CN206311165U - Machine vision level-sensing device - Google Patents
Machine vision level-sensing device Download PDFInfo
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- CN206311165U CN206311165U CN201621446456.1U CN201621446456U CN206311165U CN 206311165 U CN206311165 U CN 206311165U CN 201621446456 U CN201621446456 U CN 201621446456U CN 206311165 U CN206311165 U CN 206311165U
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Abstract
The utility model is related to level gauging field, discloses a kind of machine vision level-sensing device, and light emitting members are used to be projected to surface of material to be measured the light of at least two beam any directions；Image acquisition component is irradiated to the light spot image formed after surface of material to be measured for gathering each light, and each light spot image is sent into APU；Determinand is prestored in APU and expects default spacing during up to a certain preset height between each light spot image；After each light spot image is sent to arithmetic processor by image acquisition component, arithmetic processor by being matched with default spacing to the image spacing between each light spot image after logic judgment go out whether material to be measured reaches preset height.Light spot image pitch characteristics are difficult to be influenceed by surface of material or measuring environment in the utility model, and measurement data is accurate；It is capable of achieving the fixed point monitoring pair determine measurement target.
Description
Technical field
The utility model is related 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 by Machine Vision Recognition and calculating
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, machine vision level monitoring equipment, in actual production and life, is not made largely really for many years
With the main cause with popularization, also because existing machine vision level monitoring apparatus and method for, 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
With the image in measurement space, contrasted using the image prestored in realtime graphic and measuring apparatus, judged realtime graphic institute
The image of displaying meets that image in altimeter, makes material position judgement.This kind of method is, it is necessary to prerecord and store each
The material image of different 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 formed.
Using
Machine vision technique detects solid-material level, and its detection material position step is material position IMAQ, at digital picture
Manage and divide
Analysis, storage display.Video input unit is directed at tested material, video input unit is connected to regarding for image pick-up card
Frequently
Input, microprocessor control image pick-up card gathers material position image by the sampling period of user's setting, and to this
Image enters
Row treatment, the material position coordinate value that will be analyzed compares and calculates material position actual value with the calibration gauge demarcated, while general
Material position figure
The variation tendency of picture, material position actual value and the value shows on a display screen.Its measurement material position Main Means be
Using material
The reading on calibration gauge demarcated at the coordinate points of position obtains material position actual value.
2nd, material is irradiated using single spot light, is judged by the characteristics of image to single hot spot, judge level of filler material.Should
Kind of method measures level of filler material indirectly by measuring the characteristics of image of single hot spot.
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 by groups such as special spot light, IMAQ machine, machine vision modules
Into.Adopt
Solid-material level is detected with machine vision technique, its detection material position step is：By the spy at the top of feed bin
Different point
The light beam that light source is launched, is incident upon surface of material, is the taper of isosceles from the vertical section of feed bin.Not
With high
The high-luminance light circular image of different-diameter is obtained on the level cross-sectionn of degree, by machine vision module using checking
Type light is justified
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, belong to level gauging technical field.It is particularly well-suited to the depth survey of coal bin coal position.This
Utility model device makes camera light path perpendicular to material table in tubular coal bunker spindle top stationary digital camera and generating laser
Face, the position from the horizontal by θ angles is arranged in by generating laser, it is ensured that swashed
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 using N grades of segmentation
Focus, clearly image can be absorbed at the different coal positions of coal bunker to meet.Using DSP as processor cores, by meter
Calculate the 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 influenceed, it is necessary to the algorithm of complexity is judged by surface of material, environment
Or cannot accurately be judged.So as to cause error in judgement.
Utility model content
Utility model purpose：For problems of the prior art, the utility model provides a kind of machine vision material position
Meter, has evaded prior art light spot shape missing, deformation etc. and has been difficult to catch, and is difficult the defect of computing, it is possible to achieve to measurement point
Pinpoint monitoring；Algorithm is succinctly efficient.
Technical scheme：The utility model provides a kind of machine vision level-sensing device, including light emitting members, arithmetic processing section
Part and at least one image acquisition component, the light emitting members and described image acquisition component are arranged at material institute to be measured
In measurement space, the APU connects described image acquisition component；The light emitting members are used to be treated to described
Survey the light that surface of material projects at least two beam any directions；Described image acquisition component is irradiated to for gathering each light
The light spot image formed after the surface of material to be measured, and each light spot image is sent to the APU；Institute
State and the determinand is prestored in APU expect default between each light spot image during up to a certain preset height
Spacing；After each light spot image is sent to the arithmetic processor by described image acquisition component, the arithmetic processor
Logic judgment goes out the material to be measured after by being matched with default spacing to the image spacing between each light spot image
Whether preset height is reached.
Preferably, the light is directional light；Now the APU can also be by by each described parallel
Image spacing between actual spacing, each light spot image and each light spot image between light are 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 influenceed appearance by surface of material, environment with the image of single hot spot in the prior art
The problems such as beam spot deformation, hot spot excalation leads to not accurately to measure material position information to be compared, light emission part in the utility model
Part transmitting at least two-beam line, each light is irradiated to image pitch characteristics between the light spot image that surface of material to be measured is produced not
Easily influenceed by surface of material or measuring environment, can accurately be obtained light spot image information, even if image information has missing, deformation etc.
