CN106990119A - The vision detection system and detection method of a kind of white glass surface defect of automatic detection - Google Patents
The vision detection system and detection method of a kind of white glass surface defect of automatic detection Download PDFInfo
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- CN106990119A CN106990119A CN201710284934.6A CN201710284934A CN106990119A CN 106990119 A CN106990119 A CN 106990119A CN 201710284934 A CN201710284934 A CN 201710284934A CN 106990119 A CN106990119 A CN 106990119A
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- light source
- white glass
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- camera
- detection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
Abstract
A kind of vision detection system of the white glass surface defect of automatic detection, including four sub-devices such as light supply apparatus, micro-vision device, accurate conveyer, control host computer, wherein, light supply apparatus at least includes light source；Micro-vision system at least includes camera and camera lens；Accurate conveyer at least includes carrying roller transfer structure, motor-driven structure, it is characterised in that：Detecting system camera connection lens from top to bottom, camera and camera lens are located at the normal position of light source, there is a light source box body outside light source, there is the image that a light source gap allows camera to gather the white glass piece passed through below light source box body on box body, light source box body fit beneath has carrying roller transfer structure, for transmitting white glass piece, when white glass piece is sent to light source gap just to position by carrying roller, start to gather image, from white glass piece while when passing through immediately below light source gap, just image is gathered by camera line by line, when whole white glass piece by after complete all IMAQs.
Description
Technical field
The application is related to the vision detection system and detection method of a kind of white glass surface defect of automatic detection, belongs to robot
Vision measurement and the defect detecting technique field in control field.
Background technology
There are problems in white glass surface detection apparatus of the prior art：
The white glass mode of traditional bright field detection either can not be all met in defects detection classification or defects detection precision
Demand, the tiny flaw that dark field detection can not all be accurately identified for naked eyes can play good Detection results.
Quite a few dark-field examination device needs fixture when designing, fixture can be disturbed to white glass imaging belt, can give glass
Glass causes scar, and the use of fixture can also sacrifice the area of detection of glass, cause to have a strong impact on picture quality；
Also some devices are imaged using light reflection structure, due to that can cause light loss using light reflecting board or light reflection mirror,
Segmental defect on the white glass of mobile phone is imaged unintelligible or is not imaged, it is impossible to obtain high-quality white glass surface defect image,
It also add unnecessary cost simultaneously.
In addition, the installation site of light source and selection are also sufficiently reflected to imaging effect.
Traditional detection transfer structure enables to detection means to realize the production automation, but detection speed and detection are smart
The need for degree can not but meet automated production, high-quality detection picture can be obtained on the basis of high speed detection by how realizing
And ensure accuracy of identification, it is urgent problem to be solved on production line.
The content of the invention
In order to solve above-mentioned technical problem of the prior art, the application, which provides one kind, can obtain high-quality automatic inspection
The vision detection system of white glass surface defect is surveyed, the automatic detection of white glass can either be realized, high-quality white glass can be obtained again
Surface defect image.
According to the one side of the application there is provided a kind of vision detection system of the white glass surface defect of automatic detection, including
Four sub-devices such as light supply apparatus, micro-vision device, accurate conveyer, control host computer.Wherein, light supply apparatus is at least wrapped
Light source is included, light source controller and light source pose calibrating device can also be included；Micro-vision system at least includes camera and camera lens,
Visual gesture adjusting apparatus can also be included；Accurate conveyer at least includes carrying roller transfer structure, motor-driven structure；Control
Host computer can be using traditional computer, industrial computer and programmable controller.
Specifically, in the normal position fixed camera of light source, the connection lens below camera.There is a light source outside light source
Box body, to ensure the seal of light source.On box body there is a light source gap to allow camera to be gathered by camera lens below light source box body
Image.Light source box body is supported by light source bracket, and carrying roller transfer structure is equipped with below, (complete for transmitting white glass piece
In text also referred to as " white glass "), when white glass piece is sent to light source gap just to position by carrying roller, it can be sensed by triggering
Device triggering starts to gather image, from white glass piece while when passing through immediately below light source gap, just gathering image frame by frame by camera, when
Whole white glass piece completes all IMAQs by rear.
In this application, carrying roller is forwarded white glass roller using roller, there is one intersegmental between each two roller
Gap, the center of camera is against the gap between certain two roller.Carrying roller not only serves the effect of transmission, positioned at light source seam
Carrying roller gap immediately below gap, also acts the effect of abundant printing opacity, light is not produced on white glass piece unwanted
Reflection, obtains the imaging of high-resolution, and such a printing opacity scheme also realizes the unique technology scheme of high-definition image for the application.Gathered
Have in journey to carrying roller gap and be strict with, it is necessary to make the center of camera against the gap between its lower two roller.Due to line
Array camera is line scanning collection image, and the actual physical size of collection a line is 10 microns every time, therefore when gap is much larger than
At 10 microns, roller would not be appeared in the visual field of camera, can eliminate the interference of roller dialogue glass IMAQ.
