JP3035916U - Plant monitoring equipment - Google Patents

Abstract

(57) [Summary] (Correction) [Problem] It is possible to automatically determine an abnormality of an instrument or the like in real time. When an instrument with an identification code is photographed and the indicated value is abnormal, an alarm is issued. SOLUTION: A liquid level gauge 13, pointer gauges 14, 15 and a pipe 11 are photographed by a video camera 21, an identification code of a label attached is read to identify an object, and the read measurement value and management data. If there is an abnormality, the monitor 39 displays the abnormality occurrence and issues an alarm. In addition, regarding the image pickup signal of the pipe 11, the image (signal) binarized and the image taken in advance at the time of initialization etc.
An abnormality is determined by comparing with the reference image (signal) that has been digitized, and if there is an abnormality, an alarm is issued.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a plant monitoring device used for measuring and monitoring the indicated value of a meter in a plant or the like and for remote monitoring of liquid leaks in piping, and more specifically, whether or not the indicated value of the meter is appropriate, and The present invention relates to a plant monitoring device that can automatically determine the occurrence of an abnormality such as a leak.

[0002]

[Prior art]

 As a conventional instrument monitoring device, for example, one described in Japanese Patent Application Laid-Open No. 5-260477 or Japanese Patent Application Laid-Open No. 2-79699 is known. The former Japanese Patent Application Laid-Open No. 5-260477 describes a monitoring device in which a monitoring person travels around the site with a camera, photographs the instrument with the camera, and reads the instrument with a signal captured by the camera.

Further, in the latter Japanese Patent Laid-Open No. 2-79699, a self-propelled vehicle is equipped with a television camera and a measurement processing device, the television camera reads an instruction value of an instrument, and an image pickup signal of the television camera is measured by the measurement processing device. What is processed by the above and transferred to the host computer is described.

[0004]

[Problems to be solved by the device]

 However, in the former monitoring device disclosed in Japanese Patent Laid-Open No. 5-260477, the worker himself / herself has to go to the work site, so work is performed at a high temperature / high humidity site or a site where there is a risk of radiation exposure. Personnel cannot be sent frequently and the number of measurements is limited, and the person in charge has to judge whether the guideline value of the instrument is proper by analyzing the image of the camera taken after shooting. There was also a problem that the abnormality could not be judged in real time.

Further, in the latter monitoring device disclosed in Japanese Patent Laid-Open No. 2-79699, a normal value for each instrument must be input to the host computer in order to determine whether or not the measurement result is normal. However, it was difficult to determine the abnormality in real time. The present invention has been made in view of the above problems, and an object thereof is to provide a monitoring device capable of frequently measuring even in a harsh environment, and capable of automatically determining an abnormality of a measuring instrument or the like in real time. And

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the invention of claim 1 is a plant monitoring apparatus for photographing a measuring instrument with a camera and image-processing an image pickup signal of the camera to create monitoring data indicating an indicated value of the measuring instrument. The management data is stored in a memory with a monitoring point identification code, and a label with the monitoring point identification code is provided on the instrument, and the label is photographed by the camera together with the instrument. The imaged signal is image-processed to read the monitoring point identification code and the monitoring data is created. By referring to and comparing, it is determined whether the indicated value of the instrument is normal or not, and an alarm is output when an abnormality occurs.

The invention of claim 1 is a pointer-type meter in which the meter positions a pointer on an index value and displays a measured value, and the image processing of the image pickup signal of the camera extracts the pointer. A mode in which the coordinates of both ends are calculated, the tilt angle of the pointer is calculated from the coordinate values, and the indication value is determined from the tilt angle of the pointer and the data table of the angle and the index value included in the management data (claim 2). ), And the liquid level indicator in which the instrument positions and displays the liquid level as an index value, and the image processing of the imaging signal of the camera extracts the liquid level and calculates the coordinate value of the liquid level. The coordinate value may be determined and the instruction value may be determined from the maximum coordinate value and the minimum coordinate value included in the management data (claim 3).

