is that product surface two-dimensional defect detects light source, projection scope on a production line less than or The shooting field range gathered equal to area array cameras;When product on production line surface exists two-dimensional defect, can well image in area array cameras;

Further projecting fringe structure light by computer programming mode is that product surface 3 D defects detects light source, projection scope on a production line The shooting field range being less than or gather equal to area array cameras, requires in the range of 1m*1m simultaneously, and the quantity of the striped of bright level is greater than Equal to 80;

Further;When there is certain 3 D defects (such as convex closure, depression) in product on production line;The stripe pattern imaging in area array cameras will be caused Deform upon;The detection to product surface 3 D defects and identification can be realized by this deformation.

Part III is visual imaging processing system;

By computer (or industrial computer) upper programming realization timing projection and timing IMAQ;

The product image further respectively obtained under the conditions of White Light Projection on production line by area array cameras, and production line under the conditions of fringe structure light On product image;

The image further gathered by area array cameras is transferred on computer (or industrial computer) process by gigabit network interface or USB port;

Further when product surface exists various two-dimensional defect (such as spot, wrongly typed, cut etc.), by Digital Image Processing algorithm, white light is thrown Under the conditions of shadow, the product surface image of shooting processes, and finally realizes the detection to various two-dimensional defects;

When product surface exists various 3 D defects (such as convex closure, depression etc.), shot under the conditions of structured light projection by Digital Image Processing algorithm Product surface image process, finally realize the detection to various 3 D defects;

Accompanying drawing explanation

Fig. 1 is product surface quality detecting system structure chart of the present invention.

Fig. 2 is product surface quality detecting system schematic diagram of the present invention.

In Fig. 1,1 is computer, and 2 is area array cameras, and 3 is digital projector, and 4 is product to be detected, and 5 is flowing production line, and 6 for producing Line live-roller, 7 is camera frame, and 8 is digital projector view field on a production line.

In Fig. 2,1 is area array cameras, and 2 is digital projector, and 3 is flowing production line, and 4 is production line live-roller, and 5 is camera frame, and 6 is band There is the product to be detected of convex closure 3 D defects.

Detailed description of the invention

The present invention is described in detail with detailed description of the invention below in conjunction with the accompanying drawings.

In FIG, native system hardware is broadly divided into the most several part: camera frame 7 fixedly mounts on the ground, and across product line 8, At the top center installed surface array camera 2 of camera frame 7, adjust its shooting visual field and comprise whole horizontal product line 8, to ensure production line transmission When roller 6 drives product line 7 to move, the image of area array cameras 2 energy captured in real-time to product 4 to be detected in product line 8, and by meter Calculation machine 1 receiving plane array camera 2 collect product surface image to be detected.;Digital projector 3, digital projection are installed in the side of area array cameras 2 The height of instrument 3 and area array cameras 2 highly can be identical, it is also possible to different, wherein the line of area array cameras 2 and digital projector 3 and camera frame 7 Between angle be α;The digital projector 3 horizontal all regions of view field 8 product line to be comprised 8 on a production line.

In fig. 2, when the system is operating, production line live-roller 4 drives product line 3 to move, and according to production line transfer rate, first passes through Computer programming, by the product surface in White-light image projection to production line, triggers area array cameras simultaneously and gathers product surface figure to be detected on production line Picture;The most again by fringe structure light image projection to product surface to be detected, trigger area array cameras simultaneously and shoot by product to be detected on production line Striated surface image;In subsequently the two width images collected being sent to computer and process;

Native system predominantly detects the product that surface is flat form, in machine vision processing system, and the product that can photograph according to White Light Projection condition Surface image, is detected by Digital Image Processing algorithm two-dimensional defect (such as spot, wrongly typed, cut etc.) and identifies;

Change owing to product on production line 3 D defects on surface is mainly manifested in product appearance height, therefore extract product surface height change Value, can realize the detection to 3 D defects, and in fig. 2, product 6 surface to be detected exists convex closure defect, and P is that product surface to be measured is any one Point, when on product surface to be detected without three-dimensional convex closure defect, digital projector 2 should project in plane R the light of B point due to product to be measured Surface convex closure flaw height modulation has projected P point, if the subpoint P ' that P point is on the reference plane.Then the length of PP ' line segment be P point away from The distance of reference planes, i.e. this some height h (x), due to the A point light intensity in plane R with by being projected to P point light intensity phase after testee surface modulation With, photograph digital projector at area array cameras and be projected to test product striated surface image will be displayed as the convex closure defect on test product surface to throwing The modulation penetrating striped is to A point by B point phase shift.Therefore the distance of P point anomaly face R is relevant to by a displacement of B to A point, the most only needs Ask for out by the changing value between stripe pattern and the flawless product stripe pattern of actual acquisition, can realize product surface three-dimensional to be measured is lacked The detection fallen into.

