CN110018166A - A kind of device and method for product appearance defect detection - Google Patents
A kind of device and method for product appearance defect detection Download PDFInfo
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- CN110018166A CN110018166A CN201910209818.7A CN201910209818A CN110018166A CN 110018166 A CN110018166 A CN 110018166A CN 201910209818 A CN201910209818 A CN 201910209818A CN 110018166 A CN110018166 A CN 110018166A
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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
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/029—Location-based management or tracking services
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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
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
- G01N2021/8887—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges based on image processing techniques
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- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
The invention discloses a kind of device and method for product appearance defect detection, and wherein equipment includes light source, flies to clap driving device and filming apparatus.Fly to clap the movement that driving device drives light source synchronous with filming apparatus according to preset motion track, or for driving product to be measured mobile according to preset motion track；Multiple shooting points are wherein provided on motion track, shooting point is corresponding with preset exposure value or yield value；When filming apparatus is moved to shooting point, or when product to be measured is moved to shooting point, filming apparatus shoots product to be measured according to the corresponding exposure value of shooting point or yield value, obtains the image of product to be measured.Due to material and the difference of causes of defects, for the contrast for increasing defect imaging, the pre-set exposure value of same shooting point or yield value may have multiple, therefore multiple images with different brightness can be obtained, be conducive to the detection of the defects of image, the accuracy of detection is improved, the efficiency of detection is also just improved.
Description
Technical field
The present invention relates to the fields of manufacturing, and in particular to a kind of device and method for product appearance defect detection.
Background technique
With the fast development of electronic communication industry, the demand of FPC (flexible printed circuit board) open defect detection is increasingly
Increase.The open defect of FPC detects usually by manually being detected, low efficiency；Also occur taking pictures to FPC and then using figure
The mode detected as processing technique, but this mode omission factor detected automatically is high, and detection efficiency is equally to be improved.
Summary of the invention
The present invention is intended to provide a kind of device and method for product appearance defect detection, to improve product appearance defect
The efficiency of detection.
According to a first aspect of the present application, this application provides a kind of equipment for product appearance defect detection, comprising:
Light source, for irradiating product to be measured；
Fly to clap driving device, the movement for driving light source synchronous with filming apparatus according to preset motion track, or
For driving product to be measured mobile according to preset motion track；Multiple shooting points are provided on the motion track, it is described
It is corresponding with preset exposure value or yield value to shoot point；
Filming apparatus, for being moved to shooting point when itself being moved to shooting point, or in the product to be measured
When, product to be measured is shot according to the corresponding exposure value of shooting point or yield value, obtains the image of product to be measured.
It further include image processing module in the equipment for product appearance defect detection, for described to be measured
The image of product is handled to analyze product to be measured with the presence or absence of defect.
In the equipment for product appearance defect detection, the point that shoots is according to the arrangement and bat of product to be measured
It takes the photograph depending on the visual field of device.
In the equipment for product appearance defect detection, the exposure value or yield value are according to corresponding shooting point
Can at least one of material, causes of defects and defect characteristic of product area to be measured of shooting determine.
In the equipment for product appearance defect detection, the light source is stroboscopic light source.
In the equipment for product appearance defect detection, filming apparatus is at the uniform velocity relative to the movement of product to be measured
It is mobile, wherein the speed at the uniform velocity moved is less than the value that Pixel Dimensions are obtained divided by the time for exposure that filming apparatus is shot.
In the equipment for product appearance defect detection, filming apparatus is at the uniform velocity relative to the movement of product to be measured
It is mobile, wherein time for exposure when filming apparatus is shot is less than three times theoretical maximum without the smear time for exposure；The theoretical nothing is dragged
Shadow maximum exposure time is the time needed for passing through a pixel with the speed at the uniform velocity moved.
In the equipment for product appearance defect detection, identical exposure value or the corresponding shooting point of yield value exist
It is adjacent on the motion track.
In the equipment for product appearance defect detection, a shooting point corresponds at least one preset exposure
Value or yield value；To each exposure value or yield value, filming apparatus at least shoots the image of a product to be measured.
