CN114359573A - Pointer meter reading identification method and device and storage medium - Google Patents
Pointer meter reading identification method and device and storage medium Download PDFInfo
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Abstract
The disclosure relates to the field of computers, and discloses a pointer meter reading identification method, a pointer meter reading identification device and a storage medium, wherein the method comprises the following steps: identifying the image containing the pointer meter to obtain the simulation range and the simulation pointer, fitting the simulation range and the simulation pointer to obtain the simulation pointer meter, and obtaining the intersection point of the analog pointer and the analog measuring range, determining the reading of the first pointer meter based on the arc length formed on the analog pointer meter by the intersection point and the measuring range starting point, and determining a second pointer meter reading based on the included angles between the simulation circle center of the simulation pointer meter and the connection lines between the simulation pointer, the measurement range starting point and the measurement range ending point respectively, determining a target reading of the pointer meter based on the first pointer meter reading and the second pointer meter reading, the reading identification process of the pointer meter adopts the mode of determining the reading of the pointer meter according to the arc length and the included angle, and the average value of the readings of the pointer meter in the two modes is used as the final target reading of the pointer meter, so that the accuracy and the reliability of the readings of the pointer meter are guaranteed.
Description
Technical Field
The disclosure relates to the technical field of computers, and provides a pointer meter reading identification method, a pointer meter reading identification device and a storage medium.
Background
The meter is a common measuring tool in various industries, and for example, consumption conditions of water, electricity, gas and the like can be known through the meter. In the practical application process, images of water, electricity, gas, a pressure gauge and the like are collected through terminal equipment such as a camera and the like, and then an instrument photo is identified by utilizing an image identification technology to obtain a reading. The identification process has the characteristics of wide application range, simplicity in installation, easiness in use and the like.
However, because the meter is divided into a number indicating meter and a pointer meter, compared with the number indicating meter, the meter can obtain a reading by directly performing OCR character detection through reading recognition, and the difficulty of recognition of the pointer meter is as follows: the reading of the pointer meter needs to be approximately estimated according to the deflection angle of the pointer. Therefore, the dial, the pointer and the meter measuring range need to be accurately positioned and relative position relation operation is carried out, the algorithm link is long, and the possibility of introducing errors is high.
At present, there are two main schemes for reading identification of a pointer meter: 1. a method based on conventional image processing. The scheme has high requirement on environment, insufficient precision and low reliability. 2. And (3) modeling by combining deep learning with an image processing method. The existing scheme combining deep learning with image processing has the main defect of unreasonable modeling, namely the scheme takes scales as points of a polygon, and a connecting line between the scale points is taken as the side of the polygon to approximately replace a range major arc, so that the larger the distance between two end points of a straight line is, the larger the approximate error is, and the corresponding phenomena of low robustness, large error, low reliability and the like can be generated, and finally the actual application scene can not be met.
In summary, no effective solution is available at present to ensure the accuracy and reliability of the pointer table in the reading identification process.
Disclosure of Invention
The embodiment of the disclosure provides a reading identification method and device for a pointer meter and a storage medium, which are used for improving the accuracy and reliability of the pointer meter in the reading identification process.
The specific technical scheme provided by the disclosure is as follows:
in a first aspect, an embodiment of the present disclosure provides a pointer meter reading identification method, where the method is applied to a computing device, and includes:
identifying an image containing a pointer meter to obtain an analog range and an analog pointer, and fitting the analog range and the analog pointer to obtain the analog pointer meter, wherein the analog range is an arc line used for representing a range starting point, a range end point and a range length of the pointer meter, and the analog pointer is used for representing the direction of a pointer head of the pointer meter on the analog range;
acquiring an intersection point of the analog pointer and the analog range, and determining the reading of the first pointer meter based on the arc length formed on the analog pointer meter by the intersection point and the range starting point;
determining the reading of a second pointer meter based on the included angles of the simulation circle center of the simulation pointer meter and the connecting lines among the simulation pointer, the range starting point and the range ending point respectively;
based on the first pointer meter reading and the second pointer meter reading, a target reading of the pointer meter is determined.
Optionally, identifying an image containing a pointer table to obtain an analog range and an analog pointer, includes:
identifying the image containing the pointer table through a semantic segmentation model to obtain an analog range; and
and identifying the image containing the pointer table through the pointer target detection model to obtain the simulated pointer.
Optionally, before identifying the image containing the pointer table and obtaining the analog measurement range and the analog pointer, the method further includes:
and acquiring an instrument image acquired by front-end equipment, carrying out target detection on the instrument image through a pointer table target detection model, and intercepting an image containing a pointer table based on a target detection result.
Optionally, fitting the analog range and the analog pointer to obtain an analog pointer table, including:
carrying out graphic and graphic operations on the analog range and the analog pointer respectively to obtain the analog range and the analog pointer after noise points are removed;
connecting the simulation circle center and the intersection point to obtain an adjusted simulation pointer;
detecting the simulation measuring range by using the Thomas angular point to obtain a measuring range starting point, a measuring range end point and a measuring range length;
and fitting the analog range, the adjusted analog pointer, the range starting point, the range end point and the range length by using cumulative probability Hough transform to obtain the analog pointer meter.
