NL2031937B1 - Method and device for automatically identifying water level - Google Patents

Method and device for automatically identifying water level Download PDF

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Publication number
NL2031937B1
NL2031937B1 NL2031937A NL2031937A NL2031937B1 NL 2031937 B1 NL2031937 B1 NL 2031937B1 NL 2031937 A NL2031937 A NL 2031937A NL 2031937 A NL2031937 A NL 2031937A NL 2031937 B1 NL2031937 B1 NL 2031937B1
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Netherlands
Prior art keywords
water level
staff gauge
band
area
shaped areas
Prior art date
Application number
NL2031937A
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Dutch (nl)
Inventor
Ren Qiang
Wang Feng
Chen Xiaohui
Pan Fan
Xia Ping
Huang Qiang
Lei Bangjun
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Univ China Three Gorges Ctgu
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Priority to NL2031937A priority Critical patent/NL2031937B1/en
Application granted granted Critical
Publication of NL2031937B1 publication Critical patent/NL2031937B1/en

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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
    • G01F23/04—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 by dip members, e.g. dip-sticks
    • 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
    • G01F23/22—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 by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—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 by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/284—Electromagnetic waves
    • G01F23/292—Light, e.g. infrared or ultraviolet
    • G01F23/2921—Light, e.g. infrared or ultraviolet for discrete levels
    • 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
    • G01F23/80—Arrangements for signal processing
    • G01F23/802—Particular electronic circuits for digital processing equipment
    • G01F23/804—Particular electronic circuits for digital processing equipment containing circuits handling parameters other than liquid level
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00—Keeping dry foundation sites or other areas in the ground

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

Provided are a method and device for automatically identifying a water level. The method includes: extracting a staff gauge area from a staff gauge image to be identified, and dividing the staff gauge area into a plurality of band-shaped areas of a staff gauge head and a plurality of band-shaped areas of a staff gauge measurement part in the staff gauge area; acquiring a staff gauge number corresponding to the vectors and a staff gauge zero-point elevation corresponding to the staff gauge number; and acquiring a last boundary of all the band-shaped areas of the staff gauge measurement part, acquiring an intersection point of the last boundary as well as the water surface and a water level reading of the intersection point, and adding the water level reading and the staff gauge zero-point elevation to acquire a water level identification result. The present disclosure enables automatic identification of the water level.

