CN114022670A - Liquid level type transformer oil level indicator identification method and system - Google Patents
Liquid level type transformer oil level indicator identification method and system Download PDFInfo
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- CN114022670A CN114022670A CN202111310727.6A CN202111310727A CN114022670A CN 114022670 A CN114022670 A CN 114022670A CN 202111310727 A CN202111310727 A CN 202111310727A CN 114022670 A CN114022670 A CN 114022670A
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Abstract
The invention discloses a method and a system for identifying a liquid level type transformer oil level indicator, wherein the method comprises the following steps: acquiring an oil level image of an oil level gauge of the liquid level type transformer; meter positioning is carried out on an oil level image of the oil level meter, and a liquid level area image of the oil level meter is obtained; carrying out binarization processing on the liquid level region image to obtain a distribution rule of the liquid level region image in the vertical direction, and obtaining the pointer position through an inflection point; the reading value of the oil level gauge is acquired according to the boundary of the oil level image of the oil level gauge and the position of the pointer. Through the image data who acquires liquid level type transformer oil level gaugember, carry out the gaugember location and draw liquid level image area to the oil level gaugember in the image data, and then carry out binary processing, obtain oil level gaugember pointer reading, it acquires the accuracy to have the reading, can overcome day and night, light and illumination angle's influence, has improved the rate of accuracy that numerical value obtained, has promoted the security of transformer system operation.
Description
Technical Field
The invention relates to the technical field of power equipment detection, in particular to a method and a system for identifying a liquid level type transformer oil level indicator.
Background
The operation and maintenance of the substation equipment are important parts of the normal operation of the power system and are also important links for ensuring normal power supply of power enterprises. Most of the oil level gauges and other gauge gauges of the transformer substation have no remote transmission function due to the fact that the oil level gauges of the transformer substation are superior to history and cost reasons. Therefore, the transformer substation inspection mainly depends on manual inspection to ensure the safe and stable operation of the power equipment. In recent years, with the rapid development of the on-line inspection technology of robots and cameras, the workload of manual inspection is greatly reduced, the inspection efficiency is improved, the problem of the defect that manual inspection is difficult to find can be solved by combining an image processing technology, and the method has a wide practical prospect.
The transformer is one of the most important devices in the transformer substation, and the input of the indicating number of the related meter such as an oil level meter is an important link of the transformer substation inspection. However, there are currently significant difficulties in detecting and identifying the transformer oil level gauge reading. The oil level gauge and other gauges of the transformer are mostly located outdoors, the oil level gauge is detected and identified by adopting a traditional image processing method and is easily influenced by environmental illumination, particularly in scenes such as rail transit traction transformers, the requirements for identification in daytime and at night are also met, and missed identification or false detection is easy to occur in diversified complex scenes of a transformer substation.
Disclosure of Invention
The method and the system for identifying the oil level gauge of the liquid level type transformer have the advantages that the image data of the oil level gauge of the liquid level type transformer is obtained, gauge positioning is carried out on the oil level gauge in the image data, the liquid level image area is extracted, binarization processing is further carried out, the reading of a pointer of the oil level gauge is obtained, the reading obtaining is accurate, the influences of day and night, light and illumination angles can be overcome, the accuracy rate of numerical value obtaining is improved, and the running safety of a transformer system is improved.
In order to solve the above technical problem, a first aspect of an embodiment of the present invention provides a method for identifying an oil level gauge of a liquid level type transformer, including the steps of:
acquiring an oil level image of an oil level gauge of the liquid level type transformer;
meter positioning is carried out on an oil level image of the oil level meter, and a liquid level area image of the oil level meter is obtained;
carrying out binarization processing on the liquid level region image to obtain a distribution rule of the liquid level region image in the vertical direction, and obtaining a pointer position through an inflection point;
and acquiring the reading value of the oil level indicator according to the boundary of the oil level image of the oil level indicator and the position of the pointer.
