CN109000569A - A kind of thickness measurement system and its measurement method based on camera - Google Patents
A kind of thickness measurement system and its measurement method based on camera Download PDFInfo
- Publication number
- CN109000569A CN109000569A CN201810704076.0A CN201810704076A CN109000569A CN 109000569 A CN109000569 A CN 109000569A CN 201810704076 A CN201810704076 A CN 201810704076A CN 109000569 A CN109000569 A CN 109000569A
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- China
- Prior art keywords
- straight
- bar
- phase unit
- idler wheel
- thickness
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/002—Measuring arrangements characterised by the use of optical techniques for measuring two or more coordinates
Abstract
The invention discloses a kind of thickness measurement system and its measurement method based on camera, the second straight-bar arranged in a crossed manner including the first straight-bar and with the first straight-bar, first straight-bar one end is equipped with the first idler wheel, the other end is equipped with phase unit, the phase unit is equipped with camera lens, the phase unit connects setting industrial computer by data line, second straight-bar is equipped with the second idler wheel in one end corresponding with the first idler wheel, other end setting flag point at position corresponding with phase unit, first straight-bar are connect with the central movable of the second straight-bar.The beneficial effects of the present invention are: 1) use lever-type structure, the straight-bar length of measurement end is lengthened, thickness measurements can be amplified, substantially increase measurement accuracy；2) mark point change in location is acquired using phase unit, the method for being then scaled actual (real) thickness further increases measurement accuracy while ensure that automatic measurement property.
Description
Technical field
The present invention relates to electronic metering equipment technical fields, and in particular to a kind of thickness measurement system based on camera and
Its measurement method.
Background technique
With the high speed development of technology, the demand to precision instrument equipment is growing, and just because of this, fields of measurement is continuous
The measuring device of high-precision, low cost is developed, with the development for military equipment.
Existing measurer for thickness, precision cannot be ensured well, and in dynamic measurement process, often without
Method plays measurement function；The measuring device of precision optics formula is widely used in high-precision thickness fields of measurement, still, cost mistake
In high, cost is excessively high.
Summary of the invention
Aiming at the problems existing in the prior art, it is based on taking the photograph the present invention provides the high one kind of structurally reasonable, measurement accuracy
As the thickness measurement system and its measurement method of head.
Technical scheme is as follows:
A kind of thickness measurement system based on camera, which is characterized in that intersect including the first straight-bar and with the first straight-bar
The second straight-bar being arranged, first straight-bar one end are equipped with the first idler wheel, and the other end is equipped with phase unit, and the phase unit is equipped with
Camera lens, the phase unit connect setting industrial computer by data line, and second straight-bar is corresponding with the first idler wheel one
End is equipped with the second idler wheel, other end setting flag point at position corresponding with phase unit, first straight-bar and the second straight-bar
Central movable connection, thus constitute scissors fork structure.
A kind of thickness measurement system based on camera, which is characterized in that close to the on first straight-bar
The side of one idler wheel is equipped with spring tensioning means, and described spring tensioning means one end is connected with the first straight-bar, the other end and second
Straight-bar is connected.
A kind of thickness measurement system based on camera, which is characterized in that the spring tensioning means, including bullet
Spring, the first connector and the second connector, the both ends of the spring are flexibly connected with the first connector and the second connector respectively,
First connector is fixed on the side that the first straight-bar is equipped with the first idler wheel, and the second connector is fixed on the installation of the first straight-bar
There is the side of the second idler wheel.
A kind of thickness measurement system based on camera, which is characterized in that the phase unit sorts according to array.
A kind of measurement method of the thickness measurement system based on camera, which comprises the steps of:
1): not placing measured object, two idler wheels is made to contact, at this time using the acquisition of Industrial Computer Control phase unit
Label point image, seek the mass center in mark point region, as measurement origin O；
2): placing measured object, clamp measured object using idler wheel, acquire every frame using Industrial Computer Control phase unit again
Image seeks the mass center in mark point region, the measurement coordinate (x as the i-th framei,yi)；
3): mark point is big in the image acquired when not placing measured object according to the actual size and step 1) of mark point
It is small, carry out conversion of the image coordinate system to world coordinate system, transformational relation are as follows:
Wherein, j, k are level, the length of vertical direction that camera acquires mark point in image；M, N be mark point it is horizontal,
The physical length of vertical direction, (Xi,Yi) it is under world coordinate system to measurement coordinate (x under image coordinate systemi,yi) transformation sit
Mark；
4): every frame image being handled, the displacement of mark point in the picture is denoted as l, according to the transformational relation of step 3)
Obtaining this section of actual displacement isAccording to positional relationship it is found that the angle of two straight-bars at this time are as follows:
Wherein, lxFor phase unit to the distance of two straight-bar tie points；A is throwing of the phase unit central region on the second straight-bar
Shadow to two straight-bar tie points distance；
A in above formula can be obtained according to actual displacement L and corresponding positional relationship:
Wherein, lbFor mark point to the distance of two straight-bar tie points；
According to the angle α of two straight-barsiIt can obtain the thickness of measured object:
Wherein, lgFor idler wheel to the distance of two straight-bar tie points；R is the radius of two idler wheels；
5): when measurement dynamic thickness, using industrial computer by thickness diThe Drawing of Curve changed over time comes out；Measurement
When static angular, to improve accuracy rate, using industrial computer to the thickness d within the scope of certain timeiTake mean value as final
Thickness.
