CN109489628A - A kind of hydrostatic level self-operated measuring unit and measurement method based on image recognition - Google Patents
A kind of hydrostatic level self-operated measuring unit and measurement method based on image recognition Download PDFInfo
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- CN109489628A CN109489628A CN201811399253.5A CN201811399253A CN109489628A CN 109489628 A CN109489628 A CN 109489628A CN 201811399253 A CN201811399253 A CN 201811399253A CN 109489628 A CN109489628 A CN 109489628A
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- level
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- floating ball
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
- G01C5/04—Hydrostatic levelling, i.e. by flexibly interconnected liquid containers at separated points
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Abstract
The invention discloses a kind of hydrostatic level self-operated measuring unit based on image recognition, including hydrostatic level, it is characterized by: hydrostatic level includes two level tanks being connected to by communicating pipe, each level tank is respectively arranged with connection liquid and floating ball, and floating ball is swum on connection liquid；It is provided with industrial camera above each level tank, is equipped with light source below each level tank；A kind of measurement method of hydrostatic level self-operated measuring unit invention additionally discloses use based on image recognition, including setting device, collection data, pretreatment image and calculating four steps of photographed image-related information.The present invention measures the acquisition of data using industrial camera, by the image for shooting hydrostatic level liquid level floating ball, and floating ball is obtained at a distance from camera lens by the size of floating ball in analysis image, realize the automatic measurement to hydrostatic level, investment that is practical and reducing human resources, improves the precision of measurement.
Description
Technical field
The invention mainly relates to measuring instrument fields, and in particular to a kind of hydrostatic level based on image recognition is surveyed automatically
Measure device and measurement method.
Background technique
Static liquid level is the precision instrument for measuring point-to-point transmission or the variation of multi-point relative elevation, is mainly used for large-scale storage
The vertical displacements such as tank, dam, nuclear power station, skyscraper, foundation pit, tunnel, bridge, subway and inclined monitoring, hydrostatic level
Have many advantages, such as that measurement accuracy height, stability are not influenced by low temperature by force, in measurement height difference, is surveyed by the variation of liquid level
Height difference is measured, traditional hydrostatic leveling uses artificial reading mode, and the error as caused by human factor will affect data
Accuracy, while can not also accomplish timely data acquisition.
With the development of the network information technology, has begun and data is acquired using integrated module automatic measurement unit,
It is connect by wired or wireless communication with computer, to realize automatic observation.Nowadays, it is realized with by information technology
The data acquisition function of automation has been greatly developed in hydrostatic leveling technology, occurs in the market a variety of quiet
Power level-and-rod equipment mostly uses greatly electronic sensor to carry out data acquisition and transmission, and cost is costly.And static(al) water
The design of quasi- instrument needs to reduce the investment of human resources as far as possible, improves the precision of measurement and realizes that the data of automation are adopted
Set analysis.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of hydrostatic levels based on image recognition to survey automatically
Measure device and measurement method.
In order to achieve the above object, the invention adopts the following technical scheme: a kind of hydrostatic level based on image recognition
Self-operated measuring unit, including hydrostatic level, it is characterised in that: the hydrostatic level includes two and is connected to by communicating pipe
Level tank is located at corresponding level tank the communicating pipe close to bottom position, and each level tank is respectively arranged with connection liquid and floats
Ball, the floating ball are swum on connection liquid；The level tank be enclosed construction, and thereon, lower end surface it is transparent；Each liquid
It is provided with industrial camera above the tank of position, the camera lens of the industrial camera faces the axial centre of level tank vertically downward；Each
Light source, level tank described in the source alignment are equipped with below the level tank.
Preferably, the industrial camera is fixed on above the level tank by fixing clamp, the lower end of the fixing clamp
Be fixed on the outer surface at the top of the level tank, be hollow structure inside the fixing clamp, at the top of the fixed peace of inner surface
Fill the industrial camera.
Preferably, the communicating pipe selects hose.
Preferably, the bottom of each level tank is equipped with circular hole, be installed in the circular hole communicating pipe.
Preferably, connecting an end interface of usb transmission line, the other end of the usb transmission line on the industrial camera
Interface connects computer.
