CN105067639A - Device and method for automatically detecting lens defects through modulation by optical grating - Google Patents
Device and method for automatically detecting lens defects through modulation by optical grating Download PDFInfo
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- 230000007547 defect Effects 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000003287 optical effect Effects 0.000 title abstract 4
- 238000001514 detection method Methods 0.000 claims abstract description 32
- 238000002955 isolation Methods 0.000 claims abstract description 10
- 230000000877 morphologic effect Effects 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 claims description 9
- 230000011218 segmentation Effects 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 5
- 238000003384 imaging method Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 3
- 230000000007 visual effect Effects 0.000 claims description 3
- 101100117236 Drosophila melanogaster speck gene Proteins 0.000 claims description 2
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- 239000012535 impurity Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 239000000758 substrate Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 201000009310 astigmatism Diseases 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 206010020675 Hypermetropia Diseases 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 208000001491 myopia Diseases 0.000 description 1
- 208000007578 phototoxic dermatitis Diseases 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Abstract
The invention discloses a device and a method for automatically detecting lens defects through modulation by an optical grating. The device comprises an isolation detecting system, a motion control system and a light source system, wherein the isolation detecting system is arranged in a camera bellows (13); the motion control system is arranged at the bottom of the camera bellows (13) and arranged on one side of the camera bellows (13); the device is characterized in that the optical grating (6) is fixed on a linear lead screw guide rail (5), a planar backlight (10) is fixed below a to-be-detected lens (4) in parallel and connected with a light source controller (11), and a main controller (12) controls the motion control system through a motion control card (9). According to the method, lens images are sampled twice through movement of the optical grating, the lens defects are classified, positioned and measured through analysis of gray values and morphological characteristics of bright and dark field images, and lens detection accuracy and efficiency are greatly improved.
Description
Technical field
The present invention relates to a kind of eyeglass defect automatic detection device and method of Grating Modulation, refer to especially and adopt grating pair planar backlight source to modulate, and utilize machine vision technique the defect of lens surface to be carried out to the method and apparatus automatically detected.
Background technology
Eyeglass flaw inspection is not only and is ensured to dispatch from the factory the important step of Lens pass rate, is also the effective ways of monitoring industrial processes.At present, eyeglass flaw inspection still all adopts the mode of manual detection to complete, and manual detection depends on experience and the technology of testing staff to a great extent, and is subject to the impact of the factor such as subjective factor, individual difference, and false drop rate is higher.The patent No. be 201210180997.4 patent of invention propose a kind of method utilizing machine vision to detect lens defects fast, but the method really cannot divide lens surface defect type; Number of patent application be 201310086231.4 patent of invention disclose a kind of eyeglass flaw inspection system, propose employing three Machine Vision Detection stations and eyeglass defect just detected, but concrete Testing index involved by not mentioned each detection station and method; The patent No. be 201310543428.6 and 201310543198.3 patent of invention adopt machine vision method realize lens is shown that defect detects automatically, the method all adopts low angle ring light as light source, on the one hand, ring light can cause eyeglass inside and outside circle light intensity uneven, even produce aperture, and for different types of eyeglass, as near-sighted glasses, presbyopic glasses, farsighted glasses, astigmatoscope etc., due to lens index and the surface curvature property of there are differences, the consistance of successive image Processing Algorithm must be affected; On the other hand, this polishing mode requires that light source and eyeglass must be in same plane, is unfavorable for the clamping of eyeglass and fixes, affecting the real-time online detection efficiency of eyeglass.
Summary of the invention
For the deficiency that manual detection and existing research exist, the object of the present invention is to provide a kind of the defect device for fast detecting and the method that are applicable to variety classes eyeglass, for improving Detection accuracy and efficiency, for eyeglass on-line checkingi provides basis.
Technical scheme of the present invention is achieved in the following ways: a kind of eyeglass defect automatic detection device of Grating Modulation, comprise isolation detection system, kinetic control system and light-source system, isolation detection system is located in camera bellows, kinetic control system is located at the bottom of camera bellows, kinetic control system is located at the side of camera bellows, described isolation detection system is by image collecting device, camera fixed mount, eyeglass fixed mount, by object plate, grating forms, image acquiring device is arranged vertically within by above object plate by camera fixed mount, parallel gratings is installed on camera and by between object plate, described kinetic control system is made up of straight line lead screw guide rails, stepper motor, motor driver and motion control card, for the position of high-precision moving grating, light-source system is made up of planar backlight source and light source controller, it is characterized in that: described grating is fixed in straight line lead screw guide rails, planar backlight source is parallel to be fixed on and to be connected with light source controller below object plate, and master controller realizes controlling kinetic control system by motion control card.
Described camera fixed mount is used for the physical location of each hardware in fixed inspection system; Described camera bellows is used for isolation detection system and ambient light photograph, and system is in stable testing environment.
