JP2008027259A - Suspicious object or shape change detecting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that when a suspicious object is created in the color of an installation site, or it is fitted into a recess, the suspicious object may not be detected only by simply comparing images based on their colors, or an observer or a maintenance staff who checks the images cannot determine the object as suspicious. <P>SOLUTION: A suspicious object is detected by applying an infrared pattern to a front panel of an ATM to be monitored by an infrared pattern projecting device from one side, acquiring an image by photographing the front panel with an infrared monitoring camera from the other side, and measuring the difference between this image and a reference image (an image taken beforehand when a suspicious object is not placed). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The technical field relates to a system for detecting a suspicious object by photographing an automated transaction machine (ATM) with a monitoring camera and detecting a shape change of the object.

  Conventionally, when a user makes a cash transaction at an ATM, the identity of the card is verified by using a card and a password, but the information on the card surface and the password from the back of the user who is currently trading at the ATM are being used. There have been many crimes, such as devices that can be used to steal numbers, or that can illegally read card information or wireless cameras for voyeurism, so that they do not stand out and are attached to ATMs. On the other hand, the installation of surveillance cameras to monitor suspicious behavior in financial institution stores and the installation of cameras that shoot people inside ATMs are trying to find suspicious people and suppress the occurrence of crime. .

  On the other hand, although not related to monitoring of suspicious objects, there are Patent Documents 1 and 2 as techniques for measuring the shape of an object.

  In Patent Document 1, the pattern light irradiation unit emits pattern light that causes a pattern to be generated on the measurement object X and the background object Y. As a result, edge feature points are generated on the smooth surface, and the three-dimensional information extraction unit uses the plurality of images input from the image input unit and the motion information input from the motion information input unit to 3D information is extracted. This is a technique for determining the presence of a three-dimensional surface and accumulating the surface information to obtain three-dimensional surface information.

  In Patent Document 2, in a three-dimensional measurement apparatus that projects pattern light onto an object and measures the shape of the object based on the reflected light of the pattern light reflected by the object, whether or not the measurement conditions such as the reflectance of the object and the shooting distance are appropriate Disclosure technology is disclosed.

JP-A-6-221825 Japanese Patent Laid-Open No. 10-2712

  Image comparison processing that simply checks the color difference if the suspicious object is created in exactly the same color as the ATM front panel, or if the suspicious object is embedded in the depression of the ATM front panel Then there is a possibility that suspicious objects cannot be detected.

  Patent Document 1 discloses a three-dimensional image for each part of a measurement object from the movement of the image of the measurement object on the obtained image by continuously shooting the measurement object while moving the image input unit and changing the shooting position. Since it is based on a measurement method for obtaining coordinates, it is necessary to move the image input unit. Therefore, there is no space in which the image input unit can be moved (moved) in a limited space such as an ATM booth, and it cannot be employed for ATM monitoring.

  Moreover, in patent document 2, since both the light projection point and the light receiving point are provided on the same side of the three-dimensional measuring device, if a suspicious object is attached to the recess of the front panel of the ATM, the three-dimensional measuring device. Depending on the installation location of the suspicious object, there is a problem that the change in the shape of the monitoring object before and after the suspicious object cannot be captured.

  In addition, these are techniques that require advanced counting processing in the process of calculating three-dimensional coordinates, and there are problems in that the control becomes complicated, such as requiring multiple imaging.

  The front panel of the ATM to be monitored is irradiated with an infrared pattern from one side by an infrared pattern irradiation device, and the front panel is photographed from the other side by an infrared monitoring camera to obtain an image. A suspicious object is detected by measuring a difference from a basic image (an image taken in advance with no suspicious object installed).

  According to the present invention, even if a suspicious object is attached to an ATM, and the suspicious object is created in the same color as the installation location or is inserted into a recess, the suspicious object is surely and easily provided. Can be detected.

  Hereinafter, preferred embodiments of the present invention will be described in detail, but the configuration and the like are not limited.

