CN114187460A - Pointer type instrument reading method, device, equipment and medium integrating marking information - Google Patents
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Abstract
The invention discloses a pointer instrument reading method, a device, equipment and a medium for fusing marking information, wherein the method comprises the following steps: acquiring a pointer area picture based on a square code in a pointer instrument picture to be detected; matching the position information of the square codes in the pointer area picture of the pointer instrument to be detected with the position information of the square codes in the standard instrument picture, and calculating a radial transformation matrix from the pointer area picture of the pointer instrument to be detected to the standard instrument picture; performing transformation correction and pointer identification by using a radiation transformation matrix; and calculating the reading of the pointer according to the position information of the end points of the two scale marks closest to the pointer. The invention can be accurate to the minimum scale unit cell, and has higher accuracy; the relative position between the square lattice code and the end point of the scale line can be fixed by presetting the square lattice code; and finally, by means of batch production, the operation that a large number of preset point positions need to be configured manually in the current inspection system is omitted, and the workload is effectively reduced.
Description
Technical Field
The invention relates to the technical field of instruments and meters, in particular to a pointer instrument reading method, device, equipment and medium fusing marking information.
Background
Pointer meters are widely used in power systems, such as sulfur hexafluoride pressure gauges, lightning arrester meters, etc. in substations. If manual monitoring is adopted for identification and detection of the instruments, a large amount of manpower and material resources are required to be consumed, and data reading has large deviation. With the rapid development of electronic information technology, all industries are moving towards digitization and intellectualization. Under the scene of a transformer substation, an intelligent inspection system is gradually introduced, for example, an image acquisition device is installed on an inspection robot, the image acquisition device is used for acquiring dial plate images of a lightning arrester instrument, and reading is carried out by matching with some identification methods.
Although the specific implementation steps of the existing meter identification method are different, the whole idea and the technical route are different, for example, application numbers 202110698635.3, 202110637798.0, 202110822252.2 and 201711484281.2 are basically completed by purely depending on a digital image processing technology. The picture to be detected has a complex background, the picture has deviation or illumination change, and in addition, the problems of bad outdoor environment, various forms of the pointer and the like can cause great interference in the image processing process, so that the reading accuracy of the meter is poor, and the stability of the algorithm is not high.
For example, in patent CN202110655821.9, "pointer type meter physical information reading method based on coded mark information", although the coded mark is used, the following problems and disadvantages are present: the coding mark is pasted manually, so that the workload is large, the pasting position is easy to deviate, and the coding mark cannot be effectively applied in the actual transformer substation scene; the positions of the coding marks and the scales are not fixed, and the scales are required to be identified in the standard instrument picture by an image processing means; according to the technical scheme, only the characteristic calibration of two square codes is carried out, so that only homography transformation can be realized when the standard instrument picture and the to-be-detected graph are converted.
Disclosure of Invention
In order to solve the technical problem, the invention provides a pointer instrument reading method fusing marking information. In order to achieve the purpose, the technical scheme of the invention is as follows:
the pointer instrument reading method fusing the labeling information comprises the following steps:
acquiring a picture of a pointer instrument to be detected;
acquiring a pointer area picture based on a square code in a pointer instrument picture to be detected;
matching the position information of the square codes in the pointer area picture of the pointer instrument to be detected with the position information of the square codes in the standard instrument picture, and calculating a radial transformation matrix from the pointer area picture of the pointer instrument to be detected to the standard instrument picture;
transforming and correcting the pointer area picture of the pointer instrument to be detected by utilizing the radial transformation matrix;
performing pointer identification on the transformed pointer region picture;
and obtaining the position information of the end points of the two scale marks closest to the pointer according to the square codes, the scale marks and the relative position relation between the pointer, and calculating the reading of the pointer based on the position information of the two end points.
Preferably, the square lattice code is arranged at a specific position of the dial plate based on a manufacturing process in a production stage of the pointer type meter.
Preferably, the specific positions of the dial are three corners of the active identification area including the graduation marks, the hands and the hand readings.
Preferably, the effective identification area is rectangular.
Preferably, the step of matching the position information of the square code in the picture of the pointer area of the pointer instrument to be detected with the position information of the square code in the picture of the standard instrument and calculating the radial transformation matrix from the picture of the pointer area of the pointer instrument to be detected to the standard picture specifically includes the following steps:
acquiring pixel coordinates of each square code in a pointer area picture and a standard meter picture of a pointer type meter to be detected respectively to obtain pixel coordinate pairs of 4 vertexes in each square code;
and calculating a radial transformation matrix from the pointer area picture of the pointer instrument to be detected to the standard picture based on the pixel coordinate pairs and the affine transformation relation.