Further, in the invention of claim 4, in a plant monitoring device for photographing and monitoring a monitored portion of a piping system with a camera, the image pickup signal of the monitored portion output by the camera is binarized. Quantization processing means, reference signal storage means for binarizing the image pickup signal photographed at the time of reference by the binarization processing means and recording and holding the binarized signal stored in the reference signal storage means and the two And a determination unit that determines the occurrence of an abnormality by comparing the binarized signal output from the binarization processing unit.

Further, the invention of claim 4 provides a mode (claim 5) in which the recording and holding means holds the image pickup signal at the time of the previous image pickup processing which has been binarized, and also in the monitoring point of the pipe system. A label having a monitoring point identification code is provided, the label is photographed by the camera, the monitoring point identification code is read, and the image pickup signal of the monitoring required point output by the camera is specified by the monitoring point identification code. Aspect Aspect (Claim 6) can be configured.

The plant monitoring device according to claim 1 captures an instrument and a label with a camera, performs image processing on an image pickup signal of the camera to obtain indicator value data of the instrument, and interprets the label identification code of the label. Specify the indicated value data using the monitoring point identification code. Then, the management data is read from the memory by this monitoring point identification code, and this management data and the instruction value data are compared to determine whether or not it is normal. Therefore, the occurrence of an abnormality can be automatically determined, and the occurrence of the abnormality can be notified in real time.

Further, the plant monitoring apparatus according to claim 4 binarizes the image pickup signal of the camera, and picks up the binarized image pickup signal at the time of this photographing and the reference time (at the time of initialization or the last photographing). If there is a predetermined change by comparing with the binarized image pickup signal, it is judged that an abnormality such as liquid leakage from the pipe has occurred. For this reason, it is not necessary to perform complicated image processing, and it is possible to detect an abnormality occurrence with a device having a simple configuration.

[0012]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 12 show a plant monitoring apparatus according to an embodiment of the present invention. FIG. 1 is a schematic diagram, FIG. 2 is a block diagram of a control system, FIG. 3 is a schematic diagram of a pointer instrument, and FIGS. , 6 are operation explanatory views, FIGS. 7 to 9 and FIGS. 11 and 12 are flow charts showing control processing, and FIG. 10 is an operation explanatory view.

In FIG. 1, 10 is a monitoring target area in a plant such as a nuclear power plant, and 21 is a television camera arranged so that the monitoring target area 10 can be photographed. A pipe 11 is provided in the monitoring target area 10, a liquid level gauge 13 for visually displaying the liquid level in the reservoir tank 12, and a finger for displaying the pressure in the pipe 11 and the liquid level in the reservoir tank 12. An instrument panel 16 having needle instruments 14, 15 is provided. Then, a label 11a with an identification code is attached to the pipe 11 at a monitoring point such as a joint, and similarly, a label 13a with an identification code is provided on the liquid level gauge 13, and a label 13a is provided on the instrument panel 16. Labels 14a and 15a having identification codes are attached to the respective pointer measuring instruments 14 and 15.

The labels 11a, 13a, 14a, 15a are identified by using a field code as shown in FIGS. 3a and 3b, a bar code, an Arabic numeral as shown in FIG. 3c or an alphabet as shown in FIG. 3d. Code is described. The identification codes of the labels 11a, 13a, 14a and 15a are given to the monitoring required points of the pipe 11, the liquid level gauge 13 and the needle gauges 14 and 15, respectively. In this embodiment, a label with an identification mark is attached, but the identification mark can be provided by an appropriate method such as engraving.

The television camera 21 has a zoom lens 21 a and is installed on a mounting table 22 capable of XYZθ position control. The video camera 21 is connected in parallel to an image processing device 30 and a monitor 39 installed in a management room or the like to photograph the above-mentioned pipe 11 and the like, and the zoom lens 21a is connected to the image processing device 30. Although detailed description and illustration are omitted, the zoom lens 21a is controlled by the image processing device 30 in conjunction with the mounting base 22, and is preset according to the operation of the mounting base 22, that is, the change of the shooting target of the video camera 21. The zoom ratio is set.