The present invention also provides a kind of measurements of hydrostatic level self-operated measuring unit using above-mentioned based on image recognition
Method, comprising the following steps:
Step 1: setting device: after device is installed, being placed in measurement point；
Step 2: collecting data: opening the switch of light source, control industrial camera shooting floats on the image of the floating ball on connection liquid, will
Obtained image data is transferred on computer by wired or wireless mode；
Step 3: pretreatment image: being handled, obtained by carrying out binaryzation, filtering processing and dilation erosion to obtained image
Final target image；
Step 4: calculating photographed image-related information: being obtained in target image by the round least square method fitting screening of MATLAB
The size of floating ball, by pixel, by floating ball, shared size quantifies in the picture, according to floating ball in image
In shared pixel quantity obtain floating ball in image liquid level in hydrostatic level obtained with this to the distance of industrial camera lens
The scale value at place.
Preferably, connecting an end interface of usb transmission line, another termination on the industrial camera in the step 1
Mouth connection computer.
The utility model has the advantages that compared with prior art, the invention has the following advantages that the present invention is measured using industrial camera
The acquisition of data is obtained by shooting the image of hydrostatic level liquid level floating ball, and by the size of floating ball in analysis image
To floating ball at a distance from camera lens, the automatic measurement to hydrostatic level, throwing that is practical and reducing human resources are realized
Enter, improves the precision of measurement.
Detailed description of the invention
Fig. 1 is the sectional view of hydrostatic level；
Fig. 2 is the image sketch that industrial camera shoots floating ball；
Fig. 3 is the proportionate relationship figure of the pixel in a certain real area apart from upper imaging and industrial camera；
Wherein, 1, industrial camera, 2, hydrostatic level, 101, usb transmission line, 201, level tank, 202, communicating pipe, 203, floating
Ball, 204, fixing clamp, 3, light source.
Specific embodiment
In the following with reference to the drawings and specific embodiments, the present invention is furture elucidated, it should be understood that these embodiments are merely to illustrate
It the present invention rather than limits the scope of the invention, after the present invention has been read, those skilled in the art are to of the invention each
The modification of kind equivalent form falls within the application range as defined in the appended claims.
As shown in Figure 1, a kind of hydrostatic level self-operated measuring unit based on image recognition, including two hydrostatic levels
2, hydrostatic level 2 includes cylindrical level tank 201, communicating pipe 202, floating ball 203, fixing clamp 204 and is connected to liquid 205, liquid level
The inside of tank 201 is hollow structure and its upper and lower end face is transparent, and the lower end of fixing clamp 204 is fixed on the outer of 201 top of level tank
On surface, inside fixing clamp 204 be hollow structure, at the top of inner surface be fixedly mounted industrial camera 1；On industrial camera 1
An end interface of usb transmission line 101 is connected, another end interface of usb transmission line 101 connects computer.Connection liquid 205 is located at liquid level
The inside of tank 201, floating ball 203 select ball shape structure, swim on the liquid level of connection liquid 205；The bottom of level tank 201 is equipped with circle
The communicating pipe 202 of hose construction is installed in hole in the circular hole；The communicating pipe 202 of two hydrostatic levels 2 is interconnected；Quiet
The lower section of power level 2 is equipped with light source 3, and light source 3 is directed at the lower end surface of level tank 201.
The present invention also provides a kind of measurements of hydrostatic level self-operated measuring unit using above-mentioned based on image recognition
Method, comprising the following steps:
Step 1: setting device: hydrostatic level is placed in measurement point, and a termination of usb transmission line is connected on industrial camera
Mouthful, another end interface connects computer；
Step 2: collecting data: opening the switch of light source, control industrial camera shooting floats on the image of the floating ball on connection liquid, will
Obtained image data is transferred on computer by wired or wireless mode；
Step 3: pretreatment image: being handled, obtained by carrying out binaryzation, filtering processing and dilation erosion to obtained image
Final target image；
Step 4: calculating photographed image-related information: being obtained in target image by the round least square method fitting screening of MATLAB
The size of floating ball, by pixel, by floating ball, shared size quantifies in the picture, according to floating ball in image
In shared pixel quantity obtain floating ball in image liquid level in hydrostatic level obtained with this to the distance of industrial camera lens
The scale value at place.