Described image acquiring device is for obtaining by the realtime graphic of object plate, and its visual field is greater than tested optic diameter and pixel resolution meets the identification requirement of defect minimum dimension.
Described described grating is for modulating imaging source, and its overall dimensions must be greater than by the maximum gauge of object plate, and the black and white strip size of space is depending on the imaging size of maximum point defect.
Described planar backlight source and light source controller are for providing the light source of vision detection system, described planar backlight source is made up of light emitting diode and high scattering diffusing panel, conforming photoenvironment is provided, its size is determined by by the full-size of object plate, described light source controller for providing stable light source power supply voltage, and regulates light-source brightness.
Described master controller is used for processing in real time the image captured by described vision acquisition device, obtains the kind of defect, position and size information.
An eyeglass defect automatic testing method for Grating Modulation, comprises the following steps:
1), adopt grating pair planar backlight source to modulate, strengthen the contrast in tested lens surface defect and intact region;
2), by straight line lead screw guide rails slide unit drive grating motion, its displacement is equal with grating fringe interval, by gathering for twice by bright, the darkfield image of all positions of object plate to tested lens image collection;
3), in testing process, do not changed by relative position between object plate and camera, according to image isotonicity principle, bright, the details in a play not acted out on stage, but told through dialogues in two gathered width images is spliced;
4), in darkfield image, gray-scale value is extracted higher than details in a play not acted out on stage, but told through dialogues fringe area by gray level threshold segmentation mode, the defect extracted mainly comprises substrate point, adds hard spot, speck, bubble, scuffing, and the unique point connected in collinear and eight neighborhood, defect point is classified by Gray and morphological feature;
5), in bright field image, gray-scale value is extracted lower than details in a play not acted out on stage, but told through dialogues fringe area by gray level threshold segmentation mode, the defect extracted mainly comprises a particle, impurity defect, and connects the unique point in collinear and eight neighborhood, and defect point is classified by Gray and morphological feature.
The present invention has the following advantages:
(1) adopt machine vision technique to carry out automatically detecting fast, locating and classification to eyeglass defect, effectively can improve the efficiency of eyeglass Quality Detection;
(2) adopt planar base backlight to provide high evenness photoenvironment, and modulate in conjunction with grating pair backlight, build bright, inner room every visual field, in defect, part defect has astigmatism, under details in a play not acted out on stage, but told through dialogues background, have shinny feature; In defect, part defect has resistance photosensitiveness, has obfuscation feature under light field background, and this polishing mode effectively can adapt to the detection of different classes of eyeglass;
(3) combined with image acquisition by the motion of straight line lead screw guide rails slide unit, gather two width lens image, can, darkfield image bright to eyeglass splice based on image isotonicity principle, the panoramic picture of acquisition eyeglass under bright, details in a play not acted out on stage, but told through dialogues;
(4) bright, darkfield image are processed, synchronous detection can be realized to the defect with resistance light and astigmatism characteristic, realize automatic identification to eyeglass defect and classification in conjunction with half-tone information and shape information.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is the topology view of pick-up unit of the present invention;
Fig. 2 is overhaul flow chart of the present invention;
Fig. 3 is defect shooting effect figure.
In figure: 1 image collecting device; 2 camera fixed mounts; 3 eyeglass fixed mounts; 4 by object plate; 5 straight line lead screw guide rails; 6 gratings; 7 stepper motors; 8 motor drivers; 9 motion control cards; 10 planar backlight sources; 11 light source controllers; 12 master controllers; 13 camera bellows.
Embodiment
Detailed technology scheme of the present invention is introduced: as shown in Figure 1 below in conjunction with accompanying drawing, a kind of eyeglass defect automatic detection device of Grating Modulation, comprise image collecting device 1, camera fixed mount 2, eyeglass fixed mount 3, by object plate 4, straight line lead screw guide rails 5, grating 6, stepper motor 7, motor driver 8, motion control card 9, planar backlight source 10, light source controller 11, master controller 12, camera bellows 13 and image acquisition, image collecting device 1 is vertically fixed on device top by camera fixed mount 2, and be connected with master controller 12 by USB3.0 interface, image collecting device 1 with by object plate 4, the center line in the peaceful slick and sly source 10 of grating 6 is on same vertical plane, be fixed between image collecting device 1 and grating 6 by object plate 4 by eyeglass fixed mount 5 is parallel, grating 6 is parallel to be fixed in straight line lead screw guide rails 5, its position is by between object plate 4 and planar backlight source 10, with stepper motor 7 for gearing, be connected with master controller 12 with motion control card 9 by motor driver 8, realize the function of image light and shade field reverse shot, planar backlight source 10 is fixed on device bottom, and regulates its intensity of illumination by light source controller 11.
