JP2010269884A - Escalator step abnormality detection method and apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and device for detecting abnormality of a step of an escalator detecting a stereoscopic abnormality of the step. <P>SOLUTION: In the method and device for detecting abnormality of the step, the images obtained by photographing a normal standard step at a predetermined position from two different angles are stored as a first and a second standard image respectively. The images of the step obtained by photographing the step, the abnormality of which is to be detected, at a predetermined position from the same two angles, are generated as a first and a second photographed image respectively. Based on the difference obtained by comparing these the first and the second standard image and the first and the second photographed image, presence or absence of the stereoscopic abnormality of the step is determined. Abnormality such as dirtiness and breakage of the step can be detected. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an escalator step abnormality detection method and apparatus, and more particularly to an escalator step abnormality detection method and apparatus capable of detecting an abnormality such as contamination and breakage by monitoring the escalator step.

  When an escalator having a broken step is operated, foreign matter on the step may be caught between the broken portions, and thus an escalator step breakage detecting device for detecting such breakage has been proposed.

  In this escalator step breakage detection device, a television camera that captures a plurality of moving steps is arranged in the lower truss, and the control device outputs a television signal based on the output from the optical sensor for each moving step. An image processing signal is transmitted to the image converter so as to convert the image of the step taken by the television camera into an electric signal. The image signal processed in this way is sent to the control board via the I / O board, and the captured image of each step is compared with the image of the normal step stored in advance to check whether each step is damaged. The determined and damaged step is displayed on the display device (see, for example, Patent Document 1).

JP-A-8-169679

  In such a conventional apparatus, although abnormalities such as step contamination and breakage can be detected, three-dimensional abnormalities such as contamination (planar abnormalities such as step contamination) and breakage (a part of the step is missing, etc.) ) Is difficult to distinguish, and improvement is desired for use as a safety device.

  Accordingly, an object of the present invention is to provide an escalator step abnormality detecting method and apparatus capable of detecting a three-dimensional abnormality such as a broken or missing part of a step.

  In the escalator step abnormality detection method according to the present invention, in order to detect an escalator step abnormality, a first predetermined value relative to the reference step when the normal reference step of the escalator is at a predetermined position in the step circulation path is provided. A first image of the reference step taken from an angle and a second image of the reference step taken from a second predetermined angle different from the first predetermined angle are generated as a first reference image and a second reference image, respectively. A first image of the step taken from the first predetermined angle with respect to the step when the step of storing and the step of detecting an abnormality circulating in the step circulation path of the escalator is at the predetermined position; And the second image of the step photographed from the second predetermined angle are respectively the first photographed image and the second photographed image. And at least three of the first reference image, the second reference image, the first photographed image, and the second photographed image, and the step based on the difference between the images. A step abnormality detecting method for an escalator comprising the step of determining whether or not there is a three-dimensional abnormality.

  Further, the escalator step abnormality detection device of the present invention includes a detection device for detecting that the escalator step is at a predetermined position in the circulation path, and the above steps are known normal in order to detect an escalator step abnormality. When the reference step is a reference step, the first reference image at the predetermined position is photographed from a first predetermined angle and a second predetermined angle different from the first predetermined angle with respect to the reference step. And the second reference image is generated, and when the step is a step for detecting an abnormality, the step at the predetermined position is photographed from the first predetermined angle and the second predetermined angle with respect to this step. A photographing device for generating a first photographed image and a second photographed image, the first reference image, the second reference image, The storage device storing the first photographed image and the second photographed image is compared with at least three of the first reference image, the second reference image, the first photographed image, and the second photographed image. An escalator step abnormality detecting device comprising a comparison / determination device for determining the presence or absence of a three-dimensional abnormality in the above steps based on a difference between these images.

  According to the step abnormality detection method and apparatus for an escalator of the present invention, it is possible to detect an abnormality including not only step contamination but also damage such as damage or partial omission.

