CN103018261B - Appearance fault detecting system and appearance fault detecting method of RFID (Radio Frequency Identification Device) antenna - Google Patents
Appearance fault detecting system and appearance fault detecting method of RFID (Radio Frequency Identification Device) antenna Download PDFInfo
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Abstract
The invention discloses an appearance fault detecting method of an RFID (Radio Frequency Identification Device) antenna. The appearance fault detecting method of the RFID antenna comprises the following steps of: pre-calibrating a camera device; moving the camera device to a desired position, and shooting an image of an antenna to be detected through the coordination between the camera device and a bar-shaped light source or a backlight light source; collecting the shot image and carrying out edge detection on the shot image so as to obtain a quantity of the antenna within a detection image, and respectively record a length, a width, a coordinate value and other information of a center point in the image to be detected; and selectively carrying out at least one of projects, such as line width detection, pattern disconnection/adhesion detection, and burr/print pollution detection according to demands so as to obtain a quality conclusion of the antenna to be detected. The invention further discloses a corresponding appearance fault detecting system. With the adoption of the appearance fault detecting method and the appearance fault detecting system provided by the invention, the quality detection can be conducted on the RFID antenna in a manner with the advantages of compact structure and convenience in operation, and a detection result can be obtained with high efficiency and high accuracy. Meanwhile, convenience in real-time feedback and quality control can be realized. Therefore, the appearance fault detecting method and the appearance fault detecting system are particularly applicable to a machining and manufacturing process of an industrial RFID.
Description
Technical field
The invention belongs to RFID and manufacture field, more specifically, relate to a kind of open defect detection system and method thereof of RFID antenna.
Background technology
Video identification also i.e. RFID technique, is also called electronic tag, is by radio signals identification specific objective and reads and writes the communication technology of related data.Its element comprises label, reader and antenna, and wherein label is made up of coupling element and chip, and the corresponding unique electronic code of each label is also attached on object for indicating destination object; Reader is used for read-write or write label information, and antenna is used for transmitting radiofrequency signal between label and reader.Because RFID technique need not set up machinery or optical contact between recognition system and specific objective, and possess the advantages such as high speed identification, anti-adverse environment and strong security, therefore in logistics, warehousing management, medical treatment and identification, food processing, and the production data of industrial manufacturing process is monitored in real time and multiple field such as quality tracing obtains a wide range of applications.
In RFID device; antenna is as main Energy Transfer functional layer; it is the electronic circuit designed according to the function required by radio-frequency (RF) identification; conductive silver paste or conductive carbon paste are arranged on PVC, PC or PET antenna substrate by the mode such as etching, thermoprint or electrically conductive ink printing by it, and encapsulate with surface layer, protective seam and bottom etc. and form.Can 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 device.
But, current high-precision antenna pattern checkout equipment all belongs to blank at home and abroad, in prior art, major part is all perform command detection by artificial (human eye is directly observed antenna substrate and printed situation) or semi-artificial (human eye prints situation by video camera screen viewing antenna substrate), so not only efficiency is low, cost is high, and the accuracy of test result and consistance are difficult to be guaranteed, and strongly limit the development of RFID antenna label manufacturing business.Correspondingly, there is the technical need of the quality testing mode of RFID antenna being made to improvement further in the related art.
Summary of the invention
For above defect or the technical need of prior art, the object of the present invention is to provide a kind of open defect detection system and method thereof of RFID antenna, it is by carrying out quality testing in the mode of compact conformation, convenient operation to the live width of RFID antenna, the emphasis factors such as broken string/adhesion and burr/printing pollution, can high-level efficiency, know the quality measurements of RFID antenna high accuracy, and be convenient to Real-time Feedback and quality control, be thus particularly useful for the processing and manufacturing process of industrialization RFID.