The present invention includes that data acquisition and software analyze two systems, and wherein data collection system is to fix industrial camera
Lamp source is installed above hydrostatic level, and in level pipeline, the figure of natant floating ball is shot by industrial camera
Picture, and image data is transmitted out by wired or wireless mode；Image can pass through software analysis system after obtaining
It is handled, this process mainly passes through MATLAB and handles figure, is broadly divided into the pretreatment stage and figure of image
As calculating two parts of relevant information；The pretreatment of image includes the binaryzation of image, the filtering processing of image and image
Dilation erosion processing, into excessively a series of pretreatment, available required target image；Target image is obtained to need later
Obtain the relevant information of floating ball, it is therefore desirable to screen to target information in image；Floating ball uses spherical designs, and shooting is obtained
The image obtained is a circle, obtains the relevant information of target floating ball by the round least square method fitting screening of MATLAB,
Obtain the size of floating ball in image；Floating ball shared size in the picture, can be quantified by pixel, be floated
Ball in the picture shared pixel how much at a distance from floating ball to industrial camera at certain corresponding relationship；By obtaining image
In floating ball shared by pixel quantity, floating ball can obtain static(al) at a distance from camera lens with this in available image
Scale value in level where liquid level, and then can be with measurement result.
As Figure 2-3, wherein OO1Distance be L, indicate floating ball center to camera lens distance；O3O4What is indicated is into
The plane of picture；O1O2Distance be L ', indicate camera lens to actual imaging plane distance；OO2Distance be d, indicate floating ball center
To the distance of actual imaging plane；OO3Distance be R, indicate the real radius of floating ball, be known quantity；O2O3Distance be r, table
Show the radius of actual imaging plane；F indicates camera lens to the distance of industrial camera imaging plane.
In use, connecting hydrostatic level according to shown in Fig. 1, by floating ball as on liquid level, finally industrial camera is consolidated
It is scheduled on above the tube wall of hydrostatic level, obtains apparatus structure as shown in Figure 1.Passed through by the image that industrial camera takes
It is wired or wirelessly connection be transferred on computer, MATLAB can be passed through on computers and carry out image procossing and acquisition
The relative dimensions information of floating ball obtains pixel quantity shared by floating ball in image, passes through the pixel quantity and mirror with calibration
The relationship of distance at head to floating ball center is compared, and is obtained real lens to the distance of floating ball, is obtained liquid level scale with this
Variation, obtains actual measurement result.
As Fig. 2 can shift onto out floating ball center to distance of camera lens L and the object distance L ' of actual imaging relationship:
Meanwhile the relationship of available actual imaging area S and actual imaging image distance L:
The shared pixel quantity of floating ball in image can be obtained by relevant ratiometric conversion according to Fig. 3, it is known that in image
The imaging h ardware area of industrial camera is S ', and the resolution ratio of imaging is K, pixel quantity shared by floating ball in available image
K ' expression formula are as follows:
After obtained K ', the related table of pixel quantity shared by comparison image-forming range and the imaging of image upper floating ball
Floating ball center is made to the distance L of camera lens, the Measurement scales value of hydrostatic level is determined with this.
The present invention is based on industrial cameras to design a kind of static level automatic measurement mechanism, for realizing the height difference of automation
Measurement can replace artificial progress vertical survey, compensate for the poor reliability in traditional artificial reading mode, can not continuously supervise automatically
The defects of survey.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (7)
1. a kind of hydrostatic level self-operated measuring unit based on image recognition, including hydrostatic level (2), it is characterised in that:
The hydrostatic level (2) includes two level tanks (201) being connected to by communicating pipe (202), the communicating pipe (202)
Positioned at corresponding level tank (201) close to bottom position, each level tank (201) is respectively arranged with connection liquid (205) and floating ball
(203), the floating ball (203) swims in connection liquid (205)；
The level tank (201) be enclosed construction, and thereon, lower end surface it is transparent；
It is provided with industrial camera (1) above each level tank (201), the camera lens of the industrial camera (1) is vertically downward just
Against the axial centre of level tank (201)；
It is equipped with light source (3) below each level tank (201), the light source (3) is directed at the level tank (201).
