CN202304772U - Optical fiber contact pin concentricity measuring system based on vision measuring - Google Patents
Optical fiber contact pin concentricity measuring system based on vision measuring Download PDFInfo
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- CN202304772U CN202304772U CN2011204199764U CN201120419976U CN202304772U CN 202304772 U CN202304772 U CN 202304772U CN 2011204199764 U CN2011204199764 U CN 2011204199764U CN 201120419976 U CN201120419976 U CN 201120419976U CN 202304772 U CN202304772 U CN 202304772U
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- contact pin
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- optical fiber
- shaped groove
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Abstract
The utility model discloses an optical fiber contact pin concentricity measuring system based on vision measuring, which comprises an illumination light source, a V-shaped groove, a transmission device, an optical micro imaging device, a digital image collection card and a computer, wherein the optical fiber contact pin to be measured is placed in the V-shaped groove; the roller wheel of the transmission device lightly presses on the middle of the optical fiber contact pin to be measured, and the optical fiber contact pin to be measured carries out uniform-speed circular motion in the V-shaped groove along with the roller wheel of the transmission device; the illumination light source and the optical micro imaging device are respectively located at two sides of the V-shaped groove, and are just opposite to the axial line of the optical fiber contact pin to be measured in the V-shaped groove; the light emitted by the illumination light source passes through the inner hole of the optical fiber contact pin to be measured and is collected by the optical micro imaging device; and the output end of the optical micro imaging device is connected with the computer by the digital image collection card. The system disclosed by the utility model has the characteristics of being high in measuring efficiency, high in accuracy, and not influenced by subjective vision of measurers.
Description
Technical field
The utility model relates to a kind of vision measuring method, particularly a kind of optical fiber contact pins concentricity measuring system based on vision measurement.
Background technology
Optical fiber contact pins belongs to the passive device of optical fiber, is the basic passive device of the most general and use amount maximum in the optical communication system, is used to realize that the rapid and reliable break-make is connected between optical fiber and equipment, optical fiber and optical fiber, optical fiber and the instrument.Optical fiber contact pins is a kind of right cylinder that has micropore, length L=10.5/6.5mm, diameter D=2.5/1.25mm, micropore inner diameter d=0.125-0.130mm.
At present, the concentricity of optical fiber contact pins adopts manual method evaluation mostly.When pressing classic method measurement and evaluation optical fiber contact pins concentricity by manual work; The testing fiber contact pin is placed a V-shaped groove, gently press the contact pin middle part, adopt the driven by motor roller at the uniform velocity to rotate again with rubber roll; The testing fiber contact pin is along with doing uniform circular motion; Obtain the enlarged image of its endoporus with the video camera of band front end optical microscope then and be presented on the monitor, through in the manual observation contact pin rotary course with respect to the eccentricities of datum line, thereby judge the concentricity scope of contact pin.Adopt this method can only draw a grade of contact pin concentricity, can't provide definite value.This detection method working strength is big, relies on operator's subjective judgement fully, and efficient is low, detects difficult quality guarantee.For the demand of satisfy producing, often take the mode of working extra shifts or extra hours, the reviewer very easily occurs tired under the working method of this dullness, is very easy to cause omission or flase drop.
The utility model content
The utility model technical matters to be solved provides a kind of optical fiber contact pins concentricity measuring system based on vision measurement, and it has the efficiency of measurement height, and precision is high, and measurement result is the characteristics of tested person person's subjective visual effect not.
For addressing the above problem, the utility model is realized through following technical scheme:
A kind of optical fiber contact pins concentricity measuring system based on vision measurement includes lighting source, V-shaped groove, gearing, optical microphotograph imaging device, digital image acquisition card and computing machine; Wherein the testing fiber contact pin places in the V-shaped groove; The roller of gearing gently is pressed in the middle part of testing fiber contact pin, and the roller that the testing fiber contact pin is followed gearing is done uniform circular motion in V-shaped groove; Lighting source and optical microphotograph imaging device lay respectively at the both sides of V-shaped groove, and lighting source, optical microphotograph imaging device all with V-shaped groove in the axis of testing fiber contact pin face; Light that lighting source sends through the endoporus of testing fiber contact pin after by the collection of optical microphotograph imaging device; The output terminal of optical microphotograph imaging device links to each other with computing machine via the digital image acquisition card.
In order the printout of measurement result data output report also to be connected to printer on the output terminal of the said computing machine of such scheme.
Compared with prior art; The advantage, accuracy of detection that the utlity model has untouchable detection is high, noise resisting ability is strong, accurate positioning, good reproducibility, characteristics such as easy and simple to handle; The most important thing is the utility model can be accurately the concentricity of measuring optical fiber contact pin and internal diameter apace, effectively avoided all drawbacks that manual measurement brought.
