CN103091331A - System and method for visual inspection on burrs and stain defects of radio frequency identification (RFID) antennae - Google Patents
System and method for visual inspection on burrs and stain defects of radio frequency identification (RFID) antennae Download PDFInfo
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Abstract
The invention discloses a method for visual inspection on burrs and stain defects of radio frequency identification (RFID) antennae. The method comprises the following steps of: calibrating a camera device, and then shooting images of each RFID antenna to be inspected through the cooperation of the camera device and a strip-type or backlight source; acquiring the shot images of the antennae, and matching the acquired shot images with images of an antenna template to obtain pre-alignment information; taking off corresponding burrs and stain inspection areas from the images of the antennae according to regions of interest (ROI) on the images of the antenna template and the pre-alignment information; respectively carrying out binary processing on the inspection areas taken off from the images and the ROI, and then carrying out image subtraction; and carrying out blob analysis on residual images subjected to the image subtraction, and determining results of the burrs and the stain defects. The invention also discloses a system for carrying out the corresponding visual inspection. Through the method and the system, the inspection process of the burr/stain quality of the RFID antennae can be carried out efficiently and accurately, and the positions of the defects can be accurately positioned, so that the method and the system are particularly suitable for industrial processing and manufacturing processes of the RFID antennae.
Description
Technical field
The invention belongs to RFID and make the field, more specifically, relate to a kind of vision detection system and the method for RFID antenna burr and smudge defect.
Background technology
Video identification is also the RFID technology, is called again electronic tag, is to identify specific objective and read and write the communication technology of related data by radio signals.Its element comprises label, reader and antenna, and wherein label is comprised of coupling element and chip, and the electronic code that each label is corresponding unique also is attached on object for indicating destination object; Reader is used for read-write or writes label information, and antenna is used for transmitting radiofrequency signal between label and reader.Because the RFID technology need not set up machinery between recognition system and specific objective or optics contacts, and possess the advantages such as high speed identification, anti-adverse environment and strong security, so in logistics, warehousing management, medical treatment and identification, food processing, and a plurality of fields such as the production data Real Time Monitoring of industrial manufacture process and quality tracing obtain a wide range of applications.
In RFID equipment; antenna is as main Energy Transfer functional layer; it is the electronic circuit that designs according to the desired function of radio-frequency (RF) identification; it is arranged in conductive silver paste or conductive carbon paste on PVC, PC or PET antenna substrate by modes such as etching, thermoprint or electrically conductive ink printings, and forms with encapsulation such as surface layer, protective seam and bottoms.The crudy of the wiring pattern of antenna directly has influence between label and reader farthest transmission of signal, even can have influence on the normal operation of RFID equipment.Common antenna open defect for example comprises that live width is excessive or too small, pattern broken string/adhesion phenomenon occurs, perhaps has burr and smudge defect etc.Wherein, burr and stain be affect in the open defect of antenna quality very common a kind of.So-called burr, refer to due to manufacturing process reasons such as etching, printings, lines are one-sided or both sides occur is different from the raised or sunken of layout in antenna plane, this phenomenon may have influence on electric property, quality factor (Q) or the label resonance frequency (ω) of antenna, even causes the short circuit of antenna traces or opens circuit; So-called stain refers to remove outside normal antenna pattern the unnecessary pattern that presents on substrate.The concrete area of burr and stain or deviation threshold can be determined according to kind, purposes, size and complexity according to the RFID label.
At present, it is blank that high-precision antenna pattern checkout equipment at home and abroad all belongs to, in prior art, major part is all to carry out command detection by artificial (human eye is directly observed antenna substrate printing situation) or half artificial (human eye is by video camera screen viewing antenna substrate printing situation), so not only efficient is low, cost is high, and the accuracy of test result and consistance be difficult to be guaranteed, and greatly limited the development of RFID antenna tag production industry.In recent years along with more and more higher to the requirement that detects robotization, the detection scheme of the antenna quality of test result has also appearred directly antenna performance being detected and providing, whether qualifiedly namely directly measure antenna with card reader, obvious this method is for the antenna that does not paste chip and inapplicable.In addition, the automatic detection scheme that utilizes in addition the impedance automatic Matching to test, the detection scheme of mentioning in as interim in microblogging journal volume the 4th August the 24th in 2008 " design of RFID label antenna testing jig " literary composition etc., these detection schemes detect based on the antenna electrical performance, whether qualifiedly can only detect antenna, be applicable to the detection production of streamlined, but can not explicitly point out the problem that exists in manufacturing process.Especially, for the open defect of burr and stain and so on, lack effective detection means in prior art, and be difficult to accurately know the residing particular location of defective.Correspondingly, exist in association area the RFID antenna is comprised that the open defect detection mode of burr and smudge defect makes further improved technical need.
