JP4570499B2 - Meter recognition system, meter recognition method, and meter recognition program - Google Patents

Description

  The present invention relates to a meter recognition system, a meter recognition method, and a meter recognition program.

For example, when conducting an energy usage survey in factories or the like, automatic measurement has been difficult because an indicator (meter) that does not have a function of transmitting an instruction value is generally installed.
Therefore, for example, under the problem of automatically reading the indicated value of the analog meter by image processing, or obtaining a digital signal suitable for computer management, the rotation center of the indicating needle and the movement of the indicating needle for the image of the analog meter are obtained. The range of the scale plate is plain and the arc-shaped needle movable area centered on the rotation center, the scale information of the scale plate is set, and the reference image of the analog meter before starting the measurement and the instructions The image of the needle movable area is extracted from the measurement image of the analog meter in a state where the needle is rotated, and the extracted two images are subjected to polar coordinate conversion based on the rotation center to linearly indicate the rotation angle of the pointing needle. Each of the images is converted into an image, the rotation angle of the indicator needle is determined based on the two images after the polar coordinate conversion, and the calculated rotation angle is associated with the scale information. An automatic reading method for an analog meter (see Patent Document 1) has been proposed and obtaining an indication of the indicator needle image.
JP 2004-133560 A

  However, in the conventional method, the reference value recognition reference pattern is fixed, and it is difficult to reliably perform the instruction value recognition corresponding to the meter type and various situation changes. Therefore, the indicator value is accurately recognized according to the form of the meter scale and indicator needle (eg, a scale arranged in a semicircular arc shape, an indicator needle that rotates in response to the scale, and a scale interval that is not constant). The process of doing was not done efficiently.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a meter recognition system, a meter recognition method, and a meter recognition program that enable reliable and efficient instruction value recognition corresponding to various situations such as meter type.

The meter recognition system of the present invention that solves the above problems is a system for recognizing a scale instruction of a needle-type or bar-type meter, displaying a photographed image of the scale instruction on an output interface, and recognizing the photographed image. An area setting unit that accepts specification of a minimum value and a maximum value indicated by a shooting scale in the recognition area and the recognition area from an input interface, and a plurality of parts that divide the minimum / maximum value at predetermined intervals with the minimum / maximum values at both ends of the scale The comparison scale is overlaid on the recognition area and displayed on the output interface, and the input of each corresponding value of the plurality of comparison scales in the imaging scale is received from the input interface, and becomes a break at the predetermined interval. A scale difference specifying unit that specifies the correspondence between each value of the comparative scale and the value of the photographing scale, and the recognition value from the photographed image. From the scale readings by the comparative scale of the meter to be subtraction processed a minimum value by the comparison scale in the scale reading is contained Ru at a constant interval of said separated by a plurality of comparative scale interval Then, the processing result value is divided by the amount of change of the value by the comparison scale in the predetermined section in which the scale instruction value is included, and the ratio that the scale instruction value occupies in the predetermined section is calculated. A conversion instruction is performed by multiplying the amount of change of the value by the shooting scale in the predetermined section by the ratio, and adding the minimum value by the shooting scale in the predetermined section to the processing result value. A conversion instruction value calculation unit that calculates a value and outputs the value to an output interface.

The meter recognition method of the present invention is a method for recognizing a scale instruction of a needle-type or bar-type meter, displaying a photographed image of the scale instruction on an output interface, and a recognition area in the photographed image and the Accepting designation of the minimum and maximum values indicated by the imaging scale in the recognition area from the input interface, and recognizing a plurality of comparative scales that divide the minimum and maximum values at predetermined intervals with the minimum and maximum values as both ends of the scale. In addition to displaying on the output interface overlaid on the area, the input of each corresponding value of the plurality of comparison scales in the imaging scale is received from the input interface, and the value of each of the comparison scales serving as the predetermined interval identifying the correspondence between the value of the imaging scale than the scale readings by the comparative scale of the meter that is recognized from the captured image, wherein The minimum value subtracted by the comparison scale at a constant interval in which the Ru contains scale readings of the separated sections in number of comparison memory, the processing result value includes the scale indicated value Dividing by the amount of change of the value by the comparative scale in the predetermined section, the ratio of the scale indication value in the predetermined section is calculated, and the ratio to the amount of change of the value by the photographing scale in the predetermined section The conversion instruction value is calculated by adding the minimum value of the imaging scale in the predetermined section to the processing result value, and the result is output to the output interface.