According to a second aspect of the present application, the product appearance defect detection based on above equipment that this application provides a kind of
Method includes the following steps:
According to the movement that preset motion track drives light source synchronous with filming apparatus, or according to preset motion track
Drive product to be measured mobile；Multiple shooting points, the shooting point and preset exposure value are provided on the motion track
Or yield value is corresponding；
When itself being moved to shooting point, or when the product to be measured is moved to shooting point, according to the shooting
The corresponding exposure value of point or yield value shoot product to be measured, obtain the image of product to be measured.
The beneficial effects of the present invention are:
The present invention provide it is a kind of for product appearance defect detection device and method, wherein the equipment include light source,
Fly to clap driving device and filming apparatus.Fly bat driving device and drives light source synchronous with filming apparatus according to preset motion track
It is mobile, or for driving product to be measured mobile according to preset motion track；Multiple shootings are wherein provided on motion track
Point, shooting point are corresponding with preset exposure value or yield value；When filming apparatus is moved to shooting point, or to be measured
When product is moved to shooting point, filming apparatus shoots product to be measured according to the corresponding exposure value of shooting point or yield value,
Obtain the image of product to be measured.Since exposure value or yield value are preset according to shooting point, therefore obtained image is according to bat
It takes the photograph the difference of point and there is different brightness, consequently facilitating judging whether from image defective, improve the accurate of detection
Property, also just improve the efficiency of detection.
Detailed description of the invention
Fig. 1 is the structural block diagram of one embodiment of equipment detected provided by the present invention for product appearance defect；
Fig. 2 is the schematic diagram of filming apparatus and light source in the equipment detected provided by the present invention for product appearance defect；
Fig. 3 is the structural block diagram of another embodiment of equipment detected provided by the present invention for product appearance defect；
Fig. 4 is the schematic diagram of motion track in the equipment detected provided by the present invention for product appearance defect；
Fig. 5 is the flow chart of one embodiment of method of product appearance defect provided by the invention detection.
Specific embodiment
Below by specific embodiment combination attached drawing, invention is further described in detail.Wherein different embodiments
Middle similar component uses associated similar element numbers.In the following embodiments, many datail descriptions be in order to
The application is better understood.However, those skilled in the art can recognize without lifting an eyebrow, part of feature
It is dispensed, or can be substituted by other elements, material, method in varied situations.In some cases, this Shen
Please it is relevant it is some operation there is no in the description show or describe, this is the core in order to avoid the application by mistake
More descriptions are flooded, and to those skilled in the art, these relevant operations, which are described in detail, not to be necessary, they
Relevant operation can be completely understood according to the general technology knowledge of description and this field in specification.
It is formed respectively in addition, feature described in this description, operation or feature can combine in any suitable way
Kind embodiment.Meanwhile each step in method description or movement can also can be aobvious and easy according to those skilled in the art institute
The mode carry out sequence exchange or adjustment seen.Therefore, the various sequences in the description and the appended drawings are intended merely to clearly describe a certain
A embodiment is not meant to be necessary sequence, and wherein some sequentially must comply with unless otherwise indicated.
As depicted in figs. 1 and 2, this application provides a kind of equipment for product appearance defect detection, comprising: flies to clap and drive
Dynamic device 10, controller 20, light source 30, filming apparatus 40 and image processing module 50.Fly bat driving device 10 and passes through controller
20 connection light sources 30 and filming apparatus 40, filming apparatus 40 are connect with image processing module 50.
Light source 30 is for irradiating product to be measured, such as from front illuminated product to be measured, from side door irradiation product to be measured, from front
Product to be measured etc. is irradiated with side.In the present embodiment, light source 30 is from front illuminated product to be measured.
