CN106595800A - Machine vision based material level meter - Google Patents
Machine vision based material level meter Download PDFInfo
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- CN106595800A CN106595800A CN201611228362.1A CN201611228362A CN106595800A CN 106595800 A CN106595800 A CN 106595800A CN 201611228362 A CN201611228362 A CN 201611228362A CN 106595800 A CN106595800 A CN 106595800A
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- 239000000463 material Substances 0.000 title claims abstract description 89
- 238000005259 measurement Methods 0.000 claims abstract description 32
- 238000012545 processing Methods 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 abstract description 7
- 239000003245 coal Substances 0.000 description 7
- 239000000945 filler Substances 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 230000008034 disappearance Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000012611 container material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 230000018109 developmental process Effects 0.000 description 1
- 239000012769 display material Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008450 motivation Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
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- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention relates to the field of material level measurement and discloses a machine vision based material level meter. A light emission part is used for projecting at least two light beams in any directions to the surface of a to-be-measured material; an image acquisition part is used for acquiring light spot images formed after the light beams are emitted to the surface of the to-be-measured material and sending the light spot images to an operation processing part; preset intervals of the light spot images when the to-be-measured material reaches a certain preset height are prestored in the operation processing part; after the image acquisition part sends the light spot images to an operation processor, the operation processor matches image intervals of the light spot images with the preset intervals to logically judge whether the to-be-measured material reaches the preset height or not. The machine vision based material level meter has advantages that interval characteristics of the light spot image are less prone to influences of material surfaces or measurement environments, and measured data are accurate; fixed-point monitoring of determined measurement targets can be realized.
Description
Technical field
The present invention relates to level gauging field, more particularly to a kind of machine vision level-sensing device.
Background technology
With the fast development of technology, level gauging is carried out with the idea for monitoring always with calculating by Machine Vision Recognition
Since it is wide concerned because Machine Vision Recognition not only can in real time show material（Object）Height or distance, while can
To show the image of measurement object to user, user can be monitored to monitoring environment with " seeing is believing ".
But, for many years machine vision level monitoring equipment, in actual production and life, is not really made in a large number
With the main cause with popularization, existing machine vision level monitoring apparatus and method for is also because, it is impossible to meet production scene
Real situation or measuring method cannot be realized really in actually measurement.
Existing machine vision material position identification equipment is broadly divided into the following two kinds with method：
1st, direct analysis judgement is carried out to measured material image, judges level of filler material.This kind of method directly gathers material and survey
Image in quantity space, is contrasted using the image prestored in real time imaging and measuring apparatus, judges that real time imaging is shown
Image meet that image in altimeter, make material position judgement.This kind of method, it is different that each is prerecorded and stored to needs
The material image of height, and be stored in equipment.The demarcation of height and image is carried out in advance.
Such as Chinese Patent Application No. 01107328.4, publication date 2002.11.6 discloses a kind of digital video frequency level indicator,
The digital video frequency level indicator is connected with each other by video input unit, image pick-up card, microprocessor and display screen and is formed.Using
Machine vision technique detects solid-material level, its detection material position step be material position image acquisition, Digital Image Processing and
Point
Analysis, storage show.Video input unit is directed at tested material, video input unit is connected to the video of image pick-up card
Input, microprocessor control image pick-up card gathers material position image by the sampling period of user's setting, and to the image
Enter
Row is processed, and compares and calculate material position actual value the material position coordinate figure for analyzing with the dial gauge of demarcation, while by material position
Figure
The variation tendency of picture, material position actual value and the value shows on a display screen.The Main Means of its measurement material position are to utilize
Material
The reading on dial gauge demarcated at the coordinate points of position is obtaining material position actual value.
2nd, material is irradiated using single point source, is judged by the characteristics of image to single hot spot, judge level of filler material.Should
The method of kind measures level of filler material indirectly by the characteristics of image of the single hot spot of measurement.
Such as：Chinese Patent Application No. 200710038493.8, publication date 2008.9.24 is disclosed one kind and is regarded based on machine
Feel
Material level measuring method and device, the device is made up of special point source, image acquisition machine, machine vision module etc..Adopt
Solid-material level is detected with machine vision technique, its detection material position step is：By special at the top of feed bin
Point
The light beam that light source is launched, is incident upon surface of material, is the taper of isosceles from from the vertical section of feed bin.Different high
The high-luminance light circular image of different-diameter is obtained on the level cross-sectionn of degree, checking type light is adopted by machine vision module
Circle
Detection algorithm is analyzed and processes, and calculates the diameter or size of light source and then obtains material position value.Meanwhile, truly
Display material position scene real scene image device.