Summary of the invention
Above defective or technical need for prior art, the object of the present invention is to provide vision detection system and the method for a kind of RFID antenna burr and smudge defect, it can high-level efficiency, carry out in high accuracy the burr of RFID antenna/stain quality testing process, and can accurately locate the residing particular location of burr/smudge defect, be convenient to thus Real-time Feedback and quality control, be applicable to simultaneously the processing and manufacturing process of industrialization RFID.
According to one aspect of the present invention, the vision detection system of a kind of RFID antenna burr and smudge defect is provided, this vision detection system comprises that camera head, Three Degree Of Freedom move module, strip source, back light and vision inspection apparatus, is characterized in that:
Described camera head is arranged on and can moves on module along the Three Degree Of Freedom that X-axis, Y-axis and three directions of Z axis move around, and is in the top of RFID antenna to be detected, is used within sweep of the eye each RFID antenna being taken respectively complete image at it;
Described strip source is symmetricly set on the both sides of camera head, described back light is arranged on the below of RFID antenna to be detected, thus according to the difference of RFID antenna substrate and selectively unlocking and matching with camera head, in order to carry out shooting operation to antenna;
Described vision inspection apparatus comprises demarcates unit, image acquisition unit, images match unit, image segmentation unit, image operation unit and connected domain analysis unit, wherein demarcate the unit and be used for the captured antenna diagram of camera head is looked like to set up pixel coordinate, and convert pixel coordinate under same world coordinate system coordinate figure; Image acquisition unit is used for gathering the captured antenna diagram picture of camera head; The images match unit is used for antenna diagram picture and the antenna template image that gathers mated, and obtains the pre-align information that comprises the anglec of rotation, central point displacement; The image segmentation unit is used for according to area-of-interest default on the antenna template image, and in conjunction with the pre-align information of obtaining, takes off the burr corresponding with area-of-interest and dust detection regional from the antenna diagram picture; The image operation unit is used for burr that area-of-interest default on the antenna template image and image segmentation unit are taken and binary conversion treatment is carried out respectively in the dust detection zone, then both carries out image is subtracted each other processing; The connected domain analysis unit is used for extracting the residual image after image subtraction is processed, and it is carried out the blob analysis operation, obtains thus the testing result of relevant burr and smudge defect.
As further preferably, described vision inspection apparatus also comprises display unit, is used for showing centre and the final detection result of burr and smudge defect testing process.
As further preferably, described camera head is the industrial CCD camera.
According to another aspect of the present invention, corresponding detection method also is provided, it is characterized in that, this detection method comprises the following steps:
(a) before adopting camera head picked-up RFID antenna diagram picture to be detected, carry out the demarcating steps of camera head;
(b) the operation Three Degree Of Freedom moves module and makes camera head arrive desired location, and by its with strip source or back light between coordinate, each RFID antenna to be detected is taken respectively complete image;
(c) the captured antenna diagram picture of collection, and each antenna diagram picture that will collect is complementary with the antenna template image respectively, obtains to comprise thus the pre-align information of the anglec of rotation, central point displacement;
(d) according to one or more area-of-interests default on the antenna template image, and the pre-align information that integrating step (c) is obtained looks like to adjust to antenna diagram, then takes the burr corresponding with area-of-interest and dust detection zone from the antenna diagram picture;
(e) burr that step (d) is taken and the area-of-interest on dust detection zone and antenna template image are carried out respectively binary conversion treatment, then both carries out image are subtracted each other processing;
(f) residual image that obtains after step (e) image subtraction is processed carries out blob and analyzes: do not extract the connected domain zone after blob analyzes, each connected domain region area that perhaps extracts and the total area thereof all within the tolerance threshold value, are judged and should do not had the burr smudge defect by detected antenna; And the connected domain zone of extracting after blob analyzes exists single region area or the total area to exceed the situation of tolerate threshold value, and judgement is detected antenna and has burr and smudge defect.