Description of drawings
Fig. 1 is a kind of structural representation of the optical fiber contact pins concentricity measuring system based on vision measurement;
Fig. 2 is a kind of process flow diagram of the optical fiber contact pins concentricity measuring method based on vision measurement;
The 8 neighborhood synoptic diagram that Fig. 3 is adopted when making an uproar for the image filter;
Fig. 4 is right for the morphology refined structure unit that adopts;
Fig. 5 is the synoptic diagram of minimum boundary rectangle method estimation circle parameter.
Embodiment
Referring to Fig. 1, a kind of optical fiber contact pins concentricity measuring system based on vision measurement mainly is made up of lighting source, V-shaped groove, gearing, optical microphotograph imaging device, digital image acquisition card, computing machine and printer.Lighting source can produce parallel rays.The V-type groove is used to carry the testing fiber contact pin.The testing fiber contact pin places in the V-shaped groove; The roller of gearing gently is pressed in the middle part of testing fiber contact pin, and the roller that the testing fiber contact pin is followed gearing is done uniform circular motion in V-shaped groove.Lighting source and optical microphotograph imaging device lay respectively at the both sides of V-shaped groove, and lighting source, optical microphotograph imaging device all with V-shaped groove in the axis of testing fiber contact pin face; Light that lighting source sends through the endoporus of testing fiber contact pin after by the collection of optical microphotograph imaging device.The output terminal of optical microphotograph imaging device links to each other with computing machine via the digital image acquisition card.The digital image acquisition card is installed in the PCI slot of computing machine.Printer is connected on the output terminal of computing machine.The testing fiber contact pin is placed a V-type groove; Gently press the contact pin middle part by the roller of gearing; Adopt the driven by motor roller of gearing at the uniform velocity to rotate again, the testing fiber contact pin is followed and is done uniform circular motion, and the video camera with band front end optical microscope is the enlarged image that the optical microphotograph imaging device obtains its testing fiber contact pin endoporus then; Convert optical imagery into digital picture by the digital image acquisition card again; Pass through the processing of the automatic process of measurement of concentricity in the computing machine at last, show measurement result, and can the measurement result data be generated form by printer output.
A kind of optical fiber contact pins concentricity measuring method that said system realized based on vision measurement, as shown in Figure 2, it specifically includes following steps:
(1) concentricity is known reference optical fiber contact pin places on the V-shaped groove; Utilize the optical microphotograph imaging device that reference optical fiber contact pin endoporus is carried out to picture; The amplification coefficient and the object distance of adjustment optical microphotograph imaging device make the interior borescopic imaging of contact pin be shown in the contact pin endoporus image border clear-cut on the computer display screen;
(2) the resulting reference optical fiber contact pin of optical microphotograph imaging device endoporus image is sent into digital image acquisition and stick into the row processing, the digital image acquisition card is transferred in the computing machine after converting the endoporus optical imagery into the endoporus digital picture;
The above-mentioned process that converts the endoporus optical imagery into the endoporus digital picture specifically comprises the steps:
(2.1) gray processing is handled: because the optical microphotograph imaging device collects is the BMP format-pattern file of 24 colours, and can there be certain degree of difficulty in its image when directly handling, so first-selection need convert 256 color shade images to by following formula, promptly
Y＝0.299R+0.587G+0.114B ④
In the formula, Y represents the net result of this pixel brightness; R, G, B represent the value of these pixel red, green, blue three looks respectively;
(2.2) image binaryzation is cut apart: in the optical fiber contact pins endoporus image that the optical microphotograph imaging device is obtained between target and the background contrast bigger; And have uniformly intensity profile, confirm that segmentation threshold accomplishes image segmentation so the utility model adopts based on the optimal threshold method of gradation of image characteristic.The basic thought of this method is to find a threshold value T, makes that the erroneous segmentation probability of pressing this threshold value division target and background is minimum, promptly utilizes mathematical statistics knowledge to do dividing processing.
The utility model uses threshold method that the gray level image that step (2.1) is obtained is cut apart, and promptly all gray-scale values all are judged as more than or equal to the pixel of threshold value T and belong to background, and assignment is 1; And belong to target less than the pixel of threshold value T, and assignment is 0, specific algorithm is following:
In the formula, T is a threshold value, and (x y) is the gray-scale value of pixel to f, and (x y) is the value of pixel after the binaryzation to g;
(2.3) image is filtered the processing of making an uproar: the optical fiber contact pins endoporus image that the optical microphotograph imaging device is obtained; Because of adopting the transillumination mode; Only have small amount of noise, the image target area that will handle and background differentiation clearly, simultaneously because be to carry out carrying out image threshold segmentation earlier; Only there is a small amount of isolated noise in resulting bianry image, so image denoising is primarily aimed at the isolated noise of bianry image.