The mounting table 22 is connected to a photographing position controller 23, and is controlled by the photographing position controller 23. The photographing position controller 23 pre-inputs and stores position information corresponding to the above-mentioned monitoring required points of the pipe 11, the liquid level gauge 13, and the photographing positions of the pointer gauges 14 and 15, and switches from the image processing device 30. The position, that is, the shooting direction of the camera 21 is changed according to the signal. Then, the camera 21 synchronizes with the position switching of the mounting base 22 and photographs the monitoring points of the pipe 11, the liquid level gauge 13, and the pointer gauges 14 and 15 in the fields of view including the labels 11a, 13a, 14a and 15a, respectively. , The image signals of the pipes 11 where monitoring is required (hereinafter, pipe image signals), the image signals of the liquid level gauge 13 (hereinafter, liquid level image signals), the image signals of the pointer gauges 14 and 15 (hereinafter , Instrument image signal) to the image processing device 30.

Needless to say, the mounting table 22 does not necessarily have to be capable of XYZθ control, and it is also possible to use one capable of only θ control, that is, a rotary table or the like. The position of the mounting table 22 can be adjusted manually by a worker or the like.

As shown in FIG. 2, the image processing apparatus 30 has a CPU 32, a memory 33, a mounting control circuit 34, an image processing section 35, and an alarm device such as a buzzer or a lamp (not shown). Then, the image processing unit 35 includes the image memory 31, the image difference circuit 51, the binarization circuit 52, the identification code extraction circuit 53, the identification code reading circuit 54, the measurement / monitoring program selection circuit 55, the instrument extraction circuit 56, and the pointer. It has an extraction circuit 57, a pointer coordinate calculation circuit 58, an angle calculation circuit 59, an instrument information extraction circuit 61, an instruction value calculation circuit 62, a management value comparison circuit 63 and a screen display circuit 64.

The image memory 31 is connected to the camera 21 to store the image signal of the camera 21, the CPU 32 is composed of a well-known microprocessor and the like, and the memory 33 is composed of a hard disk device and the like. In this memory 33, a management data file for each of the pipe 11, the liquid level gauge 13, and the pointer gauges 14 and 15 is stored with an identification code as a file name. As will be described later, the management data file contains data indicating the position of the label on the screen, instrument classification data, etc. Furthermore, the management data file for the piping 11 is the name of the binarized image data file at the time of reference, etc. The control data file for the liquid level gauge 13 displays the maximum and minimum coordinate values, the range of display scale values, the range of normal values, etc., and the control data file for the pointer meters 14 and 15 is displayed. Includes data such as scale value, display scale angle, and normal value range.

The image memory 31 is a memory that can store at least one frame of image data output from the video camera 21, for example, a frame memory. The binarization circuit 52 binarizes the difference image signal to create a binary image, for example, a binary image (signal) binarized in black and white or brightness in pixel units. The image difference circuit 51 is a binary image signal of two frames separated from the binarization circuit 52 at the time of photographing, for example, a binary image signal photographed at initialization or last time and a binary image signal photographed this time (currently). When the piping images of these two frames are different from each other, a difference image is created by extracting a different portion and a difference image signal is output to the screen display circuit 64.

That is, as will be described later, the image difference circuit 51 is configured such that, for example, when a captured image at a monitoring point of the pipe 11 is different between before and after capturing, for example, liquid leaks and drops. The differential image signal is output to the screen display circuit 64 when it is dripping on the screen or when steam is ejected. Then, the screen display circuit 64 outputs an alarm display signal to the monitor 39 to display an alarm message on the monitor screen when the difference image signal is input, in other words, when an abnormality such as liquid leakage occurs, Sound a buzzer, etc. if necessary.

The identification code extraction circuit 53 recognizes the outer shapes of the labels 11a, 13a, 14a, 15a based on the image signal binarized by the binarization circuit 52 by pattern matching, labeling, etc., and recognizes this. The label is determined by comparing the shape with a previously stored shape. The identification code reading circuit 54 reads the above-mentioned identification code from the label recognized by the identification code extracting circuit 53. The measurement / monitoring program switching circuit 55 selectively reads out and activates the measurement / monitoring program corresponding to the identification code based on the identification code read by the identification code reading circuit 54.