Description

METHOD AND DEVICE FOR AUTOMATICALLY IDENTIFYING WATER
LEVEL
TECHNICAL FIELD
[DI] The present disclosure belongs to the technical field of water level monitoring, and in particular to a method and device for automatically identifying a water level.
BACKGROUND ART
[02] A water level staff gauge, being widely applied in projects such as soft soil foundation treatment, ports and piers, is used for observing changes in underground water level and ocean tide water level.
[03] Manual observation and reading of a staff gauge is an important means of acquiring a water level by the navigation channel personnel. Under digital navigation channel conditions, an automatic water level collection mode by an automatic gauging station has gradually replaced a manual observation and reading mode, and the automatic gauging station adopts a bubble type water level gauge. However, balance between air pipe pressure and the water level may be broken due to dramatic changes of the water temperature, water density and water level, which will affect water level collecting accuracy. Therefore, at present, comparing a water level of a staff gauge observed and read manually with a water level collected by the automatic gauging station is the most efficient method for improving the water level collecting accuracy of the automatic gauging station.
[04] The more frequent comparison, the more accurate the water level data.
However, each comparison requires observation and reading by the professional personnel on site, and as water level distribution in the area of some navigation channels is dense, workload is relatively great, and mistakes are likely to occur during computation.
SUMMARY
[05] In order to solve the problems that an existing method for acquiring a water level wastes time and energy, has poor accuracy, and is prone to mistakes, or at least partly solve such problems, the embodiments of the present disclosure provide a method and device for automatically identifying a water level.
[06] According to a first aspect of the embodiments of the present disclosure, a method is provided for automatically identifying a water level. The method includes:
[07] extracting a staff gauge area from a staff gauge image to be identified of a first memory, dividing the staff gauge area into a plurality of band-shaped areas of a staff gauge head and a plurality of band-shaped areas of a staff gauge measurement part in the staff gauge area in a first processor, and storing the band-shaped areas in a second memory;
[08] acquiring, according to vectors composed of heights of all the band-shaped areas of the staff gauge head in the second memory, a staff gauge number corresponding to the vectors and a staff gauge zero-point elevation corresponding to the staff gauge number, where an association relation between the staff gauge number and the staff gauge zero-point elevation is stored in advance; and
[09] acquiring a last boundary, above a water surface, among boundaries of all the band-shaped areas of the staff gauge measurement part in the second memory, acquiring an intersection point of the last boundary and the water surface as well as a water level reading of the intersection point, adding the water level reading and the staff gauge zero- point elevation in a second processor to acquire a water level identification result of the staff gauge image to be identified, and displaying the result by a display terminal.
[10] According to a second aspect of the embodiments of the present disclosure, a device for automatically identifying a water level is provided and contains the following steps of work:
[11] extracting a staff gauge area from a staff gauge image to be identified, and dividing the staff gauge area into a plurality of band-shaped areas of a staff gauge head and a plurality of band-shaped areas of a staff gauge measurement part in the staff gauge area,
[12] acquiring, according to vectors composed of heights of all the band-shaped areas of the staff gauge head, a staff gauge number corresponding to the vectors and a staff gauge zero-point elevation corresponding to the staff gauge number, where an association relation between the staff gauge number and the staff gauge zero-point elevation is stored in advance; and
[13] acquiring a last boundary, above a water surface, in boundaries of all the band- shaped areas of the staff gauge measurement part, acquiring an intersection point of the last boundary and the water surface and a water level reading of the intersection point, and adding the water level reading and the staft gauge zero-point elevation to acquire a water level identification result of the staff gauge image to be identified.
[14] According to a third aspect of the embodiments of the present disclosure, electronic equipment is further provided. The electronic equipment includes a memory, a processor, and a computer program stored on the memory and operable on the processor, and the processor can call a program instruction to execute the method for automatically identifying a water level, which is provided by any one of various possible implementation modes in the first aspect.
[15] According to a fourth aspect of the embodiments of the present disclosure, a non-transient-state computer-readable storage medium is further provided. The non- transient-state computer-readable storage medium stores a computer instruction. The computer instruction makes a computer execute the method for automatically identifying a water level, which is provided by any one of various possible implementation modes in the first aspect.