  An external view of the suspicious object (or shape change) detection system is shown in FIG. This system irradiates the front panel of the ATM 101 to be monitored with an infrared pattern from one side by the infrared pattern irradiating device 102, and images the front panel from the other side with the infrared monitoring camera 103. The suspicious object or a change in its shape is detected by measuring the difference between the acquired image and the basic image (an image captured in advance without the suspicious object being installed).

  As shown in FIG. 1, installation tables 104 are provided on both the left and right sides of the ATM 101, and the infrared pattern irradiation device 102 and the infrared monitoring camera 103 are separately installed on the left and right. The installation table 104 is provided so that the infrared pattern irradiation device 102 and the infrared monitoring camera 103 can sufficiently monitor the front panel of the ATM 101. If this purpose can be achieved, the installation table 104 is not provided. There is no problem even if the infrared pattern irradiation device 102 and the infrared monitoring camera 103 are installed on the table of the ATM 101 itself.

  The monitoring computer 106 controls the operations of the infrared pattern irradiation device 102 and the infrared monitoring camera 103. The monitoring computer 106 is also connected to the ATM control unit 105, and based on the detection by the customer detection unit 108, detects that the customer is not near the ATM 101, that is, the presence or absence of the customer and starts monitoring. On the other hand, while it is detected that the customer is close to the ATM 101, the state of the customer's operation is captured in the photographed image by the infrared monitoring camera 103 and there is no meaning of monitoring, so the monitoring is stopped. In this embodiment, it is assumed that a malicious customer attaches a suspicious object (such as a voyeur camera or a skimming device) to the front panel while using the ATM 101, and starts monitoring as soon as the customer leaves the ATM 101. So (monitor mode), you can instantly detect suspicious object detection. As will be described later, means such as the card mechanism unit 109 may be used to determine whether there is a customer using the ATM 101.

  When a suspicious object is found, an attendant is notified and a screen for calling attention is displayed on the display input unit 107 and the operation of the ATM 101 is stopped. As a result, it is possible to prevent crimes such as voyeurizing personal information displayed on the display / input unit 107 using a suspicious object or skimming information on a card inserted into the card mechanism unit 109.

  FIG. 2 shows a block diagram of the suspicious object detection system. The ATM 101 includes an ATM control unit 105 that controls the entire ATM, a display input unit 107 configured by a touch panel that displays operation guidance and accepts user operations and key inputs pressed by a finger, and a customer uses the ATM 101. A customer detecting unit 108 that detects that the card is close to the card, a card mechanism unit 109 having a function of reading / writing data stored in the card insertion / ejection, the magnetic stripe of the card or the IC card, and the card mechanism unit 109 A card detection unit 201 that detects that a card has been inserted and a card has been ejected from the card mechanism unit 109, a storage unit 202 that stores various data, and whether or not the customer is using the ATM 101. And a communication unit 203 that transmits information to the monitoring computer 106 via a line cable. The ATM control unit 105 controls the above-described components of the ATM 101, and includes a CPU and a memory that stores information related to screens necessary for various transactions and log information when transactions are processed. Yes.

  The monitoring computer 106 includes a control unit 211 that controls the entire monitoring computer 106, activation and deactivation of the infrared pattern irradiation device (simply irradiation unit) 102 and infrared monitoring camera (imaging unit) 103, image transfer, and the ATM 101. A monitoring control unit 212 that controls detection of a suspicious object from an image on the front panel, and a warning unit that issues a command to warn the suspicious object by voice guidance or display to the ATM control unit 105 when a suspicious object is detected. 213, a storage unit 214 that stores various information, and a communication unit 217 that transmits alarm and suspicious object information to the ATM 101 via a line cable. The storage unit 214 stores a basic image storage unit 215 that stores and stores in advance an image of the front panel of the ATM 101 when no suspicious object is attached, and detects a suspicious object when in the monitoring mode. Therefore, an image storage unit 216 for storing a newly acquired image is provided.

  The control unit 211 controls the infrared pattern irradiation device 102 and the infrared monitoring camera 103. The infrared pattern irradiation device 102 and the infrared monitoring camera 103 are collectively referred to as a monitoring unit 218.

  A mechanism for detecting a suspicious object will be described with reference to FIGS. Among these, the acquisition process of an image (basic image) acquired when a suspicious object is not installed in FIGS. 3 to 6 will be described in detail, and acquired when a suspicious object is installed in FIGS. The process of acquiring an image (suspicious object detection image) will be described in detail. FIG. 11 shows a flowchart for finding a suspicious object by comparing these basic images with the suspicious object detection image when the ATM 101 is set to the monitoring mode.

  FIG. 3A shows a state in which an infrared pattern irradiation device 102 irradiates a grid-like infrared pattern. By adjusting the distance between the infrared pattern irradiation device 102 and the front panel of the ATM 101, the size of the grid represented by the infrared pattern can be freely changed. FIG. 3B shows a state in which the front panel is photographed by the infrared monitoring camera 103. When these two are combined, the state shown in FIG. 4 is obtained. Next, a part surrounded by a circle in FIG. 4 (enlarged display in FIGS. 5 and 6) will be described with attention.

  In FIG. 5, the infrared pattern irradiation device 102 is on the customer side toward the ATM 101, and the front panel is irradiated with an infrared pattern from the right side, and the front panel of the ATM 101 is viewed from the infrared pattern irradiation device 102 side (right side). The infrared pattern is represented by a straight line without bending.

  In FIG. 6, the infrared monitoring camera 103 is on the customer side toward the ATM 101, and images the front panel from the left side. Here, an image obtained by photographing the front panel irradiated with the infrared pattern from the infrared monitoring camera 103 side (left side) is shown, and the horizontal line C-C is represented by a straight line because it is a portion having no unevenness, but the vertical line A -A and BB are represented as distorted lines according to the unevenness of the front panel. An image of the entire front panel in this state is acquired by the infrared monitoring camera 103 and stored in advance in the basic image storage unit 215 of the monitoring computer 106 as a basic image.

  Next, an image (suspicious object detection image) acquired when a suspicious object is installed will be described with reference to FIG. FIG. 7A shows a state in which a grid-like infrared pattern is irradiated by the infrared pattern irradiation device 102 as in FIG. 3A. FIG. 7B shows a state in which a suspicious object having a rectangular parallelepiped shape is installed at a cross mark portion from the center right of the front panel, and the front panel in this state is photographed by the infrared monitoring camera 103. When these two are combined, the result is as shown in FIG. 8, and the part circled in FIG. 8 (enlarged display in FIGS. 9 and 10) will be described.

  In FIG. 9, the infrared pattern irradiation device 102 is on the customer side toward the ATM 101 and irradiates the front panel with the infrared pattern from the right side. Here, the front panel is shown as viewed from the infrared pattern irradiation device 102 side (right side), and the infrared pattern is represented by a straight line without bending.

  Here, looking at the horizontal line, the horizontal line II where the suspicious object is installed and the horizontal line JJ where the suspicious object is not installed are both represented by straight lines without bending the infrared pattern. Yes. In addition, the vertical line H-H of the part where the suspicious object is installed and the vertical line GG of the part where the suspicious object is not installed are both represented by straight lines without bending the infrared pattern. Yes. Accordingly, when viewed from the infrared pattern irradiation device 102 side, a grid-like infrared pattern is accurately represented regardless of whether or not a suspicious object is installed. Therefore, if an imaging unit is installed as an infrared camera at the same position as the infrared pattern irradiation device (irradiation unit) 102, a suspicious object cannot be accurately captured.

  In FIG. 10, the infrared monitoring camera 103 is on the customer side facing the ATM 101, and images the front panel from the left side. Here, an image obtained by photographing the front panel irradiated with the infrared pattern from the infrared monitoring camera 103 side (left side) is shown, and the horizontal line FF is represented by a straight line. About a horizontal line, it is the same as that of FIG. 6 when a suspicious object is not installed. However, the vertical line is clearly different from FIG. 6 when no suspicious object is installed. The vertical line DD where the suspicious object is not installed is shown as a distorted line according to the unevenness of the front panel, but the vertical line EE where the suspicious object is installed is a dent of the front panel. It is shown in a state with little distortion because it compensates for. An image of the entire front panel in this state is acquired by the infrared monitoring camera 103 and stored in the image storage unit 216 as a suspicious object detection image.

  Comparing the basic image shown in FIG. 6 and the suspicious object detection image shown in FIG. 10, it can be seen that the vertical lines BB and the vertical lines EE are different in the shape of the distorted portion. By detecting this difference in shape, it can be detected that a suspicious object is installed. If you know in advance the size of the grid (the size of the quadrangle that can be enclosed by the lines), calculate the size of the suspicious object by calculating the number of lines with distortion. Is possible. Moreover, if the position of the part where the distortion has occurred can be detected, the installation location of the suspicious object can be known.

  For example, it is set that the infrared pattern is irradiated so that the size of the lattice is 1 cm × 1 cm. As shown in FIG. 9, when there is a difference in shape between the two vertical lines, it can be seen that the suspicious object has a length of 1 cm to 3 cm in the horizontal direction. However, in the method of this embodiment, the infrared pattern irradiation device 102 and the infrared monitoring camera 103 are installed at the same height, and the infrared pattern irradiation and camera shooting are executed from the left and right directions. It is difficult to find out if it has a length. If the height at which the infrared pattern irradiating device 102 and the infrared monitoring camera 103 are installed is changed as much as possible, the horizontal line represented in the image captured by the infrared monitoring camera 103 will be distorted by the changed amount. Thus, the size of the suspicious object in the vertical direction can be calculated from the difference in the shape of the horizontal line when the suspicious object is installed and when it is not installed.

  FIG. 11 is a flowchart when a suspicious object is found by comparing a basic image and a suspicious object detection image. The operation subject is the control unit 211 of the monitoring computer 106.

  The control unit 211 of the monitoring computer 106 is in a standby state and waits for reception of information indicating whether or not the customer is using the ATM 101 from the ATM 101 (step 1101). At this time, the operations of the infrared pattern irradiating device 102 and the infrared monitoring camera 103 are set to a pause state. That is, the monitor mode is not set.

  On the other hand, in the ATM 101, the ATM control unit 105 detects whether the customer is near the ATM 101 or the presence or absence of the customer using the customer detection unit 108 at regular intervals. Then, information regarding the detection result is transmitted to the monitoring computer 106 via the communication unit 203. For example, when a customer is detected, the ATM control unit 105 determines that there is a customer who is using the ATM 101 based on this detection, and transmits information indicating that there is a current ATM user. If no customer is detected, the ATM control unit 105 determines that there is no customer who is using the ATM 101 based on this detection, and transmits information indicating that there is no current ATM user. Note that it is not always necessary to use the customer detection unit 108 to determine whether or not there is a customer who is using the ATM 101, based on means such as card insertion detection by the card mechanism unit 109 or input detection to the display input unit 107. You may judge. In addition, it is desirable that the ATM 101 is provided with a timer so that information is transmitted to the monitoring computer 106 every predetermined time (for example, 3 minutes) instead of always checking the presence or absence of the customer by the customer detection unit 108.

  The control unit 211 of the monitoring computer 106 receives information indicating the usage status of the ATM 101 (“current ATM user present” or “current ATM user absent”) transmitted from the ATM 101 at regular intervals. Based on this, it is determined whether or not to start the operation of the monitoring unit 218 (step 1102). It can be said that the following steps from step 1103 shown below are controlled by the monitoring control unit 212.

  Here, if the received information indicating the usage status of the ATM 101 is “there is a current ATM user”, the operation of the monitoring system is not started and the standby state is returned. On the other hand, if the received information indicating the usage status of the ATM 101 is “no current ATM user”, the monitoring system starts operating (monitoring mode) and faces the front of the ATM 101 as shown in FIGS. An infrared pattern is irradiated on the front panel of the ATM 101 by the infrared pattern irradiation device 102 at the position (customer side) and from the right side (step 1103). Subsequently, the front panel of the ATM 101 is irradiated with the infrared pattern by the infrared monitoring camera 103 from the left side at a position facing the front surface of the ATM 101, and the obtained image (suspicious object detection image) is stored in the image storage unit 216. Store (step 1104).

