Device, method, and program for determining service wire diameter type

Abstract

To provide a device, method, and program capable of easily determining a service wire diameter type from an image.SOLUTION: A determination device 100 includes an acquisition unit 151 that acquires an image showing a grip supporting the subject service wire on a utility pole, an image processing unit 152 that estimates the length of a grip portion of the grip by performing image processing on the acquired image, and a determination unit 154 that determines the diameter type of the subject service wire on the basis of the estimated length of the grip portion.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a device, a method, and a program for determining the diameter type of a drop wire. [Background technology]

[0002] In response to increases or decreases in contract capacity or grid interconnection, work may be required to check the status of service lines connected to distribution lines. This check requires a person in charge to be dispatched to the site to check visually or to request an electrical construction company to check on-site, which requires a lot of time and effort. One possible solution to this problem is to use images of service lines. For example, Patent Document 1 discloses a system that uses images of service lines and extracts service lines from images taken by an unmanned aerial vehicle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-99226 Summary of the Invention [Problem to be solved by the invention]

[0004] The system in Patent Document 1 simply compares an image of the extracted service line with reference information showing the shape of a regular service line to determine whether the extracted service line is properly installed, but has the problem of not being able to determine the diameter type of the extracted service line.In order to increase or decrease contract capacity or connect to the grid, it is necessary to know the diameter type of the service line in advance to prevent the service line from melting due to insufficient thermal capacity or from exceeding the allowable voltage drop value in the service line.Therefore, there is a demand for the development of a method for determining the diameter type of a service line on a desk.

[0005] The present invention has been made in light of the above background, and aims to provide a determination device, a determination method, and a program that can easily determine the diameter type of a drop wire from an image. [Means for solving the problem]

[0006] In order to achieve the above object, a determination device according to the present invention comprises: an acquisition unit that acquires an image of a grip that supports the target drop line on the utility pole; an image processing unit that performs image processing on the acquired image to estimate the length of the grip portion of the grip; a determination unit that determines a diameter type of the drop wire to be determined based on the estimated length of the grip portion; Equipped with. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a determination device, a determination method, and a program that can easily determine the diameter type of a drop wire from an image. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic diagram showing a drop line fastened to a utility pole and connected to the indoor wiring of a building. [Figure 2] 10A and 10B are diagrams showing the configuration of a grip for fastening a drop wire to a utility pole. [Figure 3] 1 is a block diagram showing a hardware configuration of a determination device according to an embodiment of the present invention; [Figure 4] (a) is a diagram showing an example of a data table of the grip data storage unit, (b) is a diagram showing an example of a data table of the minimum diameter type data storage unit, and (c) is a diagram showing an example of a data table of the judgment target data storage unit. [Figure 5] FIG. 4 is a diagram showing an example of an input form displayed on a display of the determination device according to the embodiment of the present invention. [Figure 6] 10A and 10B are diagrams showing examples of captured images depicting the hook length and grip length displayed on the display unit of the determination device according to the embodiment of the present invention. [Figure 7]FIG. 10 is a diagram showing an example of a determination result screen displayed on a display of the determination device according to the embodiment of the present invention. [Figure 8] 10 is a flowchart showing the flow of a determination process according to an embodiment of the present invention. [Figure 9] 3 is a flowchart showing the flow of image processing according to the embodiment of the present invention. [Figure 10] 10 is a flowchart showing the flow of a comparison process according to an embodiment of the present invention. [Figure 11] FIG. 10 is a diagram showing an example of a captured image depicting the hook length and grip length displayed by the display unit of the determination device according to the modified example of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a determination device, a determination method, and a program according to the present invention will be described in detail with reference to the drawings. In each drawing, the same or equivalent parts are designated by the same reference numerals.

[0010] As shown in Figure 1, the determination device according to the embodiment determines the diameter type of a drop wire held to a utility pole by a grip based on an image of the grip that holds the drop wire to the utility pole. Specifically, image processing is performed on the image of the grip that holds the drop wire to estimate the grip dimensions, and the diameter type of the drop wire is identified based on the estimated grip dimensions. The reason why the diameter type of the drop wire can be identified based on the estimated grip dimensions is because the grip dimensions differ for each diameter type of drop wire. This allows the drop wire diameter type to be determined without requiring a worker to be dispatched to the site.