Claims (1)

1. a product surface quality online test method based on digital projection, including following part:
Part I is product on production line image capturing system;
Area array cameras frame is arranged on directly over product line;
Further in camera frame centre, one table top array camera is installed, to gather the product image on production line;Camera frame height face to be met battle array phase Machine shooting field range, i.e. ensure the area array cameras that is arranged on camera frame can photograph production line transverse width in all products;
Part II is white light and striated structure light projection system;
The present invention uses digital projector as white light and striated structure light projection system;
Further in the side of area array cameras, product line is installed on certain altitude this optical projection system;
Further the height of optical projection system can be equal with camera heights, it is also possible to;
Further the line of camera and optical projection system projects the angle between camera frame on a production line is α, wherein 0≤α≤90 °;
Further projecting white light by computer programming mode is that product surface two-dimensional defect detects light source, projection scope on a production line less than or The shooting field range gathered equal to area array cameras;When product on production line surface exists two-dimensional defect, can well image in area array cameras;
Further projecting fringe structure light by computer programming mode is that product surface 3 D defects detects light source, projection scope on a production line The shooting field range being less than or gather equal to area array cameras, requires in the range of 1m*1m simultaneously, and the quantity of the striped of bright level is greater than Equal to 80;
Further;When there is certain 3 D defects (such as convex closure, depression) in product on production line;The stripe pattern imaging in area array cameras will be caused Deform upon;The detection to product surface 3 D defects and identification can be realized by this deformation;
Part III is visual imaging processing system;
By computer (or industrial computer) upper programming realization timing projection and timing IMAQ;
The product image further respectively obtained under the conditions of White Light Projection on production line by area array cameras, and production line under the conditions of fringe structure light On product image;
The image further gathered by area array cameras is transferred on computer (or industrial computer) process by gigabit network interface or USB port;
Further when product surface exists various two-dimensional defect (such as spot, wrongly typed, cut etc.), by Digital Image Processing algorithm, white light is thrown Under the conditions of shadow, the product surface image of shooting processes, and finally realizes the detection to various two-dimensional defects;
When product surface exists various 3 D defects (such as convex closure, depression etc.), shot under the conditions of structured light projection by Digital Image Processing algorithm Product surface image process, finally realize the detection to various 3 D defects.
CN201610334141.6A 2016-05-16 2016-05-16 Product surface quality online detection method based on digital projection CN105866129A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106323600A (en) * 2016-08-31 2017-01-11 武汉精测电子技术股份有限公司 Cascaded distributed AOI defect detection system and detection method thereof
CN106779756A (en) * 2017-01-06 2017-05-31 夏明高 A kind of method that people can be allowed to know product real quality
CN107192717A (en) * 2017-04-26 2017-09-22 深圳市计量质量检测研究院 A kind of 3 D defects detection method and device on object near flat surface
CN107271445A (en) * 2017-05-16 2017-10-20 广州视源电子科技股份有限公司 A kind of defect inspection method and device
CN108955559A (en) * 2018-03-26 2018-12-07 天津工业大学 Three-dimension measuring system structural parameters quick calibrating method under the conditions of one kind is non-parallel

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CN102788803A (en) * 2012-07-09 2012-11-21 南京航空航天大学 On-line high-speed detection system of train wheel set tread and wheel rim and detection method thereof
CN104568963A (en) * 2014-12-17 2015-04-29 华南理工大学 Online three-dimensional detection device based on RGB structured light

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WO1997013140A1 (en) * 1995-10-06 1997-04-10 Photon Dynamics, Inc. Technique for determining defect positions in three dimensions in a transparent structure
CN1963381A (en) * 2005-10-24 2007-05-16 通用电气公司 Method and apparatus for inspecting an object
CN101004389A (en) * 2006-01-18 2007-07-25 宝山钢铁股份有限公司 Method for detecting 3D defects on surface of belt material
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106323600A (en) * 2016-08-31 2017-01-11 武汉精测电子技术股份有限公司 Cascaded distributed AOI defect detection system and detection method thereof
CN106779756A (en) * 2017-01-06 2017-05-31 夏明高 A kind of method that people can be allowed to know product real quality
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CN107271445A (en) * 2017-05-16 2017-10-20 广州视源电子科技股份有限公司 A kind of defect inspection method and device
CN108955559A (en) * 2018-03-26 2018-12-07 天津工业大学 Three-dimension measuring system structural parameters quick calibrating method under the conditions of one kind is non-parallel

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Application publication date: 20160817