Further, the acquiring oil level image data of the liquid level type transformer oil level gauge includes:
receiving a control instruction for acquiring the oil level reading value;
according to the control instruction, controlling an image acquisition component to acquire an oil level image of the oil level indicator;
wherein the image acquisition assembly comprises: high definition digtal camera and/or patrol and examine robot.
Further, the meter positioning of the oil level image of the oil level meter to obtain the image of the liquid level area of the oil level meter comprises:
acquiring the size, the position and the direction of a characteristic point in an oil level image and an oil level gauge template image by using an SIFT (scale invariant feature transform) characteristic extraction method, and acquiring a target candidate region of the oil level gauge by using Euclidean distance as similarity measurement;
and converting the target candidate area into the size same as the size of the oil level gauge template image through affine transformation to obtain the liquid level area image.
Further, before the binarization processing is performed on the liquid level region image, the method further includes:
and carrying out gray processing on the liquid level area image.
Further, the reading value v of the oil level gauge is calculated by the formula:
wherein h is the inflection point ordinate, R is the oil level measuring range, ymaxAnd yminRespectively, the ordinate corresponding to the maximum value and the minimum value of the oil level indicator.
Accordingly, a second aspect of embodiments of the present invention provides a level-type transformer oil level gauge identification system, comprising:
the image acquisition module is used for acquiring an oil level image of the oil level gauge of the liquid level type transformer;
the image positioning module is used for carrying out meter positioning on the oil level image of the oil level meter and acquiring a liquid level area image of the oil level meter;
the graphic processing module is used for carrying out binarization processing on the liquid level region image, acquiring a distribution rule of the liquid level region image in the vertical direction, and acquiring a pointer position through an inflection point;
and the data calculation module is used for acquiring the reading value of the oil level indicator according to the boundary of the oil level image of the oil level indicator and the position of the pointer.
Further, the image acquisition module includes:
an instruction receiving unit for receiving a control instruction for acquiring the oil level gauge reading value;
the control unit is used for controlling the image acquisition component to acquire the oil level image of the oil level indicator according to the control instruction;
wherein the image acquisition assembly comprises: high definition digtal camera and/or patrol and examine robot.
Further, the image localization module includes:
the characteristic extraction unit is used for acquiring the size, the position and the direction of characteristic points in the oil level image and the oil level gauge template image by utilizing an SIFT characteristic extraction method, and acquiring a target candidate region of the oil level gauge by adopting an Euclidean distance as a similarity measure;
and the image positioning unit is used for converting the target candidate region into the same size as the oil level gauge template image through affine transformation to obtain the liquid level region image.
Further, the graphics processing module includes:
the graying processing unit is used for performing graying processing on the liquid level area image;
and the binarization processing unit is used for carrying out binarization processing on the liquid level area image.
Further, the reading value v of the oil level gauge is calculated by the formula:
wherein h is the inflection point ordinate, R is the oil level measuring range, ymaxAnd yminRespectively, the ordinate corresponding to the maximum value and the minimum value of the oil level indicator.
The technical scheme of the embodiment of the invention has the following beneficial technical effects:
through the image data who acquires liquid level type transformer oil level gaugember, carry out the gaugember location and draw liquid level image area to the oil level gaugember in the image data, and then carry out binary processing, obtain oil level gaugember pointer reading, it acquires the accuracy to have the reading, can overcome day and night, light and illumination angle's influence, has improved the rate of accuracy that numerical value obtained, has promoted the security of transformer system operation.
Drawings
FIG. 1 is a flow chart of a method for identifying a level type transformer oil level gauge provided by an embodiment of the present invention;
FIG. 2 is logic of a level type transformer oil level gauge identification method provided by an embodiment of the present invention;
FIG. 3 is a schematic representation of an oil level gauge template image provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of the positioning results of an oil level gauge provided by an embodiment of the present invention;
FIG. 5 is a schematic view of a pointer level area provided by an embodiment of the present invention;
FIG. 6 is a block diagram of a level-type transformer oil level gauge identification system provided by an embodiment of the present invention;
FIG. 7 is a block diagram of an image acquisition module provided by an embodiment of the present invention;
FIG. 8 is a block diagram of an image location module provided by an embodiment of the invention;
FIG. 9 is a block diagram of a graphics processing module according to an embodiment of the present invention.