[0011] A drop wire is an electric wire that connects a distribution line installed on a utility pole with the indoor wiring of a building. The drop wire is connected to the distribution line with a power storage connector and is secured to the utility pole with a pole mounting fixture. Drop wire diameters are classified by the thickness of the drop wire, and the thickness of the insulation coating also varies depending on the diameter of the internal conductor (copper wire). Different diameter types of drop wire have different heat tolerances and voltage drop tolerances, so the appropriate diameter type of drop wire must be selected depending on the current that the equipment inside the building will receive.

[0012] For example, polyvinyl chloride insulated drop service wires (DV) are widely used as drop wires. There are two different types of DV, for example, DV and DV-L. DV-L has newer specifications than DV, and has color-coded lines in the sheath, making it easy to distinguish between the two by appearance.

[0013] The pole attachment device for securing the drop wire to the utility pole is composed of, for example, a band, a strap, and a grip. The band is an annular part that is attached to the utility pole by tightening it around the pole with a fastening fixture. The band is, for example, a stainless steel band. The strap is a fixture that is supported by the band and has a through hole through which the grip is attached.

[0014] As shown in Figure 2, the grip comprises a grip portion and a hook portion connected to the grip portion. The hook portion is a metal piece that is attached to the through hole of the strap. The length of the hook portion is standardized to a fixed length (e.g., 210 mm) regardless of the type of grip. The grip portion is a component that supports the drop wire while it is wound around it, and is made by forming a portion of a wire that is insulated with vinyl chloride or the like into a corrugated shape and then bending it into a U-shape. Each of these corrugated irregularities is a grip cone, and there are seven grip cones in Figure 2. The grips differ from each other in at least one of the following: grip type, thickness, dimensions of the grip portion and hook portion, number of grip cones, and grip cap color.

[0015] Grip caps are attached to the two ends of the grip to protect the core wires at the ends of the grip. Grip caps are made of, for example, polyvinyl chloride and are color-coded to identify the diameter of the drop wire. Grip cap colors include, for example, black, gray, and red. Grip types have been improved over time and are now classified into three types: general use, strong wind use, and current type. The above is the configuration of the drop line and pole mounting device.

[0016] Next, a hardware configuration of a determination device 100 according to an embodiment will be described with reference to Fig. 3. The determination device 100 includes an operation unit 110, a display unit 120, a communication unit 130, a storage unit 140, and a control unit 150. The units of the determination device 100 are connected to each other via an internal bus (not shown).

[0017] The operation unit 110 receives instructions from the user and supplies operation signals corresponding to the received operations to the control unit 150. The operation unit 110 includes, for example, a mouse and a keyboard. The display unit 120 displays various images to the user based on image data supplied from the control unit 150.

[0018] The communication unit 130 is a communication interface that enables the determination device 100 to communicate with external devices. The communication unit 130 communicates with external devices via a communication network such as the Internet. The communication unit 130 receives image data from, for example, a smartphone or an external server.

[0019] The storage unit 140 includes, for example, a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, and a hard disk. The storage unit 140 stores programs executed by the control unit 150 and various data. The storage unit 140 also temporarily stores various types of information and functions as a work memory for the control unit 150 to execute processes. The storage unit 140 stores, for example, an allowable current value and a voltage drop upper limit value of the drop line. The allowable current value of the drop line is the maximum current value that is allowed to flow through the drop line at all times. The voltage drop upper limit value is the upper limit value of the difference (voltage drop value) in voltage that drops due to current flowing through the drop line, and is set to, for example, 2.0 V.

[0020] Furthermore, the storage unit 140 includes a grip data storage unit 141, a minimum diameter type data storage unit 142, and a determination target data storage unit 143. As shown in FIG. 4(a), the grip data storage unit 141 stores in advance data (grip data) that defines the dimensions and shape of the grip for each grip type. The grip data includes, for example, grip length, hook length, number of grip windings, and grip cap color. The grip length is the length of the grip portion, and the hook length is the length of the hook portion. The grip data storage unit 141 also stores data on the drop wire diameter type and DV type corresponding to the grip type, as well as a score calculated based on the grip dimensions. The score is a parameter that plays an important role in determining the drop wire diameter type, and the calculation procedure will be described later.