[16] The embodiments of the present disclosure provide the method and device for automatically identifying a water level. According to the method, the collected staff gauge image to be identified is analyzed, the staff gauge number is acquired according to a feature of the staff gauge head in the staff gauge image to be identified, and then the staff gauge zero-point elevation corresponding to the staff gauge number 1s determined; and the water level reading on a staff gauge is determined according to the intersection point of the last boundary, above the water surface, of the staff gauge measurement part in the staff gauge image to be identified, and the water surface, the staff gauge zero-point elevation and the water level reading on the staff gauge are added, and a water level result is automatically identified according to a water level image to be identified. The method is simple, efficient highly accurate.
BRIEF DESCRIPTION OF THE DRAWINGS
[17] In order to describe a technical solution in the embodiments of the present disclosure or in the prior art more clearly, a brief introduction to the accompanying drawings required for the description of the embodiments or the prior art will be provided below. Obviously, the accompanying drawings in the following description are just some embodiments of the present disclosure. Those of ordinary skill in the art would also derive other accompanying drawings from these accompanying drawings without making inventive efforts.
[18] FIG. 1 is a schematic flowchart of an entire method for automatically identifying a water level provided in the embodiments of the present disclosure;
[19] FIG. 2 is a schematic structural diagram of a side expanded structure of a staff gauge in the method for automatically identifying a water level provided in the embodiments of the present disclosure;
[20] FIG. 3 is a schematic diagram of a gray image of a staff gauge area in the whole method for automatically identifying a water level provided in the embodiments of the present disclosure;
[21] FIG. 4 is a schematic diagram of an image of a horizontal edge point of the staff gauge area in the method for automatically identifying a water level provided in the embodiments of the present disclosure;
[22] FIG. 5 1s a schematic diagram of an overall structure of a device for automatically identifying a water level provided in the embodiments of the present disclosure; and
[23] FIG. 6 is a schematic diagram of an overall structure of electronic equipment provided in the embodiments of the present disclosure.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[24] In order to make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are some rather than all of the embodiments. Based on the embodiments of the present disclosure, all the other embodiments obtained by those of ordinary skill in the art without inventive effort should fall within the scope of the present disclosure.
[25] An embodiment of the present disclosure provides a method for automatically identifying a water level. FIG. 1 is a schematic flowchart of an entire method for automatically identifying a water level provided in the embodiment of the present disclosure. The method includes the following steps that S101, a staff gauge area is extracted from a staff gauge image to be identified, and the staff gauge area is divided into a plurality of band-shaped areas of a staff gauge head and a plurality of band-shaped areas of a staff gauge measurement part in the staff gauge area,
[26] where the staff gauge image to be identified is an image used for water level identification and including a staff gauge. In order to achieve automatic identification of the water level, the photographed staff gauge image to be identified is analyzed for the water level identification, thereby requiring a special staff gauge. The staff gauge includes a head and a measurement part, as shown in FIG. 2. The staff gauge has horizontal omnibearing visibility to facilitate identification at any angle, and the staff gauge includes a staff gauge number and a staff gauge measurement part, like a traditional staff gauge, to be compatible with a function of the traditional staff gauge. As shown in FIG. 2.
[27] According to the embodiment, the collected staff gauge image to be identified is analyzed, the staff gauge number is acquired according to a feature of the staff gauge head in the staff gauge image to be identified, and then a staff gauge zero-point elevation corresponding to the staff gauge number is determined; and a water level reading on the staff gauge is determined according to an intersection point of a last boundary, above a water surface, of the staff gauge measurement part in the staff gauge image to be identified, and the water surface, the staff gauge zero-point elevation and the water level reading on the staff gauge are added, and a water level result is automatically identified according to a water level image to be identified. The method is simple, efficient highly accurate.