It is a block diagram which shows schematic structure of the step abnormality detection apparatus of the escalator of this invention. It is the schematic perspective view which looked at the machine room part of the inversion part of the escalator which provided the step abnormality detection apparatus of the escalator of this invention from diagonally upward. It is a schematic side view of the machine room part shown in FIG. FIG. 4 is a schematic sectional view taken along line AA in FIG. 3. It is the time chart which showed the relationship between time and a step position, time, and a sensor signal. It is a top view which shows the tread of a normal reference | standard step. It is a top view which shows the tread of the step with abnormality, such as pollution and damage. It is the image by the 1st camera of the normal reference step which can become a reference image. It is the image by the 2nd camera of the normal reference | standard step which can become a reference | standard image. It is the image by the 1st camera of a step with abnormalities, such as pollution and breakage. A second step in which there is an abnormality such as fouling or breakage is an image by a camera. It is an operation | movement flowchart of the step abnormality detection method of the escalator of this invention shown in FIG. It is an operation | movement flowchart of another step abnormality detection method of the escalator of this invention.

  Embodiments of an escalator step abnormality detection method and apparatus according to the present invention will be described below.

Embodiment 1 FIG.
FIG. 1 shows a schematic configuration of an embodiment of an escalator step abnormality detecting device according to the present invention, and FIGS. 2 to 4 show a relationship between the escalator step abnormality detecting device and the escalator. This escalator step abnormality detection device includes first and second cameras 3 and 4 which are photographing devices for photographing step 2 moving in the step circulation path 1 of the escalator.

  The first camera 3 shoots from a position having a first predetermined angle with the tread surface 5 of Step 2 biased in the width direction and generates an image thereof. The second camera 4 shoots the tread surface 5 of step 2 from a symmetrical position having a second predetermined angle that is biased in the width direction in the opposite direction to the first camera 3 and generates an image thereof. It is desirable that the angle between the first predetermined angle and the second predetermined angle is an appropriate angle for generating a three-dimensional image. The first and second cameras 3 and 4 are arranged in the reversing part where step 2 is reversed in the escalator machine room 6 and are attached to the truss 7.

  The two two-dimensional images of step 2 generated by the first and second cameras 3 and 4 are converted into a three-dimensional image by the image conversion device 8 and supplied to the comparison / determination device 10 through the input / output device 9 for comparison. It is stored in the main storage device 11 of the determination device 10. In addition to the main storage device 11, the comparison determination device 10 includes a central processing unit 12 for comparing images, which will be described later, and an auxiliary storage device 13 for storing a reference image serving as a reference for comparison. Yes.

  The three-dimensional images generated based on the images taken by the first and second cameras 3 and 4 that are the photographing devices are continuous images, and the image used for image comparison is step 2 in the circulation path 1 among them. An image obtained when the image is at a predetermined position is extracted. Whether or not step 2 is in a predetermined position is determined by knowing the position of step 2 by first and second detectors 14 and 15 that are attached to truss 7 in machine room 6 and detect step 2. Done. In the illustrated example, the first and second detectors 14 and 15 are configured by photocouplers arranged so that the light beam is blocked by Step 2, respectively.

  In the time chart of FIG. 5, FIG. 5 (a) shows the change with time of the distance from the first and second cameras 3 and 4 (imaging device) in step 2 moving in the reversing part of the circulation path 1, that is, The position of step 2 in the circulation path 1 is shown. FIG. 5B shows the signal S1 from the first detector 14 that changes depending on the presence or absence of step 2. FIG. 5C shows the presence or absence of step 2. The signal S2 from the 2nd detector 15 which changes by these is shown.

  In the first detector 14, the signal S1 falls from 1 to 0 at the detection time t16 immediately before the time T when the step 2 becomes a position suitable for photographing closest to the cameras 3 and 4, and the trailing edge 16 in the moving direction of the step 16 It is arrange | positioned in the position which detects. The second detector 15 is arranged on the downstream side in the moving direction of step 2 by a distance substantially equal to the depth of step 2 (dimension in the moving direction), and the signal S2 is detected at a detection time t17 immediately after time T. Rises from 0 to 1 and detects the leading edge 17 in the moving direction of step 2.

