JP2018106522A - Automatic inspection system and automatic inspection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a low power consumption of a wireless network by reducing a size of image data to be transmitted when the image data is transmitted using the wireless network.SOLUTION: An automatic inspection system 1 employs a wireless network 2 including: a wireless child station 13 having an imaging unit 14 that photographs a measuring device 4 which measures a physical quantity of an object to be inspected; and a wireless mother station 11 that wirelessly receives the image data obtained by the imaging unit 14 from the wireless child station 13. The wireless child station 13 comprises: a binarization processing unit for binarizing the image data to generate binarized image data; a size reduction processing unit for cutting out image data of the measured value portion of the measuring device 4 in the binarized image data; and a transmission unit for transmitting the image data of the cut measurement value portion to the wireless mother station 11.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an automatic inspection system and an automatic inspection method.

  Many on-site facilities such as power plants and plants are provided with measuring instruments (for example, needle meters) that measure physical quantities such as the amount of water flowing through piping. These measuring instruments have been used for equipment inspection by human eyes at intervals of several times a day or more. However, in maintenance and inspection work, aging of inspection workers and securing of personnel are becoming issues.

  From such a point of view, an automatic inspection system has been developed in which a display unit of a measuring instrument is imaged by a camera and the image data is transmitted via a wireless network, and the inspection work is automated (for example, patent documents). 1 and 2).

  Patent Document 1 states that “a histogram indicating each pixel value is generated for a pixel constituting a captured image, and a range below a predetermined value and a range above a predetermined value are cut out based on the histogram. A discriminant analysis method is applied to the corrected histogram to identify a binarization threshold value, and the pixel value is binarized by the binarization threshold value to binarize the captured image. To generate a binarized image. "

  Further, in Patent Document 2, “the first image and the second image after the first image are compared, and it is determined whether the difference is greater than or equal to a predetermined value. The image data of the second image is output. "

JP 2006-309405 A JP 2010-176202 A

  By the way, in a wireless network, particularly in a wireless network using a self-supporting power source such as a battery as a power source of a wireless terminal, reduction of power consumption of the network is desired. In order to reduce the power consumption of the network, it is considered that one of the effective methods is to reduce the weight of image data to be transmitted.

  However, although the technique disclosed in Patent Document 1 describes a technique for binarizing an image captured by a camera and generating a binarized image by image analysis, consideration is given to reducing the power consumption of the network. It has not been. Further, in the conventional technique described in Patent Document 2, when the difference is greater than or equal to a predetermined value, image data (second image image data) captured by the camera is transmitted as it is, so that a large amount of data is transmitted. The power consumption of the network is large.

  An object of the present invention is to provide an automatic inspection system and an automatic inspection method capable of reducing the power consumption of a network by reducing the weight of the transmitted image data when transmitting the image data using a wireless network. And

In order to achieve the above object, the automatic inspection system of the present invention provides:
Radio including a wireless slave station having an imaging unit that images a measuring instrument that measures a physical quantity to be inspected, and a wireless master station that receives image data obtained by imaging by the imaging unit from the wireless slave station by wireless communication It is an automatic inspection system using a network.
And the wireless slave station
A binarization processing unit that binarizes image data to generate binarized image data;
Of the binarized image data, a weight reduction processing unit that cuts out image data of the measurement value portion of the measuring instrument,
A wireless transmission unit that transmits image data of a measurement value portion cut out by the weight reduction processing unit to the wireless master station;
It is characterized by providing.

The automatic inspection method of the present invention is
Radio including a wireless slave station having an imaging unit that images a measuring instrument that measures a physical quantity to be inspected, and a wireless master station that receives image data obtained by imaging by the imaging unit from the wireless slave station by wireless communication This is an automatic inspection method using a network.
And in the wireless slave station,
Generate binarized image data by binarizing the image data,
Cut out the image data of the measurement value part of the measuring instrument from the binarized image data,
The extracted image data of the measured value part is transmitted to the wireless master station.

  According to the present invention, when transmitting image data using a wireless network, the power consumption of the network can be reduced by reducing the weight of the transmitted image data.

It is an example of a system configuration diagram showing an outline of a basic configuration of a multi-hop wireless network. It is an example of the block diagram which shows the structure of the principal part of the automatic inspection system which concerns on embodiment of this invention. It is an example of the figure which shows typically the binarized image data which binarized the image data acquired from the imaging part. It is an example of the figure which shows typically the image data which painted black except the process area | region of the image which the user set. It is an example of the figure which shows typically the image data which cut out the process area | region of the image which the user set. It is the example of the figure which shows typically the image data which cut out only the value which the needle has pointed, and the needle part. It is an example of the flowchart which shows the flow of the process which cuts out only the value and the needle part which the needle | hook of a needle | hook type meter points out. It is an example of the flowchart which shows the process sequence of the automatic inspection method which concerns on embodiment of this invention.