[28] Based on the above embodiment, in the embodiment, each band-shaped area of the staff gauge head is in a first color or a second color, every two adjacent band- shaped areas of the staff gauge head are of different colors, and a boundary of each band- shaped area of the staff gauge head is arc-shaped; and each band-shaped area of the staff gauge measurement part is in a third color or a fourth color, every two adjacent band- shaped areas of the staff gauge measurement part are of different colors, and a boundary of each band-shaped area of the staff gauge measurement part is spiral. Accordingly, the step that a staff gauge area is extracted from a staff gauge image to be identified specifically includes the following steps that the staff gauge area is extracted from the staff gauge image to be identified according to a color of each band-shaped area of the staff gauge head and a color of each band-shaped area of the staff gauge measurement part.
[29] Specifically, as shown in FIG. 2, in the embodiment, in order to facilitate extraction of the staff gauge area and division of all the band-shaped areas of the staff gauge head and the staff gauge measurement part, every two adjacent band-shaped areas of the staff gauge head are of different colors, where areas filled with oblique lines are in the first color, such as blue, while areas filled with vertical lines are in the second color, such as red. Based on the above embodiment, in the embodiment, the step that the staff gauge area is divided into a plurality of band-shaped areas of a staff gauge head and a plurality of band-shaped areas of a staff gauge measurement part in the staff gauge area specifically includes the following steps that, based on a superpixel algorithm, the staff gauge area is divided into the plurality of band-shaped areas of the staff gauge head and the plurality of band-shaped areas of the staff gauge measurement part in the staff gauge area, where during the division, the staff gauge area is divided according to an energy function of similarity of neighboring pixels in the staff gauge area, and the energy function is optimized.
[30] Specifically, after the staff gauge area is acquired, the staff gauge area is divided according to the superpixel algorithm, during superpixel division, the staff gauge area is divided according to the energy function of the similarity of the neighboring pixels in the staff gauge area, and the energy function is further optimized, so as to accurately position the band-shaped areas of the staff gauge head and the band-shaped areas of the measurement part in the staff gauge area. Firstly, the staff gauge area is converted to a gray image, as shown in FIG. 3. Then, according to the gray image of the staff gauge area, edge points of the staff gauge area in a horizontal direction are computed, which are horizontal edge points. As shown in FIG. 4, the horizontal edge points are projected onto the horizontal direction, a phase angle of each horizontal edge point is recorded, and energy E(x) of the phase angle of each horizontal edge point is defined according to the following formula.
[31] Based on all the embodiments, in the embodiment, a step that a water level identification result of the staff gauge image to be identified is acquired specifically includes the following step that a water level identification result of a staff gauge image to be identified of any staff gauge photographed several times within a preset duration is acquired.
[32] Another embodiment of the present disclosure further provides a device for automatically identifying a water level. The device is used for implementing the method in the embodiments. Therefore, the description and definition in each embodiment of the method for automatically identifying a water level may be used for understanding each execution module in the embodiment of the present disclosure. FIG. 5 is a schematic diagram of an overall structure of the device for automatically identifying a water level provided in the embodiment of the present disclosure. The device includes an extraction module 501, an acquisition module 502 and an identification module 503.
[33] According to the embodiment, the collected staff gauge image to be identified is analyzed, the staff gauge number is acquired according to a feature of the staff gauge head in the staff gauge image to be identified, and then a staff gauge zero-point elevation corresponding to the staff gauge number is determined; and a water level reading on the staff gauge is determined according to an intersection point of a last boundary, above a water surface, of the staff gauge measurement part in the staff gauge image to be identified, and the water surface, the staft gauge zero-point elevation and the water level reading on the staff gauge are added, and a water level result is automatically identified according to a water level image to be identified. The method is simple, efficient highly accurate.
[34] The embodiment provides electronic equipment. FIG. 6 is a schematic diagram of an overall structure of the electronic equipment provided in the embodiments of the present disclosure. The equipment includes: at least processor 601, at least one memory 602 and a bus 603.
[35] Finally, it should be noted that the above embodiments are merely used to describe the technical solution of the present disclosure rather than limiting the same.
Although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that the technical solution described in the foregoing embodiments may still be modified, or some of the technical features therein may be equivalently replaced. However, these modifications or substitutions do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of each embodiment of the present disclosure.