2. the hydrostatic level self-operated measuring unit according to claim 1 based on image recognition, it is characterised in that: described
Industrial camera (1) is fixed on above the level tank (201) by fixing clamp (204), and the lower end of the fixing clamp (204) is fixed
Be hollow structure inside the fixing clamp (204) on the outer surface at the top of the level tank (201), at the top of inner surface
The industrial camera (1) is fixedly mounted.
3. the hydrostatic level self-operated measuring unit according to claim 1 based on image recognition, it is characterised in that: described
Communicating pipe (202) selects hose.
4. the hydrostatic level self-operated measuring unit according to claim 1 based on image recognition, it is characterised in that: each
The bottom of the level tank (201) is equipped with circular hole, and the communicating pipe (202) are installed in the circular hole.
5. the hydrostatic level self-operated measuring unit according to claim 1 based on image recognition, it is characterised in that: described
An end interface of usb transmission line (101), another end interface connection of the usb transmission line (101) are connected on industrial camera (1)
Computer.
6. a kind of survey of the hydrostatic level self-operated measuring unit using a method as claimed in any one of claims 1 to 5 based on image recognition
Amount method, it is characterised in that: the following steps are included:
Step 1: setting device: after device is installed, being placed in measurement point；
Step 2: collecting data: opening the switch of light source (3), control industrial camera (1) shooting floats on floating in connection liquid (205)
Obtained image data is transferred on computer by the image of ball (203) by wired or wireless mode；
Step 3: pretreatment image: being handled, obtained by carrying out binaryzation, filtering processing and dilation erosion to obtained image
Final target image；
Step 4: calculating photographed image-related information: being obtained in target image by the round least square method fitting screening of MATLAB
The size of floating ball (203), by pixel, by floating ball (203), shared size quantifies in the picture, according to
Shared pixel quantity obtains the distance that floating ball in image (203) arrive industrial camera (1) camera lens to floating ball (203) in the picture,
The scale value in hydrostatic level where liquid level is obtained with this.
7. measurement method according to claim 6, it is characterised in that: in the step 1, connected on the industrial camera (1)
One end interface of usb transmission line (101), another end interface connect computer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811399253.5A CN109489628A (en) | 2018-11-22 | 2018-11-22 | A kind of hydrostatic level self-operated measuring unit and measurement method based on image recognition |
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| CN201811399253.5A CN109489628A (en) | 2018-11-22 | 2018-11-22 | A kind of hydrostatic level self-operated measuring unit and measurement method based on image recognition |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112781549A (en) * | 2021-02-22 | 2021-05-11 | 河海大学 | Static force level gauge based on machine vision and having inclination measuring function and measuring method thereof |
| CN112862820A (en) * | 2021-03-17 | 2021-05-28 | 水利部交通运输部国家能源局南京水利科学研究院 | Intelligent acquisition device for water depth of piezometer tube group based on image recognition technology and water depth acquisition method thereof |
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| CN108731638A (en) * | 2018-03-30 | 2018-11-02 | 南京理工大学 | The screw type hydrostatic level of liquid level is measured using image analysis technology |
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| CN202285422U (en) * | 2011-10-21 | 2012-06-27 | 常州工学院 | Water level measurement device based on floater imaging |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112781549A (en) * | 2021-02-22 | 2021-05-11 | 河海大学 | Static force level gauge based on machine vision and having inclination measuring function and measuring method thereof |
| CN112862820A (en) * | 2021-03-17 | 2021-05-28 | 水利部交通运输部国家能源局南京水利科学研究院 | Intelligent acquisition device for water depth of piezometer tube group based on image recognition technology and water depth acquisition method thereof |
| CN112862820B (en) * | 2021-03-17 | 2023-12-29 | 水利部交通运输部国家能源局南京水利科学研究院 | Image recognition technology-based intelligent acquisition device and method for water depth of manometric tube group |
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Application publication date: 20190319 |