[0021] 4(b), the minimum diameter type data storage unit 142 varies the contract capacity and the length of the service line of the customer who has pulled in the service line to be evaluated at regular intervals, and stores the minimum diameter type that the service line must satisfy, calculated under each condition, for each DV type. The minimum diameter type that the service line must satisfy is calculated in advance using the following procedure and stored in the minimum diameter type data storage unit 142.

[0022] First, the minimum diameter type is calculated so that the current value flowing through one drop wire is equal to or less than the allowable current value for the drop wire stored in memory unit 140. Because the current value flowing through one drop wire can be calculated based on the drop wire's diameter type and contracted capacity, the minimum diameter type can be calculated using the allowable current value as a threshold. Next, the minimum diameter type is calculated so that the voltage drop value calculated based on the contracted capacity and drop wire length is equal to or less than the voltage drop upper limit value stored in memory unit 140. Because the voltage drop value can be calculated based on the drop wire's diameter type, contracted capacity, and drop wire length, the minimum diameter type can be calculated using the voltage drop upper limit value as a threshold. Next, the larger of the two calculated minimum diameter types is determined as the minimum diameter type that the drop wire must satisfy.

[0023] As shown in FIG. 4(c), the determination target data storage unit 143 stores data (determination target data) related to the service line to be determined and the grip connected to the service line in association with a service line ID (Identification). The service line ID is an example of identification information individually assigned to the service line to be determined. The determination target data includes, for example, information on the contract capacity, service line length, grip length, hook length, number of grip windings, DV type, and grip cap color. The contract capacity and service line length may be obtained from the distribution utility's database, and the grip length, hook length, and number of grip windings may be obtained by image processing, which will be described later. The DV type and grip cap color may be determined visually from the captured image.

[0024] Returning to Fig. 3, the control unit 150 includes a processor and controls each unit of the determination device 100. The processor is, for example, a CPU (Central Processing Unit). The control unit 150 executes a program stored in the storage unit 140 to perform the determination process of Fig. 8, the image processing of Fig. 9, and the comparison process of Fig. 10. Functionally, the control unit 150 includes an acquisition unit 151, an image processing unit 152, a calculation unit 153, a determination unit 154, a narrowing down unit 155, and an output unit 156.

[0025] The acquisition unit 151 acquires an image of the grip supporting the drop wire. Specifically, the acquisition unit 151 acquires the image of the grip supporting the drop wire and displays it on the display unit 120, and also generates a captured image by capturing a part of the captured image displayed on the display unit 120 within a capture range set by the user.

[0026] The captured image is, for example, an image taken by a worker on-site using a smartphone, or an image acquired using an internet map service or a mobile mapping system (MMS). The capture range set for the captured image is selected so as to include the entire grip supporting the drop line. The capture range can be selected by displaying the captured image on the display unit 120 and operating the operation unit 110 while the program is running.

[0027] The acquisition unit 151 acquires the data to be determined and stores it in the data to be determined storage unit 143 in association with the drop line ID of the drop line to be determined. The user operates the operation unit 110 to input the data to be determined into an input form displayed on the display unit 120. An example of the input form is shown in FIG. 5. The grip cap color can be selected from black, gray, and red. The default DV type is DV, and DV-L can be selected as needed. Note that data acquisition by the acquisition unit 151 includes not only acquiring data from an external device, but also reading data stored in the storage unit 140 into memory.

[0028] Returning to FIG. 3, the image processing unit 152 estimates the grip length by performing image processing on the captured image, thereby assisting the user in counting the grip windings. Specifically, the user first operates the operation unit 110 to draw a first measurement line on the captured image displayed on the display unit 120 so that it overlaps with the hook portion of the grip, as shown in FIGS. 6(a) and 6(b). When the operation unit 110 accepts the operation to draw the first measurement line, the image processing unit 152 calculates a conversion ratio between the length of the first measurement line and the actual hook length. Because the actual hook length is constant regardless of the grip specifications, if a conversion ratio between the length of the first measurement line and the actual hook length is calculated, the grip length can be calculated based on this conversion ratio.