Claims (5)

ConclusiesConclusions 1. Werkwijze voor het automatisch identificeren van een waterniveau, die het volgende omvat: het selecteren van een stafmetergebied uit een stafmeterafbeelding die geïdentificeerd dient te worden, uit een eerste geheugen, het verdelen van het stafmetergebied in een veelheid van bandvormige gebieden van een stafmeterkop en een veelheid van bandvormige gebieden van een stafmetermeetdeel in het stafmetergebied in een eerste processor en het opslaan van de bandvormige gebieden in een tweede geheugen; het volgens vectoren die samengesteld zijn uit hoogtes van alle bandvormige gebieden van de stafmeterkop in het tweede geheugen, verkrijgen van een stafmetergetal dat overeenkomt met de vectoren en een stafmeternulpunthoogte die overeenkomt met het stafmetergetal, waarbij een associatieverband tussen het stafmetergetal en de stafmeternulpunthoogte vooraf opgeslagen wordt; en het verkrijgen van een laatste grens, boven een wateroppervlak, onder grenzen van alle bandvormige gebieden van het stafmetermeetdeel in het tweede geheugen, het verkrijgen van een snijpunt van de laatste grens en het wateroppervlak alsmede een waterniveau-aflezing van het snijpunt, het toevoegen van de waterniveau-aflezing en de stafmeternulpunthoogte in een tweede processor om een waterniveau- identificatieresultaat van de stafmeterafbeelding die geïdentificeerd dient te worden, te verkrijgen en het weergeven van een resultaat door een weergave-eindinrichting.CLAIMS 1. A method for automatically identifying a water level, comprising: selecting a bar gauge area from a bar gauge image to be identified from a first memory, dividing the bar gauge area into a plurality of band-shaped areas of a bar gauge head and a plurality of band-shaped areas of a bar meter measuring portion in the bar meter area in a first processor and storing the band-shaped areas in a second memory; according to vectors composed of heights of all band-shaped areas of the scale head in the second memory, obtaining a scale number corresponding to the vectors and a scale zero point height corresponding to the scale number, wherein an association between the scale number and the scale zero point height is stored in advance ; and obtaining a final boundary, above a water surface, below boundaries of all band-shaped areas of the staff gauge measuring part in the second memory, obtaining an intersection of the final boundary and the water surface as well as a water level reading from the intersection, adding the water level reading and the bar gauge zero point height in a second processor to obtain a water level identification result of the bar gauge image to be identified and displaying a result by a display terminal. 2. Werkwijze voor het automatisch identificeren van een waterniveau volgens conclusie 1, waarbij, voor het selecteren van een stafmetergebied uit een stafmeteratbeelding die geïdentificeerd dient te worden, de werkwijze verder het volgende omvat: het voorverwerken van de stafmeterafbeelding die geïdentificeerd dient te worden, waarbij het voorverwerken vervormingscorrectie, grijsuitbreiding, binarisatie, erosie en skeletverdunning omvat.A method for automatically identifying a water level according to claim 1, wherein, for selecting a bar gauge area from a bar gauge image to be identified, the method further comprises: pre-processing the bar gauge image to be identified, wherein the preprocessing includes distortion correction, gray expansion, binarization, erosion and skeletal thinning. 3. Werkwijze voor het automatisch identificeren van een waterniveau volgens conclusie 1, waarbij elk bandvormige gebied van de stafmeterkop in een eerste kleur of een tweede kleur is, waarbij een grens van elk bandvormig gebied van de stafmeterkop boogvormig is, waarbij het stafmeter gebied verdeeld is, volgens de vectoren die samengesteld zijn uit de hoogtes van alle bandvormige gebieden van de stafmeterkop en volgens een vooraf ingestelde hoeveelheid van de bandvormige gebieden van de stafmeterkop en een vooraf ingestelde totale hoogte bovenste limiet van alle bandvormige gebieden van de stafmeterkop, waarbij een verzameling van alle vectoren die samengesteld zijn uit een vooraf ingestelde hoeveelheid van hoogtes waarvan een totale hoogte kleiner is dan de vooraf ingestelde totale hoogte bovenste limiet, bepaald wordt en waarbij de vectoren in de verzameling opeenvolgend zijn.A method for automatically identifying a water level according to claim 1, wherein each band-shaped area of the bar meter head is in a first color or a second color, wherein a boundary of each band-shaped area of the bar meter head is arcuate, wherein the bar meter area is divided , according to the vectors composed of the heights of all band-shaped areas of the bar meter head and according to a preset quantity of the band-shaped areas of the bar meter head and a preset total height upper limit of all band-shaped areas of the bar meter head, where a set of all vectors composed of a preset amount of heights whose total height is less than the preset total height upper limit is determined and where the vectors in the set are consecutive. 4. Werkwijze voor het automatisch identificeren van een waterniveau volgens een van de conclusies 1-3, waarbij, wanneer water in de stafmeterafbeelding die geïdentificeerd dient te worden doorzichtig is, krommingsveranderingen van alle punten bij de laatste grens verkregen worden en een punt met een maximale krommingsverandering dient als een snijpunt van de laatste grens en een wateroppervlak.A method of automatically identifying a water level according to any one of claims 1 to 3, wherein, when water in the bar gauge image to be identified is transparent, curvature changes of all points at the last boundary are obtained and a point with a maximum curvature change serves as an intersection of the final boundary and a water surface. 5. Inrichting voor het automatisch identificeren van een waterniveau, die het volgende omvat: een selectiemodule, een verkrijgingsmodule en een identificatiemodule.5. Device for automatically identifying a water level, comprising: a selection module, an acquisition module and an identification module.
NL2031937A 2022-05-19 2022-05-19 Method and device for automatically identifying water level NL2031937B1 (en)

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NL2031937A NL2031937B1 (en) 2022-05-19 2022-05-19 Method and device for automatically identifying water level

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