Light source device for adjusting posture in light supply apparatus is used to adjust light source position, with the lifting free degree, while can be small
In the range of adjust pitching.Light source bracket is used for fixed light source structure.The position of selection and the illumination of light source type is for imaging
Effect is most important.For abundant prominent defect characteristic, the contrast of defect in image is lifted, the application have selected multi-angle line
Light source.The working face of multi-angle line source has converged the light of multiple angles, and the intensity of light source is up to 700Klux, and light source
Brightness can be adjusted by light source controller, dynamic and software of saying good-bye controls both of which, can meet detecting system strong to light source
The requirement of degree.Multi-angle line source light emission direction foot, the uniform illumination that each position is obtained, the measured object surface that camera is collected
Uniformly, details is clear, and contrast is high, no speck and dazzle.
Connection lens below camera in micro-vision device, gather white glass surface image.The application uses line-scan digital camera,
Light source gap and carrying roller gap can be preferably coordinated to collect high-resolution high quality graphic.Visual gesture adjusting apparatus includes three
The individual free degree, including lifting, left and right, front and rear three degree of freedom can need according to collection image and adjust camera and camera lens
Position.
In accurate conveyer, white glass is transmitted using the idler structure of hollow out, it is not necessary to which fixture dialogue glass is clamped, no
There is interference of the fixture to image, it also avoid the loss for the detection part that fixture is caused, thus obtain it is high-quality, without detection lose
Lose the white glass surface image at position.Motor-driven structure is used for adjusting carrier roller transfer rate；Roller rack is used to support fixed support
Roller transport mechanism.
According to the application another aspect there is provided the detection means of white glass surface defect image use it is a kind of polygonal
Spend line source, including one group of LED chip and one group of off-axis reflective mirror monomer composition by one or more different curvature radius
Reflective mirror, the light that the off-axis reflective mirror monomer of one or more different curvature radius can send each LED chip is independent
A focus is focused on, by the light focusing sent with reflective mirror monomer apart from the LED chip of one array of identical to each
Individual focus formation linear light.
According to the another aspect of the application, there is provided a kind of the white of the detection means of the white glass surface defect image of use the application
Glass detection method of surface flaw, surface defect method includes the detection to surface tear defect and surface chipping defect, specifically such as
Under：
For the detection of white glass surface tear, following steps are broadly divided into：
Step one：The white glass surface image of collection is pre-processed.
In this step, binaryzation is carried out to image first with fixed threshold, then, searches the circumference of image,
Original image is cut finally according to the profile found, the data in profile are only preserved, to improve image processing speed.
Step 2：The candidate defect on white glass surface is detected, the feature of defect is calculated.
In this step, the multidimensional characteristic of defect is calculated, the length of defect is calculated first with the minimum enclosed rectangle of defect
Wide ratio, area, width etc., then, according to the linearity of the distance of TP and minimum enclosed rectangle calculating defect and smoothly
Degree etc., finally, the characteristic vector of defect is made up of these features.
Step 3：The defect characteristic vector obtained according to calculating, is classified and is recognized to candidate defect, by cut, rubbed
Wound, dust, fiber are classified, and are recognized the cut in defect and rubbed wound, and non-defective dust and fiber；
Step 4：The fusion process of interrupted defect is realized using different convergence strategies for different defects, so as to have
The detecting of effect and rubs wound at the cut on white glass surface.
In this step, can when being merged to cut, it is considered to the factor such as distance, direction, width between different cuts
The cut of a plurality of interruption is permeated the complete cut of bar.To rub hinder merge when, it is considered to difference is rubbed between wound or rubs wound
The factors such as distance, direction with cut, multi-disc can be separated rub wound or it is unconnected rub wound linked together with cut.At this
In step, interrupted defect is merged using different convergence strategies, the accurate measurement of the size of defect is realized.
According to last aspect of the application, the detection means and method of above-mentioned white glass surface defect image, and glass table
A kind of multi-angle line source that the detection means of planar defect image is used can also be used to hand-set lid detection and the white glass of mobile phone
Detection.
The detection means and method for the white glass surface defect image that the application is used disclosure satisfy that the extensive of the white glass of factory
Detect that the high speed under environment needs and high accuracy needs.
Brief description of the drawings
The white glass surface defect detection apparatus of Fig. 1 (mobile phone).
Fig. 2 is the profile of the embodiment of the structure of multi-angle light source.