Situation also will not excessively influence measurement, and measurement data is accurate；Without substantial amounts of staking-out work in measurement, only becoming defocused just need
Want certain demarcation；The fixed point monitoring pair determine measurement target is capable of achieving, certainty of measurement is higher, and algorithm is succinct and efficient.
Brief description of the drawings
Fig. 1 is that the signal of machine vision level-sensing device in implementation method 1 flows to schematic diagram；
Fig. 2 is schematic diagram of the machine vision level-sensing device in measurement in implementation method 1；
Fig. 3 is schematic diagram of the machine vision level-sensing device in measurement in implementation method 2.
Specific embodiment
The utility model is described in detail below in conjunction with the accompanying drawings.
Implementation method 1：
Present embodiments provide for a kind of machine vision level-sensing device, as shown in figure 1, including light emitting members, IMAQ
Part and APU, light emitting members and image acquisition component are arranged in measurement space where material to be measured, fortune
Calculate processing component connection image acquisition component；
Light emitting members are used to be projected to surface of material to be measured the light of at least two beam any directions；
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 hot spot
Image is sent to APU；Focal length of the image acquisition component in measurement process is fixed herein, and it is right to be needed after varifocal
Measurement is re-scaled, because zoom after image will change away from data, measurement is only accurately after re-scaling；Simultaneously
Ensure twice of the spacing more than the focal length of image acquisition component between material to be measured and image acquisition component.
Prestore that determinand expects during up to a certain preset height between each light spot image in APU it is default between
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 spacing as between is matched with default spacing, if image spacing and a certain default pitch match, arithmetic processor
Just logic judgment can go out the material position of now material to be measured and reach the default corresponding preset height of spacing 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
The light spot image formed during surface of material to be measured is irradiated to for the image spacing between A and B, A and B is at D ', and known operations
Determinand is prestored in reason part and expects that up to default spacing 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 are sent to after APU, and APU will be matched D ' with D ' ', if
The two can match or match after in error allowed band, then APU just can logic judgment go out it is now to be measured
The material position of material is h.
Above-mentioned APU 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 or multiple containers at place；APU is that can be a single-chip microcomputer or multiple single-chip microcomputers
It is the part of core, may also be the part that one or more computer is core.
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 configuration damping stabilization part, 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, be additionally provided with dust-proof ash disposal in present embodiment near image acquisition component and/or light emitting members
Part, the dust-proof ash disposal part dextrorotation uses gas blowing mechanism or brusher motivation structure, and the dust-proof ash disposal part can be by transporting
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, easily influence image acquisition component collects clearly image, so
Illuminace component can also be installed in space where material to be measured in the present embodiment, it is possible to use visible illumination equipment or
Infrared ray non-visible light lighting apparatus.
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 space where material to be measured, the temperature information for measuring surface of material；Temperature-measuring part energy
Enough temperature informations that will be measured are sent to APU.
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, APU is by using existing image processing techniques means to these
After light spot image carries out calculation process, it becomes possible to obtain the three-dimensional image of material to be measured, so that more directly material to be believed
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 APU, APU just can interpolate that sky where material to be measured after receiving these images 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 by APU to APU through signal output component output
It is visually known the material situation in measurement space.
Implementation method 2：
Present embodiment is the further improvement of implementation method 1, and main improvement is：Machine in implementation method 1 is regarded
Feel that level-sensing device is merely able to realize the one-point measurement monitoring to material to be measured, it is impossible to continuous measurement of the realization to level of filler material, and
Machine vision level-sensing device in present embodiment can not only realize the one-point measurement monitoring to material to be measured, moreover it is possible to realize to thing
Expect the continuous measurement of material 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 spacing be D, the light spot image that is formed during surface of material to be measured is irradiated to for A and B, between two light spot image A and B
Image spacing is D ', and image distance vs 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 '.In this way, present embodiment just can realize continuous measurement within the specific limits to 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 close to the light of real directional light or in measurement range its diverging for
The negligible light close to directional light of influence of this measuring method.
The respective embodiments described above only to illustrate technology design of the present utility model and feature, this are familiar with its object is to allow
The people of technology will appreciate that content of the present utility model and implements according to this, can not limit protection model of the present utility model with this
Enclose.All equivalent transformations done according to the utility model Spirit Essence or modification, should all cover in protection model of the present utility model
Within enclosing.
Claims (5)
1. a kind of machine vision level-sensing device, it is characterised in that including light emitting members, APU and at least one figure
As acquisition component, the light emitting members and described image acquisition component are arranged in measurement space where material to be measured, institute
State APU connection described image acquisition component；
The light emitting members are used to be projected to the surface of material to be measured the light of at least two beam any directions；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 APU；The determinand is prestored in the APU to expect up to a certain default height
Default spacing 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 logic judgment after being matched with default spacing to the image spacing 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 APU is by each described
Image spacing between actual spacing, 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 more than the focal length of described image acquisition component between 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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| Application Number | Priority Date | Filing Date | Title |
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| CN201621446456.1U CN206311165U (en) | 2016-12-27 | 2016-12-27 | Machine vision level-sensing device |
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| CN201621446456.1U CN206311165U (en) | 2016-12-27 | 2016-12-27 | Machine vision level-sensing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106595800A (en) * | 2016-12-27 | 2017-04-26 | 上海云鱼智能科技有限公司 | Machine vision based material level meter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106595800A (en) * | 2016-12-27 | 2017-04-26 | 上海云鱼智能科技有限公司 | Machine vision based material level meter |
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