The utility model adopts L neighborhood statistical coding filter window to remove the isolated noise of image, and promptly when the L neighborhood of certain some P0 on the image satisfied following formula, then this was an isolated noise point, with its filtering;
In the formula, P
iThe value of representing i pixel in this neighborhood; L representes the neighborhood number, L=k * k-1, and the span of L should be appropriate, and the too small precision of value is uncontrollable, and value is excessive then can to increase operand, generally gets 1＜k≤9.
In the utility model preferred embodiment, said L=8, employing 8 neighborhood statistical coding filter windows promptly as shown in Figure 3 are removed the isolated noise of image.
(3) computing machine extracts the reference optical fiber contact pin endoporus digital picture edge that step (2) obtains, and obtains endoporus image outline data; Yet adopt minimum boundary rectangle method estimation endoporus central coordinate of circle position and diameter, the center of circle and the diameter of endoporus confirmed in the hunting zone that dwindles the Hough transformation of accurate round parameter detecting according to the estimation data of gained again;
The process of above-mentioned endoporus digital picture edge extracting specifically comprises the steps:
(3.1) original image is carried out erosion operation, obtain the image behind the erosion operation and preserve;
(3.2) calculate the difference of original image and erosion operation gained image, can detect the edge of endoporus;
(3.3) endoporus edge contour refinement because the accuracy of detection that the utility model method is had relatively high expectations so lay particular emphasis on the accurate of location to contact pin endoporus edge of image detection algorithm, requires the true edge of not omission, does not produce false edge simultaneously.Therefore the utility model also needs further to adopt after having carried out the digital picture edge extracting based on hitting/the morphology thinning algorithm of miss conversion (HMT) refinement of bore edges in realizing.That is:
(3.3.1) choose N structural elements is carried out refinement, wherein N is 2 integral number power, 2≤N≤64; In the utility model preferred embodiment, choose 8 pairs of structural elements; Referring to Fig. 4, each centering B1 is made up of 4 points, and B2 then is made up of 3 points; As shown in Figure 5; Wherein " 1 " and " 0 " is respectively the element among B1 and the B2, and " 1. " represented the reference center point simultaneously, " 1 " expression target pixel points; " 0 " expression background pixel point, the pixel of " X " expression is value arbitrarily;
(3.3.2) open up the target pixel points that buffer records has made marks;
(3.3.3) by from left to right, from top to bottom order begins to scan entire image;
If (3.3.4) current location is a target pixel points, execution in step (3.3.5) down, otherwise continue the next pixel of scanning;
(3.3.5) with the L neighborhood of target pixel points successively with N structural elements to coupling, in the utility model preferred embodiment, with 8 neighborhoods of target pixel points successively with 8 structural elements to coupling; If mate wherein any one, the expression object pixel is hit by structural elements, and its mark is gone into buffer zone and continued the next pixel of scanning; If with 8 structural elements to all not matching, then continue the next pixel of scanning;
(3.3.6) when accomplishing single pass, check buffer zone, all pixels that will wherein write down are successively deleted from image, promptly are changed to background pixel; With the buffer zone zero clearing, change step (3.3.3) and begin scanning process next time then; If the inspection buffer zone be empty, the pixel that will do not deleted of expression then, image thinning completion this moment.
Above-mentioned Hough transformation circle parameter detecting step is specially: adopt " minimum boundary rectangle method " that the contact pin endoporus is slightly gone on foot the location earlier; Estimate its radii size and central coordinate of circle position; Confirm the hunting zone that the Hough transformation circle detects on this basis; This method has been avoided in the entire image scope, carrying out conversion and the spending of increase time, thereby has improved detection efficiency.Fig. 5 is " minimum boundary rectangle method " estimation circle parameter synoptic diagram, the wherein center of circle
Radius
(4) utilize following formula to calculate the pixel equivalent k of said measuring system, promptly
k＝D’/D ①
In the formula, D is the diameter of bore of known reference optical fiber contact pins; D ' calculates the contact pin diameter of bore in the step (3);
(5) the tested optical fiber contact pin is placed on the described V-shaped groove of step (1), and let the roller of gearing gently be pressed in the middle part of tested optical fiber contact pin; Afterwards, start the roller that gearing follows on the gearing by the testing fiber contact pin and in V-shaped groove, do uniform circular motion;
(6) in the motion process of tested optical fiber contact pin, utilize the optical microphotograph imaging device that tested optical fiber contact pin endoporus is carried out n imaging, wherein the value of n is by systemic presupposition, 10≤n≤20; Be transferred in the computing machine after converting said n width of cloth endoporus optical imagery into n width of cloth endoporus digital picture through the digital image acquisition card successively;
In the utility model, the optical microphotograph imaging device adopts the method for isochronic interval in one week of motion or the process more than the week of tested optical fiber contact pin, carries out n imaging.
