JP6397650B2 - Displacement detection device and information display device - Google Patents

Description

  The present invention relates to a displacement detection device that detects the displacement of a structure.

  Japanese Patent Application Laid-Open No. 2004-133826 describes an image capturing unit that acquires a road state captured at a predetermined period, a detection region setting unit that sets an abnormality detection region for detecting an abnormality of a structure on the road, There is disclosed a road structure abnormality detection device comprising image abnormality processing for an abnormality detection region and a structure abnormality detection means for detecting an abnormality of the structure on the road.

JP 2009-266136 A

  In the safety management of a structure, it is important to quickly detect the damage of the structure and to prevent the damage. For this reason, it is required to detect a slight abnormality in the process leading to breakage of the structure.

  The abnormality detection device disclosed in Patent Document 1 detects damage to a structure based on an image obtained by imaging the structure from a distant position. For this reason, in the abnormality detection device disclosed in Patent Document 1, damage to the structure can be detected, but it is difficult to detect a slight abnormality in the process of causing the structure to break.

  In order to detect a slight abnormality of the structure, it is conceivable to attach a sensor such as a displacement sensor to the structure and measure the displacement of the structure. However, when the sensor is attached to the structure, the sensor itself and its peripheral equipment are required, and the apparatus may be increased in size and complexity.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a displacement detection device capable of detecting a slight displacement of a structure with a simple configuration.

The present invention relates to a displacement detecting device for detecting a displacement of the signboard displaying information, and level provided in the signboard, and capable of capturing the image pickup unit of the spirit level is provided on the billboard, the imaging unit between the determined image captured in an image processing unit for extracting an indication of the level gauge, a display of the level gauge which displays the image processing section of the spirit level is extracted to be included in the reference image as a reference of determination A change determination unit that calculates a display position change amount , and a notification unit that notifies information obtained from the display position change amount calculated by the change determination unit.

  In the present invention, the level and the imaging unit are provided in the structure, and the imaging unit detects the displacement based on the image obtained by imaging the level. Since the display of the spirit level is changed even by a slight displacement of the structure, the slight displacement of the structure can be detected by determining the change in the display of the spirit level in the captured image. In addition, the imaging unit only needs to be able to image the level, and since it is not necessary to image the entire structure, a small-sized one can be used. Further, it is not necessary to provide sensors for detecting the displacement. For this reason, an increase in size and complexity of the displacement detection device can be prevented. Thus, according to the present invention, a slight displacement of the structure can be detected with a simple configuration.

It is a figure which shows an information display apparatus provided with the displacement detection apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of the displacement detection apparatus which concerns on embodiment of this invention. It is a block diagram which shows the structure of the displacement detection apparatus which concerns on embodiment of this invention. It is a flowchart figure which shows the procedure of the absolute comparison control of the displacement detection apparatus which concerns on embodiment of this invention. It is a flowchart figure which shows the procedure of the relative comparison control of the displacement detection apparatus which concerns on embodiment of this invention.

  Hereinafter, a displacement detection apparatus 100 according to an embodiment of the present invention will be described with reference to the drawings.

  First, the configuration of the displacement detection device 100 will be described with reference to FIGS.

  As shown in FIG. 1, the displacement detection device 100 detects the displacement of the information display device 1 as a structure having a sign 2 as a display unit for displaying information and a column 3 that supports the sign 2. The displacement detection device 100 is not limited to the information display device 1 and may be a device that detects the displacement of other structures.

  As shown in FIGS. 1 and 2, the displacement detection device 100 captures an image of the housing 10 fixed to the upper part of the signboard 2 in the information display device 1, a level 11 provided in the housing 10, and the level 11. A camera 12 serving as an imaging unit that can be provided in the housing 10 and a controller 20 that detects a displacement by processing an image captured by the camera 12 are provided. The housing 10 in which the level 11 and the camera 12 are provided may be fixed to the inside of the signboard 2 or the column 3.

  The level 11 is a bubble tube level having a bubble tube 11A in which liquid and bubbles are enclosed. As the level 11 is inclined from the horizontal state, the bubbles move in the bubble tube 11A, and the inclination from the horizontal can be confirmed by the position of the bubbles. Thus, the level 11 may be anything that can confirm a change in inclination visually.

  The camera 12 images the level 11 based on a command from the controller 20. An image captured by the camera 12 is transmitted to the controller 20. Since the camera 12 only needs to be able to image the level 11, a small and inexpensive camera can be used.

  The controller 20 includes a microcomputer having a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), and I / O interface (input / output interface). The RAM stores data in the processing of the CPU, the ROM stores a control program of the CPU in advance, and the I / O interface is used for input / output of information with the connected device.

  As shown in FIG. 3, the controller 20 includes an image processing unit 21 that performs image processing for extracting the display of the level 11 from the determination image captured by the camera 12, and the level 11 based on the processing result of the image processing unit 21. Information obtained from the determination result of the change determination unit 22, the abnormality determination unit 23 that determines abnormality of the information display device 1 based on the determination result of the change determination unit 22, and the determination result of the change determination unit 22 And an information storage unit 25 for storing image data and determination results.

  The image processing unit 21 performs image processing for extracting the display of the level 11, that is, the position of the bubble in the liquid in the bubble tube 11 A, from the determination image captured by the camera 12.

  The change determination unit 22 compares the display of the level 11 included in the reference image serving as a determination reference with the display of the level 11 included in the determination image captured by the camera 12 to change the display of the level 11. judge. Specifically, the change determination unit 22 calculates the change amount of the display of the level 11 in the two images.

  The abnormality determination unit 23 determines whether or not an abnormality has occurred in the information display device 1 based on the display change amount of the level 11 calculated by the change determination unit 22. Specifically, it is determined whether the display change amount of the level 11 is equal to or greater than a preset threshold value. If the change amount is equal to or greater than the threshold value, it is determined that the displacement amount of the information display device 1 is abnormal. Output an abnormal signal. The threshold value can be arbitrarily set so that the normal state and the abnormal state of the information display device 1 can be determined based on the size of the information display device 1, the installation location, a displacement detection control method described later, and the like.

  The notification unit 24 notifies the occurrence of an abnormality in the information display device 1 determined by the abnormality determination unit 23 based on the determination result of the change determination unit 22 to, for example, a control room that manages the safety of the information display device 1. .

  The information storage unit 25 stores information such as the reference image and the change amount of the display on the level 11. The information storage unit 25 stores and retrieves information based on the command.

  Such a controller 20 can use a small microcomputer (for example, a PIC microcomputer). When a small microcomputer is used, the controller 20 can be provided in the housing 10. When the controller 20 is not provided in the housing 10, a transmission unit (not shown) that transmits an image captured by the camera 12 to the controller 20 may be provided. The transmission unit transmits the captured image by wired or wireless communication means.

  Next, the displacement detection control of the displacement detection device 100 that detects the displacement of the information display device 1 will be described with reference to FIGS.

  As the displacement detection control, the displacement detection device 100 includes a display of the level 11 in an initial state in which the level 11 in the displacement detection device 100 is attached to the information display device 1 and a display of the level 11 in an image captured by the camera 12. And an absolute comparison control for comparing the display of the level 11 between an image captured by the camera 12 and an image captured by the camera 12 thereafter.

  In the absolute comparison control, the controller 20 executes the processing of steps 101 to 106 shown in FIG. 4 at a predetermined calculation cycle.

  In step 101, the camera 12 acquires a determination image obtained by capturing the level 11. At this time, the camera 12 may capture a still image, or may extract one frame from the moving image as a still image.

  In step 102, the display of the level 11 is extracted from the determination image acquired in step 101. Specifically, the position of the bubble of the level 11 in the determination image is extracted.

  In step 103, the display of the level 11 in the reference image stored in advance in the information storage unit 25 is read. Specifically, the position of the bubble of the level 11 in the reference image is read.

  In step 104, the amount of change in the display of the level 11 between the display of the level 11 in the determination image extracted in step 102 and the display of the level 11 in the reference image read in step 103 is calculated. Specifically, the amount of change between the position of the bubble of the level 11 in the determination image and the position of the bubble of the level 11 in the reference image is calculated.

  In step 105, it is determined whether or not the amount of change in display on the level 11 calculated in step 104 is equal to or greater than a preset threshold value. Hereinafter, the threshold value used in the absolute comparison control is referred to as “first threshold value”. If the amount of change in display on the level 11 is equal to or greater than the first threshold, it is determined that the amount of displacement of the information display device 1 is abnormal, and the process proceeds to step 106. When the change amount of the display on the level 11 is smaller than the first threshold value, it is determined that there is no abnormality in the information display device 1 and the process ends.

  In step 106, the notification unit 24 notifies the information display device 1 that an abnormality has occurred and ends the process. The notification unit 24 notifies the abnormality of the information display device 1 by displaying an abnormality alarm on a display monitor such as a control room or by sounding an alarm sound around the information display device 1 or the control room.

  As described above, in the absolute comparison control, a change in the display of the level 11 from the state in which the displacement detection device 100 is attached to the information display device 1, that is, the normal state in which no abnormality has occurred is determined.

  Next, the relative comparison control will be described with reference to FIG.

  In the relative comparison control, the controller 20 executes steps 201 to 207 shown in FIG. 5 at a predetermined calculation cycle.

  Steps 201 to 204 are the same processes as steps 101 to 104 in the absolute comparison control, and thus description thereof is omitted.

  In step 205, it is determined whether or not the change amount of the display on the level 11 calculated in step 204 is equal to or greater than a preset threshold value. Hereinafter, the threshold used in the relative comparison control is referred to as a “second threshold”. If the display change amount of the level 11 is equal to or greater than the second threshold value, it is determined that the information display device 1 is displaced and an abnormality has occurred, and the process proceeds to step 206. When the change amount of the display on the level 11 is smaller than the second threshold value, it is determined that the information display device 1 has no abnormality, and the process proceeds to Step 207.

  In step 206, as in step 106 in the absolute comparison control, the notification unit 24 notifies the information display device 1 that an abnormality has occurred and ends the process.

  In step 207, the reference image stored in the information storage unit 25 is changed to the determination image captured in step 201, and the process ends. By changing the determination image for which determination has been completed to a new reference image and repeating the relative comparison control, it is possible to determine a change in the display of the level 11 in the two images that are successively captured. As described above, in the relative comparison control, among the images continuously captured by the camera 12, the first captured image is used as a reference image, and the later captured image is used as a determination image. Determine.

  According to such relative comparison control, an abnormality of the information display device 1 can be determined without taking an image of the level 11 in the initial state which is a normal state as in the absolute comparison control.

  When the relative comparison control is executed for the first time, the level 11 may be imaged before the relative comparison control is executed, and the captured image may be used as a reference image. Similarly to the absolute comparison control, the level 11 in the initial state in which the level 11 of the displacement detection device 100 is attached to the information display device 1 is imaged, and an image obtained by capturing the initial state of the level 11 is a reference image. It is good.

  In the relative comparison control, the images to be compared do not have to be taken continuously. For example, the reference image may be updated after the relative comparison control is executed a plurality of times.

  As described above, the displacement detection device 100 can detect the displacement of the information display device 1 by performing absolute comparison control and relative comparison control. The displacement detection device 100 can arbitrarily select whether to perform absolute comparison control or relative comparison control based on the installation location of the information display device 1 or the like. Moreover, the absolute comparison control and the relative comparison control may be performed simultaneously to improve the accuracy of displacement detection.

  In the displacement detection device 100, the level 11 is provided in the housing 10 attached to the information display device 1, so that the display of the level 11 changes even if the information display device 1 is slightly displaced. To do. Therefore, according to the displacement detection device 100, whether or not the information display device 1 is slightly displaced is determined by determining a change between the determination image obtained by capturing the level 11 with the camera 12 provided in the housing 10 and the reference image. Can be determined.

  Further, in the displacement detection device 100, the change amount calculated by the change determination unit 22 may be stored in the information storage unit 25, and the abnormality of the information display device 1 may be determined based on the history of the calculated change amount. . For example, when performing relative comparison control, the abnormality determination unit 23 reads a plurality of changes calculated most recently from the information storage unit 25 and determines whether or not the average of these is equal to or greater than a threshold value. Also good.

  In the relative comparison control, based on the history of the calculated change amount, the displacement amount from the initial state in which the level 11 of the displacement detection device 100 is attached to the information display device 1 is calculated, and based on the calculation result, An abnormality in the information display device 1 may be determined.

  Moreover, the microcomputer as the controller 20 can use a small microcomputer. By using a small microcomputer, the displacement detection device 100 can be manufactured more compactly and inexpensively.

  According to the above embodiment, there exist the following effects.

  In the displacement detection device 100, a level 11 and a camera 12 are provided in the information display device 1, and the camera 12 detects a displacement based on an image obtained by capturing the level 11. Since the display of the level 11 changes even when the information display device 1 is slightly displaced, the slight change of the information display device 1 is detected by determining the change in the display of the level 11 in the captured image. Can do. The camera 12 only needs to be able to image the level 11 and does not need to image the entire information display device 1, so a small camera can be used. Further, it is not necessary to provide sensors for detecting the displacement. For this reason, the displacement detection apparatus 100 can be prevented from becoming large and complicated. Thus, according to the displacement detection apparatus 100, a slight displacement of the information display apparatus 1 can be detected with a simple configuration.

  Moreover, in the displacement detection apparatus 100, the camera 12 is provided in the information display apparatus 1 which is the object which detects a displacement, and images the level 11 provided in the information display apparatus 1 instead of the information display apparatus 1 itself. For this reason, compared with the case where the camera 12 is installed at a location distant from the information display device 1 and the information display device 1 itself is imaged, there is nothing to block the imaging of the camera 12, so that the accuracy of displacement detection is improved. be able to.

  Further, the displacement detection device 100 determines whether or not the information display device 1 is displaced from the change in the image of the level 11, and does not calculate the tilt amount or the displacement amount of the information display device 1 itself. Absent. Therefore, since the displacement detection apparatus 100 does not require a lot of processing and calculation, a small microcomputer can be used as the controller 20, and the size can be further reduced.

  In the embodiment described above, the abnormality determination unit 23 determines whether or not the display change amount in the level 11 calculated by the change determination unit 22 is higher than a threshold value. It is determined that there is an abnormality that causes displacement. On the other hand, in the displacement detection device 100, the change determination unit 22 determines whether or not there is a change in the display of the level 11, and when there is a change in the display regardless of the change in the display of the level 11, You may determine with the information display apparatus 1 having abnormality. In other words, the displacement detection device 100 may perform displacement detection by setting the first threshold value or the second threshold value to zero.

  Moreover, in the said embodiment, when it determines with there being no abnormality in the information display apparatus 1, nothing is alert | reported, and only when it determines with there being abnormality, the alerting | reporting part 24 alert | reports abnormality. On the other hand, the alerting | reporting part 24 may alert | report that there is no abnormality in the information display apparatus 1. FIG.

  Moreover, in the said embodiment, the alerting | reporting part 24 alert | reports the determination result of the abnormality determination part 23 which determined whether abnormality has arisen in the information display apparatus 1. FIG. On the other hand, the notification unit 24 may notify the change amount of the level 11 calculated by the change determination unit 22, in other words, the determination result itself of the change determination unit 22. In this case, an operator such as a control room can determine whether or not the information display device 1 is in an abnormal state based on the notified determination result of the change determination unit 22. Thus, the notification unit 24 only needs to notify the information obtained from the determination result of the change determination unit 22.

  In addition, in the case where a vertical displacement occurs in the information display device 1, an acceleration sensor may be provided in addition to the displacement detection device 100.

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

1 Information display device 2 Signboard (display unit)
3 Prop 100 Displacement detector
11 Level 12 Camera (imaging part)
20 controller 21 image processing unit 22 change determination unit 23 abnormality determination unit 24 notification unit 25 information storage unit

Claims (5)

A displacement detection device for detecting the displacement of a signboard displaying information ,
A spirit level provided on the signboard ;
An imaging unit provided on the signboard and capable of imaging the spirit level;
An image processing unit that extracts the display of the level from the determination image captured by the imaging unit;
A change determination unit that calculates a position change amount of display between the display of the level included in the reference image serving as a determination reference and the display of the level extracted by the image processing unit;
A displacement detection device comprising: a notification unit that notifies information obtained from the position change amount of the display calculated by the change determination unit. An abnormality determination unit that determines an abnormality of the signboard based on a determination result of the change determination unit;
The abnormality determining unit determines that an abnormality has occurred in the sign if the display position change amount calculated by the change determining unit is equal to or greater than a threshold value.
The displacement detection device according to claim 1, wherein the notification unit notifies a determination result of the abnormality determination unit. The change determination unit, of the image captured by the imaging unit, the image captured earlier by the reference image, the captured image as the determination image after the change in position of the display of the Level The displacement detection device according to claim 1, wherein a displacement of the signboard is detected by determining whether or not The change determination unit displacement according to the spirit level to any one of claims 1 3, characterized in that image and the reference image obtained by imaging the spirit level in the initial state attached to the signboard Detection device.   The displacement detection device according to any one of claims 1 to 4,
  An information display device comprising: the signboard as a display unit for displaying information.

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