[0029] Next, the user draws a second measurement line on the captured image so that it overlaps with the grip portion of the grip, as shown in Figures 6(a) and 6(b). When the operation unit 110 accepts the operation to draw the second measurement line, the image processing unit 152 calculates the grip length based on the length of the second measurement line and the conversion ratio. Using the above procedure, the grip length can be estimated even if the resolution and magnification of the captured image are unknown.

[0030] Next, when the operation unit 110 receives a user instruction, the image processing unit 152 binarizes at least the portion of the captured image in which the grip portion is depicted, and the user counts the grip windings based on the binarized image. Because the captured image is binarized, the grip windings are clearly depicted on the display unit 120, allowing the user to easily count the number of grip windings.

[0031] The calculation unit 153 calculates a score indicating a weighted average based on the hook length stored in the grip data storage unit 141, the grip length estimated by the image processing unit 152, and the number of grip turns counted by the user. The calculation unit 153 stores the calculated score in the determination target data storage unit 143 in association with the drop line ID corresponding to the drop line to be determined.

[0032] In the calculation of the weighted average by the calculation unit 153, three parameters, each having a different unit, are directly multiplied by a weight and then divided by the total value of the weights to calculate a score indicating the weighted average. Specifically, if the grip length, hook length, and number of grip turns are L1, L2, and N, respectively, and the weights multiplied by each parameter are w1, w2, and w3, the score S indicating the weighted average is expressed by the following formula (1). S=(w1×L1+w2×L2+w3×N) / (w1+w2+w3)…(1)

[0033] Here, the weights w1, w2, and w3 are set by adjusting the weights so that the difference in score S for each grip type is large, then creating a normal distribution of sample data for score S, and adjusting the weights so that the difference between the score S calculated based on the sample image and the median of the normal distribution of the sample data is as small as possible. For example, the weights are set as w1 = 2, w2 = 1, and w3 = 300.

[0034] The determination unit 154 compares the diameter type of the drop line determined based on the score calculated by the calculation unit 153 with the minimum diameter type of the drop line determined based on the minimum diameter type data stored in the minimum diameter type data storage unit 142, thereby finally determining the diameter type of the drop line to be determined.

[0035] Specifically, first, the determination unit 154 performs a weighted average determination based on the scores calculated by the calculation unit 153. In the weighted average determination, the score calculated by the calculation unit 153 is compared with the scores for each grip type stored in the grip data storage unit 141, and the score for each grip type stored in the grip data storage unit 141 that is closest to the score calculated by the calculation unit 153 is determined to be the grip type that supports the drop wire being determined. Next, the grip data storage unit 141 is referenced to read out the drop wire diameter type that corresponds to the determined grip type. In this determination process, the differences between the scores calculated by the calculation unit 153 and the scores for each grip type stored in the grip data storage unit 141 are comprehensively calculated, and the grip type with the smallest difference is determined to be the grip type that supports the drop wire being determined.

[0036] Next, the determination unit 154 performs a voltage drop determination based on the contract capacity and the drop line length acquired by the acquisition unit 151. In the voltage drop determination, the determination unit 154 references the minimum diameter type data storage unit 142 and reads out the minimum diameter type that the drop line to be determined must satisfy, based on the contract capacity and the drop line length acquired by the acquisition unit 151.

[0037] Next, the determination unit 154 compares the weighted average determination result with the voltage drop determination result, and if the minimum diameter type determined by the voltage drop determination is greater than the diameter type determined by the weighted average determination, the minimum diameter type determined by the voltage drop determination is used as the final determination instead of the diameter type determined by the weighted average determination. The reason for prioritizing the voltage drop determination result when the minimum diameter type determined by the voltage drop determination is greater than the diameter type determined by the weighted average determination is that in such a case, the voltage and current flowing through the service line may exceed the specified values.

[0038] The narrowing down unit 155 narrows down candidates for grip types that are estimated to be grips supporting the drop line to be determined, based on the grip cap color and DV type acquired by the acquisition unit 151. Specifically, since the grip data storage unit 141 stores the correspondence between the grip cap color and DV type and the grip type, it is possible to narrow down candidates for grip types based on the input grip cap color and DV type.