  Hereinafter, modes for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the drawings. The present invention is not limited to the embodiment. In the following description and each drawing, the same reference numerals are used for the same elements or elements having the same functions, and duplicate descriptions are omitted.

  In the present invention, it is preferable to use a multi-hop wireless network (a multi-hop sensor wireless network) as a wireless network including a wireless slave station and a wireless master station, and to automate the inspection of a measuring instrument that measures the physical quantity to be inspected. Plan. A multi-hop wireless network is a wireless network in which a plurality of wireless terminals transmit data using a so-called bucket relay system via other wireless terminals adjacent to each other. Examples of the measuring instrument that measures the physical quantity to be inspected include meters such as a flow meter, a wattmeter, an ammeter, a pressure gauge, and a thermometer (for example, a needle meter).

[Multi-hop wireless network]
Here, an outline of a basic configuration of the multi-hop wireless network will be described with reference to FIG. FIG. 1 is an example of a system configuration diagram showing an outline of a basic configuration of a multi-hop wireless network.

  The multi-hop wireless network 1 according to this example includes k wireless master stations 11_1 to 11_k (hereinafter, may be described as “wireless master station 11” representatively) as base stations. These wireless master stations 11_1 to 11_k are connected to the aggregation server 3 via the network 2. The connection form of the wireless master stations 11_1 to 11_k with respect to the network 2 is not particularly limited, and may be wired connection or wireless connection.

  The wireless master stations 11_1 to 11_k are provided with m wireless slave stations 12_1 to 12_m (hereinafter, may be described as “wireless slave stations 12” representatively) as relay stations. Further, n wireless slave stations 13_1 to 13_n (hereinafter sometimes referred to as “wireless slave stations 13” as representative) are provided as terminal stations (child stations in the terminal hierarchy). That is, when the wireless master stations 11_1 to 11_k communicate with the wireless slave stations 13_1 to 13_n in the last hierarchy, the wireless slave stations 12_1 to 12_m located in the middle function as relay stations. For example, when a certain wireless master station 11_1 communicates with a certain wireless slave station 13_2, a wireless slave station located in the middle of the multi-hop wireless network 1 (in this example, the wireless slave station 12_1) relays. Communication is performed as a station.

  In the automatic inspection system using the multi-hop wireless network 1, each of the terminal wireless slave stations 13_1 to 13_n measures the measuring devices 4_1 to 4_n (hereinafter, representatively “measurement” Imaging units 14_1 to 14_n (hereinafter may be described as “imaging unit 14” as a representative). Examples of the measuring instruments 4_1 to 4_n include meters such as a flow meter that measures the flow rate of water, liquid, and the like, and a wattmeter that measures the amount of electric power.

  As the imaging units 14_1 to 14_n, a camera using a solid-state imaging device such as a CCD (Charge Coupled Device) image sensor or a CMOS (Complementary Metal Oxide Semiconductor) image sensor as an imaging device can be used. The terminal wireless slave stations 13_1 to 13_n receive the measurement results of the measuring devices 4_1 to 4_n obtained by photographing with the imaging units 14_1 to 14_n, and the wireless slave stations 12_1 that are relay stations located in the middle of the multi-hop wireless network 1 To the radio master stations 11_1 to 11_k via ~ 12_m.

  In this example, a two-layer hierarchical structure of a relay station and a terminal station is illustrated as a wireless slave station. However, the wireless slave station is not limited to two layers, and may have a hierarchical structure of three or more layers. When the wireless master station communicates with the wireless slave station in the terminal hierarchy, as described above, a plurality of wireless slave stations located in the middle of the multi-hop wireless network 1 function as relay stations. At this time, not only the wireless slave stations at the end of the communication partner, but also a plurality of wireless slave stations in the middle are activated and consume power.

  The multihop wireless network 1 described above has the advantage that the communication range that can be covered by one data collection station (wireless master station 11 or aggregation server 3) can be expanded by moving data one after another between wireless terminals. is there. In addition, by setting a multi-hop relay path so as to avoid an area where the radio wave environment is bad, the dead zone of the radio wave can be eliminated, and there is an advantage that it can contribute to high reliability of data transmission.

  In the multi-hop wireless network 1, the wireless slave station 13 and the imaging unit 14 may be installed in a place where it is difficult to supply power from the outside. In such a case, an independent power source such as a battery is used as a power source for the wireless slave station 13 and the imaging unit 14. This is because, when a commercial power source is used as the power source of the wireless slave station 13 installed in a place where power feeding is difficult, the cost of the electrical equipment such as wiring the power feeding line over a long distance or installing an outlet is increased. This is because the cost of the multi-hop wireless network 1 increases.

  As described above, in particular, in the multi-hop wireless network 1 that uses an independent power source as a power source for the wireless slave station 13 and the imaging unit 14, the wireless slave station 13 and the imaging unit 14 are connected over a long period of time with an independent power source such as a battery. In order to operate, low power consumption of the multi-hop wireless network 1 is desired. However, the reduction in power consumption of the multi-hop wireless network 1 is not a technical problem limited to the case where the wireless terminal is operated by an independent power source.

Embodiment of the present invention
As described above, in the multi-hop wireless network 1 that is an example of the wireless network, particularly in the multi-hop wireless network 1 that uses an independent power source such as a battery as the power source of the wireless slave station, low power consumption is desired. Therefore, in the embodiment of the present invention, by reducing the weight of image data to be transmitted, the power consumption (energy consumption) when transmitting in the multi-hop wireless network 1 is suppressed, that is, the power consumption is reduced.

  In the following, in the automatic inspection system that automatically inspects the measuring instruments 4_1 to 4_n using the multi-hop wireless network 1, the image data transmitted by wireless communication is reduced in weight, so that the multi-hop wireless network 1 An embodiment of the present invention that realizes low power consumption will be specifically described.

  FIG. 2 is an example of a block diagram showing a configuration of a main part of the automatic inspection system according to the embodiment of the present invention. In the present embodiment, a case where a needle meter that measures a physical quantity using a needle and a dial (scale scale) is used as the measuring instrument 4 (4_1 to 4_n) will be described as an example.

  FIG. 2 shows a system configuration in which communication is performed between a wireless master station 11 (11_1 to 11_k) that is a certain base station and a wireless slave station 13 (13_1 to 13_n) that is a certain terminal station. Is schematically illustrated. In order to facilitate understanding, the relay stations (wireless slave stations 12_1 to 12_m in FIG. 1) interposed between the wireless master station 11 and the wireless slave station 13 are not shown.

  As shown in FIG. 2, in the automatic inspection system 10 according to the present embodiment, the wireless master station 11 includes a data collection device 15 in addition to the wireless slave station 13 including the imaging unit 14. The connection form of the data collection device 15 with respect to the wireless master station 11 is not particularly limited, and may be wired connection or wireless connection. Similarly, the connection form of the imaging unit 14 to the wireless slave station 13 is not particularly limited, and may be wired connection or wireless connection.

  In addition, although the case where the data collection device 15 is arranged at the position of the wireless master station 11 is illustrated here, this is not restrictive. In other words, when the user collects data at the position of the wireless master station 11, the data collection device 15 may be arranged at the position of the wireless master station 11, and the user may use the aggregation server 3 shown in FIG. When collecting data at a position, the data collecting device 15 may be arranged at the position of the aggregation server 3.

  In the automatic inspection system 10 according to the present embodiment, the wireless slave station 13 includes a control processing unit 20, a parameter storage unit 30, and a wireless transmission unit 40.

  The control processing unit 20 is a computer or a dedicated electronic circuit device having hardware resources such as a microprocessor, a memory, an input / output unit, and a battery (all not shown) and software resources such as an operating system and a computer program. It is configured as. Then, by using these hardware resources and software resources, the function units of the image acquisition unit 21, the processing area setting unit 22, the binarization processing unit 23, the weight reduction processing unit 24, and the measurement value reading processing unit 25 are changed. For example, the image data output from the imaging unit 14 that images the measuring instrument 4 that is a needle meter is processed.

  The parameter storage unit 30 stores parameters for setting an image processing region in the processing region setting unit 22 that are preset by the user at the time of initial setting. The wireless transmission unit 40 transmits the image data processed by the control processing unit 20 to the wireless master station 11 by wireless communication. Actually, the wireless transmission unit 40 transmits transmission data such as image data to the wireless master station 11 via a relay station (not shown).