According to one aspect of the present invention, provide a kind of open defect detection system of RFID antenna, it is characterized in that, this open defect detection system comprises camera head, Three Degree Of Freedom moves module, strip source, back light and vision inspection apparatus, wherein:
Described camera head is arranged on the Three Degree Of Freedom that can move around along X-axis, Y-axis and Z axis three directions and moves on module, and is in the top of RFID antenna to be detected, for taking the image of antenna within sweep of the eye at it;
Described strip source is symmetricly set on the both sides of camera head, and 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 matches with camera head, operates to perform the shooting of antenna;
Described vision inspection apparatus comprises demarcates unit, image acquisition unit, edge detection unit, wire width measuring unit and connected domain analysis unit, wherein demarcate unit to be used for setting up pixel coordinate to the image that camera head will be taken, and pixel coordinate is converted to the coordinate figure under same world coordinate system; Described image acquisition unit is for gathering the antenna diagram picture captured by camera head; Described edge detection unit is used for performing rim detection to gathered general image, and the RFID antenna quantity obtained in this image and separately corresponding length and width thereof and center point coordinate value information; Described wire width measuring unit is used for each antenna settings region-of-interest in gathered image, and the live width of the average live width measured respectively in this region and standard antenna is made comparisons; Described connected domain analysis unit is used for the independent image obtaining each antenna from gathered image, and perform binary conversion treatment and blob and analyze testing result to obtain relevant pattern broken string and/or adhesion, or perform binary conversion treatment again after the image of each antenna and standard antenna images match being subtracted each other and blob analyzes, obtain the testing result polluted about burr and/or printing thus.
As further preferably, described vision inspection apparatus also comprises display unit, for showing centre in open defect testing process and final detection result.
As further preferably, described camera head is industrial CCD camera.
According to another aspect of the present invention, additionally provide corresponding detection method, it is characterized in that, this detection method comprises the following steps:
A (), before employing camera head absorbs RFID antenna image to be detected, performs the pre-demarcating steps of camera head;
B () moves module by operation Three Degree Of Freedom makes camera head arrive desired location, and by itself and coordinating between strip source or back light, takes its image to one or more RFID antenna to be detected;
Image captured by (c) collection, and rim detection is performed to it, then the testing conditions edge center point that also namely rim detection length conforms to standard antenna will be met be decided to be the central point of antenna to be detected, statistics meets the edge center point number of testing conditions to obtain the RFID antenna quantity in this detected image, and records the information such as the relevant length and width of each antenna and center point coordinate value respectively;
D (), according to duty requirements, selectivity performs at least one item in following detecting step, and when wherein any one detecting step is undesirable, the RFID antenna corresponding to judgement is off quality:
(d1) live width detects: to each antenna settings region-of-interest in detected image, and the live width of the average live width measured in this region and standard antenna is made comparisons;
(d2) broken string/adhesion detects: according to the length and width about each RFID antenna obtained after rim detection and center point coordinate value information, obtain the independent image of each antenna respectively and binary conversion treatment and blob analysis are performed to it, then according to its black, white connected domain quantity compared with black, the white connected domain quantity corresponding to standard antenna, determine whether thus pattern broken string and/or adhesion phenomenon occur;
(d3) burr/printing pollution detection: according to the length and width about each RFID antenna obtained after rim detection and center point coordinate value information, obtain the independent image of each antenna respectively, and itself and standard antenna images match are subtracted each other rear execution binary conversion treatment and blob analyzes, then there is situation and area information thereof according to black region, determine whether thus to produce burr and/or printing is polluted.
As further preferably, in step (b), industrial CCD camera is adopted to come one or more RFID antenna shooting images to be detected.
As further preferably, in step (d2), if the quantity of black, the white connected domain of antenna diagram picture to be detected is equal with black, the white connected domain quantity corresponding to standard antenna, then not think to there is pattern broken string adhesion phenomenon; Otherwise, then judge that the RFID antenna corresponding to this single image does not meet quality requirements.
As further preferably, in step (d2), if the number of white connected domain is more than the white connected domain number corresponding to standard antenna in antenna diagram picture to be detected, or the former black connected domain number is less than the black connected domain number corresponding to the latter, then judge that this antenna exists pattern adhesion phenomenon; If the number of white connected domain is less than the white connected domain number corresponding to standard antenna in antenna diagram picture to be detected, or the former black connected domain number corresponding to the unnecessary the latter of black connected domain number, then judge that this antenna exists pattern broken string phenomenon.
As further preferably, in step (d3), if there is not black region, although or there is its real area of black region and be all within tolerance, then judge to there is not burr or print to pollute; If there is black region and the real area of this black region exceeds set tolerance threshold, then it is determined that the presence of burr or print and pollute.
As further preferably, in step (d3), according to the real area size of described black region, can judge that this region belongs to burr or prints further and pollute.