As further preferably, in step (f), can according to the real area size in single connected domain zone, judge that further this zone belongs to burr or smudge defect.
As further preferably, in step (f), when judgement existed burr or smudge defect, the central point pixel coordinate of locating this connected domain zone recorded its area information simultaneously, determines thus defective locations and the type thereof of detected antenna.
As further preferably, when the connected domain zone total area that extracts after blob analyzes exceeds the tolerance threshold value, locate the central point pixel coordinates in all connected domains zones and get simultaneously its mean value, and with this mean value as the defective present position that is detected antenna.
In general, according to the open defect detection system for the RFID antenna of the present invention and method thereof compared with prior art, mainly possess following technological merit:
1, by adopting the vision-based detection mode, can stablize, detect exactly burr or the smudge defect of various dissimilar complex antenna patterns, and can guarantee accuracy and the consistance of testing result when improving detection efficiency;
2, can carry out different set and adjustment to burr and stain tolerance threshold value according to the detection demand, be convenient to satisfy the requirement of different production standards, be applicable to industrialized Practical manufacturing process;
3, whole detection system architecture compactness, convenient operation, can apply in a flexible way in the RFID of different substrate type Fields detection and obtain high-resolution detected image; In addition, can also be when finding out burr/smudge defect, accurately the residing particular location of location defect and type thereof, be convenient to thus carry out in follow-up manufacturing process respective quality and control and adjust.
Description of drawings
Fig. 1 is used for the general structure schematic diagram of the vision detection system of RFID antenna burr and smudge defect according to the present invention;
Fig. 2 is the process chart according to the visible detection method for RFID antenna burr and smudge defect of the present invention;
In institute's drawings attached, identical Reference numeral is used for representing identical element or structure, wherein:
1-camera head 2-Three Degree Of Freedom moves module 3-strip source 4-back light 5-vision inspection apparatus 6-frame 7-antenna 501-to be detected and demarcates 506-connected domain analysis unit, 505-image operation unit, 504-image segmentation unit, 502-image acquisition units 503-images match unit, unit 507-display unit
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 is used for the general structure schematic diagram of the vision detection system of RFID antenna burr and smudge defect according to the present invention.As shown in FIG., comprise mainly that according to the vision detection system for RFID antenna burr and smudge defect of the present invention camera head 1, Three Degree Of Freedom move module 2, strip source 3, back light 4 and vision inspection apparatus 5.Camera head 1 is for example the form of industrial camera, it is arranged on the Three Degree Of Freedom that is arranged at frame 6 and moves on module 2 and be in the top of making the RFID antenna as object to be detected, can move freely on X, Y and Z-direction thus, and within sweep of the eye each RFID antenna to be detected be taken respectively complete image at it.Necessary illumination when photographic images being provided for camera head 1, both sides, front and back at camera head 1 (can be also the left and right sides, it is decided from the installation form that moves on module in Three Degree Of Freedom according to camera head) be symmetrically installed with strip source 3, and can move with camera head.In addition, also be provided with back light 4 below the RFID antenna, this is mainly to consider that antenna substrate may be made of unlike material: when substrate is transparency carrier, can utilize back light 4 to be thrown light on; And, can use strip source 3 instead and be thrown light on during opaque or poor transparency when substrate.
When camera head 1 by with the coordinating of strip source 3 or back light 4, after each RFID antenna to be detected was obtained respectively its complete image within the vision, camera head 1 was transferred to vision inspection apparatus 5 by data line or wireless mode with photographic images.This vision inspection apparatus 5 for example is the form of computing machine, and comprises and demarcate unit 501, image acquisition units 502, images match unit 503, image separation unit 504, image operation unit 505 and connected domain analysis unit 506.Wherein, demarcate unit 501 and be used for the image that camera head 1 will be taken is set up pixel coordinate, and convert pixel coordinate under same world coordinate system coordinate figure; Image acquisition units 502 is used for gathering the captured image of camera head 1; Each antenna diagram picture and antenna template image (standard antenna image) that images match detecting unit 503 is used for image acquisition units 502 is gathered mate, and obtain the pre-align information that comprises the anglec of rotation, central point displacement; Image segmentation unit 504 is used for according to area-of-interest (ROI default on the antenna template image, Region Of Interest), and in conjunction with the pre-align information of obtaining, take off the burr corresponding with area-of-interest and dust detection regional from the antenna diagram picture; Image operation unit 505 is used for burr that area-of-interest default on the antenna template image and image segmentation unit are taken and binary conversion treatment is carried out respectively in the dust detection zone, then to both carries out image phase reducings; 506 of connected domain analysis unit are used for extracting the residual image after image subtraction is processed, and it is carried out the blob analysis operation, extract thus burr and stain characteristic and obtain the testing result of relevant burr and smudge defect.