The meter extracting circuit 56 recognizes the outer shapes of the liquid level gauge 13 and the pointer measuring instruments 14 and 15 based on the binary image signal binarized by the binarizing circuit 52, and extracts them. The pointer extraction circuit 57 extracts, as a pointer, a rod-shaped portion in the instrument shape extracted by the instrument extraction circuit 56 based on the binarized image signal. The pointer coordinate calculation circuit 58 calculates the coordinates of the end points (base end and tip) of the pointer and determines that the end near the center of the screen is the center of the instrument, that is, the center of rotation of the pointer. The angle calculation circuit 59 calculates the inclination angle θ of the pointer by the following equation, with the end portion regarded as the center of opening of the store as the base end. However, as will be described later, the following formula is valid only when the angle θ is within a predetermined range.

[0024]

(Equation 1)

The instrument information extraction circuit 61 reads out a relational table of angles and instruction values of each instrument and a normal value range (control range) of instruction values which are recorded in advance in the memory 33. The indicated value calculation circuit 62 refers to the data table read by the instrument information extraction circuit 61 and obtains the indicated value of the instrument in the image from the angle obtained by the above equation 1. The indicated value calculating circuit 62 calculates the indicated value of the meter by proportional calculation when there is no indicated value corresponding to the angle obtained by the above equation. The management value comparison circuit 63 compares the management range read by the instrument information extraction circuit 61 with the obtained instruction value, and outputs an abnormality occurrence signal if the instruction value is outside the management range. The screen display circuit 64 displays the obtained indicating value together with the management range on the monitor in the monitoring room, and also displays an alarm message on the monitor screen when an abnormality occurs.

It should be noted that, although this embodiment is configured by various circuits, it is needless to say that a part of the functions of these circuits can be achieved by an MPU or the like.

In this embodiment, a management data file is created in advance for the pointer gauges 14 and 15, the liquid level gauge 13 and the pipe 11. This management data file contains image determination start coordinate values and image determination end coordinate values that indicate the label determination area, the identification code (control point identification code) unique to the pipe 11 and the like written on the label 11a, etc. It is recorded using a name that includes information and that can identify individual instruments, for example, the same file name as the identification code.

As the image determination start coordinate value and the image determination end coordinate value, the coordinates of two points that can specify the determination region, for example, if the determination region is a rectangle, the diagonal coordinate values of two points are used. As the instrument classification, a code unique to each instrument is used, for example, "1A", "1B" for the pointer instruments 14 and 15, "2" for the liquid level gauge 13, "3" for the pipe 11 and the like. The gauge information includes display scale values, display scale angles and normal value files (control range) for the pointer gauges 14 and 15, and maximum coordinate values, minimum coordinate values, display scale values for the liquid level gauge 13. For the normal value range and the like, the pipe 11 includes the data file name of the binary image signal of the reference time photographing.

Then, as shown in FIG. 4, a management data file of the pointer measuring instruments 14 and 15 is created by displaying a photographed image of the pointer measuring instruments 14 and 15 on the monitor 39 and using a mouse or the like on the monitor 39 screen. The label 14a, 15a is designated by the range, the coordinates of the two corners a, b of this designated range are read and recorded, and other data such as instrument classification is manually input from the keyboard or the like and recorded. To give a concrete example of the management data file of the pointer instruments 14 and 15 shown in FIG. 4, the identification code (ABC-DE) of the label is adopted as the file name, and a in the figure is used as the image determination start coordinate value. The coordinates of the points, the coordinates of the point b in the figure as the image determination end coordinate values are “1” as the instrument classification, 10 to 50 kg as the display scale value, 0 to 180 ° as the display scale angle, and 10 as the normal value range. Data of 30 kg is recorded.

