CN103630553B - The pick-up unit of a kind of lens surface point-like and wire impurity - Google Patents
The pick-up unit of a kind of lens surface point-like and wire impurity Download PDFInfo
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- CN103630553B CN103630553B CN201310543198.3A CN201310543198A CN103630553B CN 103630553 B CN103630553 B CN 103630553B CN 201310543198 A CN201310543198 A CN 201310543198A CN 103630553 B CN103630553 B CN 103630553B
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Abstract
The present invention discloses the pick-up unit of a kind of lens surface point-like and wire impurity, be mainly used in the detection distinguishing eyeglass defect and lens surface point-like and wire impurity, it comprises the base of each parts of Supporting connectivity and support, the clamping device fixedly treating object plate, image collecting device, annular light source, air pressure nozzle and control and disposal system; Described image collecting device is vertically installed in be treated above object plate; Described air pressure nozzle have two and more than, be placed in the upper and lower sides treating object plate respectively; Described air pressure nozzle and cylinders; Described annular light source is looped around lens side surrounding.This invention can collect by the cooperation of air pressure nozzle and annular light source the image that air pressure nozzle sprays front and back, and judges that picture point is defect or impurity by image recognition mode.
Description
Technical field
The present invention relates to the pick-up unit of a kind of lens surface point-like and wire impurity, referring to the pick-up unit for distinguishing eyeglass defect and lens surface point-like and wire impurity especially.
Background technology
The flaw inspection of eyeglass is the link of very important guarantee lens quality.At present, all adopt manual detection mode in most eyeglass factory of China, not only efficiency is low for it, and the impact of examined personnel's skill level, causes Detection job uneven.Vision-based detection is adopted to have the advantages such as speed is fast, precision is high, cost is low, constant product quality.The patent No. be 201210180997.4 patent of invention propose a kind of method for quick of lens defects, but the method cannot distinguish lens surface impurity and lens defects.Due to the impact of workshop condition, even if at dust-free workshop, lens surface still has the various impurity such as dust, fiber, and the lens surface moment has on new impurity falls.Due to these impurity and defect relatively, this detection method is difficult to these impurity and defect to distinguish come, and increases the false drop rate of system.Because the adhesion of lens surface impurity is little, under the action of high-speed airflow of air pressure nozzle ejection, be easy to leave lens surface or change position.Although lens surface still likely produces new impurity while airflow function, but by the variation of contrast airflow function front and rear surfaces impurity, be easy to the point-like and the wire impurity that identify lens surface, thus the impact that reduction surface impurity detects eyeglass.
Summary of the invention
The object of the present invention is to provide a kind of lens surface point-like and wire impurity detection device.Can accurately detect eyeglass defect, and identify lens surface impurity, despumation is disturbed, and reduces false drop rate, improves the quality of products, reduce costs.
Technical solution of the present invention is: the pick-up unit of a kind of lens surface point-like and wire impurity, comprise the base of each parts of Supporting connectivity and support, the clamping device of placement fixing len, an image collecting device, annular light source, two air pressure nozzles, wherein image collecting device is placed in above eyeglass, light source is around eyeglass, and air pressure nozzle is placed in eyeglass upper and lower sides respectively.
In technique scheme, described annular light source comprises the annular homogenous diffusion plate of a circular base and inside thereof and multiple light emitting diode be located between circular base and circumferential dispersion plate.
The pick-up unit of a kind of lens surface point-like and wire impurity, comprise the base of each parts of Supporting connectivity and support, the clamping device fixedly treating object plate, image collecting device, annular light source, air pressure nozzle and control and disposal system, described image collecting device is vertically installed in be treated above object plate, and described image collecting device visual field is greater than optic diameter and pixel meets minimum impurity resolution requirement; Described air pressure nozzle have two and more than, be placed in the upper and lower sides treating object plate respectively, described air pressure nozzle and cylinders; Described control is connected with image collecting device with switching cylinder with disposal system; Described annular light source is looped around lens side surrounding.