China Patent No. 201010509916.1, a kind of contactless coal bin coal position photoelectric measurement method and device, there is provided
It is a kind of contactless, based on pixel count in image between laser facula imaging point and image center, obtain material in feed bin
The photoelectric measurement method and device of depth value, belongs to level gauging technical field.It is particularly well-suited to the depth survey of coal bin coal position.This
Invention device makes camera light path perpendicular to surface of material in tubular coal bunker spindle top stationary digital camera and generating laser,
Generating laser is arranged in into the position from the horizontal by θ angles, it is ensured that swash
The imaging region of light hot spot can be incident upon in the surface of material in the range of viewing field of camera.Camera is fixed using the segmentation of N shelves
Jiao, clearly image can be absorbed to meet at the different coal positions of coal bunker.Using DSP as processor cores, by calculating
Pixel count between laser facula imaging point and image center, the depth of the corresponding different pixels number average that inquiry is demarcated in advance
Table, completes depth detection.
Machine vision recognition method above, however algorithm is complicated；Otherwise feature is, by the seizure to single hot spot, to lead to
The analysis of light spot image is crossed, material position information is obtained.But, in actual measurement, single hot spot is very easy to such as circular image
The problems such as beam spot deformation, hot spot excalation etc. occur is affected by surface of material, environment, needs complicated algorithm to be judged
Or cannot accurately be judged.So as to cause error in judgement.
The content of the invention
Goal of the invention：For problems of the prior art, the present invention provides a kind of machine vision level-sensing device, evades
Prior art light spot shape disappearance, deformation etc. are difficult to catch, and are difficult the defect of computing, it is possible to achieve the pinpoint to measurement point
Monitoring；Algorithm is succinctly efficient.
Technical scheme：The invention provides a kind of machine vision level-sensing device, including light emitting members, Operation Processing Unit with
And at least one image acquisition component, the light emitting members and described image acquisition component are arranged at material to be measured and are located to survey
In quantity space, the Operation Processing Unit connects described image acquisition component；The light emitting members are used for the determinand
Material surface projects the light of at least two beam any directions；Described image acquisition component be used to gathering each light be irradiated to it is described
The light spot image formed after surface of material to be measured, and each light spot image is sent to into the Operation Processing Unit；The fortune
The determinand is prestored in calculation processing component to expect up to preset pitch during a certain preset height between each light spot image；
After each light spot image is sent to the arithmetic processor by described image acquisition component, the arithmetic processor is by right
Logical judgment goes out whether the material to be measured arrives after image pitch between each light spot image is matched with preset pitch
Up to preset height.
Preferably, the light is directional light；Now the Operation Processing Unit can also be by by each described parallel
The image pitch between actual pitch, each light spot image and each light spot image between light is gathered in described image
Image distance in part, calculation process obtains the material position information of the material to be measured.
Preferably, the spacing between the material to be measured and described image acquisition component is more than described image acquisition component
The twice of focal length.
Preferably, focal length of the described image acquisition component in measurement process is fixed.
Beneficial effect：It is very easy to be affected appearance by surface of material, environment with the image of single hot spot in prior art
The problems such as beam spot deformation, hot spot excalation leads to not accurately to measure material position information to be compared, and light emitting members are sent out in the present invention
Few two-beam line is incident upon, the image pitch feature that each light is irradiated between the light spot image that surface of material to be measured is produced is difficult to receive
Surface of material or measuring environment affect, and can accurately obtain light spot image information, even if image information has situations such as disappearance, deformation
Also measurement will not be excessively affected, measurement data is accurate；Without the need for substantial amounts of staking-out work in measurement, only becoming defocused just needs one
Fixed demarcation；The fixed point monitoring pair determine measurement target is capable of achieving, certainty of measurement is higher, and algorithm is succinct and efficient.
Description of the drawings
Fig. 1 is that the signal of machine vision level-sensing device in embodiment 1 flows to schematic diagram；
Fig. 2 is schematic diagram of the machine vision level-sensing device in measurement in embodiment 1；
Fig. 3 is schematic diagram of the machine vision level-sensing device in measurement in embodiment 2.