Optionally, obtaining an intersection of the analog pointer and the analog range, and determining a first pointer reading based on an arc length formed on the analog pointer by the intersection and the range starting point, includes:
determining a first connecting line based on the simulation circle center and the range starting point, and determining a second connecting line based on the simulation circle center and the range end point;
determining a first arc line of the intersection point of the simulation pointer and the starting point of the measuring range on the measuring range length, determining a second arc line of the intersection point of the simulation pointer and the ending point of the measuring range on the measuring range length, and calculating the arc sum of the first arc line and the second arc line;
respectively determining a first position relation between the intersection point of the simulation pointer and the first connecting line and a second position relation between the intersection point of the simulation pointer and the second connecting line;
if the first position relation and the second position relation represent that the distance between the simulated pointer and the measuring range starting point is smaller than the distance between the simulated pointer and the measuring range end point, determining the reading of the first pointer meter based on the sum of the first arc line and the arc line;
and if the first position relation and the second position relation represent that the distance between the simulated pointer and the measuring range starting point is larger than the distance between the simulated pointer and the measuring range ending point, determining the reading of the first pointer meter based on the sum of the second arc line and the arc line.
Optionally, determining a reading of the second pointer meter based on angles between a simulation center of the simulation pointer meter and connection lines between the simulation pointer, the measurement range starting point, and the measurement range ending point respectively includes:
respectively calculating a first included angle between the first line segment and the second line segment, a second included angle between the first line segment and the third line segment, and a third included angle between the second line segment and the third line segment; the first line segment is a line segment between the simulation circle center of the simulation pointer meter and the intersection point of the simulation pointer, the second line segment is a line segment between the simulation circle center of the simulation pointer meter and the measuring range starting point, and the third line segment is a line segment between the simulation circle center of the simulation pointer meter and the measuring range end point;
if the first included angle is larger than or equal to the second included angle, determining the reading of a second pointer meter based on the second included angle, the third included angle, the error offset corresponding to the first included angle and the error offset corresponding to the second included angle;
if the first included angle is smaller than or equal to the second included angle, determining the reading of a second pointer meter based on the first included angle, the third included angle, the error offset corresponding to the first included angle and the error offset corresponding to the second included angle;
the error offset corresponding to the first included angle represents the angle offset corresponding to the position difference between the analog pointer and the adjusted analog pointer on the analog measuring range, and the error offset corresponding to the second included angle represents the angle offset corresponding to the analog measuring range.
Optionally, determining a target reading of the pointer table based on the first pointer table reading and the second pointer table reading comprises:
and determining the average value of the first pointer meter reading and the second pointer meter reading as the target reading of the pointer meter.
In a second aspect, an embodiment of the present disclosure further provides a pointer meter reading identification device, including:
the identification unit is used for identifying the image containing the pointer meter to obtain an analog range and an analog pointer, and fitting the analog range and the analog pointer to obtain the analog pointer meter, wherein the analog range is an arc line used for representing a range starting point, a range end point and a range length of the pointer meter, and the analog pointer is used for representing the pointing direction of a pointer head of the pointer meter on the analog range;
the first reading unit is used for acquiring an intersection point of the analog pointer and the analog range and determining the reading of the first pointer meter based on the arc length formed on the analog pointer meter by the intersection point and the range starting point;
the second reading unit is used for determining the reading of the second pointer meter based on the included angles between the simulation circle center of the simulation pointer meter and the connecting lines among the simulation pointer, the measuring range starting point and the measuring range terminal point;
and the reading determining unit is used for determining the target reading of the pointer table based on the first pointer table reading and the second pointer table reading.
Optionally, the image including the pointer table is identified to obtain the analog range and the analog pointer, and the identifying unit is configured to:
identifying the image containing the pointer table through a semantic segmentation model to obtain an analog range; and
and identifying the image containing the pointer table through the pointer target detection model to obtain the simulated pointer.
Optionally, before identifying the image containing the pointer table and obtaining the analog measurement range and the analog pointer, the method further includes:
and acquiring an instrument image acquired by front-end equipment, carrying out target detection on the instrument image through a pointer table target detection model, and intercepting an image containing a pointer table based on a target detection result.
Optionally, fitting the analog range and the analog pointer to obtain an analog pointer table, and the identification unit is configured to:
respectively carrying out image graphic operation on the analog range and the analog pointer to obtain the analog range and the analog pointer after noise points are removed;
connecting the simulation circle center and the intersection point to obtain an adjusted simulation pointer;
detecting the simulation measuring range by using the Thomas angular point to obtain a measuring range starting point, a measuring range end point and a measuring range length;
and fitting the analog range, the adjusted analog pointer, the range starting point, the range end point and the range length by using cumulative probability Hough transform to obtain the analog pointer meter.
Optionally, an intersection of the analog pointer and the analog range is obtained, and a first pointer reading is determined based on an arc length formed on the analog pointer by the intersection and the range starting point, and the first reading unit is configured to:
determining a first connecting line based on the simulation circle center and the range starting point, and determining a second connecting line based on the simulation circle center and the range end point;
determining a first arc line of the intersection point of the simulation pointer and the starting point of the measuring range on the measuring range length, determining a second arc line of the intersection point of the simulation pointer and the ending point of the measuring range on the measuring range length, and calculating the arc sum of the first arc line and the second arc line;
respectively determining a first position relation between the intersection point of the simulation pointer and the first connecting line and a second position relation between the intersection point of the simulation pointer and the second connecting line;
if the first position relation and the second position relation represent that the distance between the simulated pointer and the measuring range starting point is smaller than the distance between the simulated pointer and the measuring range end point, determining the reading of the first pointer meter based on the sum of the first arc line and the arc line;
and if the first position relation and the second position relation represent that the distance between the simulated pointer and the measuring range starting point is larger than the distance between the simulated pointer and the measuring range ending point, determining the reading of the first pointer meter based on the sum of the second arc line and the arc line.
Optionally, the reading of the second pointer meter is determined based on angles between the simulation center of the simulation pointer meter and connection lines between the simulation pointer, the measurement range starting point and the measurement range ending point, respectively, and the second reading unit is configured to:
respectively calculating a first included angle between the first line segment and the second line segment, a second included angle between the first line segment and the third line segment, and a third included angle between the second line segment and the third line segment; wherein the first line segment is a line segment between the simulation circle center of the simulation pointer meter and the intersection point of the simulation pointer, the second line segment is a line segment between the simulation circle center of the simulation pointer meter and the starting point of the measuring range, and the third line segment is a line segment between the simulation circle center of the simulation pointer meter and the end point of the measuring range;
if the first included angle is larger than or equal to the second included angle, determining the reading of a second pointer meter based on the second included angle, the third included angle, the error offset corresponding to the first included angle and the error offset corresponding to the second included angle;
if the first included angle is smaller than or equal to the second included angle, determining the reading of a second pointer meter based on the first included angle, the third included angle, the error offset corresponding to the first included angle and the error offset corresponding to the second included angle;
the error offset corresponding to the first included angle represents the angle offset corresponding to the position difference between the analog pointer and the adjusted analog pointer on the analog measuring range, and the error offset corresponding to the second included angle represents the angle offset corresponding to the analog measuring range.
Optionally, a target reading of the pointer table is determined based on the first pointer table reading and the second pointer table reading, and the reading determination unit is configured to:
and determining the average value of the first pointer meter reading and the second pointer meter reading as the target reading of the pointer meter.
In a third aspect, a computing device, comprises:
a memory for storing executable instructions;
a processor for reading and executing executable instructions stored in the memory to implement a method as in any one of the first aspect.
In a fourth aspect, a computer-readable storage medium, wherein instructions, when executed by a processor, enable the processor to perform the method of any of the first aspect.
The beneficial effects of this disclosure are as follows:
in summary, in the embodiments of the present disclosure, a method, an apparatus, and a storage medium for identifying reading of a pointer meter are provided, where the method for identifying reading of a pointer meter includes: identifying an image containing a pointer meter to obtain an analog range and an analog pointer, fitting the analog range and the analog pointer to obtain an analog pointer meter, wherein the analog range is an arc line used for representing a range starting point, a range end point and a range length of the pointer meter, the analog pointer is used for representing the direction of a pointer head of the pointer meter on the analog range, an intersection point of the analog pointer and the analog range is obtained, a first pointer meter reading is determined based on an arc length formed on the analog pointer meter by the intersection point and the range starting point, a second pointer meter reading is determined based on an included angle formed by a simulation circle center of the analog pointer meter and a connecting line between the analog pointer, the range starting point and the range end point respectively, a target pointer reading of the pointer meter is determined based on the first pointer meter reading and the second pointer meter reading, and a mode of determining the pointer meter reading according to the arc length and the included angle is adopted in the meter reading identification process respectively, and the average value of the two modes is used as the final target reading of the pointer table, so that the accuracy and the reliability of the pointer table in the reading identification process are guaranteed.
Additional features and advantages of the disclosure will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the disclosure. The objectives and other advantages of the disclosure may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure. In the drawings:
FIG. 1 is a schematic diagram of a system architecture for identifying pointer meter readings in an embodiment of the present disclosure;
FIG. 2 is a schematic flow chart illustrating identification of pointer meter readings according to an embodiment of the present disclosure;
FIG. 3 is a schematic flow chart illustrating obtaining an analog pointer table according to an embodiment of the disclosure;
FIG. 4 is a schematic flow chart illustrating the process of obtaining the reading of the first pointer table according to the embodiment of the disclosure;
FIG. 5 is a schematic flow chart illustrating the process of obtaining a second pointer reading in an embodiment of the present disclosure;
FIG. 6 is a schematic diagram illustrating a logic structure of a reading identifier of a pointer table according to an embodiment of the present disclosure;
fig. 7 is a block diagram of a computing device according to an embodiment of the disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some embodiments, but not all embodiments, of the technical solutions of the present disclosure. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments described in the present disclosure without any creative effort belong to the protection scope of the technical solution of the present disclosure.
The terms "first," "second," and the like in the description and in the claims, and in the drawings described above, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein.
Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1, in the embodiment of the present disclosure, a system includes at least one meter, a front-end device and a computing device, and in fig. 1, various meters with pointers in industrial applications, such as a pressure gauge, a water meter, etc., are exemplarily represented by the meter. In the implementation process, the front-end device is used for collecting images of the instrument, the common front-end device is a camera, a video recorder and the like, and after the front-end device collects the images of the instrument, the images of the instrument are sent to the computing device for identification so as to obtain the reading of the pointer meter.
The following specifically describes a case where the pointer table reading identification method is performed by the computing device. Referring to fig. 2, in the embodiment of the present disclosure, a specific process of identifying the reading of the pointer meter by the computing device is as follows:
step 201: the method comprises the steps of identifying an image containing a pointer meter to obtain an analog range and an analog pointer, fitting the analog range and the analog pointer to obtain the analog pointer meter, wherein the analog range is an arc line used for representing a range starting point, a range end point and a range length of the pointer meter, and the analog pointer is pointed by a pointer head used for representing the pointer meter on the analog range.
In view of the wide variety of meters in industrial production, the location and role of the installed meters in the production facility also vary. In order to unify the images to be processed and containing the pointer table obtained by the computing device, in the implementation process, before identifying the images containing the pointer table and obtaining the analog measuring range and the analog pointer, the method further comprises the following steps:
and acquiring an instrument image acquired by front-end equipment, carrying out target detection on the instrument image through a pointer table target detection model, and intercepting an image containing a pointer table based on a target detection result.
It should be noted here that the instrument image acquired by the front-end device is an original image containing a complex background acquired by the front-end device directly shooting the instrument. Due to factors such as different completeness of the instruments, different models of the front-end equipment, different distances between the front-end equipment and the instruments, instrument images acquired by the front-end equipment are different.
In implementation, the pointer meter target detection model based on yolov5 can be used for carrying out target detection on the meter image, so that the influence of other parts (such as a meter supporting rod and the like) in the meter image is removed, and the meter image only containing the original dial and the original pointer is obtained.
After obtaining the image containing the pointer table, identifying the image containing the pointer table to obtain the analog measuring range and the analog pointer, and the method comprises the following steps:
(1) identifying the image containing the pointer table through a semantic segmentation model to obtain an analog range; and
because, the dial plate among the industrial instrument is mostly the arc line that contains the initial point and the termination point, in the in-process of discerning pointer table reading, must confirm the dial plate that contains in this instrument image earlier and the range of dial plate. In a specific implementation process, the image containing the pointer table is identified through a semantic segmentation model to obtain a simulation range, namely, arcs included in the image containing the pointer table are distinguished, generally, the arcs obtained after semantic segmentation are wide, namely, the simulation range is generally composed of at least two corresponding arcs and a filling area between the arcs.
(2) And identifying the image containing the pointer table through the target detection model to obtain a pointer target simulation pointer.
In the process of identifying the reading of the pointer meter, besides the range simulation range of the pointer meter, the specific direction of the pointer on the dial of the pointer meter needs to be determined, in the implementation process, the image containing the pointer meter is identified through a target detection model to obtain the simulated pointer, wherein the target detection model is a pre-trained model set for the position of the pointer. For the pointer target, the pointer region is segmented from the background by adopting an adaptive threshold segmentation method.
On the basis of obtaining the analog range and the analog pointer, fitting the analog range and the analog pointer to obtain an analog pointer table, as shown in fig. 3, specifically including:
step 2011: and respectively carrying out graphic and graphic operations on the analog range and the analog pointer to obtain the analog range and the analog pointer after noise points are removed.
Considering the above-mentioned detected analog range and analog pointer, there may be a plurality of noises caused by damage or stain on the original pointer table. Therefore, in the implementation process, the graphic and graphic operations are respectively performed on the analog range and the analog pointer, specifically, after the opening operation and the closing operation are performed on the graphic region where the analog range and the analog pointer are located, the maximum connected domain is found to remove the noise therein, so that the analog range and the analog pointer after the noise is removed are obtained.
Step 2012: and connecting the simulation circle center and the intersection point to obtain the adjusted simulation pointer.
In the implementation process, in order to ensure the integrity of the simulation pointer, the complete direction of the simulation pointer can be further determined on the basis of obtaining the simulation pointer, specifically: the method comprises the steps of firstly obtaining the intersection point of the simulation pointer and the simulation range, namely locking the pointing point of the simulation pointer, then connecting the obtained simulation circle center and the intersection point to obtain the adjusted simulation pointer, namely using the line segment between the intersection point and the simulation circle center as the complete simulation pointer.
Step 2013: and detecting the simulation measuring range by using the Thomas angular point to obtain a measuring range starting point, a measuring range terminal point and a measuring range length.
Because the instruments in the industry are all graduated, and most instruments used in the industry are dials in sector areas, in the implementation process, the thomas angular points are used for detecting the analog measuring range, namely, the function cv.
Step 2014: and fitting the analog range, the adjusted analog pointer, the range starting point, the range end point and the range length by using cumulative probability Hough transform to obtain the analog pointer meter.
After the analog pointer, the analog range, and the range start point, the range end point, and the range length on the analog range are obtained through steps 2012 and 2013, respectively, they need to be further combined into an analog pointer table, and in the implementation process, the analog range, the adjusted analog pointer, the range start point, the range end point, and the range length are fitted by using the cumulative probability hough transform, that is, the analog pointer and the analog range are fitted by using the function cv2.houghlinesp (), so that the analog pointer table is obtained.
In order to obtain accurate readings of the pointer table, in the embodiment of the application, the readings of the pointer table are respectively obtained by respectively adopting two index parameters, namely the arc length and the included angle, and finally the final reading of the pointer table is determined based on the readings of the pointer table obtained by the two modes. The use of arc length to obtain the reading of the pointer table is described below.
Step 202: and acquiring an intersection point of the analog pointer and the analog range, and determining the reading of the first pointer meter based on the arc length formed on the analog pointer meter by the intersection point and the range starting point.
Since the recognized analog pointer is usually an irregular rectangle including the pointer head, that is, the analog pointer at least includes the pointing direction of the pointer head on the analog range, it cannot be determined whether the analog pointer intersects with the analog circle center corresponding to the analog range. Therefore, the intersection point of the analog pointer and the analog range is obtained by intersecting the analog pointer or the extension line of the analog pointer and the analog range.
In the implementation process, the step of obtaining the reading of the pointer table by using the arc length is shown in fig. 4, and specifically includes:
step 2021: the first connecting line is determined based on the simulated circle center and the range starting point, and the second connecting line is determined based on the simulated circle center and the range end point.
Considering that the measuring ranges of the arc lines are different in length, in the implementation process, the dividing lines of the different arc lines are determined through the simulation circle center, the measuring range starting point and the measuring range ending point on the simulation measuring range.
Specifically, the simulated circle center and the span start point are connected to obtain a first connection line, which is typically used as a reference line to obtain an arc for indicating a reading when rotating clockwise from the span start point. And, simulating the center of the circle and the end of the range, resulting in a second connecting line that generally serves as a reference line for obtaining an arc for indicating a reading when rotated counterclockwise from the end of the range.
Step 2022: and determining a first arc line of the intersection point of the analog pointer and the starting point of the measuring range on the measuring range length, determining a second arc line of the intersection point of the analog pointer and the ending point of the measuring range on the measuring range length, and calculating the arc sum of the first arc line and the second arc line.
Since the intersection of the analog pointer is on the analog scale, in practice, the arc between the intersection of the analog pointer and the start of the scale on the analog scale can be used to characterize the scale the analog pointer has traveled, i.e., the pointer meter reading.
Considering that the simulation measuring range is in a shape similar to a circle, in order to simplify calculation, in the implementation process, whether the simulation pointer is close to the starting point of the measuring range or is closer to the end point of the measuring range is judged, and then the reading of the pointer meter is calculated according to the arc length formed by the intersection point of the simulation pointer on the simulation measuring range. Specifically, a first arc line formed between the intersection point of the analog pointer and the starting point of the range is determined on the analog range, and a second arc line formed between the intersection point of the analog pointer and the ending point of the range is determined on the analog range. In addition, the sum of the arcs of the first arc and the second arc needs to be calculated, and the sum of the arcs is used as an angle for judging the correspondence of the first arc or the second arc on the simulation measuring range.
Step 2023: and respectively determining a first position relation between the intersection point of the simulation pointer and the first connecting line and a second position relation between the intersection point of the simulation pointer and the second connecting line.
In implementation, the coordinates of the intersection point of the analog pointer are substituted into the first connecting line, so as to determine whether the intersection point of the analog pointer is on the first connecting line or on the left side or the right side of the first connecting line, and further determine the first position relationship between the intersection point of the analog pointer and the first connecting line. For example, if the intersection of the analog pointer is on the first connecting line, it indicates that the pointer is still at the position of the beginning of the range, and the pointer meter reading is zero.
Similarly, the coordinates of the intersection point of the analog pointer are substituted into the second connecting line, thereby determining whether the intersection point of the analog pointer is on the second connecting line or on the left or right side of the second connecting line, so as to further determine a second positional relationship between the intersection point of the analog pointer and the second connecting line. For example, if the intersection point of the analog pointer is on the second connecting line, the pointer is still at the position of the end point of the measuring range, and the reading of the pointer meter is a scale value corresponding to the full measuring range.
Step 2024: and if the first position relation and the second position relation represent that the distance between the simulated pointer and the measuring range starting point is less than the distance between the simulated pointer and the measuring range end point, determining the reading of the first pointer meter based on the sum of the first arc line and the arc line.
In practice, if the first and second positional relationships indicate that the simulated pointer is less than the simulated pointer from the beginning of the range than the end of the range, i.e., when the intersection of the simulated pointer in step 2023 is closer to the first connecting line, it indicates that the simulated pointer has traveled less than half the range from the beginning of the range, in which case the first pointer reading is calculated using the first arc formed by the intersection of the simulated pointer and the beginning of the range.
For example, the center of the simulation circle has a coordinate Pc＝(xc,yc) The coordinate of the starting point of the measuring range is P1＝(x1,y1) The coordinate of the end point of the measuring range is P2＝(x2,y2) The first connecting line is
The second connecting line is
The first arc is l1The second arc is l2The sum of the arcs is l1+l2。
After the distance between the analog pointer and the measuring range starting point is determined to be less than the distance between the analog pointer and the measuring range end point, the distance is determined based on the first arc line l1And arc and l1+l2Determining the first pointer meter reading as
Step 2025: and if the first position relation and the second position relation represent that the distance between the simulated pointer and the measuring range starting point is larger than the distance between the simulated pointer and the measuring range ending point, determining the reading of the first pointer meter based on the sum of the second arc line and the arc line.
In practice, if the first and second positional relationships indicate that the analog pointer is farther from the start of the range than the analog pointer is from the end of the range, i.e., when the intersection of the analog pointer in step 2023 is closer to the second connecting line, it indicates that the range traveled by the analog pointer from the start of the range has been halved, in which case the second arc formed by the intersection of the analog pointer and the start of the range is used to calculate the first pointer reading.
The above example is still explained, i.e. the coordinate of the simulation center is Pc＝(xc,yc) The coordinate of the starting point of the measuring range is P1＝(x1,y1) The coordinate of the end point of the measuring range is P2＝(x2,y2) The first connecting line is
The second connecting line is
The first arc is l1The second arc is l2The sum of the arcs is l1+l2。
After the distance between the analog pointer and the measuring range starting point is determined to be larger than the distance between the analog pointer and the measuring range end point, the distance is determined to be based on a second arc line l2And arc and l1+l2Determining the first pointer meter reading as
After describing the above-described scheme of using arc length to obtain the reading of the pointer table, another scheme for determining the reading of the second pointer table based on the included angle is described below.
Step 203: and determining the reading of the second pointer meter based on the included angles between the simulation circle center of the simulation pointer meter and the connecting lines among the simulation pointer, the measuring range starting point and the measuring range ending point.
It should be noted that the effect of the width of each link on the angle formed is ignored in determining the second pointer reading.
As shown in fig. 5, the method specifically includes:
step 2031: respectively calculating a first included angle between the first line segment and the second line segment, a second included angle between the first line segment and the third line segment, and a third included angle between the second line segment and the third line segment; the first line segment is the line segment between the simulation circle center of the simulation pointer meter and the intersection point of the simulation pointer, the second line segment is the line segment between the simulation circle center of the simulation pointer meter and the measuring range starting point, and the third line segment is the line segment between the simulation circle center of the simulation pointer meter and the measuring range end point.
In the implementation process, a first line segment, a second line segment and a third line segment are determined, specifically, the simulation circle center of the simulation pointer table and the intersection point of the simulation pointer are connected to obtain a first line segment; connecting the simulation circle center of the simulation pointer meter with the intersection point of the range starting point to obtain a second line segment; and connecting the simulation circle center of the simulation pointer meter with the intersection point of the measuring range end point to obtain a third line segment.
Then, calculating the size of an included angle between the first line segment and the second line segment to obtain a first included angle; calculating the size of an included angle between the first line segment and the third line segment to obtain a second included angle; and calculating the size of an included angle between the second line segment and the third line segment to obtain a third included angle.
Step 2032: and if the first included angle is larger than or equal to the second included angle, determining the reading of the second pointer meter based on the second included angle, the third included angle, the error offset corresponding to the first included angle and the error offset corresponding to the second included angle.
In order to determine whether the range of the analog pointer meter passed over the analog range is over half, the magnitude of the first included angle and the magnitude of the second included angle can be compared to determine the range. In the implementation process, if the first included angle is greater than or equal to the second included angle, it indicates that the analog pointer meter is closer to the starting point of the measurement range of the analog measurement range, and in this case, the reading of the second pointer meter is determined based on the second included angle, the third included angle, the error offset corresponding to the first included angle, and the error offset corresponding to the second included angle.
It should be noted that, in the above steps 2032 and 2033, the error offset amount corresponding to the first angle represents the angle offset amount corresponding to the position difference between the analog pointer and the adjusted analog pointer on the analog measurement range, and the error offset amount corresponding to the second angle represents the angle offset amount corresponding to the analog measurement range.
For example, the center of the simulation circle has a coordinate Pc＝(xc,yc) The coordinate of the starting point of the measuring range is P1＝(x1,y1) The coordinate of the end point of the measuring range is P2＝(x2,y2) The coordinate of the intersection point of the analog pointer is Pt＝(xt,yt) The length of the first line segment is lc-1The length of the second line segment is lc-2The length of the third line segment is lc-t. Calculating the first included angle theta according to the cosine law1-c-tCalculatingThe second included angle is theta2-c-tCalculating the third angle as theta1-c-2. The error offset corresponding to the first angle is bias _ s, and the error offset corresponding to the second angle is bias _ m.
Calculating a second pointer reading of
Step 2033: and if the first included angle is smaller than or equal to the second included angle, determining the reading of the second pointer meter based on the first included angle, the third included angle, the error offset corresponding to the first included angle and the error offset corresponding to the second included angle.
In the implementation process, if the first included angle is smaller than or equal to the second included angle, it indicates that the analog pointer meter is closer to the end point of the measurement range of the analog measurement range, and in this case, the reading of the second pointer meter is determined based on the first included angle, the third included angle, the error offset corresponding to the first included angle, and the error offset corresponding to the second included angle.
It should be noted that, in the above steps 2032 and 2033, the error offset amount corresponding to the first angle represents the angle offset amount corresponding to the position difference between the analog pointer and the adjusted analog pointer on the analog measurement range, and the error offset amount corresponding to the second angle represents the angle offset amount corresponding to the analog measurement range.
For example, the center of the simulation circle has a coordinate Pc＝(xc,yc) The coordinate of the starting point of the measuring range is P1＝(x1,y1) The coordinate of the end point of the measuring range is P2＝(x2,y2) The coordinate of the intersection point of the analog pointer is Pt＝(xt,yt) The length of the first line segment is lc-1The length of the second line segment is lc-2The length of the third line segment is lc-t. Calculating the first included angle theta according to the cosine law1-c-tCalculating the second angle as theta2-c-tCalculating the third angle as theta1-c-2. The error offset corresponding to the first angle is bias _ s, and the error offset corresponding to the second angle is bias _ sThe amount of shift is bias _ m.
Calculating a second pointer reading of
Step 204: based on the first pointer meter reading and the second pointer meter reading, a target reading of the pointer meter is determined.
In implementation, the average of the first pointer meter reading and the second pointer meter reading is determined as the target reading of the pointer meter. The reading of the pointer meter calculated by adopting the mean value of the first pointer meter reading and the second pointer meter reading is more accurate than the reading of the pointer meter calculated by only the arc length or only the included angle.
Based on the same inventive concept, referring to fig. 6, an embodiment of the present disclosure provides a pointer meter reading identification device, including:
the identification unit 601 is used for identifying an image containing the pointer meter to obtain an analog range and an analog pointer, and fitting the analog range and the analog pointer to obtain the analog pointer meter, wherein the analog range is an arc line used for representing a range starting point, a range end point and a range length of the pointer meter, and the analog pointer is used for representing the pointing direction of a pointer head of the pointer meter on the analog range;
a first reading unit 602, configured to obtain an intersection point between the analog pointer and the analog measurement range, and determine a reading of the first pointer table based on an arc length formed on the analog pointer table by the intersection point and the measurement range starting point;
the second reading unit 603 is configured to determine a reading of the second pointer table based on an included angle between a simulation center of the simulation pointer table and a connection line between the simulation pointer, the measurement range starting point, and the measurement range ending point;
a reading determination unit 604, configured to determine a target reading of the pointer table based on the first pointer table reading and the second pointer table reading.
Optionally, the image including the pointer table is identified to obtain the analog range and the analog pointer, and the identifying unit 601 is configured to:
identifying the image containing the pointer table through a semantic segmentation model to obtain an analog range; and
and identifying the image containing the pointer table through the pointer target detection model to obtain the simulated pointer.
Optionally, before identifying the image containing the pointer table and obtaining the analog measurement range and the analog pointer, the method further includes:
and acquiring an instrument image acquired by front-end equipment, carrying out target detection on the instrument image through a pointer table target detection model, and intercepting an image containing a pointer table based on a target detection result.
Optionally, the analog range and the analog pointer are fitted to obtain an analog pointer table, and the identifying unit 601 is configured to:
carrying out graphic and graphic operations on the analog range and the analog pointer respectively to obtain the analog range and the analog pointer after noise points are removed;
connecting the simulation circle center and the intersection point to obtain an adjusted simulation pointer;
detecting the simulation measuring range by using the Thomas angular point to obtain a measuring range starting point, a measuring range end point and a measuring range length;
and fitting the analog range, the adjusted analog pointer, the range starting point, the range end point and the range length by using cumulative probability Hough transform to obtain the analog pointer meter.
Optionally, an intersection of the analog pointer and the analog range is obtained, and a first pointer reading is determined based on an arc length formed on the analog pointer by the intersection and the range starting point, and the first reading unit 602 is configured to:
determining a first connecting line based on the simulation circle center and the range starting point, and determining a second connecting line based on the simulation circle center and the range end point;
determining a first arc line of the intersection point of the simulation pointer and the starting point of the measuring range on the measuring range length, determining a second arc line of the intersection point of the simulation pointer and the ending point of the measuring range on the measuring range length, and calculating the arc sum of the first arc line and the second arc line;
respectively determining a first position relation between the intersection point of the simulation pointer and the first connecting line and a second position relation between the intersection point of the simulation pointer and the second connecting line;
if the first position relation and the second position relation represent that the distance between the simulated pointer and the measuring range starting point is smaller than the distance between the simulated pointer and the measuring range end point, determining the reading of the first pointer meter based on the sum of the first arc line and the arc line;
and if the first position relation and the second position relation represent that the distance between the simulated pointer and the measuring range starting point is larger than the distance between the simulated pointer and the measuring range ending point, determining the reading of the first pointer meter based on the sum of the second arc line and the arc line.
Optionally, based on included angles between the simulation center of the simulation pointer meter and connection lines between the simulation pointer, the measurement range starting point, and the measurement range ending point, respectively, a second reading unit 603 is configured to:
respectively calculating a first included angle between the first line segment and the second line segment, a second included angle between the first line segment and the third line segment, and a third included angle between the second line segment and the third line segment; wherein the first line segment is a line segment between the simulation circle center of the simulation pointer meter and the intersection point of the simulation pointer, the second line segment is a line segment between the simulation circle center of the simulation pointer meter and the starting point of the measuring range, and the third line segment is a line segment between the simulation circle center of the simulation pointer meter and the end point of the measuring range;
if the first included angle is larger than or equal to the second included angle, determining the reading of a second pointer meter based on the second included angle, the third included angle, the error offset corresponding to the first included angle and the error offset corresponding to the second included angle;
if the first included angle is smaller than or equal to the second included angle, determining the reading of a second pointer meter based on the first included angle, the third included angle, the error offset corresponding to the first included angle and the error offset corresponding to the second included angle;
the error offset corresponding to the first included angle represents the angle offset corresponding to the position difference between the analog pointer and the adjusted analog pointer on the analog measuring range, and the error offset corresponding to the second included angle represents the angle offset corresponding to the analog measuring range.
Alternatively, based on the first pointer meter reading and the second pointer meter reading, a target reading of the pointer meter is determined, and the reading determination unit 604 is configured to:
and determining the average value of the first pointer meter reading and the second pointer meter reading as the target reading of the pointer meter.
Based on the same inventive concept, referring to fig. 7, an embodiment of the present disclosure provides a computing device, including: a memory 702 for storing executable instructions; a processor 701 configured to read and execute the executable instructions stored in the memory 702, and perform any one of the methods of the first aspect.
Based on the same inventive concept, the disclosed embodiments provide a computer-readable storage medium, wherein instructions that, when executed by a processor, enable the processor to perform the method of any of the above first aspects.
In summary, in the embodiments of the present disclosure, a method, an apparatus, and a storage medium for identifying reading of a pointer meter are provided, where the method for identifying reading of a pointer meter includes: identifying an image containing a pointer meter to obtain an analog range and an analog pointer, fitting the analog range and the analog pointer to obtain an analog pointer meter, wherein the analog range is an arc line used for representing a range starting point, a range end point and a range length of the pointer meter, the analog pointer is used for representing the direction of a pointer head of the pointer meter on the analog range, an intersection point of the analog pointer and the analog range is obtained, a first pointer meter reading is determined based on an arc length formed on the analog pointer meter by the intersection point and the range starting point, a second pointer meter reading is determined based on an included angle formed by a simulation circle center of the analog pointer meter and a connecting line between the analog pointer, the range starting point and the range end point respectively, a target pointer reading of the pointer meter is determined based on the first pointer meter reading and the second pointer meter reading, and a mode of determining the pointer meter reading according to the arc length and the included angle is adopted in the meter reading identification process respectively, and the average value of the two modes is used as the final target reading of the pointer table, so that the accuracy and the reliability of the pointer table in the reading identification process are guaranteed.
As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product system. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product system 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 disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program product systems according to the present disclosure. 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.
It will be apparent to those skilled in the art that various changes and modifications can be made in the present disclosure without departing from the spirit and scope of the disclosure. Thus, if such modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include such modifications and variations as well.
Claims (10)
1. A pointer meter reading identification method is applied to a computing device and comprises the following steps:
identifying an image containing a pointer meter to obtain an analog range and an analog pointer, and fitting the analog range and the analog pointer to obtain the analog pointer meter, wherein the analog range is an arc line used for representing a range starting point, a range end point and a range length of the pointer meter, and the analog pointer is used for representing the pointing direction of a pointer head of the pointer meter on the analog range;
acquiring an intersection point of the analog pointer and the analog measuring range, and determining a first pointer meter reading based on an arc length formed on the analog pointer meter by the intersection point and the measuring range starting point;
determining the reading of a second pointer meter based on the included angles between the simulation circle center of the simulation pointer meter and the connecting lines among the simulation pointer, the measuring range starting point and the measuring range end point respectively;
and determining a target reading of the pointer table based on the first pointer table reading and the second pointer table reading.