In general, according to the open defect detection system for RFID antenna of the present invention and method thereof compared with prior art, following technological merit is mainly possessed:
1, the quality testing mode by adopting first rim detection location to carry out local defect analysis again, can adapt to the detection of various different complex antenna pattern, and ensures accuracy and the consistance of testing result while contributing to improving detection efficiency;
2, by selecting to detect factors such as antenna live width, pattern broken string/adhesion and burr/printing pollutions, can the order of quality testing be adjusted according to different demand and lay particular stress on a little, be convenient to realization flowization management, be therefore particularly useful for industrialized working control;
3, overall appearance defect detecting system compact conformation, convenient operation, can apply in a flexible way in the high-resolution detected image of RFID antenna detection acquisition of different substrate type, and reach very high vision-based detection precision.
Accompanying drawing explanation
Fig. 1 is the general structure schematic diagram according to the open defect detection system for RFID antenna of the present invention;
Fig. 2 is the formation schematic diagram of the pick-up unit of open defect shown in Fig. 1;
Fig. 3 is the process chart according to the open defect detection method for RFID antenna of the present invention;
In all of the figs, 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 unit 502-image acquisition unit 503-edge detection unit 504-wire width measuring unit 505-connected domain analysis unit 506-display unit
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, 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, be not intended to limit the present invention.
Fig. 1 is the general structure schematic diagram according to the open defect detection system for RFID antenna of the present invention.As shown in FIG., mainly comprise camera head 1 according to the open defect detection system for RFID antenna of the present invention, 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 Three Degree Of Freedom and moves on the module 2 and top manufacturing RFID antenna be in as object to be detected, can move freely on X, Y and Z-direction thus, and take the image of multiple antenna substrate within sweep of the eye at it.Necessary illumination when taking image is provided in order to give camera head 1, (also can be the left and right sides in the both sides, front and back of camera head 1, it is determined from moving the installation form 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, be also provided with back light 4 in the below of RFID antenna, this mainly considers that antenna substrate may be made up of unlike material: when substrate is transparency carrier, and back light 4 can be utilized to be thrown light on; And when substrate is opaque or poor transparency time, then can use strip source 3 instead and be thrown light on.
When camera head 1 by with the coordinating of strip source 3 or back light 4, after obtaining the image of its one or more RFID antenna 7 within sweep of the eye, camera head 1 will take image transmitting to vision inspection apparatus 5 by data line or wireless mode.The form of this vision inspection apparatus 5 for example in computing machine, and comprise demarcation unit 501, image acquisition unit 502, edge detection unit 503, wire width measuring unit 504 and connected domain analysis unit 505.Wherein, demarcate unit 501 and set up pixel coordinate for the image will taken camera head 1, and pixel coordinate is converted to the coordinate figure under same world coordinate system.Image acquisition unit 502 is for gathering the image captured by camera head 1.The image that edge detection unit 503 gathers according to image acquisition unit 502, performing rim detection to it and meeting testing conditions is also the central point that the edge center point that conforms to standard antenna (namely as the Antenna Design template of benchmark) of rim detection length is decided to be antenna to be detected, and add up same qualified edge center point number, obtain RFID antenna quantity complete in this detected image thus; In addition, according to the coordinate figure demarcating unit 501 conversion acquisition, the information such as the relevant length and width of each antenna and center point coordinate value can be recorded respectively.
Consider that antenna live width is the principal element affecting conductive antenna characteristic, live width is narrow will cause that resistance is too small even causes short circuit, live width is wide will be caused resistance excessive and cause open circuit, therefore first need to carry out quality testing to the live width of each RFID antenna in visual appearance defect inspection process.Wire width measuring unit 504 is for each antenna settings region-of-interest (ROI in detected image, Region OfInterest), and the live width of the average live width measured in this region and standard antenna is made comparisons: if in tolerance, then think that wire width measuring is qualified; Otherwise, judge that this RFID antenna corresponding to zone leveling live width does not meet quality requirements.In industrial practice, generally the position be in residing for antenna to be detected key or concentric wiring and neighbouring selection thereof can be set as region-of-interest, and such as the threshold value not exceeding 5% can be set as acceptable tolerance in RFID antenna manufacturing process, these setting values also can adjust according to concrete technology condition and customer demand certainly.For average live width, after being commonly understood in the art to striped color when user defines antenna pattern and stripe direction, the mean value of all widths of fringe in defined region.