In addition, for the ease of practical operation and control, vision inspection apparatus 5 can also comprise display unit 507, and this display unit 507 is used for showing centre and the final detection result of burr and smudge defect testing process, and can inform detection of code and the content that operating personnel are concrete.
Below, will specifically describe according to burr of the present invention and dust detection technological process.As shown in Figure 2, the visible detection method according to RFID antenna burr of the present invention and stain comprises the following steps:
At first, before taking its RFID antenna within the vision by camera head 1, carry out the pre-demarcating steps of camera head.Pre-demarcating steps specifically is included as the image that camera head will take and sets up pixel coordinate, and converts this pixel coordinate under same world coordinate system coordinate figure.In addition, if the parameter of running parameter during with upper task compared to some extent change, also should re-execute pre-demarcating steps, correct and distort and guarantee to obtain correct test result.
Then, move module 2 by the operation Three Degree Of Freedom and make camera head 1 arrive desired locations, and by with coordinating of strip source 3 or back light 4, each RFID antenna to be detected being taken its complete image within the vision.Camera head 1 transfers to vision inspection apparatus 5 with captured general image, and is gathered by image acquisition units 502.
Then, each antenna diagram picture that gathers for image acquisition unit 502, each antenna diagram picture that images match unit 503 will collect respectively with the matching operation of antenna template image carries out image, obtain thus to comprise the pre-align information of the anglec of rotation, central point displacement etc.
After obtaining image pre-align information, image segmentation unit 504 can be according to one or more area-of-interests default on the antenna template image, and the pre-align information obtained of combining image matching unit 503, after antenna diagram is looked like to carry out corresponding rotation and skew adjustment, take off the burr corresponding with area-of-interest and dust detection regional from the antenna diagram picture that gathers.Particularly, suppose in images match the known image rotation angle θ, and play central point with respect to displacement x, the y of standard masterplate central point, and on the known template image, the upper left angular coordinate is (a, b), peak width and highly be respectively w, the zone of h is the ROI zone, with image rotation to be detected-θ degree, and take off upper left corner coordinate and be (a-x, b-y), peak width and highly be respectively w, the rectangular area of h is zone to be detected.
Then, the image calculation process need to be made in the ROI zone on the burr taken off and dust detection zone and antenna template image.Can first carry out some pre-service to them early stage, as filtering operation etc., then carries out respectively binary conversion treatment.Then, both are done image subtraction process, obtain thus the residual image at reflection antenna diagram picture to be detected and antenna template image difference place.
At last, the residual image after connected domain analysis unit 506 extraction image subtractions processing, and it is carried out the blob analysis operation, according to the connected domain quantity that is checked through and connected domain area, determine whether thus to exist burr and smudge defect and provide testing result.As a rule, if the blob region area a that extracts
i(tolerance need to according to detecting degree of accuracy and detecting Location of requirement, be a as screening conditions usually in tolerance
i≤ a
max, a
maxBe each blob zone patient maximum area in detection) and the blob zone total area (tolerance need to according to detecting degree of accuracy and detecting Location of requirement, be ∑ a as screening conditions usually in tolerance
i≤ A
max, A
maxBy all with blob region area summation patient maximum area in detection), think not have burr or smudge defect in the surveyed area of this antenna.If the area a in certain blob zone detected
iSurpassed tolerance (a
iA
max), locate this blob regional center point pixel coordinate value (m, n), and record its area information a
i, by this centre coordinate value information (m, n) and area information, to have area be a at certain coordinate place of former image to be detected as can be known
iBurr or smudge defect; In addition, if blob is zone total area ∑ a
iSurpassed tolerance (∑ a
iA
max), think that equally it exists burr or smudge defect, and the center point coordinate mean value of getting all blob zone is orientated the position that defective exists as.