  Therefore, the first detector 14 detects the trailing edge 16 in the moving direction of a certain step 2, and the second detector 15 detects the leading edge 17 in the moving direction of the next step after the step 2, The fact that step 2 to be photographed has reached a predetermined position to be photographed is supplied to the central processing unit 12 of the comparison / determination device 10 via the input / output device 9 and the trailing edge 16 in the moving direction 16 based on the signals S1 and S2. Is determined with reference to a time T approximately in the middle between the detection time t16 and the detection time t17 of the leading edge 17 in the moving direction.

  The escalator step abnormality detection device shown in FIG. 1 further includes an escalator control panel 18 and a communication device 19 connected to the comparison / determination device 10 via the input / output device 9 for the purpose to be described later. Further, an illumination 20 for photographing Step 2 is provided in the machine room 6.

  In such an escalator step abnormality detection device, the first and second cameras 3 and 4 which are photographing devices photograph the step 2 that should be used as a reference as shown in FIG. 6 is extracted, and the image of step 2 at a predetermined position corresponding to time T is extracted, the 3D image of step 2 having no abnormality in FIG. The image P1 of FIG. 8 is obtained, and according to the second camera 4, the image P2 of FIG. 9 is obtained. Further, the three-dimensional image in Step 2 with the contamination 21 and the damage 22 in FIG. 7 becomes the image P3 in FIG. 10 according to the first camera 3, and the image P4 in FIG. 11 becomes the image by the second camera 4. . In particular, in the images P3 and P4 of FIGS. 10 and 11, the inner peripheral wall 23 of the breakage 22 having a three-dimensional shape that does not clearly appear in the images P1 and P2 appears. In the images P3 and P4, the left and right sides of the breakage 22 appear.

  In performing abnormality detection using such an escalator step abnormality detection device, each step is performed according to the flowchart shown in FIG. That is, as a preliminary stage, after confirming that all steps 2 are normal steps without fouling or breakage, the first and second cameras 3 and 4 perform step 2 while operating the escalator (F01). The tread surface 5 is monitored and continuous shooting is performed (F02). The image obtained by the continuous shooting is converted into a three-dimensional image by the image conversion device 8 (F03), and among the many images, when Step 2 is at a predetermined position corresponding to time T in the step circulation path (F04, The image of “YES” corresponds to the images P1 and P2 shown in FIGS. 8 and 9, and this image is generated (F05) and stored in the main storage device 11 of the comparison determination device 10 in the form of three-dimensional image data. Only the tread surface 5 in step 2 is stored as the extracted first reference image R1 and second reference image R2 (F06).

  When step 2 is not at the predetermined position (F04, NO), this determination is repeated until the predetermined position is reached. As step 2 to be photographed, one representative step can be selected from a large number of steps 2 of the escalator. The stored images P1 and P2 are respectively used as a first reference image R1 and a second reference image R2 which are comparison references in a comparison step described later, and the first reference image R1 is always the image P1, The second reference image R2 is always the image P2.

  As described above, the steps from the escalator operation (F01) to the generation (F05) and storage (F06) of the reference image are the normal reference step 2 of the escalator at a predetermined position in the step circulation path 1 (corresponding to the time T). The images P1 and P2 of the reference step 2 taken from the first predetermined angle and the second predetermined angle different from the first predetermined angle with respect to the reference step 2 are respectively the first reference image R1 and the second reference image. This is a step of generating and storing as an image R2. The first reference image R1 generated and stored at this time is represented as R1 (x, y, z) by a general formula in which the coordinates of the comparison target in each image are vertical: Y, horizontal: X, and height: Z. be able to. The second reference image R2 can be represented as R2 (x, y, z).