As shown in Figure 2, be testing process of the present invention, its concrete implementation step is as follows:
1, detection station is fixed to by object plate 4;
2, image collecting device 1 controls acquisition first width lens image by master controller 12;
3, master controller 12 controls straight line lead screw guide rails 5 by motion control card 9 and drives grating 6 to move the black and white strip size of space;
4, image collecting device 1 obtains the second width lens image by master controller 12;
5, bright, the details in a play not acted out on stage, but told through dialogues region in two width images is extracted respectively by Threshold segmentation mode, and according to image isotonicity principle by image mosaic Cheng Ming, darkfield image;
6, extracted the high gray-scale value region in darkfield image by Threshold segmentation mode, extract the low gray areas in bright field image, and be connected by neighborhood point and repair defect region with Morphological scale-space method;
7, the comprehensively gray-scale value of defect and morphological feature in bright, dark image, comprehensively analyzes defect type, position and size, judges by object plate grade.
As shown in Figure 3, be defect shooting effect figure.
Claims (7)
1. the eyeglass defect automatic detection device of a Grating Modulation, comprise isolation detection system, kinetic control system and light-source system, it is inner that isolation detection system is located at camera bellows (13), kinetic control system is located at the bottom of camera bellows (13), kinetic control system is located at the side of camera bellows (13), described isolation detection system is by image collecting device (1), camera fixed mount (2), eyeglass fixed mount (3), by object plate (4), grating (6) forms, image acquiring device (1) is arranged vertically within by object plate (4) top by camera fixed mount (2), grating (6) is parallel is installed on camera and by between object plate (4), described kinetic control system is made up of, for the position of high-precision moving grating (6) straight line lead screw guide rails (5), stepper motor (7), motor driver (8) and motion control card (9), light-source system is made up of planar backlight source (10) and light source controller (11), it is characterized in that: described grating (6) is fixed in straight line lead screw guide rails (5), planar backlight source (10) is parallel to be fixed on by object plate (4) below and to be connected with light source controller (11), and master controller (12) realizes controlling kinetic control system by motion control card (9).
2. the eyeglass defect automatic detection device of a kind of Grating Modulation according to claim 1, is characterized in that: described camera fixed mount (2) is for the physical location of hardware each in fixed inspection system; Described camera bellows (13), for isolation detection system and ambient light photograph, makes system be in stable testing environment.
3. the eyeglass defect automatic detection device of a kind of Grating Modulation according to claim 1, it is characterized in that: described image acquiring device (1) is for obtaining by the realtime graphic of object plate (4), and its visual field is greater than by object plate (4) diameter and pixel resolution meets the identification requirement of defect minimum dimension.
4. the eyeglass defect automatic detection device of a kind of Grating Modulation according to claim 1, it is characterized in that: described described grating (6) is for modulating imaging source, its overall dimensions must be greater than by the maximum gauge of object plate (4), and the black and white strip size of space is depending on the imaging size of maximum point defect.
5. the eyeglass defect automatic detection device of a kind of Grating Modulation according to claim 1, it is characterized in that: described planar backlight source (10) and light source controller (11) are for providing the light source of vision detection system, described planar backlight source (10) is made up of light emitting diode and high scattering diffusing panel, conforming photoenvironment is provided, its size is determined by by the full-size of object plate (4), described light source controller (11) for providing stable light source power supply voltage, and regulates light-source brightness.
6. the eyeglass defect automatic detection device of a kind of Grating Modulation according to claim 1, it is characterized in that: described master controller (12), for processing in real time the image captured by described vision acquisition device, obtains the kind of defect, position and size information.
7. an eyeglass defect automatic testing method for Grating Modulation according to claim 1, is characterized in that: comprise the following steps:
1), adopt grating pair planar backlight source to modulate, strengthen the contrast in tested lens surface defect and intact region;
2), by straight line lead screw guide rails slide unit drive grating motion, its displacement is equal with grating fringe interval, by gathering for twice by bright, the darkfield image of all positions of object plate to tested lens image collection;
3), in testing process, do not changed by relative position between object plate and camera, according to image isotonicity principle, bright, the details in a play not acted out on stage, but told through dialogues in two gathered width images is spliced;
4), in darkfield image, gray-scale value is extracted higher than details in a play not acted out on stage, but told through dialogues fringe area by gray level threshold segmentation mode, the defect extracted mainly comprises substrate point, adds hard spot, speck, bubble, scuffing, and the unique point connected in collinear and eight neighborhood, defect point is classified by Gray and morphological feature;
5), in bright field image, gray-scale value is extracted lower than details in a play not acted out on stage, but told through dialogues fringe area by gray level threshold segmentation mode, the defect extracted mainly comprises a particle, impurity defect, and connects the unique point in collinear and eight neighborhood, and defect point is classified by Gray and morphological feature.
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| CN107026096A (en) * | 2016-02-01 | 2017-08-08 | 易发精机股份有限公司 | Crystal round fringes measure module |
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