  The wireless master station 11 includes a wireless receiving unit 50. The wireless reception unit 50 receives transmission data such as image data transmitted from the wireless transmission unit 40 of the wireless slave station 13 and supplies the received transmission data to the data collection device 15.

  The data collection device 15 is, for example, a computer or dedicated electronic circuit device having hardware resources such as a microprocessor, a memory, an input / output unit, and a battery (all not shown) and software resources such as an operating system and a computer program. It is configured as. The data collection device 15 includes an inspection recording unit 60, for example. The inspection recording unit 60 records transmission data supplied from the wireless master station 11 and provides recording data to a user who checks the measurement result of the measuring instrument 4.

  In the control processing unit 20 of the wireless slave station 13, the image acquisition unit 21 acquires image data from the imaging unit 14. The processing area setting unit 22 reads out the parameter value stored in the parameter storage unit 30, combines the read parameter value and the image data acquired by the image acquisition unit 21, and sets an image processing area. The binarization processing unit 23 obtains a threshold value from the luminance value distribution of the captured image in order to reduce the weight of the image data and to read the measurement value of the measuring device 4 from the image data, and based on the threshold value, the image is obtained. Binarize the data.

  The weight reduction processing unit 24 further performs processing for reducing the weight of the image data for the image data binarized by the binarization processing unit 23. Details of the weight reduction processing in the weight reduction processing unit 24 will be described later. The measurement value reading processing unit 25 digitizes the measurement value of the measuring instrument 4 based on the image data reduced in weight by the weight reduction processing unit 24. Then, the wireless transmission unit 40 uses the multihop wireless network 1 to transmit the image data reduced in weight by the weight reduction processing unit 24 and the measurement value converted into a numerical value in the measurement value reading processing unit 25 via a relay station. Transmit to the wireless master station 11.

(Weight reduction processing in the weight reduction processing section)
Here, the weight reduction processing in the weight reduction processing unit 24 will be specifically described with reference to FIGS. 3 to 6 by taking the case where the measuring instrument 4 is a needle meter as an example.

  FIG. 3 is an example of a diagram schematically illustrating binarized image data obtained by binarizing image data acquired from the imaging unit 14. FIG. 4 is an example of a diagram schematically illustrating image data in which a region other than the processing region of the image set by the user is blackened. FIG. 5 is an example of a diagram schematically showing image data obtained by cutting out a processing area of an image set by the user. FIG. 6 is an example of a diagram schematically showing the value pointed to by the needle and image data obtained by cutting out only the portion of the needle.

  At the time of initial setting, the user sets parameters for setting the image processing area in advance and stores them in the parameter storage unit 30 of the wireless slave station 13. In the case of the captured image data 100 of the needle meter as parameters for setting the processing area of the image, in FIG. 3, as an example, the coordinates 110 of the needle rotation center, the minimum scale value and coordinates 120, and the maximum The scale value and the coordinates 130 are stored in the parameter storage unit 30. These parameter values are preferably set for each of the measuring instruments 4_1 to 4_n.

  The processing area setting unit 22 sets an image processing area based on the parameter values stored in the parameter storage unit 30. More specifically, with respect to the captured image data 100 shown in FIG. 3, based on the coordinates 110 of the needle rotation center, the minimum scale value and coordinate 120, and the maximum scale value and coordinate 130, A process for setting an area surrounding a circular portion including the dial (scale board) as an image processing area is performed.

  As shown in FIG. 4, the weight reduction processing unit 24 can perform processing for generating image data 200 in which a portion other than the processing region of the image is blacked on the captured image data 100 of the needle meter. . There are few electrical signal changes in the black areas. Therefore, by performing the process of blackening the areas other than the image processing area, the data amount of the image data after blacking can be made smaller than the data amount of the image data before blacking, that is, the image data Weight reduction can be achieved.

  Further, as shown in FIG. 5, the weight reduction processing unit 24 can perform processing for generating image data 300 obtained by cutting out the processing region of the image set by the processing region setting unit 22. In this way, the image data can be reduced in weight by performing processing for discarding unnecessary portions when reading the measurement values of the measuring instrument 4. The amount of image data to be transmitted can be further reduced as compared with the image data 200 in which the area other than the image processing area shown in FIG.

  Further, as shown in FIG. 6, the weight reduction processing unit 24 detects the position of the needle using the needle recognition technique described later on the captured image data 100 shown in FIG. A process of generating image data 400 in which only the needle portion is cut out can be performed. Even from the image data 400, the measurement value of the measuring instrument 4 can be read. In this way, the minimum necessary image data from which the user can read the measurement value of the measuring instrument 4, that is, the image data 400 obtained by cutting out only the value indicated by the needle and the needle portion is used as the transmission data. Data can be lightened to the limit.

  Here, a process of cutting out only the value indicated by the needle of the needle type meter and the needle portion using the needle recognition technique will be described with reference to the flowchart of FIG. FIG. 7 is an example of a flowchart showing a flow of processing for cutting out only the value indicated by the needle of the needle type meter and the needle portion.

  The processing in FIG. 7 is the processing in the weight reduction processing unit 24 after the processing region setting processing in the processing region setting unit 22 and the binarization processing in the binarization processing unit 23 are finished. Then, the weight reduction processing unit 24 first performs a process of cutting out only the processing region of the image set by the processing region setting unit 22 (step S11). Next, the weight reduction processing unit 24 recognizes the needle using the needle recognition technology (step S12), then detects the position of the needle (step S13), and then only the value indicated by the needle and the portion of the needle are detected. A process of cutting out the image data is performed (step S14).

(Needle recognition technology)
Here, the needle recognition technique will be described. In the needle recognition technology, the angle at which the area of the black part increases on the straight line passing through the rotation center of the needle is determined as the angle at which the needle is pointing. The center of rotation of the needle can be obtained from the coordinates 110 of the center of rotation of the needle previously stored in the parameter storage unit 30 as a parameter for setting the processing region of the image. Then, the thickness of the needle portions on both sides across the rotation center of the needle is measured, and the scale value pointed to by the thin needle portion is taken as the measurement value. In step S14, only the scale value pointed to by the fine needle portion and the needle portion are cut out.

  Next, the processing procedure of the automatic inspection method (automatic inspection method according to the embodiment of the present invention) in the automatic inspection system 10 according to the present embodiment having the above-described configuration will be described with reference to the flowchart of FIG. FIG. 8 is an example of a flowchart showing a processing procedure of the automatic inspection method according to the embodiment of the present invention.

  Hereinafter, the case where each functional unit of the control processing unit 20 is realized by a computer executed by software by interpreting and executing a program in which the microprocessor realizes each function will be described as an example. In this case, the processing described below is executed under the control of the microprocessor.

  The microprocessor controls the imaging unit 14 to execute imaging of the measuring instrument 4 (step S21), and then acquires image data acquired by the imaging unit 14 from the imaging unit 14 (step S22). Next, the processor reads the parameter value stored in the parameter storage unit 30 (step S23), and then combines the read parameter value and the image data acquired in step S22 to set an image processing area. (Step S24).

  Next, the microprocessor obtains a binarization threshold value from, for example, the luminance value distribution of the captured image, binarizes the image data using the binarization threshold value (step S25), and then reduces the weight of the image data. Is performed (step S26). The weight reduction of the image data can be performed by the weight reduction processing (see FIGS. 3 to 6) in the weight reduction processing unit 24 described above.

  Next, the microprocessor digitizes the measurement value of the measuring instrument 4 based on the image data reduced in step S26 (step S27), and then digitizes the image data reduced in step S26 and in step S27. The measurement value of the measuring instrument 4 is input to the wireless transmission unit 40 (step S28). Then, the processor controls the wireless transmission unit 40 to transmit the transmission data including the reduced image data and the digitized measurement value to the wireless master station 11 via the relay station using the multihop wireless network 1. Send.

  As described above, according to the automatic inspection system or the automatic inspection method according to the present embodiment, the image data obtained by photographing with the imaging unit 14 is binarized, and the measuring device 4 out of the binarized image data. By cutting out and transmitting the image data of the measured value portion, the transmission data can be reduced in weight. And by reducing the weight of transmission data, the power consumption (energy consumption) at the time of transmitting with the multihop wireless network 1 can be suppressed, and the power consumption can be reduced.

  In addition, due to the low power consumption of the multi-hop wireless network 1, in particular, in the multi-hop wireless network 1 that uses an independent power source such as a battery as the power source of the wireless slave station, the wireless slave station can be operated for a long time with the independent power source such as a battery. There is an advantage that it can be operated over a wide range. However, even in the multi-hop wireless network 1 that does not use an independent power source as the power source of the wireless slave station, the effect of suppressing the power consumption (energy consumption) of the network and reducing the power consumption is great.

  Further, for example, the user collects the physical quantity to be inspected from the image data of the measurement value portion transmitted from the wireless slave station 13, more specifically from the measured value obtained by quantification, in the data collection device 15 on the wireless master station 11 side. Can be acquired. Here, there are cases where the digitized measurement value does not necessarily accurately reflect the measurement value of the measuring instrument 4. In other words, when performing the digitization, the measurement value of the measuring instrument 4 is not necessarily digitized into an incorrect value.