Further, the meter recognition program of the present invention is a program for causing a computer to execute a method for recognizing a scale instruction of a needle-type or bar-type meter, displaying a photographed image of the scale instruction on an output interface, A step of accepting designation of a recognition area in the captured image and a minimum value and a maximum value indicated by a shooting scale in the recognition area from an input interface; and the minimum and maximum values at both ends of the scale and a predetermined interval between the minimum and maximum values A plurality of comparison scales to be separated are displayed on the output interface so as to overlap the recognition area, and input of each corresponding value of the plurality of comparison scales in the imaging scale is received from the input interface, and the separation at the predetermined interval Identifying the correspondence between each of the comparison scale values and the shooting scale values, From the scale readings by the comparative scale of the meter that is recognized from the captured image, the minimum by the comparative scale at a constant interval in which the Ru contains scale readings of said separated by a plurality of comparative scale interval A value is subtracted, and the processing result value is divided by a change amount of the value by the comparison scale in the predetermined section in which the scale instruction value is included, and a ratio of the scale instruction value in the predetermined section is calculated. The step of calculating and multiplying the amount of change in the value by the shooting scale in the predetermined section by the ratio, and adding the minimum value by the shooting scale in the predetermined section to this processing result value Calculating an indication value and outputting it to an output interface.

  In addition, the problems disclosed by the present application and the solutions thereof will be clarified by the embodiments of the present invention and the drawings.

  According to the present invention, it is possible to reliably and efficiently recognize an instruction value corresponding to various situations depending on a meter type or the like.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an overall configuration diagram including a meter recognition system 100 according to the present embodiment. In the present embodiment, for example, an instruction value of a needle-type or bar-type power accumulator (meter 200) installed in a customer's facility is photographed by photographing means 150 such as a digital camera, and the instruction value is based on the photographed image. Assuming a situation where However, the application of the present invention is not limited to this embodiment, and can be applied to any situation in which indication values for various meters related to various measurement objects such as gas and water are recognized.

  A meter recognition system 100 (hereinafter, system 100) of the present invention reads a program 102 stored in a program database 101 such as a rewritable memory into a memory 103 to perform a calculation to realize a function for executing the meter recognition method of the present invention. It is executed by the CPU 104 as the apparatus.

  In addition, the system 100 includes various keyboards and buttons generally provided in a computer device, an input / output interface 105 such as a display, and a communication unit 106 that performs data exchange with the photographing unit 150 and the like. Yes.

  The system 100 is connected to the photographing unit 150 and the like via the network 140 such as the Internet, a LAN, or a serial interface communication line by the communication unit 106, and executes data exchange. Of course, not only data transmission / reception via the network 140 but also data transmission / reception may be performed by processing such as reading a portable storage medium included in the photographing unit 150 on the system 100 side. Between the various functional units of the system 100 and the communication means 106, the I / O unit 107 executes data buffering and various mediation processes.

  Subsequently, functional units that are configured and held by the system 100 based on the program 102 will be described. For example, the system 100 obtains a photographed image of the scale indication of the meter 200 from the photographing unit 150 and displays it on the output interface, and the recognition area in the photographed image and the minimum value indicated by the photographing scale in the recognition area and An area setting unit 110 that accepts designation of the maximum value from the input interface is provided.

  In addition, the system 100 displays a plurality of comparative graduations with the minimum / maximum values at both ends of the graduation and dividing the minimum / maximum values at a predetermined interval on the output interface, overlaid on the recognition area. Graduation difference identification that accepts input of corresponding values of the plurality of comparison graduations from the input interface and identifies the correspondence between the values of the respective graduation for comparison and the values of the imaging graduations Part 111 is provided.

The system 100, the more the scale readings by comparison scale of the meter 200 to be recognized from the captured image, where a constant interval in which the Ru contains scale indicated value of the interval delimited by the plurality of comparative scale the subtraction processing the minimum value according to the comparative scale, the processing result value, by dividing the amount of change in value due to the comparative scale at the predetermined interval that includes the scale indicated value, the scale indicated value A ratio calculating unit 112 that calculates a ratio occupied in the predetermined section is provided.