Those skilled in the art will readily understand; the above is only preferred embodiment of the present invention; not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. the vision detection system of a RFID antenna burr and smudge defect, this vision detection system comprises that camera head, Three Degree Of Freedom move module, strip source, back light and vision inspection apparatus, is characterized in that:
Described camera head is arranged on and can moves on module along the Three Degree Of Freedom that X-axis, Y-axis and three directions of Z axis move around, and is in the top of RFID antenna to be detected, is used within sweep of the eye each RFID antenna being taken respectively complete image at it;
Described strip source is symmetricly set on the both sides of camera head, described back light is arranged on the below of RFID antenna to be detected, thus according to the difference of RFID antenna substrate and selectively unlocking and matching with camera head, in order to carry out shooting operation to antenna;
Described vision inspection apparatus comprises demarcates unit, image acquisition unit, images match unit, image segmentation unit, image operation unit and connected domain analysis unit, wherein demarcate the unit and be used for the captured antenna diagram of camera head is looked like to set up pixel coordinate, and convert pixel coordinate under same world coordinate system coordinate figure; Image acquisition unit is used for gathering the captured antenna diagram picture of camera head; The images match unit is used for antenna diagram picture and the antenna template image that gathers mated, and obtains the pre-align information that comprises the anglec of rotation, central point displacement; The image segmentation unit is used for according to area-of-interest default on the antenna template image, and in conjunction with the pre-align information of obtaining, takes off the burr corresponding with area-of-interest and dust detection regional from the antenna diagram picture; The image operation unit is used for burr that area-of-interest default on the antenna template image and image segmentation unit are taken and binary conversion treatment is carried out respectively in the dust detection zone, then both carries out image is subtracted each other processing; The connected domain analysis unit is used for extracting the residual image after image subtraction is processed, and it is carried out the blob analysis operation, obtains thus the testing result of relevant burr and smudge defect
2. vision detection system as claimed in claim 1, is characterized in that, described vision inspection apparatus also comprises display unit, is used for showing centre and the final detection result of burr and smudge defect testing process.
3. vision detection system as claimed in claim 1 or 2, is characterized in that, described camera head is preferably the industrial CCD camera.
4. a method that is used for RFID antenna burr and smudge defect execution vision-based detection, is characterized in that, the method comprises the following steps:
(a) before adopting camera head picked-up RFID antenna diagram picture to be detected, carry out the demarcating steps of camera head;
(b) the operation Three Degree Of Freedom moves module and makes camera head arrive desired location, and by its with strip source or back light between coordinate, each RFID antenna to be detected is taken respectively complete image;
(c) the captured antenna diagram picture of collection, and each antenna diagram picture that will collect is complementary with the antenna template image respectively, obtains to comprise thus the pre-align information of the anglec of rotation, central point displacement;
(d) according to one or more area-of-interests default on the antenna template image, and the pre-align information that integrating step (c) is obtained looks like to adjust to antenna diagram, then takes the burr corresponding with area-of-interest and dust detection zone from the antenna diagram picture;
(e) burr that step (d) is taken and the area-of-interest on dust detection zone and antenna template image are carried out respectively binary conversion treatment, then both carries out image are subtracted each other processing;
(f) residual image that obtains after step (e) image subtraction is processed carries out blob and analyzes: do not extract the connected domain zone after blob analyzes, each connected domain region area that perhaps extracts and the total area thereof all within the tolerance threshold value, are judged and should do not had the burr smudge defect by detected antenna; And the connected domain zone of extracting after blob analyzes exists single region area or the total area to exceed the situation of tolerate threshold value, and judgement is detected antenna and has burr and smudge defect.
5. method as claimed in claim 4, is characterized in that, in step (f), can according to the real area size in single connected domain zone, judge that further this zone belongs to burr or smudge defect.
6. method as described in claim 4 or 5, it is characterized in that, in step (f), when judgement exists burr or smudge defect, the central point pixel coordinate of locating this connected domain zone records its area information simultaneously, determines thus defective locations and the type thereof of detected antenna.
7. as the described method of claim 4-6 any one, it is characterized in that, when the regional total area of the connected domain of extracting after blob analyzes exceeds the tolerance threshold value, locate the central point pixel coordinates in all connected domains zones and get simultaneously its mean value, and with the defective present position of this mean value as detected antenna.
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