Specific embodiment
The present invention is described in detail below in conjunction with the accompanying drawings.
Embodiment 1：
Present embodiments provide for a kind of machine vision level-sensing device, as shown in figure 1, including light emitting members, image acquisition component
And Operation Processing Unit, light emitting members and image acquisition component are arranged in the measurement space of material place to be measured, at computing
Reason part connection image acquisition component；
Light emitting members are used to project the light of at least two beam any directions to surface of material to be measured；
Image acquisition component is used to gathering each light and is irradiated to the light spot image formed after surface of material to be measured, and by light spot image
It is sent to Operation Processing Unit；Herein focal length of the image acquisition component in measurement process is fixed, and is needed after zoom to measurement
Re-scaled, because zoom after image will change away from data, measurement after re-scaling is only accurately；To protect simultaneously
Demonstrate,prove twice of the spacing between material to be measured and image acquisition component more than the focal length of image acquisition component.
Prestore determinand in Operation Processing Unit to expect up between default between each light spot image during a certain preset height
Away from after each light spot image is sent to arithmetic processor by image acquisition component, arithmetic processor can be by each hot spot figure
Image pitch as between is matched with preset pitch, if image pitch is matched with a certain preset pitch, arithmetic processor
Just logical judgment can go out the material position of now material to be measured and reach the corresponding preset height of preset pitch afterwards.
Specifically, as illustrated in fig. 2, it is assumed that light emitting members launch the light S1 and S2, S1 and S2 of two beam any directions
It is at D, and known operations for the image pitch between A and B, A and B to be irradiated to the light spot image formed during surface of material to be measured
Determinand is prestored in reason part and expects that up to preset pitch during preset height h between A and B be D；Image acquisition component will be adopted
The light spot image A and B for collecting is sent to after Operation Processing Unit, and Operation Processing Unit will be matched D with D, if
The two can match or match after in error allowed band, then Operation Processing Unit just can logical judgment go out it is now to be measured
The material position of material is h.
Above-mentioned Operation Processing Unit not only can only connect an image acquisition component, can also connect many in a container
Multiple images acquisition component in individual image acquisition component, or even connection multiple containers, to obtain multiple positions in a container
Material position information in the material position information at place or multiple containers；Operation Processing Unit can be a single-chip microcomputer or multiple single-chip microcomputers
For the part of core, the part that one or more computer is core is may also be.
In the present embodiment, in order to prevent light emitting members and/or image acquisition component in the course of the work due to work
Make bad environments and shake, can be the two stable part of configuration damping, preferably use mechanical passive type or gyroscope master
The damping part of dynamic control formula；Further, since the environment residing for material to be measured is generally relatively more severe, dust is larger, in order to avoid
The larger directional light for hindering light emitting members to launch of dust and oblique light, and in order to avoid image acquisition component because dust is covered
Covering cannot gather image, and dust-proof ash disposal is additionally provided near image acquisition component and/or light emitting members in present embodiment
Part, using gas blowing mechanism or brusher motivation structure, the dust-proof ash disposal part can be by transporting for the dust-proof ash disposal part dextrorotation
Calculate processing component control and automatically turn on or close operation；Because image acquisition component has image real-time acquisition and supervisory function bit,
And material local environment light to be measured is typically more dim, image acquisition component is easily affected to collect clearly image, so
In the present embodiment can be installing illuminace component in the space of material place to be measured, it is possible to use visible illumination equipment or
Infrared ray non-visible light luminaire.
Preferably, in the present embodiment, temperature-measuring part can also be increased to machine vision level-sensing device, is preferably used infrared
Or laser temperature-measuring part, in the space of material place to be measured, for measuring the temperature information of surface of material；Temperature-measuring part energy
It is enough that the temperature information for measuring is sent to into Operation Processing Unit.
Preferably, in the present embodiment, if many beam light of light emitting members transmitting, image acquisition component just can
The light spot image comprising some light is collected, Operation Processing Unit is by using existing image processing techniquess means to these
Light spot image is carried out after calculation process, it becomes possible to obtain the three-dimensional image of material to be measured, more directly to believe material
Breath shows user.