If it is qualified that live width detects, then continue to detect the phenomenon whether antenna exists pattern broken string and/or adhesion.The information such as the length and width about each antenna and center point coordinate value that connected domain analysis unit 505 obtains according to edge detection unit 502, can take out the independent complete image of each antenna respectively from whole detection image.Binary conversion treatment and blob analysis are performed to these single images, the quantity information of its black, white connected domain can be known, and by it compared with black, the white connected domain quantity corresponding to standard antenna: if the quantity of black, white connected domain is equal with standard antenna, then not think to there is pattern broken string adhesion phenomenon; Otherwise, then judge that the RFID antenna corresponding to this single image does not meet quality requirements.Specifically, can also determine pattern broken string or adhesion occur actually according to black, white connected domain quantity separately respectively.Such as, if the number of white connected domain is more than the white connected domain number of standard antenna being carried out to binary conversion treatment and the rear gained of blob analysis in this single image, or the former black connected domain number is less than the black connected domain number corresponding to the latter, then can think that this antenna exists pattern adhesion phenomenon; And for example, if the number of white connected domain is less than the white connected domain number of standard antenna being carried out to binary conversion treatment and the rear gained of blob analysis in this this single image, or the former black connected domain number is more than the black connected domain number corresponding to the latter, then can think that this antenna exists pattern broken string phenomenon.
If pattern broken string adhesion phenomenon do not detected, then can continue to detect antenna and whether there is the phenomenon such as burr and/or printing pollution.So-called burr, refer to because reason is manufactured in etching, printing etc., that causes the one-sided or both sides of lines in antenna plane to occur is raised or sunken, this phenomenon may cause short circuit between antenna lines or short circuit, or having influence on the unit for electrical property parameters of antenna electric resistance, its concrete area or deviation threshold need the kind according to RFID label tag, purposes, size and complexity to determine.So-called printing is polluted, and refers to away outside normal antenna pattern, the unnecessary pattern that substrate presents.In the present invention, utilize connected domain analysis unit 505 to perform this processing step equally.The information such as the length and width about each antenna and center point coordinate value that connected domain analysis unit 505 obtains according to edge detection unit 502, takes out the independent complete image of each antenna respectively from whole detection image.To these single images, first need it to perform matching operation with standard antenna image respectively, and obtain the information such as matching rotation angle; Then, follow two width image subtractions according to match information, and binary conversion treatment and blob analysis are performed to obtained image, clearly can show difference existing between image to be detected and standard antenna image thus: if there is not black region, although or there is black region but its real area is all within tolerance, then not think to there is burr or print and pollute; If there is black region and the real area of this black region exceeds outside tolerance, then record the central point corresponding to this black region, and judge that the RFID antenna corresponding to this single image does not meet quality requirements.More specifically, according to the real area size of described black region, can also judge that this region belongs to burr or prints further and pollute.
In addition, for the ease of practical operation and control, vision inspection apparatus 5 can also comprise display unit 506, and this display unit 506, and can the concrete detection of code of teaching process personnel and content for showing centre and the final detection result of each detecting step above-mentioned.
Below, will specifically describe according to open defect characterization processes process of the present invention.As shown in Figure 2, comprise the following steps according to RFID antenna open defect detection method of the present invention:
First, before taking its RFID antenna within the vision by camera head 1, perform the pre-demarcating steps of camera head.Pre-demarcating steps specifically comprises the image will taken for camera head and sets up pixel coordinate, and converts this pixel coordinate to coordinate figure under same world coordinate system.In addition, if change to some extent compared with parameter when running parameter and upper task, also should re-execute pre-demarcating steps, correct and distort and guarantee to obtain correct test result.
Then, move module 2 make camera head 1 arrive desired locations by operation Three Degree Of Freedom, and by with strip source 3 or coordinating of back light 4 take its one or more image having manufactured RFID antenna within the vision.Captured general image is transferred to vision inspection apparatus 5 by camera head 1, and is gathered by image acquisition unit 502.
Then, for the general image that image acquisition unit 502 gathers, edge detection unit 503 performs rim detection by edge detection operator to it, and will the testing conditions edge center point that also namely rim detection length conforms to standard antenna be met be decided to be the central point of antenna to be detected, and add up same qualified edge center point number, obtain RFID antenna quantity complete in this detected image thus; In addition, according to the coordinate figure demarcating unit 501 conversion acquisition, the information such as the relevant length and width of each antenna and center point coordinate value can also be recorded respectively.
Completing the quantity statistics of antenna to be detected and after obtaining its each self-corresponding positional information, each antenna settings region-of-interest in wire width measuring unit 504 pairs of detected image, and the live width of the average live width measured in this region-of-interest and standard antenna is made comparisons: if in tolerance, then think that wire width measuring is qualified; Otherwise, judge that this RFID antenna corresponding to zone leveling live width does not meet quality requirements.