Fly to clap the movement that driving device 10 is used to drive light source 30 synchronous with filming apparatus 40 according to preset motion track,
Or for driving product to be measured mobile according to preset motion track.This can be there are three types of move mode, and one is light sources 30
The movement synchronous with filming apparatus 40, product to be measured do not move；Another kind is that light source 30 and filming apparatus 40 do not move, production to be measured
Product are mobile；Movement also synchronous with filming apparatus 40 one is light source 30, product to be measured also move.No matter using which kind of mode,
Its purpose is for the image for allowing filming apparatus 40 that can shoot product different zones to be measured, in the multiple productions to be measured of one-time detection
When product, also in order to allow filming apparatus 40 that can shoot the image of each product different zones to be measured.Further, filming apparatus 40
Movement relative to product to be measured is at the uniform velocity to move, that is, using product to be measured as object of reference, the movement speed of filming apparatus 40 is permanent
It is fixed.Multiple shooting points are provided on motion track, shooting point is corresponding with preset exposure value or yield value.Shoot point just
It is the camera site of filming apparatus 40.
Filming apparatus 40 is used for when itself being moved to shooting point, or when product to be measured is moved to shooting point,
Product to be measured is shot according to the corresponding exposure value of shooting point or yield value, obtains the image of product to be measured.
Image processing module 50 analyzes product to be measured for being handled the image of product to be measured with the presence or absence of defect
And the type of defect.Image processing module 50 carries out processing analysis using conventional means, and the present invention does not repeat them here.
As it can be seen that since exposure value or yield value are preset according to shooting point, therefore the image root that filming apparatus 40 is shot
There is different brightness according to the difference of shooting point, brightness of image difference is conducive to image processing module 50 and judges different type
Defect also just improve the efficiency of detection to improve the accuracy of detection.
In the present embodiment, light source 30 includes stroboscopic light source, it is preferred that stroboscopic light source is stroboscopic coaxial light source.Such as Fig. 2 institute
Show, A is product to be measured, and stroboscopic coaxial light source includes semi-transparent semi-reflecting lens 311 and luminescent device (such as lamp bead) 312, optical path such as Fig. 2 arrow
Shown in head.Stroboscopic light source is that have the principle of super brightness come work using the transient pulse of lamp bead 312, that is, transient pulse
Lamp bead 312 is set to issue the light of super brightness, the light issued is higher than the brightness that ordinary light source issues.The mirror of filming apparatus 40
Head is located at the surface of semi-transparent semi-reflecting lens 311, is arranged so that the light of light source 30 after product A to be measured reflection, passes through semi-transparent
Semi-reflective mirror 311 enters the camera lens of filming apparatus 40, so as to get the image of product A to be measured.The image of product A to be measured can
To be being also possible to dynamically for static state, in the present embodiment, the image of product A to be measured is the photo (static state) of product A to be measured.
The present embodiment is illustrated so that product A to be measured is FPC (flexible printed circuit board) as an example.Usual multiple FPC pass through
Support plate is transported at each step together, therefore, can once be examined provided by the present invention for the equipment of product appearance defect detection
Survey multiple FPC.The equipment further includes power, transmission mechanism and fixed mechanism.Fixed mechanism is used to fill light source 30 and shooting
It sets 40 to be fixed together, such as the present embodiment is fixed using bracket.It is dynamic that the offer of the conventional means such as stepper motor can be used in power
Power.Transmission mechanism is used for transmission power to drive filming apparatus 40 and light source 30 mobile, i.e., the present embodiment with filming apparatus 40 with
It is illustrated for 30 synchronizing moving of light source.Power and transmission mechanism cooperation energy driving arm move in a plane, such as adopt
It is mobile in X-direction with a motor and a transmission mechanism cooperation driving arm, using another motor and another transmission
Mechanism cooperates driving arm mobile in Y direction, moves so as to realize bracket in XOY plane along preset motion track.
Bracket, light source 30 and filming apparatus 40 etc. are located above support plate.
