CN209623633U - A kind of diameter measuring device of high reflective cylindrical body - Google Patents
A kind of diameter measuring device of high reflective cylindrical body Download PDFInfo
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- CN209623633U CN209623633U CN201920550007.9U CN201920550007U CN209623633U CN 209623633 U CN209623633 U CN 209623633U CN 201920550007 U CN201920550007 U CN 201920550007U CN 209623633 U CN209623633 U CN 209623633U
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Abstract
The utility model discloses a kind of diameter measuring devices of high reflective cylindrical body, including the bracket that cylindrical body radially opposite sides to be measured are arranged in, the level board being arranged on bracket, the image collecting device for being shot to cylindrical body to be measured being arranged on level board and the computer for receiving image collecting device data, its technical solution is that: cylindrical body to be measured is arranged in for the axial mobile mechanism for moving horizontally the cylindrical body to be measured；The mobile mechanism includes V-type conveyer belt for placing cylindrical body to be measured and drives cylinder axis to be measured to the driving motor moved horizontally for driving V-shaped conveyer belt；Computer is connect by data line with driving motor, for controlling the start and stop of driving motor.The utility model has structure simple, the advantage that measurement is quick, result is accurate.
Description
Technical field
The utility model relates to Computer Vision Detection fields, are to be related to the high reflective cylindrical body of vision measurement specifically
Technical field.
Background technique
There is the part of many cylindrical bodies in the industrial production, and wherein there are numerous parts all is that metal manufactures, and is had
The metal film of Smooth is plated, outside cylindrical body also to reach anticorrosive, anti-the purpose of getting rusty, is beautiful.With the development of science and technology
And progress, there is increasingly harsher requirement for the diameter machining accuracy of these cylindrical bodies.Equally, how effectively accurately
The diameter for measuring these cylindrical parts is also more and more important.These parts are generally unsuitable for conventional contact measurement method
Measurement, because inevitably abrasion even damage metal film can be caused to metal coating during contact type measurement, thus
To the effect of metal film.So high precision non-contact measurement technology is particularly important.Opposite traditional measurement is examined
Method, it is contactless, quick, accurate and intelligentized that the measurement of optical visual technology has the advantages that.High reflective cylindrical body is due to itself
Reflection characteristic, cannot achieve accurate measurement with common optical measuring system, and telecentric optics measuring system can be very big
Reduce marginal error in degree, eliminates the influence of object distance variation, effectively improve the optical imagery matter of machine vision measuring system
Amount, improves the precision of measurement.By telecentric optics imaging system, complicated automatic focusing in real time system can have both been saved, had been reduced
The difficulty of software design, but can overcome well as object under test is irregular and caused by image blur and the measurement that generates
Error, particularly suitable for measuring the diameter that there is certain thickness object or measure cylindrical body.
Utility model content
The purpose of this utility model is to provide a kind of diameter measuring devices of high reflective cylindrical body, have measurement fast
The accurate advantage of speed, result.
A kind of high reflective cylinder diameter measuring device, the branch including cylindrical body radially opposite sides to be measured are arranged in
Frame, the level board being arranged on bracket, the image collector for being shot to cylindrical body to be measured being arranged on level board
It sets and the computer for receiving image collecting device data, its technical solution is that: cylindrical body setting to be measured is being used for axis
To in the mobile mechanism for moving horizontally the cylindrical body to be measured；The mobile mechanism includes transmitting for placing the V-type of cylindrical body to be measured
Band and drive cylinder axis to be measured to the driving motor moved horizontally for driving V-shaped conveyer belt；Computer by data line with
Driving motor connection, for controlling the start and stop of driving motor.
Have the beneficial effect that the utility model controls V-type conveyer belt by computer and at the uniform velocity transports brought by the utility model
Dynamic, when cylindrical body to be measured moves in acquisition range, the industrial camera being connected with computer is acquired in real time on cylindrical body to be measured
Edge image information is stored in computer, to be collected to after entire object under test information, by image processing algorithm, obtains to be measured
Article diameters realize the measurement to the high-precision of cylindrical body, high efficiency, high stability.Adjustable position is housed on A-frame
The cylinder set, so that device can be adapted for measuring various sizes of cylindrical body.The utility model structure is simple, measurement method mistake
Journey is few, and operand is small, has the advantages that measurement is quick, result is accurate.
Detailed description of the invention
Fig. 1 is the structure chart of the utility model.
Fig. 2 is the left view of Fig. 1.
Fig. 3 is the right view of Fig. 1.
Fig. 4 is the measuring principle figure that cylinder diameter is measured using V-groove.
Fig. 5 is V-type belt-driven schematic diagram.
Fig. 6 is marginal point and its pixel schematic diagram.
Fig. 7 is the neighbor pixel schematic diagram in 135 ° of directions.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are under that premise of not paying creative labor
Every other embodiment obtained, fall within the protection scope of the utility model.
Specific embodiment I: such as Fig. 1~5, a kind of high reflective cylinder diameter measuring device, its technical solution is that: including
Left tripod 8, right tripod 4, the mounting plate 1 being horizontally set between left tripod 8, right tripod 4 and setting are on a left side three
The adjustment mechanism for being used to adjust 1 both ends distance to the ground of mounting plate on foot prop 8 and/or right tripod 4；Wherein, it is set on mounting plate 1
It is equipped with industrial camera 2 that can be mobile with mounting plate 1；The industrial camera 2 is connected by data line with computer 9.Adjustment mechanism
Including the left cylinder 11 and right cylinder 10 being separately positioned on left tripod 8 and right tripod 4；The left cylinder 11 and right cylinder
10 are connected by data line with computer 9.Cylindrical body to be measured is arranged in for the axial shifting for moving horizontally the cylindrical body to be measured
On motivation structure；The mobile mechanism is arranged between left tripod 8, right tripod 4, including the V-type for placing cylindrical body to be measured
Conveyer belt 7 and drive cylinder axis to be measured to the driving motor 12 moved horizontally for driving V-shaped conveyer belt 7；Computer 9 passes through
Data line is connect with driving motor 12, for controlling the start and stop of driving motor 12.
Wherein, the V-type conveyer belt 7 is that the side of contact measured cylindrical body is provided with V-groove；The opposite side of V-groove
It is provided with rack gear B；The output end of driving motor 12 is connected with gear A；The gear A is engaged with the rack gear B on V-type conveyer belt 7；By
Driving motor 12 controls V-type conveyer belt 7 and at the uniform velocity moves.
The level of left cylinder 11 and the adjustable mounting plate 1 of right cylinder 10 or away from ground distance, for being suitble to multiple diameter
The reflective cylindrical measurement of height.
The effect of each section is:
1, mounting plate 1, mounting plate 1 be there is certain machining accuracy mounting plate 1 is arranged in parallel, for fixing industrial camera
2, telecentric lens 3 and collimated backlight source 5 are mounted on left tripod 8 and right tripod 4, can be in left cylinder 11 and right gas
Height off the ground is adjusted under the driving of cylinder 10；
2, industrial camera 2: being fixed on mounting plate 1, and the selection of the industrial camera 2 is selected according to lens parameters, output side
Formula be Gig gigabit Ethernet output, interface be it is consistent with 3 interface of telecentric lens of selection, communicated with 9 host of computer.
3, telecentric lens 3: select doubly telecentric camera lens, entrance pupil aperture, enlargement ratio, the depth of field, operating distance, telecentricity,
Aberration rate, camera interface select suitable camera lens according to cylinder diameter to be measured；
4, right tripod 4, size and left tripod 8 are consistent.
5, collimated backlight source 5: being fixed on mounting plate 1, selects suitable size according to telecentric lens 3.
6, cylindrical body 6 to be measured, is placed on V-groove conveyer belt 7.
7, V-groove conveyer belt 7 is placed between right tripod 4 and left tripod 8, for placing cylindrical body to be measured, In
It moves with uniform velocity under the driving of driving motor 12.
8, computer 8 are connected with industrial camera 2, driving motor 12, and are equipped with measuring system, control driving motor 12
Driving V-shaped slot conveyer belt 7 moves with uniform velocity, and is connected with industrial camera 2, carries out image procossing to the picture of acquisition, and justified
The diameter calculation of cylinder.
9, right cylinder 10 are mounted on right tripod 4, the height with the mating common adjustment mounting plate 1 of left cylinder 11, make this
Application can measure various sizes of cylinder diameter.
10, left cylinder 11 are mounted on left tripod 8, and the height with the mating common adjustment mounting plate 1 of right cylinder 10 makes
The application can measure various sizes of cylinder diameter.
The measurement process of high reflective cylinder diameter measuring device as described above is:
S1, mounting plate 1 is horizontally set on bracket；
S2, image collecting device is fixed on mounting plate 1, and is communicated with computer 9；
S3, cylindrical body to be measured are placed on V-groove conveyer belt 7；
S4, V-groove conveyer belt 7 drive cylindrical body axial direction uniform motion to be measured；
S5, computer 9 acquire the data of image collecting device output, obtain the diameter of cylindrical body to be measured.
Processing carried out to acquired image finally obtain the process of the reflective cylinder diameter of height to be measured be:
One) measurement model is established
Cylindrical body to be measured is placed on V-groove, as shown in figure 4, difference body diameter Δ D causes different difference in height Δ h,
Corresponding relational expression are as follows:
Wherein, θ is the half of V-groove angle, and k is Δ D and the relevant coefficient of first order of Δ h.
Existing relational expression between the edge pixel difference Δ H and actual height difference Δ h of two cylinders of Image Acquisition are as follows:
Δ h=k1*ΔH+k2 (2)
By between the practical column pixel difference Δ H and two cylinder real radius difference Δ D of available two circle of formula (1) and (2)
Relational expression:
Δ D=A1*ΔH+A2 (3)
Wherein, A1And A2Specific value can be determined by system calibrating.
As known diameter D0The top edge picture position H of cylinder0, according to above-mentioned measuring principle, by the top of any cylinder
Edge imaging position H can solve its diameter D:
D=D0+A1*(H-H0)+A2 (4)
Two) calibration system parameter
Acquire multiple known diameter DiCylinder top edge, obtain its corresponding image pixel location information Hi, obtain a system
The Δ D of columniWith Δ Hi, it is available about A to bring formula (3) into1And A2Equation group, using least square method to parameter carry out
It solves, thus the system parameter demarcated.
Three) image pixel location information is extracted
Cylinder top edge image is acquired, image procossing is followed the steps below to the image of acquisition, extracts image pixel
Location information.
1. converting gray level image for original image.
Edge detection is carried out to gray level image using classical edge detection algorithm-Canny algorithm, obtains cylinder top edge
Contour line.
2. utilizing improved conic fitting method, edge detection is carried out, sub-pixel edge is obtained.
3. being carried out curve fitting using the analysis of main elements to edge contour line.
Specifically, improved conic fitting method:
The gray-value variation of image border is into Gaussian Profile, and the apex coordinate value of Gaussian curve corresponds to target image
The exact position of edge pixel point.
The expression formula of dimensional Gaussian curve are as follows:
In formula, μ is mean value, and σ is standard deviation.
Logarithm is taken to formula (5) both sides, available:
This is the conic section about x, and using taking the value after logarithm to carry out Parabolic Fit, it is parabolical then to find out this
Apex coordinate, and then find out the coordinate on Gaussian curve vertex.
If the form of conic section are as follows:
v*=Ax2+Bx+C (7)
The output valve of each pixel are as follows:
The serial number 0 of difference value maximum point is enabled, the gray value f of this point0It indicates, its value is found out using Canny operator,
Use -1 and 1 indicates the serial number of the two neighboring point of difference value maximum point respectively, corresponding gray value f-1And f1It indicates, it can
Find out the gray value of three pixels output are as follows:
It can equally obtain,
By formula 9~11, the expression formula of A, B, C can contact are as follows:
Vertex of a parabola abscissa value isBy the available parabolical apex coordinate of formula (12):
The grey scale pixel value of formula 13 is replaced with logarithm to get the expression formula of sub-pixel edge extraction has been arrived:
The adjacent pixel of marginal point is pressed 4 directions and is centered around around marginal point, i.e. 0 ° of direction, 45 ° of directions, 90 ° of directions
With 135 ° of directions.The neighbor pixel of marginal point and marginal point indicates as shown in Figure 6.Improved curve used by this patent is quasi-
Sub-pixel edge detection method is closed when carrying out edge positioning, is chosen using 135 ° of directional diagrams 7, i.e. f1And f-1It is corresponding
Be respectively f (i-1, j-1) and (i+1, j+1).