Reference numerals:
1. an image acquisition module 11, an instruction receiving unit 12, a control unit 2, an image positioning module 21, a feature extraction unit 22, an image positioning unit 3, an image processing module 31, a graying processing unit 32, a binarization processing unit 4, a data calculation module,
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Fig. 1 is a flow chart of a method for identifying a liquid level type transformer oil level gauge according to an embodiment of the invention.
Fig. 2 is logic of a method for identifying a level type transformer oil level gauge according to an embodiment of the present invention.
Referring to fig. 1 and fig. 2, a first aspect of the embodiments of the present invention provides a method, including the following steps:
s100, acquiring an oil level image of the oil level gauge of the liquid level type transformer.
And S200, meter positioning is carried out on the oil level image of the oil level meter, and a liquid level area image of the oil level meter is obtained.
S300, carrying out binarization processing on the liquid level area image, acquiring a distribution rule of the liquid level area image in the vertical direction, and acquiring the position of the pointer through an inflection point.
And S400, acquiring the reading value of the oil level indicator according to the boundary of the oil level image of the oil level indicator and the position of the pointer.
According to the identification method for the oil level gauge of the liquid level type transformer, the image data of the oil level gauge of the liquid level type transformer is obtained, gauge positioning is carried out on the oil level gauge in the image data, a liquid level image area is extracted, binarization processing is further carried out, the reading of an oil level gauge pointer is obtained, the reading obtaining accuracy is achieved, the influences of day and night, light and illumination angles can be overcome, the accuracy rate of obtaining numerical values is improved, and the safety of operation of a transformer system is improved.
Specifically, in step S100, acquiring oil level image data of the liquid level type transformer oil level gauge includes:
and S110, receiving a control command for acquiring an oil level reading value.
And S120, controlling the image acquisition component to acquire an oil level image of the oil level indicator according to the control instruction.
Wherein, the image acquisition subassembly includes: high definition digtal camera and/or patrol and examine robot.
Fig. 3 is a schematic diagram of an oil level gauge template image provided by an embodiment of the invention.
Fig. 4 is a schematic diagram of the positioning result of the oil level meter according to the embodiment of the invention.
FIG. 5 is a schematic diagram of a pointer level area provided by an embodiment of the present invention.
Specifically, referring to fig. 3, 4 and 5, in step S200, meter positioning is performed on the oil level image of the oil level meter to obtain an image of the liquid level area of the oil level meter, and the method includes:
s210, acquiring the size, the position and the direction of the characteristic points in the oil level image and the oil level gauge template image by using an SIFT characteristic extraction method, and acquiring a target candidate region of the oil level gauge by using Euclidean distance as similarity measurement.
And S220, converting the target candidate region into the image with the same size as the oil level gauge template image through affine transformation, and acquiring a liquid level region image.
Specifically, in step S300, before performing binarization processing on the liquid level region image, the method further includes:
and S301, carrying out gray processing on the liquid level area image.
Specifically, in step S400, the reading value v of the oil level gauge is calculated by the formula:
wherein h is the inflection point ordinate, R is the oil level measuring range, ymaxAnd yminRespectively, the ordinate corresponding to the maximum value and the minimum value of the oil level indicator.
FIG. 6 is a block diagram of a level-type transformer oil level gauge identification system provided by an embodiment of the present invention.
Accordingly, referring to fig. 6, a second aspect of the embodiments of the present invention provides a liquid level type transformer oil level gauge identification system, including:
an image acquisition module 1 for acquiring an oil level image of a liquid level type transformer oil level gauge;
the image positioning module 2 is used for carrying out meter positioning on an oil level image of the oil level meter and acquiring a liquid level area image of the oil level meter;
the graphic processing module 3 is used for carrying out binarization processing on the liquid level region image, acquiring a distribution rule of the liquid level region image in the vertical direction, and acquiring the position of the pointer through an inflection point;
and the data calculation module 4 is used for acquiring the reading value of the oil level indicator according to the boundary of the oil level image of the oil level indicator and the position of the pointer.