The management data file of the liquid level gauge 13 is also created in the same manner as the above-mentioned pointer gauges 14 and 15. That is, as shown in FIG. 5, the range of the label 13a on the screen of the monitor 39 is designated by the mouse, and the data such as the instrument classification is input from the keyboard or the like. As a specific example of the management data file for the liquid level gauge 13 in FIG. 5, the identification code (123-DE) of the label 13a is recorded as a file name and the image determination start coordinate value is set as the image determination start coordinate value in FIG. The coordinate of point a in the figure, the coordinate of point b in the figure as the coordinate value at the end of the image determination is “2” as the instrument category, the coordinate of point c in FIG. 5 as the maximum coordinate value, and the coordinate as the minimum coordinate value in FIG. The coordinates of the point d are recorded as a display scale value of 30 to 50 cc and a normal value range of 40 to 50 cc.

Further, the management data file for the pipe 11 is also created by photographing the pipe 11 with the video camera 21 and displaying it on the monitor 39 as in the case of the above-described pointer gauges 14, 15 and liquid level gauge 13. The range of the label 11a in the display image of 39 is designated by the mouse, and data such as instrument classification is input (see FIG. 6). To describe an example of the management data file for the piping 11 shown in FIG. 6, the identification code of the label (123-12) is recorded as the file name, and the coordinates of the point a in the figure are used as the image determination start coordinate values. The coordinate of point b in the figure is recorded as the image determination end coordinate value, and “3” is recorded as the instrument classification, and the binary data file name is recorded.

Then, at the time of monitoring, the pointer gauges 14 and 15, the liquid level gauge 13 and the pipe 11 in the monitored area 10 of the plant are photographed by the television camera 21. Here, although the illumination is not mentioned, appropriate illumination is appropriately applied to the pipe 11, the liquid level gauge 13, and the meters 14 and 15 to maintain an appropriate illuminance. In particular, since the liquid level gauge 13 has a different reflection angle of light at the raised portion due to the surface tension of the liquid surface, the liquid surface can be easily recognized by applying illumination.

Then, the main routine shown in the flowchart of FIG. 7 is executed in the image processing device 30 to process the image pickup signal of the television camera 21. That is, first, in step S1, the identification code is deciphered by performing a subroutine of the process of determining the monitoring targets of the photographed instruments 13, 14, 15 and the piping 11, etc., the target is specified, and the management data file is read (described later). To). Then, in step S2, a program corresponding to the instrument classification in the read management data file is selected and executed. That is, if the monitoring target (imaging target) is a pointer meter, the pointer angle calculation subroutine is executed in step S3 to calculate the indicated value, and if the monitoring target is a liquid level meter, step S4 is performed. In step S5, the subroutine for the water level position calculation process is executed to calculate the indicated value, and if the monitored object is a pipe, the subroutine for the binary image signal analysis process is executed in step S5 to leak the liquid or vapor. The presence or absence of is determined.

After that, the indication values of the pointer measuring instruments 14, 15 and the liquid level gauge 13 obtained in step S6 are displayed on the monitor 39, and in the following step S7, it is determined whether or not the indication values are within the normal value range. Also, it is determined whether or not liquid or vapor leakage has occurred, and if the indicated value is abnormal or if leakage has occurred, an alarm message is displayed on the monitor 39 or a buzzer sound is output in step S8. Perform alarm processing such as ringing. Next, in step S9, it is determined whether or not the video switching of the video camera 21 has occurred. If the video switching has not occurred, the same monitoring target is continuously monitored, and the video switching occurs. If so, the monitoring target is switched and the processing from step S1 is performed.

In the above-described monitoring target determination processing in step S1, the image pickup signal is captured in step S11, and the file name of the corresponding management data file is acquired in step S12, as shown in FIG. The file name of this management data file is read from the memory 33 or the like according to the control signal of the mounting table 22, that is, the object to be photographed by the video camera 21. Next, in step S13, the management data file is read out based on the file name to acquire the management data file, and in step S14, the management data file (file name) and the identification code acquired from the image pickup signal are compared. Then, in step S15, the collation result is judged. If they match, the process returns to the main routine, and if they do not match, the processes from step S12 are performed again.