As shown in figure 3, the equipment further includes controller 20 and host computer 60 in the present embodiment.Fly to clap driving device 10
Including servo-driver 110 and motion control card 120.Servo-driver 110 connects motor, for controlling motor, reads in real time
The location information of filming apparatus 40 and light source 30, and location information is exported to motion control card 120 connected to it.The present invention
The equipment of offer is built-in with coordinate system, and the location information, motion track and shooting point embody in the form of coordinate, due to
Motion track is can to set the plane where motion track to the X0Y plane of coordinate system, then filming apparatus 40 in a plane
Identical as the XY coordinate of light source 30, Z coordinate is different.Motion control card 120 is used to control motor by servo-driver 110
Rotation, so that light source 30 be made at the uniform velocity to move with filming apparatus 40 according to preset motion track is synchronous；Receive servo-driver
The real-time position information of 110 outputs judges whether real-time position information and the coordinate for shooting point are identical, identical to illustrate shooting dress
It sets 40 and is moved to shooting point, export trigger signal to controller 20 connected to it and host computer 60.Motion track and shooting
Point is stored in host computer 60 with xml document, and motion control card 120 obtains motion track and shooting point from host computer 60
Position.In other embodiments, servo-driver 110 reads the location information of filming apparatus 40 and light source 30 in real time, and by position
Information is exported can be realized to the function of motion control card 120 by position sensor, not repeated them here.
Filming apparatus 40 includes industrial camera 410 and camera lens, wherein there is imaging sensor in industrial camera 410, and image passes
Sensor specifically uses CCD (Charge Coupled Device) imaging sensor or CMOS (Complementary Metal
Oxide Semiconductor) imaging sensor.
Controller 20 is connect with industrial camera 410 and stroboscopic coaxial light source 30.Industrial camera 410 and host computer 60 pass through number
It is connected according to line.In the present embodiment, it is coaxial to light stroboscopic under the triggering of trigger signal using light source controller for controller 20
Light source 30 simultaneously triggers industrial camera 410 and takes pictures.Wherein, industrial camera 410 and stroboscopic coaxial light source 30 connect light source controller
Same output port, the i.e. output port of light source controller issue a signal, and it is coaxial to be output to stroboscopic simultaneously by cable
Light source 30 and industrial camera 410, so that the two starts simultaneously at work (issuing light and the exposure of super brightness).
Light source controller only decides whether that triggering industrial camera 410 takes pictures.Industrial camera 410 is adopted in current shooting point
Product to be measured is shot with corresponding exposure value (the present embodiment is illustrated by taking exposure value as an example), is that data are passed through by host computer 60
Line directly controls.In other words, another xml file is stored in host computer 60, xml document record has each shooting point
Corresponding exposure value (being yield value in the embodiment having), host computer 60 learns that industrial camera 410 arrives by motion control card 120
Up to one shooting point after, according to the xml document control industrial camera 410 with exposure value corresponding with current shooting point come into
Row is taken pictures.Image processing module 50 can be set in host computer 60, in other words, the picture that industrial camera 410 is taken pictures
It exports to host computer 60, image procossing is carried out to judge whether there is open defect by host computer 60.
As it can be seen that equipment provided in this embodiment, selection " flies to clap " mode and carrys out Quick Acquisition picture, and winged bat refers to be filled in shooting
It sets or FPC is during uniform motion, need not slow down stopping when taking pictures, and take pictures while moving, and entirely be detected with reduction
Detection time improves detection efficiency.Since the speed for flying to clap is fast, using the very high stroboscopic coaxial light source of instantaneous brightness, make to expose
Sufficient brightness can be obtained in time.For stroboscopic light source due to the characteristic of its pulsed illumination, light emission luminance is the (hair being basically unchanged
It can be set between light time, only can not be too long such as 150us or 160us, it not so can burn out lamp bead；Stroboscopic light source lights rear moment
Wave crest brightness is reached, and very low range fluctuates in fluorescent lifetime, can be considered constant), light-source brightness can not change in flying bat,
The present embodiment changes the brightness of product in final photo by changing exposure value, to adapt to different defects detections to brightness
Different demands, improve the accuracy of defects detection.
Exposure value (Exposure Value, EV), which represents, can provide all camera aperture shutters combination equally exposed.
And aperture is typically only capable to manually adjust, therefore in the present embodiment, aperture is fixed, and changes exposure value by changing the time for exposure.