Reference：1, line-scan digital camera in Fig. 1,2, camera lens, 3, multi-angle light source, 4, light source gap, 5, light source bracket, 6,
Photoelectric sensor, 7, carrying roller transfer structure, 8, roller rack, 9, servomotor, 10, chassis overhang, 20, LED chip, 41-49
Reflective mirror monomer, 40, focus
Embodiment
The technical scheme of the application is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1, a kind of vision detection system of the white glass surface defect of automatic detection, including light supply apparatus, micro-vision
Four sub-devices such as device, accurate conveyer, control host computer.Wherein, light-source system at least includes light source, may also include light
Source controller and light source pose calibrating device；Micro-vision system at least includes camera, camera lens, may also include visual gesture adjustment
Device；Accurate conveyer at least includes carrying roller transfer structure, motor-driven structure；Control host computer can using traditional computer,
Industrial computer and programmable controller.
Camera connection lens, have on a light source box body, box body outside the normal position of light source, light source from top to bottom
Camera is allowed to gather the image below light source box body by camera lens with a light source gap, light source box body fit beneath has carrying roller biography
Send and carrying roller gap is faced immediately below structure, light source gap, carrying roller transfer structure is used to transmit white glass piece, when white glass piece is logical
When crossing carrying roller and being sent at light source gap, start to gather image by trigger sensor triggering, from white glass piece by light source seam
When immediately below gap, image is just gathered by camera frame by frame, when whole white glass piece by after complete all IMAQs.
Embodiment 2, as shown in figure 1, the connection lens of line-scan digital camera 1 are used from top to bottom, positioned at the vertical of multi-angle light source 3
Having outside surface, multi-angle light source 3 on a light source box body, box body, there is a light source gap 4 to allow line-scan digital camera 1 to pass through camera lens
The image below light source box body is gathered, light source box body fit beneath has faces support immediately below carrying roller transfer structure, light source gap 4
Roller gap, carrying roller transfer structure is used to transmit white glass piece, when white glass piece while being sent to by carrying roller 74 at light source gap
When, by photoelectric sensor 6 triggering start gather image, from white glass piece pass through 4 underface of light source gap when, just by camera by
Frame gathers image, when whole white glass piece by after complete all IMAQs.
Embodiment 3, the profile of multi-angle light source embodiment structure as shown in Figure 2, the white glass surface of automatic detection lacks
A kind of multi-angle line source that sunken vision detection system is used, including one group of LED chip 20 and one group by it is one or more not
With radius of curvature off-axis reflective mirror monomer 41-49 constitute reflective mirror, wherein, one group of LED chip 20 with vertical paper z-axis to
Arrangement, reflective mirror monomer 41-49 is only that (actual conditions can also be adopted for the example of the off-axis reflective mirror monomer of 9 different curvature radius
With the off-axis reflective mirror of one or more different curvature radius), the off-axis reflective mirror monomer energy of one or more different curvature radius
The enough light for sending each LED chip 20 individually focuses on focus 40, will be with reflective mirror monomer apart from one group of LED20 of identical
Linear light of the light focusing that chip is sent to the formation of each focus along z-axis, take y-axis as symmetrical, also another set LED chip
20 and reflective mirror (the actual feelings that are made up of the off-axis reflective mirror monomer 41-49 of one or more different curvature radius of another set
Condition can also use the off-axis reflective mirror of one or more different curvature radius, be symmetrical arranged with one group of reflective mirror monomer on y-axis),
Thus, it is the linear light along z-axis that focus 40 is brought together by multi-angle light focusing.
A kind of embodiment 4, white glass surface of the vision detection system of the white glass surface defect of use the application automatic detection lacks
Detection method is fallen into, surface defect method includes the detection to surface tear defect and surface chipping defect, specific as follows：
For the detection of white glass surface tear, following four step is broadly divided into：
Step one：The white glass surface image of collection is pre-processed.
In this step, binaryzation is carried out to image first with fixed threshold, then, searches the circumference of image,
Original image is cut finally according to the profile found, the data in profile are only preserved, to improve image processing speed.
Step 2：The candidate defect on white glass surface is detected, the feature of defect is calculated.
In this step, the multidimensional characteristic of defect is calculated, the length of defect is calculated first with the minimum enclosed rectangle of defect
Wide ratio, area, width etc., then, according to the linearity of the distance of TP and minimum enclosed rectangle calculating defect and smoothly
Degree etc., finally, the characteristic vector of defect is made up of these features.
Step 3：The defect characteristic vector obtained according to calculating, is classified and is recognized to candidate defect, by cut, rubbed
Wound, dust, fiber are classified, and are recognized the cut in defect and rubbed wound, and non-defective dust and fiber；
Step 4：The fusion process of interrupted defect is realized using different convergence strategies for different defects, so as to have
The detecting of effect and rubs wound at the cut on white glass surface.