Further, the processing of calculating the pointer angle in step S3 performs the processing shown in the flowchart of FIG. That is, first, the entire pointer meters 14 and 15 are extracted in step S31, and the pointer portion is extracted in step S32. Then, in step S33, the coordinates (Xe, Ye) and (Xs, Ys) of both ends of the pointer are extracted, the center of rotation of the pointer is determined in step S34, and the angle θ of the pointer is calculated by the following equation 2 in step S35. Then, in step S36, the scale value of the image currently narrowed down is calculated based on the display scale value and the display scale angle of the normal value information file and displayed on a monitor or the like.

[0037]

(Equation 2)

In the above expression 2, since 0 (zero) division is impossible, the angle θ is calculated as a fixed value according to the conditions as shown in Table 1 below, and Correction is performed using the correction formula shown in the right column of Table 2 below.

[0039]

[Table 1]

[0040]

[Table 2]

More specifically with reference to FIG. 10, if the pointer is in the state shown by N1 to N12 in the figure, the angle is changed from the above equation 2 and Tables 1 and 2 as shown in Table 3 below. It is calculated.

[0042]

[Table 3]

Further, the water level position calculation processing of step S4 performs the processing shown in the flowchart of FIG. First, the water level portion (liquid level) is extracted in step S41, and the water level barycentric coordinate is calculated in step S42. Then, in step S43, the scale value (Y coordinate value) of the currently captured image is calculated based on the maximum coordinate value, the minimum coordinate value, and the display scale value of the management data file and displayed on the monitor 39. That is, to give a specific example, the water level barycentric coordinates calculated in step S42 are (300, -500), the maximum coordinate values are (300, -300), and the minimum coordinate values are (300, -600). ), If the displayed scale value is 40 to 50 cc, the scale value m is calculated as shown in the following formula. m = (50-40) / (-300-(-600)) * (-300-(-500)) + 40 = 46.66cc

Furthermore, the analysis process of the binarized image in step S5 is the process shown in the flowchart of FIG. First, the pipe section is extracted in step S51, and the binarized image signal of the currently displayed image is acquired in step S52. Then, in step S53, a difference between the binarized image signal of the currently displayed image and the binarized image signal acquired at the time of setting the initial value is calculated, and an abnormality is determined from the difference between these binarized image signals.

In the above-mentioned embodiment, no reference is made to means for recording abnormalities in the measuring instruments 13, 14, 15 and the pipe 11, but these data may be recorded in a recording device such as a magnetic disk. It is also possible to output these data on paper using a printer. In addition, in the above-described embodiment, it is possible to suspend the video camera 21 on a rail or the like installed on the ceiling and run along the rail to monitor instruments and pipes at different locations.

Further, in the above-mentioned embodiment, although no particular reference is made to the monitoring cycle or sequence of the pointer gauges 14 and 15, the liquid level gauge 13 and the pipe 11, the monitored object is measured and monitored in a short cycle. Some items are required to be performed and some items may be supported even if the measurement / monitoring cycle is long. Therefore, set the monitoring order in advance according to the object to be monitored, and follow the order from the controller 23 to the mounting platform. It is also possible to output a control signal to 22 to control the monitoring order and cycle.

[0047]

[Effect of the invention]

 As described above, according to the plant monitoring apparatus of the first aspect of the present invention, the label provided with the identification code is provided on the instrument, and the management data is stored by specifying the identification code. The identification code of the label is read by a camera, the image of the instrument is identified by the identification code, the image of the instrument is image-processed to determine the measurement value, and the measurement value and management data are stored. Since the abnormality is compared by comparing the above, it is possible to determine the measurement value of the instrument remotely and to know the occurrence of the abnormality in real time.

Further, according to the plant monitoring apparatus of the fourth aspect of the present invention, the piping and the like are photographed by the camera and binarized, and the binarized image (signal) and the image are preliminarily photographed. Since the anomaly is determined by comparing the binarized reference image (signal), it is not necessary to perform complicated image processing, and an abnormality such as liquid or vapor leakage can be reliably determined with a simple device. can do.

Particularly, in the plant monitoring device according to the fourth aspect of the present invention, a label provided with an identification code within the same field of view of the camera is provided near a pipe or the like, and the identification code is processed by processing the image pickup signal of the camera. Since it is legible, it is possible to specify the monitoring point and easily perform not only monitoring but also subsequent actions.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a plant monitoring apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram of a control system of the plant monitoring device.