  The processes up to the reference image creation and storage (F06) as a preliminary stage may be performed at the time of installing the escalator or may be performed before shipping at the factory. In addition, for example, an image created using two cameras arranged in the above-described predetermined position with respect to one step 2 before assembly can be used as a reference image. Further, for example, in the case of an escalator with a variable step for a wheelchair, a reference image for all the steps 2 is created and placed instead of creating only one reference image for the step 2 as a representative. May be good.

  After the first reference image R1 (corresponding to the image P1) and the second reference image R2 (corresponding to the image P2) are created and stored (F06) in this way, step abnormality detection is performed during operation of the escalator. Therefore, the same steps (F07 to F11) as the steps from the escalator operation (F01) to the reference image extraction (F05) as the preliminary stage described above are executed. However, Step 2 of the current step continuous photographing process (F08) is Step 2 as a detection target that may have the fouling 21 or the damage 22, and a predetermined position determination step (F10) and a step image extraction step (F11). The images of the tread surface 5 of step 2 extracted through () are not the reference images R1 and R2, but are captured images Q1 and Q2 representing the tread surface 5 of step 2 to be detected. The contents of the captured images Q1 and Q2 are obtained by extracting the tread 5 from images obtained by capturing the normal step 2 in FIG. 6 or the abnormal step 2 in FIG. 7 with the first and second cameras 3 and 4. Therefore, it can be any of the images P1 to P4 in FIGS.

  As described above, these steps (F07 to F11) are the first to the step 2 when the step 2 that is to be detected for abnormality that is circulating in the step circulation path 1 of the escalator is at a predetermined position corresponding to the time T. The images P1 and P2 or P3 and P4 of the tread surface 5 in step 2 taken from the first predetermined angle by the camera 3 and the second predetermined angle by the second camera 4 are respectively taken as the first photographed image Q1 and the second photographed image Q2. It can be said that this is a production process. The captured image Q1 generated at this time can be expressed as Q1 (x, y, z) by a general formula in which the coordinates of comparison targets in each image are vertical: Y, horizontal: X, and height: Z. The two captured images Q2 can be expressed as Q2 (x, y, z).

  The first captured image Q1 (P1 or P3) and the second captured image Q2 (P2 or P4) generated in this way are stored in the main storage device 11 by the central processing unit 12 of the comparison determination device 10. The second reference image (R1 and R2) is compared (F12) by the background difference method or the like. That is, using the expression R1 (x, y, z) of the first reference image R1 and the expression Q1 (x, y, z) of the first captured image Q1, the comparison result D = | R1 (x, y, z) ) −Q1 (x, y, z) |, it is determined that the images match and do not differ when D = 0, and when D ≠ 0, the images do not match and are determined to be different. (F13).

  For example, the first captured image Q1 is compared with the first reference image R1 (image P1), and the comparison result D = | Q1 (x, y, z) −R1 (x, y, z) | If the images match and there is no difference (F13, NO), it is determined that there is no abnormality in step 2, and the next step 2 is set at a predetermined position in order to detect abnormality in the subsequent step 2. The process proceeds before the determination step (F10). The same applies when comparing the second captured image Q2 and the second reference image R2. Even when only the first reference image R1 or the second reference image R2 from the first or second camera 3 or 4 is stored as the reference image, an appropriate comparison can be made by performing appropriate image processing. Further, when the first captured image Q1 corresponds to, for example, the image P3 shown in FIG. 10, the images do not match and it is determined that there is a difference because D ≠ 0 (F13, YES), it is determined that there is an abnormality in step 2 that is at least one of fouling 21 and breakage 22 (F14).