  Therefore, in the automatic inspection system or the automatic inspection method according to the present embodiment, not only numerical measurement values but also lightened image data are transmitted. Thereby, when the user determines from the past data or the like that the transmitted measurement value may be wrong, the needle points at the needle meter using the transmitted image data as evidence. By reading the value directly, it is possible to acquire (check) an accurate physical quantity to be inspected.

  From such a viewpoint, it is preferable to transmit the image data reduced in weight together with the measured value obtained as a numerical value. However, it is not essential to transmit the reduced-weight image data together with the numerical measurement value, and only the numerical measurement value may be transmitted. Then, there is an advantage that the transmission data can be further reduced in weight by transmitting only the numerical measurement values.

[Modification]
As mentioned above, although this invention was demonstrated using embodiment, this invention is not limited to embodiment mentioned above, Various modifications are included. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to the one having all the configurations described.

  In the above-described embodiment, the needle meter is exemplified as a measuring instrument for measuring the physical quantity to be inspected. However, the present invention is not limited to the needle meter, and a segment type, a scale type, a bar graph type, a digital type, etc. It may be a meter. Then, the image data obtained by photographing these meters are binarized, and the image data of the measurement value portion is cut out and transmitted from the binarized image data, thereby reducing the transmission data weight. it can.

  DESCRIPTION OF SYMBOLS 1 ... Multihop wireless network, 2 ... Network, 3 ... Aggregation server, 4 (4_1-4_n) ... Measuring instrument, 10 ... Automatic inspection system, 11 (11_1-11_k) ... Radio | wireless master station (base station), 12 (12_1) To 12_m) ... wireless slave station (relay station), 13 (13_1 to 13_n) ... wireless slave station (terminal station), 14 (14_1 to 14_n) ... imaging unit, 15 ... data collection device, 20 ... control processing unit, 21 DESCRIPTION OF SYMBOLS ... Image acquisition part 22 ... Processing area setting part 23 ... Binarization processing part 24 ... Lightening processing part 25 ... Measurement value reading processing part 30 ... Parameter storage part 40 ... Wireless transmission part 50 ... Wireless Receiving part, 60 ... Inspection recording part

Claims (7)

A wireless slave station having an imaging unit that captures a measuring instrument that measures a physical quantity to be inspected, and a wireless master station that receives image data obtained by imaging with the imaging unit by wireless communication from the wireless slave station An automatic inspection system using a wireless network including
The wireless slave station is
A binarization processing unit that binarizes the image data to generate binarized image data;
Of the binarized image data, a weight reduction processing unit that cuts out image data of a measurement value portion of the measuring instrument,
A wireless transmission unit that transmits image data of the measurement value portion cut out by the weight reduction processing unit to the wireless master station;
An automatic inspection system characterized by comprising: The weight reduction processing unit, based on the image data of the measurement value portion of the measurement instrument, digitizes the measurement value of the measurement instrument,
The automatic inspection system according to claim 1, wherein the wireless transmission unit transmits the measured value digitized by the weight reduction processing unit to the wireless master station. The wireless transmission unit transmits the measurement value quantified by the weight reduction processing unit and the image data of the measurement value part cut out by the weight reduction processing unit to the wireless master station. The automatic inspection system according to claim 2. The measuring instrument is a needle meter,
The weight reduction processing unit detects the position of the needle of the needle-type meter as image data of the measurement value portion of the measuring instrument, and cuts out only the value indicated by the needle and the image data of the needle portion. The automatic inspection system according to claim 1, wherein the system is an automatic inspection system. 5. The automatic inspection system according to claim 4, wherein the weight reduction processing unit blackens a portion other than a processing region of an image set in advance by the user with respect to the binarized image data. The automatic inspection system according to claim 1, wherein the wireless network is a multi-hop wireless network. A wireless slave station having an imaging unit that captures a measuring instrument that measures a physical quantity to be inspected, and a wireless master station that receives image data obtained by imaging with the imaging unit by wireless communication from the wireless slave station An automatic inspection method using a wireless network including
In the wireless slave station,
Binarizing the image data to generate binarized image data;
Of the binarized image data, cut out the image data of the measurement value portion of the measuring instrument,
The automatic inspection method characterized by transmitting the cut image data of the measured value portion to the wireless master station.

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