(7) computing machine adopts the described method of step (3) to confirm the center of circle O of n width of cloth endoporus image successively
n(x
n, y
n) and inside diameter D
n, and to deposit them in two arrays respectively be among O [n] and the D [n];
Be transferred in the computing machine through the digital image acquisition card like first width of cloth endoporus image; Be converted into gray level image; The binaryzation of carrying out the endoporus image is again cut apart, and the isolated noise of last filtering image adopts the described method of step (3) to confirm the center of circle O of first width of cloth endoporus image afterwards
1(x
1, y
1) and diameter D
1, deposit in respectively among two array O [n] and the D [n], meanwhile the digital image acquisition card is transferred to computing machine with second width of cloth endoporus image; Repeat above-mentioned steps, until the center of circle O that accomplishes n width of cloth contact pin endoporus image
n(x
n, y
n), diameter D
nCalculating and storage.
(8) computing machine calculate according to following formula the testing fiber contact pin concentricity e and diameter of bore mean value
promptly
e＝max(d
i)×k，i＝1，2，3，·m ②
In the formula, k is the pixel equivalent of measuring system; d
1, d
2, d
3,, d
mBe respectively the distance between any two centers of circle in step (7) the gained n width of cloth endoporus image; General m value
Here
Be combinatorial operation, n is identical with n in the step (6); Because the center of circle and diameter that step (7) is calculated and stored respectively have
Individual, therefore the maximum occurrences scope of the number m of the distance between any two centers of circle equals
(promptly get 2, do not arrange) from n element.And the value of m is big more; The concentricity e that is obtained and the mean value of diameter of bore
are accurate approximately, but correspondingly operand also can increase.In the utility model preferred embodiment, the span of said m is 20≤m≤100.
Claims (2)
1. the optical fiber contact pins concentricity measuring system based on vision measurement is characterized in that: include lighting source, V-shaped groove, gearing, optical microphotograph imaging device, digital image acquisition card and computing machine; Wherein the testing fiber contact pin places in the V-shaped groove; The roller of gearing gently is pressed in the middle part of testing fiber contact pin, and the roller that the testing fiber contact pin is followed gearing is done uniform circular motion in V-shaped groove; Lighting source and optical microphotograph imaging device lay respectively at the both sides of V-shaped groove, and lighting source, optical microphotograph imaging device all with V-shaped groove in the axis of testing fiber contact pin face; Light that lighting source sends through the endoporus of testing fiber contact pin after by the collection of optical microphotograph imaging device; The output terminal of optical microphotograph imaging device links to each other with computing machine via the digital image acquisition card.
2. a kind of optical fiber contact pins concentricity measuring system based on vision measurement according to claim 1 is characterized in that: also be connected to printer on the output terminal of said computing machine.
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| CN2011204199764U CN202304772U (en) | 2011-10-28 | 2011-10-28 | Optical fiber contact pin concentricity measuring system based on vision measuring |
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| CN2011204199764U CN202304772U (en) | 2011-10-28 | 2011-10-28 | Optical fiber contact pin concentricity measuring system based on vision measuring |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519398A (en) * | 2011-10-28 | 2012-06-27 | 广西师范大学 | Optical fiber base pin concentricity measuring method based on visual measurement and system thereof |
| CN107340604A (en) * | 2017-07-01 | 2017-11-10 | 北京曙光明电子光源仪器有限公司 | A kind of concentric glass correcting device for concentricity and its application method |
-
2011
- 2011-10-28 CN CN2011204199764U patent/CN202304772U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519398A (en) * | 2011-10-28 | 2012-06-27 | 广西师范大学 | Optical fiber base pin concentricity measuring method based on visual measurement and system thereof |
| CN102519398B (en) * | 2011-10-28 | 2013-08-28 | 广西师范大学 | Optical fiber base pin concentricity measuring method based on visual measurement and system thereof |
| CN107340604A (en) * | 2017-07-01 | 2017-11-10 | 北京曙光明电子光源仪器有限公司 | A kind of concentric glass correcting device for concentricity and its application method |
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Granted publication date: 20120704 Termination date: 20121028 |