  Next, it is determined whether or not the abnormality is caused by damage (F15). In this determination, the first captured image Q1 obtained by the first camera 3 in step 2 and the second captured image Q2 obtained by the second camera 4 are obtained by the central processing unit 12 of the comparison / determination device 10 by the background difference method or the like. This is done depending on whether there is a difference when compared. For example, when the first photographed image Q1 corresponds to the image P3 in FIG. 10 and the second photographed image Q2 corresponds to the image P4 in FIG. 11, the first photographed image Q1 also includes the first photographed image Q1. 2 In the photographed image Q2, the stain 21 and the damage 22 are also drawn. When these images P3 and P4 are compared (F16) using, for example, a general image expression representing an image with the coordinates of the comparison target in each image being vertical: Y, horizontal: X, and height: Z, When D in the comparison result D = | Q1 (x, y, z) −Q2 (x, y, z) | is 0, the first captured image Q1 that is the image P3 and the second captured image that is the image P4. It is the same as Q2 and it is determined that there is no difference, and if the difference between the two equations is not 0, it is determined that there is a difference between the two images (F16, YES).

Alternatively, instead of the above-mentioned comparison, by determining the presence or absence of information on the coordinates of any image, that is, the following simultaneous equations are established, information exists only at the coordinates of any image, and D When it is determined that is not 0 (zero), it can be determined that there is damage.
D = | Q1 (x, y, z, T) −R1 (x, y, z) | and D ≠ 0
Q1 (x, y, z) ≠ 0 or R1 (x, y, z) ≠ 0

  In the step 2 for determining whether or not there is an abnormality, at least one of the comparison between the first captured image Q1 and the first reference image R2 and the comparison between the second captured image Q2 and the second reference image R2 is performed. Then, based on the result, the step (F13) of determining the presence / absence of an abnormality in step 2 and when the presence of the abnormality is determined, the first captured image Q1 and the second captured image Q2 are compared to determine the abnormality. It is possible to provide a step (F16) for determining whether or not is a three-dimensional abnormality.

  In addition, the comparison determination device 12 that determines the presence or absence of the abnormality described above generates an image conversion device 8 that generates a three-dimensional reference image from the first reference image R1 and the second reference image R2 in Step 2, and the first captured image Q1. The image conversion device 8 that generates a three-dimensional photographed image from the second photographed image Q2 and the three-dimensional reference images R1 and R2 thus produced and the three-dimensional photographed images Q1 and Q2 are compared. And a comparison / determination device 10 that makes a determination based on the comparison. That is, the first reference image R1 and the second reference image R2 generated from the first image P1 and the second image P2 in step 2 are three-dimensional images, and the first captured image Q1 and the second captured image Q2 are also the same. 3D image.

  If it is determined that there is damage (F17, YES), a signal is immediately transmitted to the escalator control panel 18 to stop the operation of the escalator (F18), and the remote control command room is connected via the communication device 19. (F19) that damage has occurred. It is also possible to transmit the image of step 2 showing the damage status together with this notification.

  When the above simultaneous equations are not satisfied, that is, when there is information only in one of the image coordinates and D is not 0 (F17, NO), it is determined that there is no damage and only fouling ( If it is F20), the control room (not shown) or the like is notified that the contamination has occurred (F21). In this case, whether or not it is necessary to stop the operating escalator and remove the contamination can be determined by looking at the image received in the operation control room.

According to the step abnormality detection method and apparatus for an escalator described and illustrated above, it is possible to detect an abnormality including not only step contamination but also damage such as damage or partial omission.
Embodiment 2. FIG.
In the flowchart shown in FIG. 13, the reference image and the captured image are two-dimensional images, and there are some differences, but basically the same steps as those shown in FIG. 12 are executed. That is, in the step of generating and storing the reference images R1 and R2 (F01-F06), the first reference image R1 and the second reference image R2 are both two-dimensional image data, and similarly, the captured images Q1 and Q2 are stored. Both the first captured image Q1 and the second captured image Q2 in the step (F11) of generating image data are two-dimensional image data.