2. The method of claim 1, wherein the identifying the image containing the pointer table to obtain the analog range and the analog pointer comprises:
identifying the image containing the pointer table through a semantic segmentation model to obtain an analog range; and
and identifying the image containing the pointer table through the pointer target detection model to obtain the simulated pointer.
3. The method of claim 1, wherein before identifying the image containing the pointer table to obtain the analog range and the analog pointer, further comprising:
acquiring an instrument image acquired by front-end equipment, carrying out target detection on the instrument image through a pointer table target detection model, and intercepting the image containing a pointer table based on a target detection result.
4. The method of claim 1, wherein fitting the simulated range to the simulated pointer to obtain a table of simulated pointers comprises:
carrying out graphic and graphic operation on the simulation range and the simulation pointer respectively to obtain the simulation range and the simulation pointer after noise points are removed;
connecting the simulation circle center and the intersection point to obtain the adjusted simulation pointer;
detecting the simulation measuring range by using the Thomas angular point to obtain the measuring range starting point, the measuring range terminal point and the measuring range length;
and fitting the simulation range, the adjusted simulation pointer, the range starting point, the range end point and the range length by using cumulative probability Hough transform to obtain the simulation pointer meter.
5. The method of claim 4, wherein obtaining an intersection of the analog pointer and the analog range, and determining the first pointer reading based on an arc length formed on the analog pointer by the intersection and the range start point comprises:
determining a first connecting line based on the simulation circle center and the range starting point, and determining a second connecting line based on the simulation circle center and the range end point;
determining a first arc of the intersection of the simulated pointer and the range start over the range length, and determining a second arc of the intersection of the simulated pointer and the range end over the range length, and calculating a sum of the arcs of the first arc and the second arc;
respectively determining a first position relation between the intersection point of the simulation pointer and the first connecting line and a second position relation between the intersection point of the simulation pointer and the second connecting line;
if the first and second positional relationships indicate that the simulated pointer is less than the simulated pointer;
and if the first position relation and the second position relation indicate that the distance between the simulated pointer and the measuring range starting point is larger than the distance between the simulated pointer and the measuring range ending point, determining the reading of the first pointer meter based on the sum of the second arc line and the arc line.
6. The method of claim 1, wherein determining a second pointer meter reading based on angles between simulated centers of the simulated pointers of the simulated pointer meters and respective connecting lines between the simulated pointer, the range start point, and the range end point comprises:
respectively calculating a first included angle between a first line segment and a second line segment, a second included angle between the first line segment and a third line segment, and a third included angle between the second line segment and the third line segment; wherein the first line segment is a line segment between an analog center of circle of the analog pointer meter and the intersection of the analog pointer, the second line segment is a line segment between an analog center of circle of the analog pointer meter and the range starting point, and the third line segment is a line segment between an analog center of circle of the analog pointer meter and the range ending point;
if the first included angle is larger than or equal to a second included angle, determining the reading of the second pointer table based on the second included angle, the third included angle, the error offset corresponding to the first included angle and the error offset corresponding to the second included angle;
if the first included angle is smaller than or equal to a second included angle, determining the reading of the second pointer table based on the first included angle, the third included angle, the error offset corresponding to the first included angle and the error offset corresponding to the second included angle;
the error offset corresponding to the first included angle represents an angle offset corresponding to the position difference between the analog pointer and the adjusted analog pointer on the analog measuring range, and the error offset corresponding to the second included angle represents an angle offset corresponding to the analog measuring range.
7. A method as any one of claims 1-6 recites, wherein determining a target reading of a pointer table based on the first pointer table reading and the second pointer table reading comprises:
determining the average value of the first pointer meter reading and the second pointer meter reading as the target reading of the pointer meter.
8. An apparatus for identifying reading of a pointer meter, comprising:
the device comprises an identification unit, a display unit and a control unit, wherein the identification unit is used for identifying an image containing a pointer meter to obtain an analog range and an analog pointer, and fitting the analog range and the analog pointer to obtain the analog pointer meter, wherein the analog range is an arc line used for representing a range starting point, a range end point and a range length of the pointer meter, and the analog pointer is used for representing the pointing direction of a pointer head of the pointer meter on the analog range;
the first reading unit is used for acquiring an intersection point of the analog pointer and the analog range and determining the reading of the first pointer meter based on the arc length formed on the analog pointer meter by the intersection point and the range starting point;
the second reading unit is used for determining the reading of the second pointer meter based on the included angles between the simulation circle center of the simulation pointer meter and the connecting lines among the simulation pointer, the measuring range starting point and the measuring range terminal point;
and the reading determining unit is used for determining the target reading of the pointer table based on the first pointer table reading and the second pointer table reading.
9. A computing device, comprising:
a memory for storing executable instructions;
a processor for reading and executing executable instructions stored in the memory to implement the method of any one of claims 1-7.
10. A computer-readable storage medium, wherein instructions in the storage medium, when executed by a processor, enable the processor to perform the method of any of claims 1-7.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115019028A (en) * | 2022-08-02 | 2022-09-06 | 北京中拓新源科技有限公司 | Intelligent identification method and device for reading of polymorphic pointer meter |
| CN116704510A (en) * | 2023-08-08 | 2023-09-05 | 深圳中集智能科技有限公司 | Intelligent identification method for machine vision industrial instrument data |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115019028A (en) * | 2022-08-02 | 2022-09-06 | 北京中拓新源科技有限公司 | Intelligent identification method and device for reading of polymorphic pointer meter |
| CN116704510A (en) * | 2023-08-08 | 2023-09-05 | 深圳中集智能科技有限公司 | Intelligent identification method for machine vision industrial instrument data |
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