Further, the system 100 multiplies the ratio by the amount of change of the value by the shooting scale in the predetermined section, and adds the minimum value by the shooting scale in the predetermined section to the processing result value. A conversion instruction value calculation unit 113 is provided that calculates the conversion instruction value and outputs it to the output interface.

  Note that each of the functional units 110 to 113 in the meter recognition system 100 described so far may be realized as hardware, or as a program stored in an appropriate storage device such as a memory or an HDD (Hard Disk Drive). It is good. In this case, the CPU 104 reads the corresponding program from the storage device into the memory 103 and executes it in accordance with the execution of the program.

  In addition to the Internet and LAN, the network 140 includes various types such as an ATM line, a dedicated line, a WAN (Wide Area Network), a power line network, a wireless network, a public line network, a mobile phone network, and a serial interface communication line. A network can also be adopted. If a virtual private network technology such as VPN (Virtual Private Network) is used, communication with improved security is established when the Internet is adopted. The serial interface refers to an interface for connecting to an external device by serial transmission that sequentially transmits data bit by bit using a single signal line, and RS-232C, RS-422, IrDA, USB, IEEE 1394, fiber channel, etc. can be assumed.

  Further, the photographing means 150 in the present embodiment can be assumed to be a fixed camera installed toward the instruction unit of the meter 200 or a camera carried by an inspector for photographing. This camera can be a digital camera, for example. Moreover, as a camera sensor of a digital camera, CCD, CMOS, etc. can be assumed, However, A digital camera provided with any camera sensor may be sufficient.

--- Processing flow example ---
Hereinafter, the actual procedure of the meter recognition method in the present embodiment will be described with reference to the drawings. Various operations corresponding to the meter recognition method described below are realized by the program 102 that the meter recognition system 100 reads into the memory 103 and executes. And this program 102 is comprised from the code | cord | chord for performing the various operation | movement demonstrated below.

  Here, it is assumed that the system 100 has previously acquired a captured image of the scale instruction in the meter 200 from the imaging unit 150 that has captured the indication unit of the meter 200 (s1000). At this time, the system 100 displays the captured image on an appropriate output interface such as a display (s1001). An example of the display screen at this time is shown in FIGS. A screen 1000 shown in FIG. 3A shows a situation assuming a meter such as a mercury column thermometer in which the meter indication value is a bar shape as an example. In addition, the screen 1010 shown in FIG. 3B shows a situation assuming a meter such as a thermometer in which the meter indication value is a needle type as an example.

  The system 100 that has performed such screen display then accepts designation of the recognition area in the photographed image and the minimum and maximum values indicated by the photographing scale in the recognition area from the input interface (s1002). In the screen 1000, as an example, it can be seen that a scale display corresponding to a temperature range of at least “−30 ° C. to 50 ° C.” is set in the meter 200. Therefore, the recognition area 1001 corresponding to the screen 1000 is, for example, a mouse or the like of the system 100 with respect to an image range including a scale display of “−30 ° C. to 50 ° C.” (eg, according to coordinate values on the image) ( Accept drag specification by (input interface).

  In addition, the specification of the minimum value and the maximum value indicated by the imaging scale in the recognition area 1001 corresponding to the screen 1000 is, for example, the keyboard of the system 100 corresponding to the scale display of “−30 ° C. to 50 ° C.” described above. The designation is accepted as “−30 ° C. to 50 ° C.” by the key-in processing using the input interface.

  Alternatively, as shown in the screen 1010, for the meter 200 in which a scale display is arranged on an arc, the recognition area 1001 is related to an image range including a scale display of “−30 ° C. to 50 ° C.”, for example. , Click designation on the scale display corresponding to the end of the arc (−30 ° C. and 50 ° C. each scale display) by the mouse of the system 100 (input interface), click designation on the center of rotation of the pointer, and arc thickness (eg: Accepts the click designation of the length of the scale line). As a result, an arc band having a thickness centered on a certain center line can be designated as the recognition area 1001. The specification of the minimum value and the maximum value indicated by the imaging scale in the recognition area 1001 is the same as that on the screen 1000. For example, the system 100 corresponds to the scale display of “-30 ° C. to 50 ° C.” described above. The designation is accepted as “−30 ° C. to 50 ° C.” by the key-in process using the keyboard (input interface).