  In addition, it is determined that there is an abnormality (F14), and the content of the determination in the step (F15) of comparing the first captured image Q1 and the second captured image Q2 is the first captured image Q1 and the second captured image Q2. It is different from the determination of whether or not there is a difference between image data (D = | Q1 (x, y, z, T) −Q2 (x, y, z) |)). . If D ≠ 0, it is determined that there is damage (F17), the operation is stopped (F18), the damage is notified (F19), and the process is terminated. If D = 0, it is determined as fouling (F20), notification (F21) is made, and the process returns to the determination step (F10) as to whether or not the position of step 2 is a predetermined position. The other points are the same as the flowchart shown in FIG.

  This escalator step abnormality detection method can also reliably recognize and detect a three-dimensional abnormality such as breakage.

  The apparatus illustrated and described above is merely an example, and various modifications are possible, and the features of each specific example can be used altogether or selectively combined.

  For example, in the escalator step abnormality detection method described so far, the time T is determined using the two pairs of detectors 14 and 15 that the step 2 is at a predetermined position for capturing the reference image or the captured image. However, whether or not step 2 is at the predetermined position can be determined based on time information in which the predetermined position is synchronized with the circulation speed of step 2. For this purpose, it is necessary to provide a device for generating time information synchronized with the circulation speed of Step 2 in the step abnormality detection device of the escalator.

  In such an escalator step abnormality detecting device, the escalator control panel 18 stores the three-dimensional or two-dimensional image data at the time “T” and the auxiliary storage device 13 based on the time information synchronized with the operation speed. The stored reference images R1 and R2 are developed in the main storage device 11, and the central processing unit 12 performs comparison (F04). According to this apparatus, although the step position identification accuracy is slightly inferior to that using two detectors 14 and 15, and the amount of calculation for position identification increases, the number of necessary parts to be installed is small. Decrease.

  The present invention can be used for an escalator step abnormality detection device.

  1 step circulation path, 2 step of escalator, 3, 4 photographing device (first and second camera), 5 tread, 6 machine room, 10 comparison judgment device, 11 main storage device, 12 central processing unit, 13 auxiliary storage Device, 14, 15 Detector (14 1st detector, 15 2nd detector), 16 Trailing edge, 17 Leading edge, 22 Three-dimensional abnormality (damage), P1 to P4 1st image to 4th image , Q1 first captured image, Q2 second captured image, R1 first reference image, R2 second reference image, T time (predetermined position), t16, t17 detection time point.

Claims (16)