[0039] The output unit 156 outputs to the outside the photographed image and the captured image acquired by the acquisition unit 151, the calculation result by the calculation unit 153, the determination result by the determination unit 154, and the narrowing-down result by the narrowing-down unit 155. For example, the output unit 156 displays the photographed image and the captured image acquired by the acquisition unit 151 on the display unit 120. Furthermore, when the user draws a first measurement line on the captured image so that it overlaps with the hook portion of the grip, the output unit 156 reads the hook length stored in advance in the memory unit 140, and displays the hook length value (210 mm) near the first measurement line on the display unit 120 as shown in the captured images in FIGS. 6(a) and 6(b). In addition, when the user draws a second measurement line on the captured image so that it overlaps with the grip portion of the grip, the output unit 156 causes the display unit 120 to display the calculated grip length value (800 mm in Figure 6(a) and 750 mm in Figure 6(b)) near the second measurement line as shown in the captured images of Figures 6(a) and (b).

[0040] Furthermore, the output unit 156 causes the display unit 120 to display a determination result screen showing the calculation result by the calculation unit 153, the determination result by the determination unit 154, and the narrowing down result by the narrowing down unit 155. An example of the determination result screen is shown in FIG.

[0041] In the data table on the left side of Figure 7, data columns for grip length (grip length), hardware length (hook length), number of grip ridges (grip winding ridges), and score are arranged vertically for each grip type. Data columns other than the "target product" are read from the grip data storage unit 141 and arranged in order according to score. On the other hand, the data columns for the "target product" whose data columns are shaded vary according to the score calculated by the calculation unit 153. In Figure 7, the score for the target product is between "Strong Wind_14" and "Strong Wind_38," so the data column is arranged between the two and is closest to the score for "Strong Wind_14" among grips with a hardware length of 210 mm. Therefore, the grip type is determined to be "Strong Wind_14" in the "Weighted Average Judgment" column in the left data table. The "Judgment: 14" in the left data table and the "14" in the "Weighted Judgment" column in the right area indicate that the judgment result for the drop wire diameter type corresponding to the grip type "Strong Wind_14" is "14." The data also includes grips with metal lengths of 150mm and 180mm, but these grips are older specifications and are no longer in use, so their scores will not be compared with the scores of the target product.

[0042] The upper right area of ​​Fig. 7 shows various parameters entered by the user in the input form of Fig. 5. The results of narrowing down the grip type candidates by the narrowing down unit 155 using the DV type and grip cap color are shown in "Narrowed Down." The right area of ​​Fig. 7 shows the possibility that the grip type is either "14" or "60-2."

[0043] The "single line current," "voltage drop current," and "voltage drop upper limit" displayed in the middle area of ​​Figure 7 are values ​​read from the storage unit 140. "Allowable current determination" displays the minimum diameter type for which the current value flowing through one service line is equal to or less than the service line's allowable current value. "Voltage drop determination" displays the minimum diameter type for which the voltage drop value in the service line is equal to or less than the voltage drop upper limit. "Final determination by calculation" displays the larger diameter type of either the allowable current determination or the voltage drop determination. "Confirmation (index)" displays the crosspoint value in the graph in the lower right area of ​​Figure 7. The graph in Figure 7 is a table of data read from the minimum diameter type data storage unit 142, with the vertical axis representing the contract capacity and the horizontal axis representing the service line length. The crosspoint value is the minimum diameter type determined by the voltage drop determination and indicates the voltage drop determination result. The graph in Figure 7 is color-coded by DV type, so the DV type can also be identified. These calculation results are displayed on the judgment result screen together with the calculation results of the weighted average score to help the user make a final judgment on the diameter type of the drop wire.

[0044] The "calculated judgment" in the right area of ​​Figure 7 displays the same judgment result as the "final judgment by calculation," while the "weighted average judgment" displays the judgment result based on the weighted average score. The "overall judgment" displays the "calculated judgment" if the "calculated judgment" is greater than the "weighted average judgment," and otherwise displays the "weighted average judgment." The above is the hardware configuration of the determination device 100.

[0045] (Determination process) The flow of the determination process executed by the determination device 100 will be described below with reference to the flowchart in Fig. 8. The determination process starts when the user starts an application.

[0046] First, the user launches a browser to access an internet map service or imports an image from a smartphone, and displays a captured image of the service line to be determined on the screen of the display unit 120 of the determination device 100. In this state, when the user launches an application, the captured image is displayed in the application window. At this time, the determination device 100 displays a frame indicating a capture range, which is an area within which a portion of the captured image displayed on the display unit 120 is to be cut out, superimposed on the captured image in the window. The position, size, and shape of the frame can be adjusted by the user operating the operation unit 110.