Described annular light source is made up of the annular homogenous diffusion plate of a circular base and inside thereof and multiple light emitting diode be located between circular base and circumferential dispersion plate, and the width W of described annular light source and lens thickness H to be detected meet: 1.1H≤W≤2H.
Described clamping device comprises pedestal and the clamp device of band groove, and described clamp device is made up of more than three and three shell fragments, and is equally spaced between shell fragment, and the degree of depth h of described groove meets with the relation of the thickness H treating object plate: 0.2H≤h≤0.5H.
Outside the visual field that described air pressure nozzle is placed in described image collecting device and annular light source, described air pressure nozzle and treat that the angle a between object plate meets: 0 degree≤a≤20 degree.
Described control and disposal system are for controlling described image acquisition device image and cylinder gas jet, described control and disposal system gather air pressure nozzle spray before the first image and air pressure nozzle spray after the second image and carry out contrast and judge whether to there is impurity, its processing procedure is:
(501) Image semantic classification: denoising is carried out to the first image and the second image by medium filtering;
(502) Iamge Segmentation: the eyeglass of the first image and the second image is split from background by threshold method or edge-detected image partitioning algorithm;
(503) feature extraction: the feature extracting defect or impurity;
(504) defect and impurities identification: the position of the picture point of defect or impurity in comparison first image and the second image, and form coupling is carried out to the picture point of same position, to be defined as defect or impurity;
(505) result exports: according to the recognition result of step (504).
Described cylinder provides the pressurized air of clean dried to form high velocity air, and containing charged gaseous ion in pressurized air.
The invention has the beneficial effects as follows: use low angle annular light source, the width due to light source is greater than the thickness of eyeglass, and is in same plane with eyeglass, thus some light is incident by lens side, some light is reflected by lens surface with low angle simultaneously.Due to the scattering of defect, the defect and the impurity that are positioned at the inner defect of eyeglass and surface all have bright feature, make the gray-scale value of the defect image of collection be greater than background gray levels, have bright feature; Do not have the light of the partial dispersion of defect fewer simultaneously, make the gray-scale value of image background lower than the gray-scale value of defect and impurity, there is dark feature, add picture contrast, thus easily identify defect and impurity.
Because placed air pressure nozzle at eyeglass upper and lower sides, the high velocity air of air pressure nozzle ejection can blow impurity off or change the position of impurity, and can not have an impact to the position of fixing len, lens surface point-like and wire impurity can be identified by picture before and after contrast, thus impurity and defect difference are come, get rid of surface attachment impurity to the impact of defect identification, can position impurity simultaneously.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of embodiment of the present invention pick-up unit;
In Fig. 1: 1 base and support, 2 clamping devices, 3 annular light sources, 4 treat object plate, 5 image collecting devices, and 6 control and disposal system, 7 first air pressure nozzles, 8 second air pressure nozzles, 9 cylinders;
Fig. 2 is system illumination mode schematic diagram
Fig. 3 is lens clamping device vertical view
In Fig. 3: 21 first shell fragments, 22 second shell fragments, 23 the 3rd shell fragments, 24 the 4th shell fragments;
Fig. 4 is lens clamping device diagrammatic cross-section;
In Fig. 4: 21 first shell fragments, 22 second shell fragments, 23 the 3rd shell fragments;
Fig. 5 is graphical analysis process flow diagram;
Fig. 6 is the picture of first time shooting;
Fig. 7 is the picture of second time shooting;
Specific implementation process
Below with reference to relevant drawings, feature of the present invention is described.
Fig. 1 is the schematic diagram of a kind of pick-up unit of inventive embodiments, with reference to schematic diagram 1, the pick-up unit of the present embodiment is applicable to detection and treats object plate 4, comprising being positioned at the image collecting device 5 treating object plate 4 top, with treat the conplane annular light source 3 of object plate 4, lay respectively at the first air pressure nozzle 7 and the second air pressure nozzle 8 treating object plate 4 upper and lower sides, place the clamping device 2 of fixing len, for the first air pressure nozzle 7 and the second air pressure nozzle 8 provide compressed-air actuated cylinder 9, in order to process image collecting device 5 gather image and the control of control cylinder 9 switch and disposal system 6.
Described image collecting device 5 vertically treats object plate 4, and visual field is greater than optic diameter and field of view center overlaps with center of lens, and image collecting device pixel meets the resolution requirement to minimum dimension impurity or defect.Such as, when optic diameter is 50mm, when the minimum dimension of defect or impurity is 0.05mm, the visual field of image collecting device should be greater than 50mm, and pixel count is greater than 1000*1000.
Described annular light source 3 is made up of the annular homogenous diffusion plate of a circular base and inside thereof and multiple light emitting diode be located between circular base and circumferential dispersion plate, it is even that the light that scatter plate makes light emitting diode send becomes, and reduces the uneven impact on imaging of lumination of light emitting diode.
The lighting system of system as shown in Figure 2, describedly treat that object plate 4 is positioned at inside annular light source 3, the width W of annular light source 3 and eyeglass to be detected 4 thickness H meet: 1.1H≤W≤2H, therefore the some light that sends of annular light source 3 is through treating that the side transmission of object plate 4 enters eyeglass, some light be radiated at treat object plate 4 surface on, due to the scattering of defect and impurity, as eyeglass has defect or lens surface to have impurity, in the image of shooting, the gray-scale value of respective regions is higher than the gray-scale value of periphery background, and image appearance is bright defect and dark background.
With reference to Fig. 3 and Fig. 4, described in treat that object plate 4 is placed in clamping device 2, provide clamping force, to prevent the change under the effect of high velocity air of the position of eyeglass by the first shell fragment 21, second shell fragment 22, the 3rd shell fragment 23 and the 4th shell fragment 24.Because clamping device 2 can block the some light that annular light source 3 sends, affect image quality, for reducing impact, the degree of depth h of clamping device 2 central recess meets with the relation of the thickness H treating object plate 4: 0.2H≤h≤0.5H, to ensure that eyeglass has the illumination that can obtain abundance over half.
Described first air pressure nozzle 7 and the second air pressure nozzle 8 lay respectively at treats object plate 3 both sides, and be positioned at outside image collecting device 5 visual field and annular light source 3, to avoid impacting imaging and illumination, air pressure nozzle connects and cylinder 9 simultaneously, there is provided the pressurized air of clean dried to form high velocity air by cylinder, and containing charged gaseous ion in pressurized air, with in and the electrostatic of eyeglass, make the impurity of the absorption of lens surface more easily blow off or change position, and not easily adsorb new impurity.Air pressure nozzle and treat that angle a between object plate meets: 0 degree≤a≤20 degree, make ejection air-flow covering lens surface.
If eyeglass is comparatively large or airflow function area is less, the air-flow that single air pressure nozzle is sprayed cannot cover lens surface, can suitably increase air pressure nozzle quantity, to ensure that the high velocity air that air pressure nozzle sprays can cover lens surface.When adopting multiple air pressure nozzle, each air pressure nozzle lay out in parallel, to avoid the air-flow sprayed to influence each other, reduces gas velocity, impact effect.
The mode of operation detecting eyeglass is: first light annular light source 3, to treat that clamping device 2 put into by object plate 4, control to control with disposal system 6 after image collecting device 5 takes the first pictures of eyeglass, open cylinder 9, the high velocity air of the first air pressure spout 7, second air pressure nozzle 8 ejection can blow lens surface impurity off or change its position, then controls image collecting device 5 and takes the second pictures.Or cylinder 9 works always, make high velocity air continuous action on the surface for the treatment of object plate 3, control with disposal system 6 control image collecting device 5 take the first pictures after the compartment time take the second pictures again.
Controlling with disposal system 6 can be computing machine, by computing machine, graphical analysis is carried out to two width images, owing to treating that the position of object plate 3 is fixed, therefore before and after airflow function, the position of defect can not change, impurity can increase or disappear or change position, accordingly distinguishable go out defect and impurity judge its position.
With reference to Fig. 5, the process of graphical analysis comprises the following steps:
(501) Image semantic classification: denoising is carried out to improve the quality of image to image by medium filtering;
(502) Iamge Segmentation: split in the image background of eyeglass by the image segmentation algorithm such as threshold method or rim detection, is split the image of defect and impurity from eyeglass;
(503) feature extraction: the feature extracting defect and impurity, such as position, form etc.;
(504) defect and impurities identification: the position of the picture point of defect or impurity in comparison two width picture, and form coupling is carried out to the picture point of same position, if location identical (or close) and the point-like of homomorphosis or wire picture point in two width pictures, can judge that the same position of eyeglass exists point-like or wire defect, remaining can be judged to be point-like or wire impurity; Consider vibration and the image procossing error of system, if the distance of the picture point in two width figure is d, and homomorphosis, namely the picture point that this picture point is formed as defect is judged, there is defect in this position of eyeglass, the size of d is that the ultimate range of defect picture point movement and the maximum error of image procossing determine by twice shooting.
(505) result exports: according to the recognition result of step (504), the position of record defect or impurity and form.
Referring to Fig. 6 and Fig. 7, graphical analysis one specific embodiment processing procedure is described:
Fig. 6 and Fig. 7 is respectively the picture treating object plate 3 of first time and second time shooting, by known after image procossing, has picture point 61, picture point 62 and picture point 63 3 picture points in Fig. 6, has picture point 71, picture point 72 and picture point 73 3 picture points in Fig. 7; Extract the feature of each picture point in Fig. 6 and Fig. 7 respectively, by known for the location comparison of each picture point in two width pictures, picture point 62 in Fig. 6 is identical with picture point 71 position in Fig. 7, and the homomorphosis of two picture points, the picture point that picture point 62 and picture point 71 produce as twice shooting of same defect can be judged, and knownly treating that this position of object plate 3 exists a defect; In like manner known, picture point 63 and picture point 72 are also the picture points that twice shooting of same defect produces, and are treating that this position of object plate 3 exists a defect; There is picture point 61 in figure 6, but this position does not in the figure 7 have identical picture point and it is corresponding, known picture point 61 for treating the picture point that the impurity of object plate 3 adsorption produces, and when second time is taken, due to the effect of high velocity air, this impurity no longer origin-location; In like manner, there is picture point 73 in the figure 7, but this position does not in figure 6 have identical picture point and it is corresponding, known picture point 73 for until object plate 3 after first time pictures taken, the picture point that the impurity adsorbed in this position produces.
The above is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention illustrates as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, not departing from technical solution of the present invention, when the method and technology contents that can utilize above-mentioned explanation are done a little change or be modified to the Equivalent embodiments of equivalent variations, in every case be the content for departing from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent variations and modification, all belong in technical scheme of the present invention.
Claims (5)
1. the pick-up unit of a lens surface point-like and wire impurity, comprise the base of each parts of Supporting connectivity and support, the clamping device fixedly treating object plate, image collecting device, annular light source, air pressure nozzle and control and disposal system, it is characterized in that: described image collecting device is vertically installed in be treated above object plate; Described image collecting device visual field is greater than optic diameter and pixel meets minimum impurity resolution requirement; Described air pressure nozzle have two and more than, be placed in the upper and lower sides treating object plate respectively; Described air pressure nozzle and cylinders; Described control is connected with image collecting device with switching cylinder with disposal system; Described annular light source is looped around lens side surrounding; Described annular light source is made up of the annular homogenous diffusion plate of a circular base and inside thereof and multiple light emitting diode be located between circular base and circumferential dispersion plate, and the width W of described annular light source and lens thickness H to be detected meet: 1.1H≤W≤2H.