To detect escalator step abnormalities,
A first image of the reference step taken from a first predetermined angle with respect to the reference step when a normal reference step of the escalator is at a predetermined position in the step circulation path, and a first image different from the first predetermined angle A step of generating and storing a second image of the reference step taken from two predetermined angles as a first reference image and a second reference image, respectively;
A first image of the step and a second predetermined image taken from the first predetermined angle with respect to the step when the step to detect abnormality circulating in the step circulation path of the escalator is at the predetermined position. Generating a second image of the above step photographed from an angle as a first photographed image and a second photographed image, respectively;
Compare at least three of the first reference image, the second reference image, the first photographed image, and the second photographed image, and determine the three-dimensional abnormality of the step based on the difference between these images. An escalator step abnormality detection method comprising: a step of determining presence or absence.   The step of determining the presence / absence of the abnormality includes performing at least one of a comparison between the first captured image and the first reference image and a comparison between the second captured image and the second reference image. A step of determining whether or not there is an abnormality based on the step, and when the presence of the abnormality is determined, the first captured image is compared with the second captured image, and the abnormality is a three-dimensional abnormality. A step abnormality detection method for an escalator according to claim 1, further comprising a step of determining whether or not. The first reference image and the second reference image generated from the first image and the second image of the step are three-dimensional images;
The step abnormality detection of an escalator according to claim 1 or 2, wherein the first photographed image and the second photographed image generated from the first image and the second image of the step are three-dimensional images. Method. The first reference image and the second reference image generated from the first image and the second image of the step are two-dimensional images;
3. The escalator step abnormality detection according to claim 1, wherein the first captured image and the second captured image generated from the first image and the second image of the step are two-dimensional images. Method.   The predetermined position in the step circulation path is in a machine room in which a step reversing part of the escalator is accommodated, and photographing from the first predetermined angle and the second predetermined angle is performed in the machine room. The step abnormality detection method of the escalator as described in any one of 1-4.   The escalator step abnormality detection method according to any one of claims 1 to 5, wherein the first and second images of the step are images obtained by extracting a tread of the step.   The determination as to whether or not the step is at the predetermined position is made by detecting a trailing edge in the moving direction of the step in the circulation path and a leading edge of the next step. The step abnormality detection method of the escalator as described in any one of -6.   The escalator according to any one of claims 1 to 6, wherein whether or not the step is at the predetermined position is determined based on time information synchronized with the circulation speed of the step. Step abnormality detection method. To detect escalator step abnormalities,
A detection device for detecting that the step of the escalator is at a predetermined position in the circulation path;
When the step is a known normal and reference step, the reference step at the predetermined position is photographed from a first predetermined angle and a second predetermined angle different from the first predetermined angle with respect to the reference step. When the first reference image and the second reference image are generated, respectively, and the step is a step for detecting an abnormality, the first predetermined angle and the second predetermined angle to the predetermined position with respect to this step. A photographing device for photographing the above steps and generating a first photographed image and a second photographed image, respectively;
A storage device for storing the first reference image, the second reference image, the first captured image, and the second captured image;
At least three of the first reference image, the second reference image, the first photographed image, and the second photographed image are compared, and the presence or absence of a three-dimensional abnormality in the step is determined based on the difference between these images. An escalator step abnormality detection device comprising a comparison / determination device for determination.   A comparison / determination device for determining the presence / absence of the abnormality performs at least one of a comparison between the first reference image and the first captured image and a comparison between the second reference image and the second captured image. And a device for determining the presence or absence of the abnormality in the step based on the result, and when the presence of the abnormality is determined, the first captured image and the second captured image are compared to determine the abnormality in a three-dimensional manner. The escalator step abnormality detection device according to claim 9, further comprising a comparison determination device that determines whether or not the abnormality is abnormal.   The comparison determination device includes the first reference image and the second reference image that are three-dimensional images generated from the first image and the second image in the step, and the first image and the second in the step. The apparatus includes a device for comparing the first captured image and the second captured image, which are three-dimensional images generated from an image, and determining whether there is an abnormality based on a difference between the images. The escalator step abnormality detection device according to 9 or 10.   The comparison determination apparatus includes the first reference image and the second reference image that are two-dimensional images generated from the first image and the second image in the step, and the first image and the second in the step. The apparatus according to claim 1, further comprising: a device that compares the first captured image and the second captured image, which are two-dimensional images generated from an image, and determines whether there is an abnormality based on a difference between the images. The escalator step abnormality detection device according to 9 or 10.   The escalator step abnormality detection device according to any one of claims 9 to 12, wherein the predetermined position and the photographing device are in a machine room in which the step inverting unit of the escalator is housed.   The escalator step abnormality detecting device according to any one of claims 9 to 13, wherein the photographing device photographs a tread of the step.   A first detector that is provided corresponding to the predetermined position of the step in the circulation path and detects a trailing edge in the moving direction of a certain step, and a first detector that detects a leading edge in the moving direction of the subsequent step. And the predetermined position of the step is determined based on a time between a detection time point of the trailing edge in the moving direction and a detection time point of the leading edge in the moving direction. Item 15. The escalator step abnormality detection device according to any one of Items 9 to 14.   The apparatus which produces | generates the time information synchronized with the circulation speed of the said step, The determination whether the said step exists in the said predetermined position is performed based on the said time information. The escalator step abnormality detection device according to claim 14.

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