The analysis of main elements:
The analysis of main elements calculation basis constructs covariance matrix:
Wherein cov (x, y) etc. is all kinds of binary covariances of outline data, solves the characteristic value and feature vector of C, finds it
In the corresponding feature vector of the smallest characteristic value, as want the normal vector of fitting a straight lineCenter point coordinate is brought into directly
Line equation n1x+n2Y+d=0 can determine the 3rd component of linear equation.
Four) implementation process
1. carrying out system parameter calibration first after high reflective cylinder diameter measuring device is installed.Acquire it is multiple
The cylinder top edge for knowing diameter, the sub-pixel edge of cylinder top edge is extracted by method described in above-mentioned three, and uses host element
Analytic approach is fitted, and obtains a series of diameter value and pixel value, brings the available equation about A1 and A2 of formula (3) into
Group solves parameter using least square method, thus the system parameter demarcated.System parameter is stored in computer
Measuring system, and by the measuring system of the diameter of wherein one group of standard cylinder and pixel value deposit computer.
2. measuring cylinder diameter.Open computer 9, industrial camera 2, driving motor 12 etc..V-type is controlled with computer 1
Slot conveyer belt 7 makees uniform motion, and industrial camera 2 acquires picture with certain frequency.The picture of 9 pairs of computer acquisitions carries out at image
Reason, the sub-pixel edge of cylinder top edge is extracted according to method described in above-mentioned three, and is stored, complete circle to be collected
After the top edge information of column, it is fitted according to the analysis of main elements described in above-mentioned steps three.And then utilize deposit computer
The diameter and pixel value of measuring system Plays cylinder bring formula (4), the body diameter measured into.
The foregoing is merely the preferred embodiment of utility model, oneself, is not intended to limit the utility model, all in this reality
With made any modifications, equivalent replacements, and improvements within novel spirit and principle etc., the utility model should be included in
Within protection scope.
Claims (4)
1. a kind of high reflective cylinder diameter measuring device, including the bracket of cylindrical body radially opposite sides to be measured is arranged in, setting exists
It level board on bracket, the image collecting device for being shot to cylindrical body to be measured being arranged on level board and is used for
Receive the computer (9) of image collecting device data, it is characterised in that: cylindrical body setting to be measured is moving horizontally this for axial
In the mobile mechanism of cylindrical body to be measured；
The mobile mechanism includes V-type conveyer belt (7) for placing cylindrical body to be measured and drives for driving V-shaped conveyer belt (7)
Cylinder axis to be measured is to the driving motor (12) moved horizontally；
Computer (9) is connect by data line with driving motor (12), for controlling the start and stop of driving motor (12).
2. a kind of high reflective cylinder diameter measuring device according to claim 1, it is characterised in that: V-type conveyer belt (7)
V-type face opposite side be provided with rack gear；The output end of driving motor (12) is provided with corresponding with the rack gear on V-type conveyer belt (7)
Gear.
3. a kind of high reflective cylinder diameter measuring device according to claim 1, it is characterised in that: including left tripod
(8), right tripod (4), the mounting plate (1) that is horizontally set between left tripod (8), right tripod (4) and it is arranged on a left side
The adjustment mechanism for being used to adjust mounting plate (1) both ends distance to the ground on tripod (8) and/or right tripod (4)；
Wherein, industrial camera (2) that can be mobile with mounting plate (1) is provided on mounting plate (1)；The industrial camera (2) passes through
Data line is connected with computer (9).
4. a kind of high reflective cylinder diameter measuring device according to claim 3, it is characterised in that: adjustment mechanism includes
The left cylinder (11) and right cylinder (10) being separately positioned on left tripod (8) and right tripod (4)；The left cylinder (11) and
Right cylinder (10) is connected by data line with computer (9).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920550007.9U CN209623633U (en) | 2019-04-22 | 2019-04-22 | A kind of diameter measuring device of high reflective cylindrical body |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920550007.9U CN209623633U (en) | 2019-04-22 | 2019-04-22 | A kind of diameter measuring device of high reflective cylindrical body |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109945792A (en) * | 2019-04-22 | 2019-06-28 | 洛阳德晶智能科技有限公司 | A kind of diameter measuring method, device and the application method of high reflective cylindrical body |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109945792A (en) * | 2019-04-22 | 2019-06-28 | 洛阳德晶智能科技有限公司 | A kind of diameter measuring method, device and the application method of high reflective cylindrical body |
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