In addition, antenna can be detected respectively by connected domain analysis unit 505 whether to there is pattern broken string/adhesion and whether there is the phenomenons such as burr/printing pollution: first according to the information such as the length and width about each antenna and center point coordinate value that edge detection unit 502 obtains, from whole detection image, take out the independent complete image of each antenna respectively.To these single images, when needs check pattern broken string/adhesion situation, binary conversion treatment and blob analysis are performed to each image, knows the quantity information of its black, white connected domain thus, and by it compared with black, the white connected domain quantity corresponding to standard antenna.And when needs detect burr/printing pollution condition, then need each image to perform with standard antenna image respectively matching operation, and obtain the information such as matching rotation angle; Then, follow according to match information by two width image subtractions, and binary conversion treatment and blob analysis are performed to obtained image, manifest thus whether to there is burr or print and pollute.
Finally, the testing result of each detecting step above-mentioned can be shown by display unit 506, and the concrete detection of code of teaching process personnel and content.In addition, it should be noted that, the above-mentioned quality inspection steps about aspects such as live width, broken string/adhesion and burr/printing pollutions can carry out the adjustment on order, or only select a part wherein to perform as required, if above defect detected in any link detected, all think that this antenna is defective, and terminate the detection to this antenna.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (1)
1., for performing the method that open defect detects to RFID antenna, it is characterized in that, the method comprises the following steps:
A () is before employing camera head absorbs RFID antenna image to be detected, perform the pre-demarcating steps of camera head, in this operation, the image first will taken for camera head sets up pixel coordinate, then converts this pixel coordinate to coordinate figure under same world coordinate system;
B () moves module by operation Three Degree Of Freedom makes camera head arrive the desired location be positioned at above RFID antenna to be detected, and by this camera head and coordinating between the strip source being symmetricly set on its both sides or the back light being arranged on below RFID antenna to be detected, its general image is taken to multiple RFID antenna to be detected;
General image captured by (c) collection, and rim detection is performed to it, then the testing conditions edge center point that also namely rim detection length conforms to standard antenna will be met be decided to be the central point of antenna to be detected, the edge center point number that statistics meets testing conditions is to obtain the RFID antenna quantity in this detected image, and the coordinate figure simultaneously obtained according to step (a) conversion records the information about length and width and center point coordinate value of each antenna in this general image respectively;
D () performs the open defect detection that these key indexs are polluted in live width, pattern broken string and adhesion, burr and printing successively, in this outward appearance defect inspection process:
(d1) first quality testing is carried out to the live width of each RFID antenna, in this operation, each antenna treated in detected image sets region-of-interest respectively, this region-of-interest is set to the position residing for RFID antenna concentric wiring, then measure the average live width in each region-of-interest and compare with the live width of standard antenna: when fiducial value does not exceed 5% this threshold value of standard antenna live width, think that wire width measuring is qualified, and continue to perform step (d2); Otherwise, then judge that corresponding RFID antenna does not meet live width quality requirements, end operation;
(d2) length and width about each antenna recorded according to step (c) and the information of center point coordinate value, take out the complete image that each RFID antenna is independent from general image; Perform binary conversion treatment and blob respectively to these independent images to analyze with the quantity information knowing its black, white connected domain, then it is compared with black, the white connected domain quantity corresponding to standard antenna: when the quantity of black, white connected domain is all equal with standard antenna, judge there is not image broken string and adhesion defect, and continue to perform step (d3); And when the quantity of white connected domain is less than standard antenna more than the quantity of standard antenna or black connected domain, there is pattern adhesion phenomenon in the RFID antenna corresponding to judgement, end operation; In addition, when the quantity that the quantity of white connected domain is less than standard antenna or black connected domain is more than standard antenna, then judge that corresponding RFID antenna exists pattern broken string phenomenon, same end operation;
(d3) length and width about each antenna recorded according to step (c) and the information of center point coordinate value, take out the complete image that each RFID antenna is independent from general image; These independent images are performed respectively and the matching operation of standard antenna image, and obtain matching rotation angle information; According to match information by two width image subtractions, and perform binary conversion treatment and blob analysis to subtracting each other rear obtained image, then there is situation and area information thereof according to black region, determine whether thus produce burr and/or printing pollute: when there is not black region or there is black region but its real area is within tolerance time, judge do not exist burr and printing pollute; And when there is black region and its real area exceeds outside tolerance, record the central point corresponding to this black region and judge this RFID antenna existing defects corresponding to independent image, then continue the real area size according to black region, judge that belonging to veining defect still prints pollution defect further.
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