The shooting point is depending on the visual field of the arrangement of product to be measured and filming apparatus 40.Specifically, shooting point
Position and quantity should follow following principle: cover support plate in the region that each photo for taking pictures of shooting point is included
The region to be measured of upper all FPC, herein under the premise of, using the shooting point bit combination of minimum number.One shooting point is corresponding extremely
A few preset exposure value or yield value；To each exposure value or yield value, filming apparatus at least shoots a product to be measured
Image.Due to product material and the difference of causes of defects, in order to increase the contrast of defect imaging, the same shooting point is pre-
The exposure value or yield value being first arranged can have multiple, therefore multiple figures with different brightness can be obtained in the same shooting point
Picture, this is conducive to the detection of the defects of image.When shooting the defects detection of point there are many brightness of image demand, can choose
Exposure value or the yield value of camera are switched fast to realize, avoids the limitation that brightness is basically unchanged when stroboscopic light source shines,
It is also convenient for judgement and identification of the image processing module to different zones, different type defect.That is, a corresponding exposure of shooting point
The quantity of light value or yield value, depending on the quantity of the photo of shooting needed for the shooting point, specifically, according to the shooting point
The material (such as golden finger, protective film) of product, causes of defects (such as scratch, foreign matter) and defect characteristic are (such as height in the visual field of position
In adjacent normal region, lower than adjacent normal region etc.) at least one of depending on.Certainly, specific exposure value or yield value
Also according at least one in the corresponding material for shooting the product area to be measured that point can be shot, causes of defects and defect characteristic
Kind is to determine.In other words, different exposure values or yield value are for detecting unlike material and/or different types of defect.It claps
After taking the photograph the quantity determination of point and corresponding exposure value or yield value, exposure value or yield value, so that it may plan motion track,
Each shooting point is reasonably connected.For example, identical exposure value or the corresponding shooting point of yield value are in motion track
It is upper adjacent.Certainly, some shooting points correspond to multiple exposure values or yield value, and it is corresponding that same shooting point can further be arranged
The sequencing of multiple exposure values or yield value, shooting point is corresponding with exposure value or yield value and corresponding sequencing
Get up and is stored in above-mentioned xml document.I.e. in the present embodiment, host computer 60 learns industrial camera by motion control card 120
410 reach one shooting point after, according to the xml document and currently the number Jing Guo the shooting point (with multiple exposure values
Sequencing is corresponding) control industrial camera 410 taken pictures with exposure value corresponding with current shooting point.
Motion track refers to the motion path of filming apparatus 40 or production to be measured within a product testing period to be measured
The motion path of product.Above-mentioned motion track, shooting point are the inspections of equipment for a product testing period to be measured
The detection according to the product testing period to be measured in cycles is surveyed, realizes continuous productive process.If equipment only detects one in one cycle
A product then shoots first photograph of next product to be measured since first photo for starting one product to be measured of shooting to
Duration is a product testing period to be measured between piece.Own if equipment is detected in one cycle on a support plate
Product, then production to be measured on next support plate is shot to since first photo for starting to shoot product to be measured on a support plate
Duration is a product testing period to be measured between first photo of product.