Fig. 7 is a block diagram of an image acquisition module according to an embodiment of the present invention.
Further, referring to fig. 7, the image obtaining module 1 includes:
an instruction receiving unit 11 for receiving a control instruction to acquire an oil level gauge reading value;
a control unit 12 for controlling the image acquisition assembly to acquire an oil level image of the oil level gauge according to a control instruction;
wherein, the image acquisition subassembly includes: high definition digtal camera and/or patrol and examine robot.
FIG. 8 is a block diagram of an image positioning module provided in an embodiment of the present invention
Further, referring to fig. 8, the image positioning module 2 includes:
a feature extraction unit 21 configured to obtain the size, position, and direction of a feature point in the oil level image and the oil level gauge template image by using a SIFT feature extraction method, and obtain a target candidate region of the oil level gauge by using an euclidean distance as a similarity measure;
and an image positioning unit 22 for obtaining a liquid level region image by converting the target candidate region into the same size as the oil level gauge template image by affine transformation.
FIG. 9 is a block diagram of a graphics processing module according to an embodiment of the present invention.
Further, referring to fig. 9, the graphics processing module 3 includes:
a graying processing unit 31 for performing graying processing on the liquid level region image;
and a binarization processing unit 32 for performing binarization processing on the liquid level region image.
Further, the reading value v of the oil level gauge is calculated by the formula:
wherein h is the inflection point ordinate, R is the oil level measuring range, ymaxAnd yminRespectively, the ordinate corresponding to the maximum value and the minimum value of the oil level indicator.
Accordingly, a third aspect of the embodiments of the present invention further provides an electronic device, including: at least one processor; and a memory coupled to the at least one processor; wherein the memory stores instructions executable by the one processor to cause the at least one processor to perform the above-described level-type transformer oil level gauge identification method.
Furthermore, a fourth aspect of the embodiments of the present invention also provides a computer-readable storage medium having stored thereon computer instructions that, when executed by a processor, implement the above-described level-type transformer oil level gauge identification method.
The embodiment of the invention aims to protect a method and a system for identifying a liquid level type transformer oil level indicator, wherein the method comprises the following steps: acquiring an oil level image of an oil level gauge of the liquid level type transformer; meter positioning is carried out on an oil level image of the oil level meter, and a liquid level area image of the oil level meter is obtained; carrying out binarization processing on the liquid level region image to obtain a distribution rule of the liquid level region image in the vertical direction, and obtaining the pointer position through an inflection point; the reading value of the oil level gauge is acquired according to the boundary of the oil level image of the oil level gauge and the position of the pointer. The technical scheme has the following effects:
through the image data who acquires liquid level type transformer oil level gaugember, carry out the gaugember location and draw liquid level image area to the oil level gaugember in the image data, and then carry out binary processing, obtain oil level gaugember pointer reading, it acquires the accuracy to have the reading, can overcome day and night, light and illumination angle's influence, has improved the rate of accuracy that numerical value obtained, has promoted the security of transformer system operation.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A method for identifying a liquid level type transformer oil level indicator is characterized by comprising the following steps:
acquiring an oil level image of an oil level gauge of the liquid level type transformer;
meter positioning is carried out on an oil level image of the oil level meter, and a liquid level area image of the oil level meter is obtained;
carrying out binarization processing on the liquid level region image to obtain a distribution rule of the liquid level region image in the vertical direction, and obtaining a pointer position through an inflection point;
and acquiring the reading value of the oil level indicator according to the boundary of the oil level image of the oil level indicator and the position of the pointer.