[0047] The user sets the capture range by operating the operation unit 110 to adjust the frame so that it includes the entire grip supporting the drop line to be determined. When the operation unit 110 accepts the operation to set the capture range, the acquisition unit 151 acquires a capture image capturing the entire grip (step S1).

[0048] Next, the image processing unit 152 performs image processing on the captured image acquired in the process of step S1 to estimate the grip length and performs image processing to support counting of the grip windings (step S2). Hereinafter, the flow of image processing performed by the image processing unit 152 will be described with reference to FIG.

[0049] (Image Processing) First, the user operates the operation unit 110 to draw a first measurement line on the captured image displayed on the display unit 120 so that it overlaps with the hook portion of the grip. When the operation unit 110 receives the user's instruction to draw the first measurement line, the image processing unit 152 measures the length of the drawn first measurement line, reads out the hook length pre-stored in the memory unit 140, and calculates the conversion ratio between the length of the first measurement line and the hook length (step S11). At this time, the output unit 156 displays the hook length value 210 (unit: mm) near the first measurement line, for example, as shown in the captured image in FIG. 6(a).

[0050] Next, the user operates the operation unit 110 to draw a second measurement line on the captured image displayed on the display unit 120 so that it overlaps with the grip portion of the grip. When the operation unit 110 receives the user's instruction to draw the second measurement line, the image processing unit 152 measures the length of the second measurement line and calculates the grip length based on the conversion ratio between the length of the first measurement line and the hook length (step S12). At this time, the output unit 156 displays the calculated grip length value 800 (unit: mm) near the second measurement line, for example, as shown in the captured image in FIG. 6(a).

[0051] Next, the user operates the operation unit 110 to execute a process of binarizing a part or all of the captured image acquired in the process of step S1. When the operation unit 110 accepts the operation, the image processing unit 152 executes binarization of the captured image (step S13) and returns the process. Thereafter, the user can count the grip windings by referring to the binarized image. This completes the image processing flow.

[0052] When the counting of the grip windings is completed, the user displays the input form shown in Fig. 5 on the display unit 120 and inputs the data to be determined. Specifically, the user inputs the values ​​of the contract capacity, drop line length, hook length, grip length, and number of grip windings, and selects the grip cap color and DV type. When the operation unit 110 accepts the operation, the acquisition unit 151 acquires the data to be determined input into the input form and stores it in the determination data storage unit 143 in association with the drop line ID (step S3).

[0053] Next, the calculation unit 153 calculates a score indicating a weighted average based on the hook length, grip length, and number of grip windings obtained in the processing of step S3, and stores the calculated score in the judgment target data storage unit 143 in association with the drop line ID (step S4).

[0054] Next, determination unit 154 executes a comparison process to determine the diameter type of the drop wire to be determined by comparing the determination result of the drop wire diameter type based on the score calculated by calculation unit 153 with the determination result of the drop wire diameter type based on the minimum diameter type data stored in minimum diameter type data storage unit 142 (step S5). Hereinafter, the flow of the comparison process executed by determination unit 154 will be described with reference to Fig. 10.

[0055] (Comparison process) First, the determination unit 154 performs a weighted average determination based on the score calculated in the processing of step S4 (step S21). Specifically, the determination unit 154 compares the score calculated in the processing of step S4 with the scores for each grip type stored in the grip data storage unit 141, and identifies the scores for each grip type stored in the grip data storage unit 141 that are closest to the calculated score as the grip type supporting the drop wire to be determined and the diameter type of the drop wire to be determined.

[0056] Next, the determination unit 154 performs a voltage drop determination based on the contract capacity and the drop line length acquired in the process of step S3 (step S22). Specifically, by referring to the minimum diameter type data storage unit 142, the determination unit 154 reads out the minimum diameter type that the drop line to be determined should satisfy based on the contract capacity and the drop line length acquired by the acquisition unit 151.