For example, by taking Fig. 4 as an example, it is assumed that the work visual field of filming apparatus 40 is 29mm*21mm, and FPC size is 50mm*
18mm, that 2 shooting points (black origin in figure) can clap a FPC complete, it is assumed that each shooting point contains golden hand
Refer to region and protection diaphragm area (brightness needed for the defect imaging of the two is different), then each shooting point at least needs to clap 2 not
With the image of brightness, the present embodiment is achieved that by switching corresponding exposure value.Assuming that having 5 FPC products on entire support plate
It forms a line, because being to fly bat, therefore the 1st from the 1st shooting point to the 5th FPC product of the 1st FPC product shoots
Point all claps bright figure (time for exposure is relatively long), from the 2nd of the 5th FPC product shooting point to the 1st FPC product
2nd shooting point is all clapped bright figure (time for exposure is relatively long), and obtained photo is convenient for carrying out defect inspection to protection diaphragm area
It surveys, motion track is as shown in solid arrow in Fig. 4.Later, it is produced from the 1st shooting point of the 1st FPC product to the 5th FPC
1st shooting point of product all claps dark figure (time for exposure is relatively short), from the 2nd shooting point of the 5th FPC product to the
2nd shooting point of 1 FPC product all claps dark figure (time for exposure is relatively short), and obtained photo is convenient for golden finger area
Domain carries out defects detection, and motion track is as shown in dotted arrow in Fig. 4.The path of solid arrow and dotted arrow is overlapped, in Fig. 4
In be staggered and be intended merely to facilitate visual differentiation.It is exactly this 5 that solid arrow and the corresponding motion track of dotted arrow, which add up,
The motion track of FPC.Certain motion track is ever-changing, this in more than Fig. 4 is a kind of, in time identical situation, path
Shortest motion track is optimal, convenient for saving the time.Fig. 4 is the exposure value for being directed to product material in the visual field and being arranged, if considering
Specific defect, shooting point increase corresponding exposure value and increase motion track, realize filming apparatus to each FPC
And single FPC different zones, different defects are taken pictures, and are well positioned to meet the appearance detection demand of different FPC products, are adapted to
It is wide.
It elaborates that light source 30 and filming apparatus 40 are mobile at the uniform velocity to move according to motion track in above-described embodiment, moves on one side
Dynamic to take pictures when by shooting point on one side, further, if the time for exposure is fixed, the speed v at the uniform velocity moved is less than pixel
The value that the time for exposure t1 that size (in the photo shot, the length or width of pixel) x is shot divided by filming apparatus is obtained, i.e.,
V < (x/t1), so can theoretically avoid smear.If speed v is fixed, such as: Pixel Dimensions x=7um, speed v=
500mm/s, it is corresponding theoretical without smear maximum exposure time t1max=14us, i.e., it is theoretical without smear maximum exposure time be with
The speed at the uniform velocity moved is by the time needed for a pixel.As long as the time for exposure of camera is less than or equal to 14us, image
Smear is not had, because camera only moves the distance less than a pixel in 14us.In real work, the time for exposure is less than
Or it is equal to three times theory without smear maximum exposure time, obvious smear is not had.That is, in order to increase may be selected for time for exposure
Range, time for exposure when filming apparatus shooting can be used are less than or equal to three times theory without this limit of smear maximum exposure time
Condition processed avoids smear.
Although the signal that light source controller 20 exports can be given to stroboscopic coaxial light source 30 and industrial camera 410, work simultaneously
There is a problem of in 410 real work of industry camera exposure have delay and it is unstable, that is, the time for exposing beginning, there may be fluctuations
(delay), if the fluctuation range (unit is the time) of camera exposure time started is Y.Therefore stroboscopic coaxial light source 30 shine hold
The continuous time is greater than the time for exposure, it is preferred that the luminous duration of stroboscopic coaxial light source 30 is greater than or equal to the time for exposure and two
The sum of times fluctuation range Y.
Above-described embodiment is corresponding to switch for the situation in the shooting point visual field it is found that equipment provided by the invention
The camera exposure time, realize high speed fly to clap in be switched fast the brightness of image that shooting obtains, solve light source controller without
Method is switched fast the problem of stroboscopic light source brightness, realizes and just switches brightness of image in acquisition image process, to improve
The accuracy of defect image identification, detection efficiency are higher.
Above-described embodiment is by switching exposure value, and the yield value for switching camera can equally play the effect of switching brightness of image
Fruit, by above-described embodiment exposure value or the time for exposure be substituted for yield value and the embodiment of yield value can be obtained, do not do superfluous
It states.
The equipment provided based on the above embodiment, the present invention also provides a kind of method of product appearance defect detection, such as Fig. 5
It is shown, include the following steps:
Step 1 shoots point according to the arrangement of product to be measured and the visual field setting of filming apparatus.
Step 2, according in the material of the product area to be measured that can shoot of shooting point, causes of defects and defect characteristic
At least one determines corresponding exposure value or yield value；Shoot the corresponding at least one exposure value of point or yield value；According to bat
The quantity of point and its corresponding exposure value or yield value is taken the photograph, motion track is arranged, keeps the process of motion track at least once each
A shooting point, the number by shooting point are no less than the quantity of corresponding exposure value or yield value.