The beneficial effects of the present invention are: 1) use lever-type structure, the straight-bar length of measurement end is lengthened, thickness can be amplified
Measured value substantially increases measurement accuracy；2) mark point change in location is acquired using phase unit, is then scaled actual (real) thickness
Method further increase measurement accuracy while ensure that automatic measurement property；3) idler wheel setting as measurement end is used
Meter, in conjunction with spring tensioning means, good stickiness improves precision, and this structure can be used for the dynamic measurement of thickness, utilize
Rolling of the idler wheel on tested direction can obtain the thickness profiles that this side up by processing, and measurement process is convenient, real
It is strong with property；4) phase unit is used, the data that collection analysis obtains are more true and reliable.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention；
Fig. 2 is spring tensioning means structural schematic diagram of the present invention；
Fig. 3 is that camera of the present invention acquires image simplified schematic diagram；
Fig. 4 is size positions relation schematic diagram of the present invention；
In figure: the first idler wheel of 1-, the second idler wheel of 2-, the first straight-bar of 3-, the second straight-bar of 4-, 5- spring tensioning means, 6- phase
Unit, 7- camera lens, 8- industrial computer, 9- spring, the first connector of 10-, the second connector of 11-, 12- mark point.
Specific embodiment
Below in conjunction with Figure of description, the invention will be further described.
As shown in Figs 1-4, a kind of thickness measurement system based on camera, including the first idler wheel 1, the second idler wheel 2, first
Straight-bar 3, the second straight-bar 4, spring tensioning means 5, phase unit 6, camera lens 7, industrial computer 8, spring 9, the first connector 10,
Two connectors 11 and mark point 12.
As shown in Figure 1, a kind of thickness measurement system based on camera is straight including the first idler wheel 1, the second idler wheel 2, first
Bar 3, the second straight-bar 4, spring tensioning means 5, phase unit 6, camera lens 7 and industrial computer 8, the center of the first idler wheel 1 are installed on
One end of first straight-bar 3, and the first idler wheel 1 can be fixed with phase unit 6 around idler wheel center rotating, the other end of the first straight-bar 3, and
And phase unit 6 is configured with camera lens 7,6 sight of phase unit is directed toward 4 surface of the second straight-bar.One end of second straight-bar 4 is equipped with second
Idler wheel 2, identical as the first idler wheel 1, the second idler wheel 2 can also be around center rotating.In the center of first straight-bar 3 and the second straight-bar 4
The heart links together, and can rotate, and constitutes lever construction, one end that described two straight-bars are equipped with idler wheel is placed in one
Side, and linked together using spring tensioning means 5.According to the direction of visual lines of phase unit 6, in the second straight-bar 4 towards phase unit 6
That surface on, a mark point 12 is set, guarantee mark point 12 phase unit 6 within sweep of the eye.Phase unit 6 and industry
Computer 8 is electrically connected, and industrial computer 8 can control phase unit 6 to work, and the image data that phase unit 6 acquires passes industrial calculating back
Machine 8 is handled.
As shown in Fig. 2, spring tensioning means 5 mentioned above are by 11 structure of spring 9, the first connector 10 and the second connector
At the both ends of spring 9 link together with the first connector 10, the second connector 11 respectively, and the first connector 10 and second connects
Fitting 11 can rotate, and when adapting to two straight-bar foldings, direction of pull is constant in spring 9, and two connectors are fixed respectively
On two straight-bar surfaces, fixed position is equipped with the side of idler wheel in straight-bar.When without measurement, under the pulling force of spring 9, two
A idler wheel contacts；When measurement, two straight-bars are pulled open, measured object is clamped under the effect of spring 9.
The measurement method of thickness measurement system based on machine vision, steps are as follows:
Step 1: not placing measured object, and two idler wheels is made to contact, and controls phase unit 6 using industrial computer 8 and adopts
12 image of mark point of collection at this time, dotted outline as shown in Figure 3 seek the mass center in 12 region of mark point, as measurement origin
Coordinate O.
Step 2: placing measured object, clamps measured object using idler wheel, controls phase unit 6 using industrial computer 8 again and adopts
Collect every frame image, solid outline as shown in Figure 3 seeks the mass center in 12 region of mark point, the measurement coordinate (x as the i-th framei,
yi)。
Step 3: mark point 12 in the image acquired when not placing measured object according to the actual size of mark point 12 and step 1
Size, carry out conversion of the image coordinate system to world coordinate system, transformational relation are as follows:
Wherein, j, k are level, the length of vertical direction that camera acquires mark point 12 in image；M, N is 12 water of mark point
Flat, vertical direction physical length, (Xi,Yi) it is under world coordinate system to measurement coordinate (x under image coordinate systemi,yi) transformation
Coordinate.
Step 4: handling every frame image, as shown in figure 3, the displacement of mark point 12 in the picture at this time is l, according to
The transformational relation of step 3 obtains this section of actual displacementAccording to the positional relationship of Fig. 4 it is found that the folder of two straight-bars at this time
Angle are as follows:
Wherein, lxFor the distance of 6 to two straight-bar tie point of phase unit；A is 6 central region of phase unit on the second straight-bar 4
Projection to two straight-bar tie points distance.
A in above formula can be obtained according to the positional relationship in actual displacement L and Fig. 4:
Wherein, lbFor the distance of 12 to two straight-bar tie point of mark point；
According to the angle α of two straight-barsiIt can obtain the thickness of measured object:
Wherein, lgFor idler wheel to the distance of two straight-bar tie points；R is the radius of two idler wheels.
Step 5: when measurement dynamic thickness, using industrial computer 8 by thickness diThe Drawing of Curve changed over time comes out；
When measuring static angular, to improve accuracy rate, using industrial computer 8 to certain time range (the acquisition frequency of this and video camera
Rate is related, and the frequency acquisition of video camera is higher, and in same time, recording a demerit for obtaining is more, and time range can be shorter.Such as
The video camera in this laboratory is 120HZ, therefore is only needed in 0.5-1s.) in thickness diTake mean value as final thickness
Degree.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (5)
1. a kind of thickness measurement system based on camera, which is characterized in that including the first straight-bar (3) and with the first straight-bar (3)
Second straight-bar (4) arranged in a crossed manner, described first straight-bar (3) one end are equipped with the first idler wheel (1), and the other end is equipped with phase unit (6),
The phase unit (6) is equipped with camera lens (7), and the phase unit (6) connects setting industrial computer (8) by data line, described
Second straight-bar (4) is equipped with the second idler wheel (2) in one end corresponding with the first idler wheel (1), and the other end is corresponding with phase unit (6)
Setting flag point (12) at position, first straight-bar (3) connect with the central movable of the second straight-bar (4), to constitute scissors
Pitch structure.
2. a kind of thickness measurement system based on camera according to claim 1, which is characterized in that first straight-bar
(3) spring tensioning means (5) are equipped in the side close to the first idler wheel (1) on, described spring tensioning means (5) one end and first
Straight-bar (3) is connected, and the other end is connected with the second straight-bar (4).
3. a kind of thickness measurement system based on camera according to claim 2, which is characterized in that the spring straining
Device (5), including spring (9), the first connector (10) and the second connector (11), the both ends of the spring (9) are respectively with
A connection piece (10) and the second connector (11) are flexibly connected, and first connector (10) is fixed on the first straight-bar (3) installation
There is the side of the first idler wheel (1), the second connector (11) is fixed on the side that the first straight-bar (3) is equipped with the second idler wheel (2).
4. a kind of thickness measurement system based on camera according to claim 1, which is characterized in that the phase unit
(6) it sorts according to array.
5. a kind of measurement method of thickness measurement system based on camera according to claim 1 to 4, feature
It is, includes the following steps:
1): not placing measured object, two idler wheels is made to contact, acquire this using industrial computer (8) control phase unit (6)
When mark point (12) image, seek the mass center in mark point (12) region, as measurement origin O；
2): placing measured object, clamp measured object using idler wheel, control phase unit (6) using industrial computer 8 again and acquire every frame
Image seeks the mass center in mark point (12) region, the measurement coordinate (x as the i-th framei,yi)；
3): mark point (12) in the image acquired when not placing measured object according to the actual size of mark point (12) and step 1)
Size carries out conversion of the image coordinate system to world coordinate system, transformational relation are as follows:
Wherein, j, k are level, the length of vertical direction that camera acquires mark point (12) in image；M, N is mark point (12) water
Flat, vertical direction physical length, (Xi,Yi) it is under world coordinate system to measurement coordinate (x under image coordinate systemi,yi) transformation
Coordinate；
4): every frame image being handled, the displacement of mark point (12) in the picture is denoted as l, according to the transformational relation of step 3)
Obtaining this section of actual displacement isAccording to positional relationship it is found that the angle of two straight-bars at this time are as follows:
Wherein, lxFor phase unit (6) to the distance of two straight-bar tie points；A is phase unit (6) central region on the second straight-bar (4)
Projection to two straight-bar tie points distance；
A in above formula can be obtained according to actual displacement L and corresponding positional relationship:
Wherein, lbFor mark point (12) to the distance of two straight-bar tie points；
According to the angle α of two straight-barsiIt can obtain the thickness of measured object:
Wherein, lgFor idler wheel to the distance of two straight-bar tie points；R is the radius of two idler wheels；
5): when measurement dynamic thickness, using industrial computer (8) by thickness diThe Drawing of Curve changed over time comes out；It measures quiet
When state angle, to improve accuracy rate, using industrial computer (8) to the thickness d within the scope of certain timeiTake mean value as final
Thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810704076.0A CN109000569A (en) | 2018-06-30 | 2018-06-30 | A kind of thickness measurement system and its measurement method based on camera |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810704076.0A CN109000569A (en) | 2018-06-30 | 2018-06-30 | A kind of thickness measurement system and its measurement method based on camera |
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| CN109000569A true CN109000569A (en) | 2018-12-14 |
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| CN201810704076.0A Pending CN109000569A (en) | 2018-06-30 | 2018-06-30 | A kind of thickness measurement system and its measurement method based on camera |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109855585A (en) * | 2019-01-16 | 2019-06-07 | 昆明理工大学 | A kind of wire ga(u)ging equipment and its measurement method of cable product |
| CN114838690A (en) * | 2022-04-14 | 2022-08-02 | 新兴铸管股份有限公司 | Large-scale pipeline wall thickness measuring device and measuring method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0751824A (en) * | 1993-08-20 | 1995-02-28 | Nippon Steel Corp | Method and instrument for measuring thickness of cast slab |
| CN1357745A (en) * | 2000-12-08 | 2002-07-10 | 三星科英株式会社 | In-situ substrate thickness measuring system and method |
| CN101556142A (en) * | 2009-03-11 | 2009-10-14 | 湖南大学 | Visual detection method of ice coating thickness of overhead lines |
| CN104154870A (en) * | 2014-08-28 | 2014-11-19 | 青岛理工大学 | Method for measuring thickness of lubricating oil film in double-color-light interference mode |
| CN207515731U (en) * | 2017-11-24 | 2018-06-19 | 安徽理工大学 | A kind of measurer for thickness based on machine vision |
-
2018
- 2018-06-30 CN CN201810704076.0A patent/CN109000569A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0751824A (en) * | 1993-08-20 | 1995-02-28 | Nippon Steel Corp | Method and instrument for measuring thickness of cast slab |
| CN1357745A (en) * | 2000-12-08 | 2002-07-10 | 三星科英株式会社 | In-situ substrate thickness measuring system and method |
| CN101556142A (en) * | 2009-03-11 | 2009-10-14 | 湖南大学 | Visual detection method of ice coating thickness of overhead lines |
| CN104154870A (en) * | 2014-08-28 | 2014-11-19 | 青岛理工大学 | Method for measuring thickness of lubricating oil film in double-color-light interference mode |
| CN207515731U (en) * | 2017-11-24 | 2018-06-19 | 安徽理工大学 | A kind of measurer for thickness based on machine vision |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109855585A (en) * | 2019-01-16 | 2019-06-07 | 昆明理工大学 | A kind of wire ga(u)ging equipment and its measurement method of cable product |
| CN114838690A (en) * | 2022-04-14 | 2022-08-02 | 新兴铸管股份有限公司 | Large-scale pipeline wall thickness measuring device and measuring method thereof |
| CN114838690B (en) * | 2022-04-14 | 2023-05-19 | 新兴铸管股份有限公司 | Wall thickness measuring device and wall thickness measuring method for large-scale pipeline |
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Application publication date: 20181214 |