[0057] Next, the determination unit 154 compares the weighted average determination result obtained by the processing in step S21 with the voltage drop determination result obtained by the processing in step S22 to finally determine the diameter type of the drop wire being determined (step S23). Specifically, if the smallest diameter type obtained by the voltage drop determination is greater than the diameter type obtained by the weighted average determination, the determination unit 154 determines that the smallest diameter type obtained by the voltage drop determination is the diameter type of the drop wire being determined. On the other hand, if the smallest diameter type obtained by the voltage drop determination is not greater than the diameter type obtained by the weighted average determination, the determination unit 154 determines that the diameter type of the drop wire being determined is the diameter type of the drop wire being determined. The above is the flow of the comparison process.

[0058] Returning to FIG. 8, the narrowing-down unit 155 narrows down candidates for the grip type that is presumed to support the drop wire to be determined, based on the grip cap color and DV type acquired in the process of step S3 (step S6).

[0059] Next, the output unit 156 outputs the determination result obtained by the process of step S5 and the narrowed-down result obtained by the process of step S6 to the outside (step S7). For example, the output unit 156 may cause the display unit 120 to display a determination result screen as shown in Fig. 7. The user may ultimately determine the diameter type of the drop line by taking into consideration the degree of deviation between the overall determination result and the narrowed-down result. The above is the flow of the determination process.

[0060] As described above, the determination device 100 according to the embodiment includes an acquisition unit 151 that acquires an image of a grip that supports a target drop wire on a utility pole, an image processing unit 152 that estimates the length of the grip portion of the grip by performing image processing on the acquired image, and a determination unit 154 that determines the diameter type of the target drop wire based on the number of turns of the grip and the estimated length of the grip portion. This makes it possible to easily determine the diameter type of the drop wire from an image of the grip that supports the target drop wire on a utility pole.

[0061] The present invention is not limited to the above-described embodiment, and the following modifications are possible.

[0062] (Variation) In the above embodiment, the grip length is estimated by performing image processing on the captured image, but the present invention is not limited to this. For example, the grip length may be estimated by performing image processing on the photographed image without capturing it.

[0063] In the above embodiment, the user draws the first and second measurement lines on the captured image so that they overlap with the hook and grip portions of the grip, but the present invention is not limited to this. For example, the image processing unit 152 may use a method such as pattern matching or machine learning to detect the hook and grip portions of the grip on the captured image and measure the lengths of the detected hook and grip on the image.

[0064] In the above embodiment, the hook length is constant, and the conversion ratio is calculated using the hook length stored in memory unit 140 and the measured length of the first measurement line, but the present invention is not limited to this. For example, if it is determined that a hook of a different length (180 mm) than the hook length (210 mm) stored in memory unit 140 is being used because an old-specification hook remains, as shown in Figure 11, the hook length stored in grip data memory unit 141 may be rewritten to the determined length by operating operation unit 110, and the conversion ratio may be calculated using the rewritten hook length and the length of the first measurement line.

[0065] In the above embodiment, the user counts the grip windings by referring to the binarized image, but the present invention is not limited to this. For example, if the grip windings can be counted without binarizing the image, the binarization process may be omitted. Alternatively, the image processing unit 152 may be configured to count the grip windings based on the binarized image using techniques such as pattern matching or machine learning.

[0066] In the above embodiment, the user inputs the hook length and grip length into the input form, but the present invention is not limited to this. For example, the control unit 150 of the determination device 100 may store the hook length and grip length estimated by the image processing unit 152 in the determination target data storage unit 143 as the numerical values ​​of these parameters.

[0067] In the above embodiment, the weighted average score is calculated using the hook length, grip length, and number of grip windings, but the present invention is not limited to this. For example, the weighted average score may be calculated based on the grip length and the number of grip windings. Furthermore, the diameter type of the drop wire corresponding to each grip length may be stored in the memory unit 140, and the diameter type of the drop wire may be determined based on the grip length estimated by image processing. Alternatively, the number of grip windings may be further estimated based on the grip length estimated by image processing, and the diameter type of the drop wire may be determined based on the estimated grip length and number of grip windings.

[0068] In the above embodiment, the minimum diameter type of the drop line to be determined is identified based on the contract capacity and drop line length, and the diameter type of the drop line to be determined is determined based on the weighted average score, but the present invention is not limited to this. For example, the process of identifying the minimum diameter type of the drop line to be determined may be omitted, and the diameter type of the drop line to be determined based on the weighted average score may be used as the final determination result.