  Subsequently, the system 100 displays a plurality of comparative scales 1002 with the minimum / maximum values at both ends of the scale and dividing the minimum / maximum values at predetermined intervals, overlaid on the recognition area 1001 (s1003). For example, the person in charge of processing who has viewed this display inputs the corresponding values of the plurality of comparative scales 1002 on the photographing scale. In the example of FIG. 3A, with respect to “−30 ° C. to 50 ° C.” serving as the recognition area, nine comparative scales 1002 are arranged at equal intervals from −30 ° C. to 50 ° C. Yes. However, the numerical values indicated by the comparative scale 1002 and the scale in the photographed image do not necessarily match. Therefore, for example, on the screen 1020 shown in FIG. 3C, an input indicating which value each comparative scale 1002 indicates on the scale in each captured image is accepted (s1004), and the system 100 identifies the correspondence between the two. is there. That is, the system 100 specifies the correspondence between the value of each of the comparison scales 1002 that becomes the predetermined interval and the value of the imaging scale (s1005).

Next, the system 100 subtracts the minimum value on the comparison scale in the predetermined section including the scale instruction value from the scale instruction value on the comparison scale of the meter 200 recognized from the captured image (s1006). ), And dividing the processing result value by the amount of change in the value by the comparison scale in the predetermined section including the scale instruction value, the ratio of the scale instruction value in the predetermined section is calculated (s1007). ).

  For example, it is assumed that the scale indication value of the meter 200 recognized without considering the correspondence is “17”. In this case, the predetermined section is “10 to 20”. At this time, in the correspondence, the scale value “12” in the captured image with respect to the value “10: minimum value” of the comparative scale 1002 and the scale 1002 for comparison with respect to the value “20: maximum value” of the comparative scale 1002 It is assumed that the scale value “22” in the photographed image of FIG. Further, the scale display is assumed to be equally spaced. At this time, the “ratio” is (17−10) / (20−10) = 0.7.

Further, the system 100 multiplies the ratio by the amount of change of the value by the shooting scale in the predetermined section, and adds the minimum value by the shooting scale in the predetermined section to the processing result value. A conversion instruction value is calculated (s1008). The “conversion instruction value” in the above example is (22−12) × 0.7 + 12 = 19.

  The system 100 performs the calculation process of the conversion instruction value for each instruction value of the scale display included in the recognition area, and outputs these on the output interface as shown in the screen 1610 of FIG. 4, for example (s1009), and ends the process. To do. On the screen 1610, the conversion instruction value (“display value” in the figure) is displayed numerically together with the image (original image) of the recognition area shown in FIG. 3 and the image displayed with the scale 1002 for comparison superimposed thereon. Is done.

  As another embodiment, when the pointer shape or bar-shaped scale indication form of the meter 200 is narrower than a predetermined reference, the scale display image is expanded to perform the scale display value specifying process. The occurrence of a specific difficult event due to an image being interrupted may be suppressed. Conversely, if the indicator shape or bar-shaped scale indication form of the meter 200 is thicker than a predetermined reference, the scale display image is reduced by performing a process of reducing the scale display image. It is also possible to suppress the occurrence of a specific difficult event due to overlapping with surrounding recognition areas.

  In addition, when accepting the designation of the recognition area, it also accepts angle information that the recognition area is deviated from horizontal or vertical, thereby leveling or leveling the scale display image included in the recognition area, It is possible to suppress the occurrence of a difficult-to-specify event due to distortion of the scale display image during the specified value specifying process.

  According to the present invention, it is possible to reliably and efficiently recognize an instruction value corresponding to various situations depending on a meter type or the like.

  As mentioned above, although embodiment of this invention was described concretely based on the embodiment, it is not limited to this and can be variously changed in the range which does not deviate from the summary.

It is a whole lineblock diagram including the meter recognition system in this embodiment. It is a flowchart which shows process sequence example 1 of the meter recognition method in this embodiment. It is a figure which shows the example 1 of a screen in this embodiment. It is a figure which shows the example 2 of a screen in this embodiment.