2. The method for identifying a liquid-level type transformer oil level gauge according to claim 1, wherein said obtaining an oil level image of the liquid-level type transformer oil level gauge comprises:
receiving a control instruction for acquiring the oil level reading value;
according to the control instruction, controlling an image acquisition component to acquire an oil level image of the oil level indicator;
wherein the image acquisition assembly comprises: high definition digtal camera and/or patrol and examine robot.
3. The method for identifying an oil level gauge of a level type transformer according to claim 1, wherein said meter positioning an oil level image of the oil level gauge to obtain an oil level gauge liquid level area image comprises:
acquiring the size, the position and the direction of a characteristic point in an oil level image and an oil level gauge template image by using an SIFT (scale invariant feature transform) characteristic extraction method, and acquiring a target candidate region of the oil level gauge by using Euclidean distance as similarity measurement;
and converting the target candidate area into the size same as the size of the oil level gauge template image through affine transformation to obtain the liquid level area image.
4. The method for identifying a liquid level type transformer oil level gauge according to claim 1, wherein before the binarizing process on the liquid level area image, the method further comprises:
and carrying out gray processing on the liquid level area image.
5. The liquid level type transformer oil level gauge identification method according to claim 1,
the calculation formula of the reading value v of the oil level indicator is as follows:
wherein h is the inflection point ordinate, R is the oil level measuring range, ymaxAnd yminRespectively, the ordinate corresponding to the maximum value and the minimum value of the oil level indicator.
6. A liquid level type transformer oil level indicator recognition system, comprising:
the image acquisition module is used for acquiring an oil level image of the oil level gauge of the liquid level type transformer;
the image positioning module is used for carrying out meter positioning on the oil level image of the oil level meter and acquiring a liquid level area image of the oil level meter;
the graphic processing module is used for carrying out binarization processing on the liquid level region image, acquiring a distribution rule of the liquid level region image in the vertical direction, and acquiring a pointer position through an inflection point;
and the data calculation module is used for acquiring the reading value of the oil level indicator according to the boundary of the oil level image of the oil level indicator and the position of the pointer.
7. The fluid level type transformer oil level gauge identification system of claim 6, wherein the image acquisition module comprises:
an instruction receiving unit for receiving a control instruction for acquiring the oil level gauge reading value;
the control unit is used for controlling the image acquisition component to acquire the oil level image of the oil level indicator according to the control instruction;
wherein the image acquisition assembly comprises: high definition digtal camera and/or patrol and examine robot.
8. The fluid level type transformer oil level gauge identification system of claim 6, wherein the image localization module comprises:
the characteristic extraction unit is used for acquiring the size, the position and the direction of characteristic points in the oil level image and the oil level gauge template image by utilizing an SIFT characteristic extraction method, and acquiring a target candidate region of the oil level gauge by adopting an Euclidean distance as a similarity measure;
and the image positioning unit is used for converting the target candidate region into the same size as the oil level gauge template image through affine transformation to obtain the liquid level region image.
9. The fluid level type transformer oil level gauge identification system of claim 6, wherein the graphics processing module comprises:
the graying processing unit is used for performing graying processing on the liquid level area image;
and the binarization processing unit is used for carrying out binarization processing on the liquid level area image.
10. The level-type transformer oil level gauge identification system of claim 6,
the calculation formula of the reading value v of the oil level indicator is as follows:
wherein h is the inflection point ordinate, R is the oil level measuring range, ymaxAnd yminRespectively, the ordinate corresponding to the maximum value and the minimum value of the oil level indicator.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111950558A (en) * | 2020-08-26 | 2020-11-17 | 上海申瑞继保电气有限公司 | High-voltage oil-immersed transformer oil liquid level image identification method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111950558A (en) * | 2020-08-26 | 2020-11-17 | 上海申瑞继保电气有限公司 | High-voltage oil-immersed transformer oil liquid level image identification method |
| CN111950558B (en) * | 2020-08-26 | 2024-02-09 | 上海申瑞继保电气有限公司 | High-pressure oil immersed transformer oil liquid level image identification method |
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