In this step, can when being merged to cut, it is considered to the factor such as distance, direction, width between different cuts
The cut of a plurality of interruption is permeated the complete cut of bar.To rub hinder merge when, it is considered to difference is rubbed between wound or rubs wound
The factors such as distance, direction with cut, multi-disc can be separated rub wound or it is unconnected rub wound linked together with cut.At this
In step, interrupted defect is merged using different convergence strategies, the accurate measurement of the size of defect is realized.
The chipping defect on dialogue glass surface, is broadly divided into three below step：
Step one：Cut out white glass surface region；
Step 2：The edge and width of the method dialogue glass scanned using fixed step size line are accurately positioned and measured；
Step 3：By judging occurring continuous abnormal width in border width set, chipping is positioned
With measurement.
Embodiment 5,
The vision detection system for the white glass surface defect of automatic detection that the application is related to and corresponding white glass surface defect inspection
Survey method, and a kind of multi-angle line source for using of vision detection system of the white glass surface defect of automatic detection can also be used to
Hand-set lid is detected and the white glass detection of mobile phone.
The beneficial effect that technical scheme is brought has：Realize high-speed automated detection, picture quality on production line
Good, accuracy of detection is high.
The herein described embodiment being not limited to described in embodiment, as long as those skilled in the art are according to this
Application scheme draws other embodiments, also belongs to the scope of technological innovation and the protection of the application.
Claims (10)
1. a kind of vision detection system of the white glass surface defect of automatic detection, including light supply apparatus, micro-vision device, accurate biography
Four sub-devices such as device, control host computer are sent, wherein, light supply apparatus at least includes light source；Micro-vision system at least includes
Camera and camera lens；Accurate conveyer at least includes carrying roller transfer structure, motor-driven structure, it is characterised in that：Detecting system
Camera connection lens from top to bottom, camera and camera lens, which are located at outside the normal position of light source, light source, has a light source box body, box body
It is upper to allow the image that camera gathers the white glass piece passed through below light source box body, light source box body fit beneath with a light source gap
There is carrying roller transfer structure, for transmitting white glass piece, when white glass piece is sent to light source gap just to position by carrying roller, open
Begin collection image, from white glass piece while when passing through immediately below light source gap, just gathering image line by line by camera, when whole white glass
Glass piece completes all IMAQs by rear.
2. detecting system as claimed in claim 1, the light supply apparatus can also include light source controller and light source posture school
Standard apparatus.
3. detecting system as claimed in claim 1, the micro-vision system can also include visual gesture adjusting apparatus.
4. detecting system as claimed in claim 1, when white glass piece is sent to light source gap just to position by carrying roller, leads to
Photoelectric sensor triggering is crossed, starts to gather image.
5. detecting system as claimed in claim 1, positioned at Founder under camera to having carrying roller gap at light source gap.
6. the detecting system as described in claim 1 to 5 is any, the camera is line-scan digital camera, the light source is multi-angle line
Light source.
7. a kind of multi-angle line source for detecting system described in any of the above-described claim, including two groups on y-axis pair
The LED chip group of title and two groups are on the symmetrical off-axis reflective mirror monomer composition by one or more different curvature radius of y-axis
Reflective mirror, the light list that the off-axis reflective mirror monomers of one or more different curvature radius can send each LED chip
A focus solely is focused on, the light focusing that will be sent from different reflective mirror monomers apart from the LED chip of one array of identical
To corresponding each focus formation linear light.
8. the white glass detection method of surface flaw of detecting system, table described in a kind of use claim 1-6 any claims
Planar defect method includes the detection to surface tear defect and surface chipping defect, specific as follows：
For the detection of white glass surface tear, following four step is broadly divided into：
Step one：The white glass surface image of collection is pre-processed.
Step 2：The candidate defect on white glass surface is detected, the feature of defect is calculated.
Step 3：The defect characteristic vector obtained according to calculating, is classified and is recognized to candidate defect, by cut, rubs wound, ash
Dirt, fiber are classified, and are recognized the cut in defect and rubbed wound, and non-defective dust and fiber；
Step 4：The fusion process of interrupted defect is realized using different convergence strategies for different defects, so that effectively
Detect the cut on white glass surface and rub wound.
The chipping defect on dialogue glass surface, is broadly divided into three below step：
Step one：Cut out white glass surface region；
Step 2：The edge and width of the method dialogue glass scanned using fixed step size line are accurately positioned and measured；
Step 3：By judging occurring continuous abnormal width in border width set, chipping is positioned and surveyed
Amount.
9. the detecting system as described in above-mentioned claim 1-6 any claims can be used in hand-set lid detection and hand
The white glass detection of machine.
10. the multi-angle line source of detecting system or as claimed in claim 8 white glass surface defect as recited in claim 7
Detection method can be used in hand-set lid detection and the white glass detection of mobile phone.
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