Step 3 drives the light source movement synchronous with filming apparatus according to motion track, or according to motion track drive to
It is mobile to survey product；Multiple shooting points, the shooting point and preset exposure value or gain are provided on the motion track
Value corresponds to.
Step 4, itself be moved to shooting point when, or the product to be measured be moved to shooting point when, according to
The corresponding exposure value of shooting point or yield value shoot product to be measured, obtain the image of product to be measured.
Step 5 is handled the image of the product to be measured to analyze product to be measured with the presence or absence of defect and defect
Type.
Since the detailed process and beneficial effect of the method have elaborated in above equipment embodiment, do not do herein
It repeats.
It will be understood by those skilled in the art that all or part of the steps of various methods can pass through in above embodiment
Program instructs related hardware to complete, which can be stored in a computer readable storage medium, storage medium can wrap
It includes: read-only memory, random access memory, disk or CD etc..
Use above specific case is illustrated the present invention, is merely used to help understand the present invention, not to limit
The system present invention.For those skilled in the art, according to the thought of the present invention, can also make several simple
It deduces, deform or replaces.
Claims (10)
1. a kind of equipment for product appearance defect detection, characterized by comprising:
Light source, for irradiating product to be measured；
Fly to clap driving device, the movement for driving light source synchronous with filming apparatus according to preset motion track, or is used for
Drive product to be measured mobile according to preset motion track；Multiple shooting points, the shooting are provided on the motion track
Point is corresponding with preset exposure value or yield value；
Filming apparatus, for itself be moved to shooting point when, or the product to be measured be moved to shooting point when, root
Product to be measured is shot according to the corresponding exposure value of shooting point or yield value, obtains the image of product to be measured.
2. the equipment for product appearance defect detection as described in claim 1, it is characterised in that further include image procossing mould
Block is handled for the image to the product to be measured to analyze product to be measured with the presence or absence of defect.
3. as described in claim 1 for product appearance defect detection equipment, which is characterized in that the shooting point according to
Depending on the arrangement of product to be measured and the visual field of filming apparatus.
4. the equipment for product appearance defect detection as described in claim 1, which is characterized in that the exposure value or gain
At least one of material, causes of defects and the defect characteristic of product area to be measured that value can be shot according to corresponding shooting point
To determine.
5. the equipment for product appearance defect detection as described in claim 1, which is characterized in that the light source is strobe light
Source.
6. as described in claim 1 for product appearance defect detection equipment, which is characterized in that filming apparatus relative to
The movement for surveying product is at the uniform velocity to move, wherein the speed at the uniform velocity moved is less than the exposure that Pixel Dimensions are shot divided by filming apparatus
The value that time obtains.
7. as described in claim 1 for product appearance defect detection equipment, which is characterized in that filming apparatus relative to
The movement for surveying product is at the uniform velocity to move, wherein time for exposure when filming apparatus is shot is less than or equal to three times theory without smear
Maximum exposure time；The theory is when being passed through needed for a pixel with the speed at the uniform velocity moved without smear maximum exposure time
Between.
8. the equipment for product appearance defect detection as described in claim 1, which is characterized in that identical exposure value or gain
It is adjacent on the motion track to be worth corresponding shooting point.
9. the equipment for product appearance defect detection as described in claim 1, which is characterized in that a shooting point is corresponding
At least one preset exposure value or yield value.
10. a kind of method of the product appearance defect detection based on equipment described in claim 1, it is characterised in that including walking as follows
It is rapid:
It is driven according to the movement that preset motion track drives light source synchronous with filming apparatus, or according to preset motion track
Product to be measured is mobile；Multiple shooting points, the shooting point and preset exposure value or increasing are provided on the motion track
Benefit value corresponds to；
When itself being moved to shooting point, or when the product to be measured is moved to shooting point, according to the shooting point
Corresponding exposure value or yield value shoot product to be measured, obtain the image of product to be measured.
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