3A, 3B, 3C, 3D and 3D are schematic diagrams showing a label mode in the plant monitoring apparatus.

FIG. 4 is a schematic view of a pointer measuring instrument displayed on a monitor in the plant monitoring device.

FIG. 5 is a schematic view of a liquid level gauge displayed on a monitor in the plant monitoring device.

FIG. 6 is a schematic diagram of piping displayed on a monitor in the plant monitoring device.

FIG. 7 is a flowchart showing a main routine of control processing in the plant monitoring device.

FIG. 8 is a flowchart showing a subroutine of the control process.

FIG. 9 is a flowchart showing another subroutine in the control process.

FIG. 10 is a diagram for explaining angle calculation of a pointer in the control process.

FIG. 11 is a flowchart showing yet another subroutine in the control processing.

FIG. 12 is a flowchart showing still another subroutine in the control process.

[Explanation of symbols]

 10 Areas to be Monitored 11 Piping (Points to be Monitored) 11a Label 13 Liquid Level Gauge 13a Label 14 Pointer Meter 14a Label 15 Pointer Meter 15a Pointer Meter 21 Television Camera 22 Mounting Platform 23 Imaging Position Controller 30 Image Processor 32 CPU 33 Memory 34 Mount base control circuit 35 Image processing unit 39 Monitor 51 Image difference circuit 52 Binarization circuit 53 Identification code extraction circuit 54 Identification code reading circuit 55 Measurement / monitoring program selection circuit 56 Instrument extraction circuit 57 Pointer extraction circuit 58 Pointer coordinate calculation circuit 59 Angle calculation circuit 61 Instrument information extraction circuit 62 Indication value calculation circuit 63 Management value comparison circuit 64 Screen display circuit

Claims (6)

[Utility model registration claims] 1. A plant monitoring apparatus for photographing a measuring instrument with a camera and image-processing an image pickup signal of the camera to create monitoring data indicating an indicated value of the measuring instrument, wherein management data of the measuring instrument is stored in a memory as a monitoring point identification code. The label with the monitoring location identification code is provided on the instrument, the label is photographed by the camera together with the instrument, and the image pickup signal of the camera is image-processed to identify the monitoring location. The code is read and the monitoring data is created, the monitoring data is specified by the monitoring point identification code, the monitoring data and the management data are compared with reference to the monitoring point identification code, and the indicated value of the instrument is A plant monitoring device which determines whether it is normal and outputs an alarm when an abnormality occurs. 2. A pointer-type measuring instrument in which the measuring instrument positions a pointer on an index value and displays a measured value, and the image processing of the image pickup signal of the camera extracts the pointer and calculates the coordinates of both ends, 2. The plant monitoring device according to claim 1, wherein an inclination angle of the pointer is calculated from the coordinate value, and the indication value is determined from a data table of the inclination angle of the pointer, the angle included in the management data, and the index value. 3. A liquid level gauge for displaying the liquid level by positioning the liquid level on an index value, and image processing of an image pickup signal of the camera extracts the liquid level and determines coordinate values of the liquid level. The plant management apparatus according to claim 1, wherein the coordinate value is determined from a maximum coordinate value and a minimum coordinate value included in the management data. 4. A plant monitoring apparatus for photographing and monitoring a monitored portion of a piping system with a camera, and a binarization processing means for binarizing an image pickup signal of the monitored portion output by the camera, and a reference. Reference signal storage means for binarizing and recording the image pickup signal captured at times by the binarization processing means, a binarized signal stored in the reference signal storage means and the binarization processing means. A plant monitoring device comprising: a determination unit that compares the binarized signal to determine whether an abnormality has occurred. 5. The plant monitoring apparatus according to claim 4, wherein the record holding unit holds a binarized image pickup signal at a previous image pickup. 6. A label having a monitoring point identification code is provided at a monitoring point of the piping system, the label is photographed by the camera to read the monitoring point identification code, and the monitoring point is output by the camera. The plant monitoring device according to claim 4 or 5, wherein the image pickup signal is identified by the monitoring point identification code.