Explanation of symbols

100 Meter recognition system 101 Program database 102 Program 103 Memory 104 CPU
105 I / O interface 106 Communication means 107 I / O section 110 Area setting section 111 Scale difference identification section 112 Ratio calculation section 113 Conversion instruction value calculation section 140 Network 150 Imaging means 200 Meter

Claims (3)

A system for recognizing the scale indication of a needle-type or bar-type meter,
An area setting unit that displays a photographed image of the scale instruction on an output interface, and accepts designation of a recognition area in the photographed image and a minimum value and a maximum value indicated by the photographing scale in the recognition area from an input interface;
A plurality of comparison graduations with the minimum / maximum values at both ends of the graduation and separating the minimum / maximum values at a predetermined interval are displayed on the output interface so as to overlap the recognition area, and the plurality of comparison graduations on the imaging graduation A scale difference identifying unit that accepts an input of each corresponding value from the input interface and identifies a correspondence relationship between the value of each of the comparison graduations and the value of the imaging graduation serving as the predetermined interval,
From the scale readings by the comparative scale of the meter that is recognized from the captured image, by the comparative scale at a constant interval in which the Ru contains scale readings of said separated by a plurality of comparative scale interval The minimum value is subtracted, and the processing result value is divided by the amount of change in the value by the comparison scale in the predetermined section in which the scale instruction value is included, and the ratio of the scale instruction value in the predetermined section A ratio calculation unit for calculating
The conversion instruction value is calculated by multiplying the amount of change in the value by the shooting scale in the predetermined section by the ratio, and adding the minimum value by the shooting scale in the predetermined section to the processing result value. A conversion instruction value calculation unit for outputting to the output interface;
A meter recognition system comprising: A method for recognizing the scale indication of a needle-type or bar-type meter,
The photographed image of the scale instruction is displayed on the output interface, and the designation of the recognition area in the photographed image and the minimum value and the maximum value indicated by the photographing scale in the recognition area is received from the input interface,
A plurality of comparison graduations with the minimum / maximum values at both ends of the graduation and separating the minimum / maximum values at a predetermined interval are displayed on the output interface so as to overlap the recognition area, and the plurality of comparison graduations on the imaging graduation Each corresponding value input is received from the input interface, the correspondence between the value of each of the comparison graduations and the value of the imaging graduation that becomes the separation of the predetermined interval is specified,
From the scale readings by the comparative scale of the meter that is recognized from the captured image, by the comparative scale at a constant interval in which the Ru contains scale readings of said separated by a plurality of comparative scale interval The minimum value is subtracted, and the processing result value is divided by the amount of change in the value by the comparison scale in the predetermined section in which the scale instruction value is included, and the ratio of the scale instruction value in the predetermined section To calculate
The conversion instruction value is calculated by multiplying the amount of change in the value by the shooting scale in the predetermined section by the ratio, and adding the minimum value by the shooting scale in the predetermined section to the processing result value. , Output to an output interface, and a meter recognition method. A program for causing a computer to execute a method for recognizing a scale indication of a needle-type or bar-type meter,
Displaying the scaled captured image on an output interface and receiving from the input interface designation of the recognition area in the captured image and the minimum and maximum values indicated by the imaging scale in the recognition area;
A plurality of comparison graduations with the minimum / maximum values at both ends of the graduation and separating the minimum / maximum values at a predetermined interval are displayed on the output interface so as to overlap the recognition area, and the plurality of comparison graduations on the imaging graduation Receiving the input of each of the corresponding values from the input interface, and specifying a correspondence relationship between the value of each of the comparison graduations and the value of the imaging graduation serving as the predetermined interval,
From the scale readings by the comparative scale of the meter that is recognized from the captured image, by the comparative scale at a constant interval in which the Ru contains scale readings of said separated by a plurality of comparative scale interval The minimum value is subtracted, and the processing result value is divided by the amount of change in the value by the comparison scale in the predetermined section in which the scale instruction value is included, and the ratio of the scale instruction value in the predetermined section A step of calculating
The conversion instruction value is calculated by multiplying the amount of change in the value by the shooting scale in the predetermined section by the ratio, and adding the minimum value by the shooting scale in the predetermined section to the processing result value. Outputting to the output interface;
A meter recognition program comprising: