CN105293002B - The belt longitudinal tear detection method of view-based access control model - Google Patents
The belt longitudinal tear detection method of view-based access control model Download PDFInfo
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- CN105293002B CN105293002B CN201510708601.2A CN201510708601A CN105293002B CN 105293002 B CN105293002 B CN 105293002B CN 201510708601 A CN201510708601 A CN 201510708601A CN 105293002 B CN105293002 B CN 105293002B
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- 238000001514 detection method Methods 0.000 title claims abstract description 19
- 238000003384 imaging method Methods 0.000 claims abstract description 9
- 230000003287 optical effect Effects 0.000 claims abstract description 4
- 230000001186 cumulative effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 10
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000005299 abrasion Methods 0.000 abstract 1
- 238000005259 measurement Methods 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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Abstract
The invention discloses a kind of belt longitudinal tear detection method of view-based access control model, imaging system is installed below belt, imaging system optical axis is perpendicular to belt non-bearing face, absorb clear strap surface image, axial approximate consistent N bar line segments of selected directions and belt in the picture, discontinuity point is detected in every line segment neighborhood, when threshold value of the discontinuous points more than setting, judges that longitudinal tear occurs for belt.This method measurement accuracy is high, and sensitivity is high, and equipment is simple, cost is low, and easy to install and maintenance, non-contact detection, detection device is not exposed to abrasion.
Description
Technical field
The present invention relates to a kind of ribbon conveyer belt longitudinal tear detection method, more particularly to a kind of view-based access control model is non-
Contact belt longitudinal tear detection method.
Background technology
In coal production, ribbon conveyer is one of topmost means of transport, and ribbon conveyer is in conveying coal mistake
Belt longitudinal tear accident happens occasionally in journey, if it find that not in time, whole piece belt tearing can be caused to damage, cause huge
Economic loss.The method of detection belt longitudinal tear has at present：Impulse detection method (impulsive force is propagated in detection belt medium), support
Roller exception stress detection (unusual condition of analysis carrying roller stress), supercritical ultrasonics technology (ultrasonic propagation in detection belt medium), pressure
Quick electric-resistivity method (material leakage situation below detection belt), embedding inlay technique (embedded conductive rubber, optical fiber etc. in belt) etc., in addition
The also image detection based on line laser, above-mentioned detection method or has certain defect in principle, or needs belt to tear
Split it is longer can just detect, or cost is higher, or mounting assembly it is many, install complicated, or later maintenance is cumbersome etc..
Need a kind of belt longitudinal tear inspection for solving or at least improving one or more problems intrinsic in the prior art
Survey method.
The content of the invention
Therefore it is an object of the invention to provide a kind of belt longitudinal tear detection method of view-based access control model, this method is used
Non-contact detection, detects sensitive height, and cost is low, and apparatus assembly is few, easy to install with safeguarding.
According to a kind of embodiment form there is provided a kind of belt longitudinal tear detection method of view-based access control model, the present invention is provided
Technical scheme it is as follows：Imaging system is installed below belt, imaging system optical axis is perpendicular to belt non-bearing face, and intake is clear
Strap surface image K, handles image, comprises the following steps：
A. N bars consistent line segment approximate with belt axial direction is defined, the line segment is defined as belonging to the element in S=K × M,
Wherein M=[90 ° of-φ, 90 ° of+φ] × L, the direction and length L, φ for defining line segment are the angle value of setting；
B. to any bar line segment u therein, orthogonal to that all tangent sections, tangent section parameter e, l are calculatedextDescription,
E is that consecutive tangent is intersegmental away from lextFor half length of tangent section, line segment u divides equally tangent section；
C. for line segment u each tangent section, sampled with spacing r, calculate the shade of gray of each sample point
Value, retains shade of gray value and is more than given threshold glSampled point；The shade of gray value of the cumulative point remained, retains cumulative
Value is more than given threshold ghPoint, wherein, gl, ghIt is given parameter, | gh| ＞ | gl|；
D. it is l with lengthselLine element to accumulated value in line segment u all tangent sections be more than ghPoint open fortune as morphology
Calculate；
E. calculate accumulated value and be more than ghPoints P；
F. the distance calculated apart from line segment u is less than σ points K, whenDuring more than η, judge that belt is torn, otherwise, take
Another line segment in N bar line segments, repeat step B；Wherein, σ and η is given parameter.
Brief description of the drawings
By following explanation, accompanying drawing embodiment becomes apparent, and it is only preferred with least one being described in conjunction with the accompanying
But the way of example of non-limiting example is provided.
Fig. 1 is the line segment schematic diagram of the inventive method.
Fig. 2 is the tangent section schematic diagram of the inventive method.
Fig. 3 is the Cleaning Principle schematic diagram of the inventive method.
Embodiment
Imaging device is installed below belt, imaging device optical axis absorbs clear belt figure perpendicular to the non-loading surface of belt
Picture, image size is 640 (width) × 480 (height) pixels, picture traverse direction correspondence belt width direction, short transverse pair
Answer belt axial direction.In image coordinate system, set S=K × M of one description image middle conductor of definition, wherein K=[0,
Xmmax] × [0, Xnmax], XmmaxFor picture traverse direction maximum pixel coordinate, XnmaxFor picture altitude direction maximum pixel coordinate；
M=[90 ° of-φ, 90 ° of+φ] × L, defines direction and the length of line segment, and its length L is defined as belt and occurs minimum detectable
Jian's shadow length during longitudinal tear length on image, φ is the angle value of setting, and value is to make line segment direction approximately and belt
Axial direction is consistent；Line segment u ∈ S, u=(c in definition set1(u), c2(u), θ (u), L), wherein c1(u), c2(u) respectively
Be line segment u central points in picture traverse direction and short transverse coordinate, θ (u) is the direction of line segment, as shown in Figure 1.Define cutting
Line segment u tangent section, tangent section parameter e, r, lextDescription, e is that consecutive tangent is intersegmental away between points of the r for sampling tangent section
Away from lextFor half length of tangent section, as shown in Figure 2.Cleaning Principle is as shown in figure 3, show that imaging during belt tearing is shown in figure
The cutting line segment of intention and given line segment He the line segment and the discontinuity point detected.Specific process step is as follows：
A. the line segment that N bars belong to set S is defined；
B. to any bar line segment u therein, orthogonal to that all tangent sections are calculated；
C. for line segment u each tangent section, sampled with spacing r, calculate the shade of gray of each sample point
Value, retains shade of gray value and is more than given threshold glSampled point；The shade of gray value of the cumulative point remained, retains cumulative
Value is more than given threshold ghPoint, wherein, gl, ghIt is given parameter, | gh| ＞ | gl|；
D. it is l with lengthselLine element to accumulated value in line segment u all tangent sections be more than ghPoint open fortune as morphology
Calculate；
E. calculate accumulated value and be more than ghPoints P；
F. the distance calculated apart from line segment u is less than σ points K, whenDuring more than η, judge that belt is torn, otherwise, take
Another line segment in N bar line segments, repeat step B；Wherein, σ and η is given parameter.
Claims (1)
1. a kind of belt longitudinal tear detection method of view-based access control model, installs imaging system, imaging system optical axis below belt
Perpendicular to belt non-bearing face, clear strap surface image is absorbed, image is handled, it is characterised in that comprise the following steps：
A. N bars consistent line segment approximate with belt axial direction is defined, the line segment is defined as belonging to the element in S=K × M, wherein K
=[0, Xmmax] × [0, Xnmax], XmmaxFor picture traverse direction maximum pixel coordinate, XnmaxFor picture altitude direction maximum pixel
Coordinate；M=[90 ° of-φ, 90 ° of+φ] × L, the direction and length L, φ for defining line segment are the angle value of setting；
B. to any bar line segment u therein, orthogonal to that all tangent sections, tangent section parameter e, l are calculatedextDescribe, e is
Consecutive tangent is intersegmental away from lextFor half length of tangent section, line segment u divides equally tangent section；
C. for line segment u each tangent section, sampled with spacing r, calculate the shade of gray value of each sample point, protected
Shade of gray value is stayed to be more than given threshold glSampled point；The shade of gray value of the cumulative point remained, retains accumulated value big
In given threshold ghPoint, wherein, gl, ghIt is given parameter, | gh| ＞ | gl|；
D. it is l with lengthselLine element to accumulated value in line segment u all tangent sections be more than ghPoint make morphology opening operation；
E. calculate accumulated value and be more than ghPoints p；
F. the distance calculated apart from line segment u is less than σ points q, whenDuring more than η, judge that belt is torn, otherwise, take N bars
Another line segment in line segment, repeat step B；Wherein, σ and η is given parameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510708601.2A CN105293002B (en) | 2015-10-28 | 2015-10-28 | The belt longitudinal tear detection method of view-based access control model |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510708601.2A CN105293002B (en) | 2015-10-28 | 2015-10-28 | The belt longitudinal tear detection method of view-based access control model |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105293002A CN105293002A (en) | 2016-02-03 |
| CN105293002B true CN105293002B (en) | 2017-07-25 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3792459A (en) * | 1972-03-20 | 1974-02-12 | F Snyder | Conveyor belt rip detector |
| CN100594375C (en) * | 2008-02-18 | 2010-03-17 | 马洪君 | Method for detecting transveyer adhesive tape laceration |
| CN103017672A (en) * | 2012-12-06 | 2013-04-03 | 中铁大桥局集团武汉桥梁科学研究院有限公司 | Non-contact nondestructive testing method for bridge structure |
| CN103292714B (en) * | 2013-06-05 | 2016-01-27 | 中国矿业大学(北京) | Based on the belt conveyor coal piling state testing method of image technique |
| CN104828517B (en) * | 2015-05-05 | 2017-03-29 | 中国矿业大学(北京) | The belt deviation detection method of view-based access control model |
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Granted publication date: 20170725 Termination date: 20191028 |