[0069] In the above embodiment, the candidate grip types to be judged are narrowed down based on the grip cap color and DV type, but the present invention is not limited to this. The process of narrowing down the candidate grip types may be omitted.

[0070] In the above embodiment, the processes are performed in the order of score calculation, reading of the smallest diameter type, and candidate narrowing, but the present invention is not limited to this. The order of these processes is arbitrary.

[0071] In the above embodiment, various data are stored in the storage unit 140 of the determination device 100, but the present invention is not limited to this. For example, all or part of the various data may be stored in an external computer via a communication network.

[0072] In the above embodiment, the determination device 100 operates based on the program stored in the storage unit 140, but the present invention is not limited to this. For example, the functional configuration realized by the program may be realized by hardware.

[0073] In the above embodiment, the determination device 100 is, for example, a general-purpose computer, but the present invention is not limited to this. For example, the determination device 100 may be realized by a computer provided on the cloud.

[0074] In the above embodiment, the processing performed by the determination device 100 is realized by a device having the above-mentioned physical configuration executing a program stored in the memory unit 140, but the present invention may also be realized as a program or as a storage medium on which the program is recorded.

[0075] In addition, a program for executing the above-mentioned processing operations may be stored and distributed on a non-transitory computer-readable recording medium such as a flexible disk, a CD-ROM (Compact Disk Read-Only Memory), a DVD (Digital Versatile Disk), or an MO (Magneto-Optical Disk), and the program may be installed on a computer to configure an apparatus that executes the above-mentioned processing operations.

[0076] The above-described embodiments are merely examples, and the present invention is not limited to these. Various embodiments are possible within the scope of the invention as set forth in the claims. The components described in the embodiments and modifications can be freely combined. Furthermore, inventions equivalent to the inventions set forth in the claims are also included in the present invention. [Explanation of symbols]

[0077] 100 Judgment device 140 Storage section 150 control section 151 Acquisition Department 152 Image processing section 153 Arithmetic section 154 Judgment section

Claims

1. an acquisition unit that acquires an image of a grip that supports the target drop line on the utility pole; an image processing unit that performs image processing on the acquired image to estimate the length of the grip portion of the grip; a determination unit that determines a diameter type of the drop wire to be determined based on the estimated length of the grip portion; A determination device comprising:

2. the image processing unit calculates a conversion ratio based on the length of the hook portion of the grip on the image and the length of the hook portion, and estimates the length of the grip portion on the image based on the calculated conversion ratio and the length of the grip portion. The determination device according to claim 1 .

3. The evaluation device further includes a calculation unit that calculates a weighted average score based on the length of the hook portion, the length of the grip portion, and the number of turns of the grip, the determination unit determines the diameter type of the drop line to be determined based on the score calculated by the calculation unit. The determination device according to claim 2 .

4. the determination device includes a storage unit that stores in advance weighted average scores calculated for each drop wire diameter type, the determination unit compares the score calculated by the calculation unit with the scores for each drop wire diameter type stored in the memory unit, and determines that the drop wire diameter type stored in the memory unit that has a score closest to the score calculated by the calculation unit is the drop wire diameter type to be determined. The determination device according to claim 3 .

5. The acquisition unit acquires a contract capacity of a customer that has a service line to be determined and a length of the service line to be determined, the determination unit specifies a minimum diameter type that the target drop line must satisfy based on the acquired contract capacity and the length of the drop line, and if the specified minimum diameter type is greater than the drop line diameter type determined based on the score calculated by the calculation unit, sets the diameter type of the target drop line to the specified minimum diameter type. The determination device according to claim 3 or 4.

6. A determination method executed by a determination device, acquiring an image of a grip that supports the drop line to be determined on the utility pole; a step of estimating a length of the grip portion of the grip by performing image processing on the acquired image; determining a diameter type of the drop wire based on the estimated length of the grip portion; A determination method including:

7. Computer, an acquisition means for acquiring an image of a grip supporting the target drop line on the utility pole; an image processing means for estimating the length of the grip portion of the grip by performing image processing on the acquired image; a determination means for determining the diameter type of the drop wire based on the estimated length of the grip portion; A program to function as a

Images