Preferably, the method for identifying the pointer comprises straight line detection and image segmentation.
Preferably, the calculation formula of the pointer reading y is as follows:
where l1 and l2 are the linear distances between the end points of the two scale lines closest to the pointer and the pointer, respectively, and l1 represents the linear distance between the end point of the two scale lines closer to the 0 scale line and the pointer, and i represents the corresponding reading value of the two scale lines closer to the 0 scale line.
Amalgamation mark information's pointer instrument reading device includes: the device comprises an acquisition module, a picture extraction module, a generation module, a transformation correction module, a pointer extraction module and a reading module, wherein:
the acquisition module is used for acquiring a picture of the pointer instrument to be detected;
the picture extraction module is used for acquiring a pointer area picture based on the square codes in the picture of the pointer instrument to be detected;
the generation module is used for matching the position information of the square codes in the pointer area picture of the pointer instrument to be detected with the position information of the square codes in the standard instrument picture and calculating a radial transformation matrix from the pointer area picture of the pointer instrument to be detected to the standard instrument picture;
the transformation correction module is used for transforming and correcting the pointer area picture of the pointer instrument to be detected by utilizing the radiation transformation matrix;
the pointer extraction module is used for carrying out pointer identification on the transformed pointer region picture;
and the reading module is used for obtaining the position information of two scale points closest to the pointer in the scale marks according to the relative position relationship among the square codes, the scale marks and the pointer and calculating the reading of the pointer based on the position information of the two end points.
A computer device, comprising: a memory for storing a computer program; and the processor is used for realizing any one of the pointer instrument reading methods fusing the annotation information when executing the computer program.
A readable storage medium having stored thereon a computer program which, when executed by a processor, implements any of the above-described methods of fusing annotated information for reading by a pointer instrument.
Based on the technical scheme, the invention has the beneficial effects that: the invention can be widely applied to pointer instrument equipment in a transformer substation scene, and can effectively ensure the precision and speed of intelligent reading of the pointer instrument equipment by utilizing the preposed meter square codes under the condition of minimum increase of cost. Compared with the traditional method for reading the meter by only depending on image processing software, the method effectively solves the problem that the meter reading of the intelligent patrol system under the substation scene is inaccurate, improves the accuracy of the meter reading under the scene by one grade, and provides a better solution for the pointer type meter reading under the intelligent substation patrol scene.
Drawings
FIG. 1 is a flow chart of a pointer instrument reading method incorporating annotation information in one embodiment;
FIG. 2 is a block diagram of a standard two-dimensional code;
FIG. 3 is a diagram of a dial plate with square codes added in the reading method of the pointer instrument with fused label information in one embodiment;
FIG. 4 is a diagram of the dial of FIG. 3 after the end points have been identified with emphasis;
FIG. 5 is a diagram of a pointer instrument to be detected collected in the pointer instrument reading method with the fused annotation information in one embodiment;
FIG. 6 is a photograph of the pointer region of FIG. 5;
FIG. 7 is a diagram illustrating matching of position information of a square code in a picture of a pointer area of a pointer instrument to be detected with position information of a square code in a picture of a standard instrument in the pointer instrument reading method with fused annotation information in one embodiment;
FIG. 8 is a picture of a pointer region after transform rectification using an affine transform matrix;
FIG. 9 is a schematic diagram of a pointer in the pointer-type meter reading method with the annotation information fused in one embodiment;
FIG. 10 is a diagram illustrating relationships between pointers, square codes and graduation lines in a pointer-type meter reading method incorporating annotation information in one embodiment;
FIG. 11 is a schematic diagram of the linear distance between the two end points a, b nearest to the pointer in the pointer-type meter reading method incorporating annotation information in one embodiment;
FIG. 12 is a diagram of an embodiment of an application environment of the pointer meter reading method with fused annotation information.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The embodiment of the invention provides a pointer instrument reading method fusing marking information, and particularly relates to a pointer instrument reading scene under a transformer substation scene. The technical scheme mainly comprises a hardware part and a software part, and is described in detail as follows:
hardware part: three check codes with remarkable characteristics are preset at the boundary of a pointer effective area of the traditional pointer type meter. The scheme is mainly inspired by two-dimensional codes, and as shown in fig. 2, the scheme is a structural diagram of a standard two-dimensional code. Fig. 2 is positioned at the upper left, upper right and lower left of the two-dimensional code and is called a Position Detection Pattern (Position Detection Pattern) which is used for quickly positioning the two-dimensional code image. According to the invention, by taking the positioning mode in the two-dimensional code as a reference, the square code convenient for subsequent algorithm identification and calculation is also preset at the boundary position of the pointer effective area of the pointer meter, and the shape and the position of the square code imitate the position detection graph in the two-dimensional code to be arranged. As shown in fig. 3. By the aid of the hardware specially enhanced for algorithm identification, a matched software system can quickly and accurately identify meter reading, and the influence of complexity of a production process is very little.
A software part: the specific processing flow is shown in fig. 1, and includes but is not limited to meter identification/extraction/correction, pointer identification, and meter reading, and can quickly and accurately read a pointer meter in the substation.
In order to more specifically explain the algorithm steps of the software flow, specific effects of each step in the algorithm are exemplified in the drawings, and the specific steps comprise;
step 1, for a pointer instrument with preset check code position information, the relative positions of the check code position and an end point of a scale mark in a dial are fixed, as shown in fig. 4 and 10, the end points are weighted and marked in the figures, and the real dial is not provided with weighted end points and is only used as an explanation; the square lattice code is set by depending on a manufacturing process in the production process of the pointer instrument, so that the workload is very little, and the relative fixation of the coded information on the dial plate can be effectively ensured;
step 2, sampling images of the pointer type meter marked with the square code information in the transformer substation through inspection equipment, and obtaining a picture of the pointer type meter to be detected as shown in FIG. 5;
step 3, the actual area of the meter can be quickly positioned through the preset square codes, and effective contents are extracted to obtain a pointer area picture as shown in fig. 6;
step 4, matching the position information of the square codes with the square codes of the standard instrument picture, as shown in fig. 7; a radial transformation matrix from the actual scene picture to the standard picture is calculated. Compared with other feature matching methods, the method based on the preset square codes has higher accuracy and higher speed due to the elimination of the interference of other features;
step 5, as shown in fig. 8, obtaining a correction result for the picture of the pointer instrument to be detected in the actual scene by using the affine transformation matrix; and performing subsequent reading operation on the basis;
step 6, firstly, identifying a pointer of the picture 8, wherein the method adopted in the step includes but is not limited to technologies of line detection, image segmentation and the like, the pointer can be extracted from the picture, and only the result of the pointer is shown as shown in fig. 9;
step 7, according to the step 1, the relative positions of the square codes and the scale marks are fixed, and according to the step, the relative position relationship between the identification pointer and the preset square codes can be calculated, and the specific meter reading is calculated by combining the position relationship between the identification pointer and the preset square codes, as shown in fig. 10;
step 8, obtaining two nearest end points a and b through the linear distance between the end point of each scale mark in the preset scales and the identification pointer, wherein the end point a is closer to the scale mark 0; FIG. 11 is a schematic diagram showing the linear distance between two end points a and b closest to the pointer; the formula for calculating the specific reading pointed to by the pointer is as follows:
wherein i represents the corresponding reading value of the smaller of the two endpoints; l1 and l2 are the linear distances between the end points a, b of the graduation marks and the pointer, respectively.
In one embodiment, a pointer instrument reading device fusing annotation information comprises: the device comprises an acquisition module, a picture extraction module, a generation module, a transformation correction module, a pointer extraction module and a reading module, wherein:
the acquisition module is used for acquiring a picture of the pointer instrument to be detected;
the picture extraction module is used for acquiring a pointer area picture based on the square codes in the picture of the pointer instrument to be detected;
the generation module is used for matching the position information of the square codes in the pointer area picture of the pointer instrument to be detected with the position information of the square codes in the standard instrument picture and calculating a radial transformation matrix from the pointer area picture of the pointer instrument to be detected to the standard instrument picture;
the transformation correction module is used for transforming and correcting the pointer area picture of the pointer instrument to be detected by utilizing the radiation transformation matrix;
the pointer extraction module is used for carrying out pointer identification on the transformed pointer region picture;
and the reading module is used for obtaining the position information of two scale points closest to the pointer in the scale marks according to the relative position relationship among the square codes, the scale marks and the pointer and calculating the reading of the pointer based on the position information of the two end points.
The apparatuses and modules illustrated in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions. One typical implementation device is a computer. In particular, the computer may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.
The pointer meter reading method incorporating annotation information in one embodiment can be applied in an application environment as shown in fig. 12. As shown in fig. 12, the application environment includes a computer device 110. The computer device 110 can obtain the picture of the pointer instrument to be detected; the computer device 110 may obtain a pointer region picture based on a square code in the picture of the pointer instrument to be detected; the computer device 110 may match the position information of the square code in the pointer region picture of the pointer instrument to be detected with the position information of the square code in the standard instrument picture, and calculate a radial transformation matrix from the pointer region picture of the pointer instrument to be detected to the standard instrument picture; the computer device 110 can utilize the radial transformation matrix to transform and correct the pointer area picture of the pointer instrument to be detected; the computer device 110 may perform pointer identification on the transformed pointer region picture; the computer device 110 may obtain the position information of the end points of the two scale lines closest to the pointer according to the square code, the relative position relationship between the scale lines and the pointer, and calculate the reading of the pointer based on the position information of the two end points, wherein the computer device 110 may be, but is not limited to, various personal computers, notebook computers, robots, tablet computers, and the like.