Preferably, the image acquisition component in present embodiment can also gather flame or burning image, and by these figures
As being sent to Operation Processing Unit, Operation Processing Unit receives just can interpolate that after these images sky that material to be measured is located again
Interior material to be measured catches fire, it becomes possible to which real-time control alarm equipment alarm exports image to use by signal output component
Family, allows users to learn field conditions in time, takes measures in time；In addition, the image acquisition component in present embodiment is removed
Can collect outside the light spot image of light, additionally it is possible to material condition environment realistic picture to be measured in Real-time Collection measurement space
Picture, and these image transmittings are supplied into user more to Operation Processing Unit by the output of Operation Processing Unit Jing signal output component
The material situation being visually known in measurement space.
Embodiment 2：
Present embodiment is the further improvement of embodiment 1, and main improvement is：Machine vision material in embodiment 1
Position meter is merely able to realize that the one-point measurement to material to be measured is monitored, it is impossible to realize the continuous measurement to level of filler material, and in this reality
Applying the machine vision level-sensing device in mode can not only realize that the one-point measurement to material to be measured is monitored, moreover it is possible to realize to material material
The continuous measurement of position.
Specifically, in the present embodiment, each light that light emitting members are launched is a certain perpendicular to material to be measured
The directional light of cross section, by light emitting members launch two beam directional lights as a example by, as shown in Figure 3, it is known that two directional light S1 and S2 it
Between actual pitch be D, it is A and B to be irradiated to the light spot image that formed during surface of material to be measured, between two light spot image A and B
Image pitch is D, and image distances v of two the light spot image A and B in image acquisition component, can calculate the material of material to be measured
Position h=Dv/D.Thus, present embodiment just can be realized within the specific limits to the continuous measurement of level of filler material to be measured.
Additionally need it is emphasised that：Directional light truly is difficult real realization in reality, in present embodiment
Directional light also include in the range of measurement space Jie Jin the light of real directional light or in measurement range its diverging for
The light of the negligible close directional light of impact of this measuring method.
The respective embodiments described above technology design only to illustrate the invention and feature, its object is to allow and are familiar with technique
People will appreciate that present disclosure and implement according to this, can not be limited the scope of the invention with this.It is all according to this
Equivalent transformation or modification that bright spirit is done, all should be included within the scope of the present invention.
Claims (5)
1. a kind of machine vision level-sensing device, it is characterised in that including light emitting members, Operation Processing Unit and at least one figure
As acquisition component, the light emitting members and described image acquisition component are arranged in the measurement space of material place to be measured, institute
State Operation Processing Unit connection described image acquisition component；
The light emitting members are used to project the light of at least two beam any directions to the surface of material to be measured；Described image is adopted
Collection part is used to gathering each light and is irradiated to the light spot image formed after the surface of material to be measured, and by each hot spot
Image is sent to the Operation Processing Unit；Prestore the determinand in the Operation Processing Unit to expect up to a certain default height
Preset pitch when spending between each light spot image；
After each light spot image is sent to the arithmetic processor by described image acquisition component, the arithmetic processor leads to
Crossing logical judgment after matching with preset pitch to the image pitch between each light spot image and going out the material to be measured is
No arrival preset height.
2. machine vision level-sensing device according to claim 1, it is characterised in that the light is directional light.
3. machine vision level-sensing device according to claim 2, it is characterised in that the Operation Processing Unit is by each described
The image pitch between actual pitch, each light spot image and each light spot image between directional light is in described image
Image distance in acquisition component, calculation process obtains the material position information of the material to be measured.
4. the machine vision level-sensing device according to any one of claim 1 ~ 3, it is characterised in that the material to be measured and institute
State twice of the spacing between image acquisition component more than the focal length of described image acquisition component.
5. the machine vision level-sensing device according to any one of claim 1 ~ 3, it is characterised in that described image acquisition component
Focal length in measurement process is fixed.
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| CN201611228362.1A CN106595800A (en) | 2016-12-27 | 2016-12-27 | Machine vision based material level meter |
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| CN201611228362.1A CN106595800A (en) | 2016-12-27 | 2016-12-27 | Machine vision based material level meter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110726454A (en) * | 2019-11-20 | 2020-01-24 | 青岛澳科仪器有限责任公司 | Material level measuring method and system |
| CN112233178A (en) * | 2020-11-11 | 2021-01-15 | 广东拓斯达科技股份有限公司 | Dynamic material ranging method in complex environment based on machine vision |
| CN114460087A (en) * | 2021-12-22 | 2022-05-10 | 上海智能制造功能平台有限公司 | Welding spot defect detection system and method based on machine vision |
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Application publication date: 20170426 |