2. the pick-up unit of a kind of lens surface point-like according to claim 1 and wire impurity, it is characterized in that, described clamping device comprises pedestal and the clamp device of band groove, described clamp device is made up of more than three and three shell fragments, and be equally spaced between shell fragment, the degree of depth h of described groove meets with the relation of the thickness H treating object plate: 0.2H≤h≤0.5H.
3. the pick-up unit of a kind of lens surface point-like according to claim 1 and wire impurity, it is characterized in that, outside the visual field that described air pressure nozzle is placed in described image collecting device and annular light source, described air pressure nozzle and treat that the angle a between object plate meets: 0 degree≤a≤20 degree.
4. the pick-up unit of a kind of lens surface point-like according to claim 1 and wire impurity, it is characterized in that, described control and disposal system are for controlling described image acquisition device image and cylinder gas jet, described control and disposal system gather air pressure nozzle spray before the first image and air pressure nozzle spray after the second image and carry out contrast and judge whether to there is impurity, its processing procedure is:
(501) Image semantic classification: denoising is carried out to the first image and the second image by medium filtering;
(502) Iamge Segmentation: the eyeglass of the first image and the second image is split from background by threshold method or edge-detected image partitioning algorithm;
(503) feature extraction: the feature extracting defect or impurity;
(504) defect and impurities identification: the position of the picture point of defect or impurity in comparison first image and the second image, and form coupling is carried out to the picture point of same position, to be defined as defect or impurity;
(505) result exports: according to the recognition result of step (504).
5. the pick-up unit of a kind of lens surface point-like according to claim 1 and wire impurity, is characterized in that, described cylinder provides the pressurized air of clean dried to form high velocity air, and containing charged gaseous ion in pressurized air.
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| CN201310543198.3A CN103630553B (en) | 2013-11-06 | 2013-11-06 | The pick-up unit of a kind of lens surface point-like and wire impurity |
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| CN201310543198.3A CN103630553B (en) | 2013-11-06 | 2013-11-06 | The pick-up unit of a kind of lens surface point-like and wire impurity |
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| CN103630553B true CN103630553B (en) | 2016-04-06 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104614386A (en) * | 2015-02-12 | 2015-05-13 | 江苏宇迪光学股份有限公司 | Lens defects type identification method |
| CN107271453A (en) * | 2017-08-11 | 2017-10-20 | 丹阳市雷登智能科技有限公司 | The detection method and detection means of eyeglass |
| CN107966457A (en) * | 2017-11-20 | 2018-04-27 | 江苏黄金屋光学眼镜股份有限公司 | A kind of lens defects detecting system |
| CN110084084B (en) * | 2018-01-25 | 2021-04-06 | 神盾股份有限公司 | Method and electronic device for distinguishing fingerprint feature points and non-fingerprint feature points |
| CN110346119B (en) * | 2019-08-06 | 2024-07-19 | 广东工业大学 | Lens detecting system |
| CN110672638B (en) * | 2019-11-15 | 2020-07-07 | 江西特莱斯光学有限公司 | Optics-based lens surface scratch detection device |
| CN111220544A (en) * | 2020-01-19 | 2020-06-02 | 河海大学 | Lens quality detection device and detection method |
| CN111307421B (en) * | 2020-03-20 | 2022-08-19 | 宁波舜宇仪器有限公司 | Lens defect detection system |
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| CN101464419A (en) * | 2007-12-18 | 2009-06-24 | 由田新技股份有限公司 | Curve lens detection system |
| CN203117124U (en) * | 2012-11-01 | 2013-08-07 | 深圳均英电子有限公司 | Check device for optical eyeglasses |
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