In one embodiment, a readable storage medium is provided, having stored thereon a computer program that, when executed by a processor, implements the pointer meter reading method as described above with fused annotation information.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present specification are all described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Claims (10)
1. The pointer instrument reading method fusing the labeling information is characterized by comprising the following steps:
acquiring a picture of a pointer instrument to be detected;
acquiring a pointer area picture based on a square code in a pointer instrument picture to be detected;
matching the position information of the square codes in the pointer area picture of the pointer instrument to be detected with the position information of the square codes in the standard instrument picture, and calculating a radial transformation matrix from the pointer area picture of the pointer instrument to be detected to the standard instrument picture;
transforming and correcting the pointer area picture of the pointer instrument to be detected by utilizing the radial transformation matrix;
performing pointer identification on the transformed pointer region picture;
and obtaining the position information of the end points of the two scale marks closest to the pointer according to the square codes, the scale marks and the relative position relation between the pointer, and calculating the reading of the pointer based on the position information of the two end points.
2. The pointer instrument reading method fusing the label information as claimed in claim 1, wherein the square code is set at a specific position of the dial plate based on a manufacturing process at a production stage of the pointer instrument.
3. The pointer instrument reading method with fused annotation information as claimed in claim 2, wherein the specific position of the dial is three corners of the effective identification area including the graduation lines, the pointer and the pointer reading.
4. The method of claim 3, wherein the effective identification area is rectangular.
5. The method for reading a pointer instrument with fused label information as claimed in claim 1, wherein the step of matching the position information of the square code in the picture of the pointer area of the pointer instrument to be detected with the position information of the square code in the picture of the standard instrument and calculating the radial transformation matrix from the picture of the pointer area of the pointer instrument to be detected to the standard picture comprises the following steps:
acquiring pixel coordinates of each square code in a pointer area picture and a standard meter picture of a pointer type meter to be detected respectively to obtain pixel coordinate pairs of 4 vertexes in each square code;
and calculating a radial transformation matrix from the pointer area picture of the pointer instrument to be detected to the standard picture based on the pixel coordinate pairs and the affine transformation relation.
6. The pointer instrument reading method with fused annotation information as claimed in claim 1, wherein the pointer identification method comprises straight line detection and image segmentation.
7. The method for reading by a pointer instrument fused with annotation information as claimed in claim 1, wherein the calculation formula of the pointer reading y is as follows:
where l1 and l2 are the linear distances between the end points of the two scale lines closest to the pointer and the pointer, respectively, and l1 represents the linear distance between the end point of the two scale lines closer to the 0 scale line and the pointer, and i represents the corresponding reading value of the two scale lines closer to the 0 scale line.
8. Amalgamation mark information's pointer instrument reading device, its characterized in that includes: the device comprises an acquisition module, a picture extraction module, a generation module, a transformation correction module, a pointer extraction module and a reading module, wherein:
the acquisition module is used for acquiring a picture of the pointer instrument to be detected;
the picture extraction module is used for acquiring a pointer area picture based on the square codes in the picture of the pointer instrument to be detected;
the generation module is used for matching the position information of the square codes in the pointer area picture of the pointer instrument to be detected with the position information of the square codes in the standard instrument picture and calculating a radial transformation matrix from the pointer area picture of the pointer instrument to be detected to the standard instrument picture;
the transformation correction module is used for transforming and correcting the pointer area picture of the pointer instrument to be detected by utilizing the radiation transformation matrix;
the pointer extraction module is used for carrying out pointer identification on the transformed pointer region picture;
and the reading module is used for obtaining the position information of two scale points closest to the pointer in the scale marks according to the relative position relationship among the square codes, the scale marks and the pointer and calculating the reading of the pointer based on the position information of the two end points.
9. A computer device, comprising: a memory for storing a computer program; a processor for implementing the method of reading a pointer instrument for fusing annotation information as claimed in any one of claims 1 to 7 when the computer program is executed.
10. A readable storage medium, characterized in that the readable storage medium has stored thereon a computer program which, when executed by a processor, implements the pointer instrument reading method of fusing annotation information according to any one of claims 1 to 7.
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