  Next, the control unit 211 (monitoring control unit 212) of the monitoring computer 106 compares the suspicious object detection image acquired in step 1104 with the basic image stored in the basic image storage unit 215 in advance (step 1105). ). This comparison is to compare the difference in shape due to the distortion of the lattice, as described in FIGS.

  The control unit 211 of the monitoring computer 106 determines whether or not there is a difference between the suspicious object detection image and the basic image. If it is determined that there is no difference, the control unit 211 returns to the standby state (step 1106). If it is determined that there is a difference, it is determined that this difference is due to a suspicious object (step 1107). Subsequently, the warning unit 213 is used to issue a warning to the ATM 101 or a financial institution staff (step 1108).

  For example, the process for issuing a warning is as follows. The control unit 211 of the monitoring computer 106 transmits information indicating that the suspicious object is installed and the location of the suspicious object to the ATM 101 via the communication unit 217. The ATM 101 receives the information via the communication unit 203 and displays a guidance screen such as “Suspicious items are installed in the ATM, so the transaction will be canceled”. To caution and wait for the attendant to suspend the transaction. In addition, information indicating that the suspicious object is installed and information indicating the installation location of the suspicious object is notified to the staff via the communication unit 217, and the information is sent to the ATM 101. Warnings can be substituted by output means such as sound as well as display.

  A mechanism in the case of using detection of card insertion into the card mechanism unit 109 and card ejection from the card mechanism unit 109 to determine whether or not there is a customer who uses the ATM 101 described above will be described with reference to FIGS. . 13 and 14 are views of the ATM 101 as viewed from the side. The ATM 101 includes an ATM control unit 105 and a card mechanism unit 109, and the ATM control unit 105 and the monitoring computer 106 are connected to each other.

  FIG. 13 shows a scene in which a customer is performing an input operation using the display input unit 107. When the card is inserted into the card mechanism unit 109, the ATM control unit 105 detects the card detection unit 201 and determines that there is a customer who is using the ATM 101 based on this detection. Is transmitted to the monitoring computer 106 via the communication unit 203.

  FIG. 14 shows a scene where the customer finishes the input operation. When the card is ejected from the card mechanism unit 109, the ATM control unit 105 detects that by the card detection unit 201, and based on this detection, determines that there is no customer who is using the ATM 101. Is transmitted to the monitoring computer 106 via the communication unit 203. Then, as described above, the infrared pattern irradiating device 102 irradiates the front panel with an infrared pattern, and the infrared monitoring camera 103 shoots the front panel irradiated with the infrared pattern.

  As described above, a suspicious object can be reliably detected by irradiating the front panel with an infrared pattern from a certain direction and photographing the infrared pattern irradiated with the infrared pattern from another direction. Further, by using infrared rays, it is possible to detect suspicious objects made of the same color as the front panel of the ATM 101, which is difficult to detect by simple image processing. In addition, the location and size of the suspicious object can be specified by measuring the position and number of infrared rays whose shapes have changed.

  In this embodiment, infrared rays are used for pattern irradiation and camera. Although it is possible to configure a suspicious object detection system using visible light, the customer can recognize that the front panel is illuminated with visible light, so the customer may feel anxious. Infrared rays are also used from the viewpoint of removing such anxiety.

  In this embodiment, the infrared pattern irradiation device 102 irradiates an infrared pattern on the front panel of the ATM 101 from the right side toward the ATM 101, and the infrared monitoring camera 103 images the front panel of the ATM 101 from the left side. May be reversed. For example, the same effect can be obtained by irradiating the front panel of the ATM 101 with the infrared pattern irradiation device 102 from the left side and photographing the front panel of the ATM 101 with the infrared monitoring camera 103 from the right side.

  Depending on the intensity of the light of the infrared pattern, there is a possibility that a difference in the shape of the infrared light is detected between the basic image and the suspicious object detection image even if no suspicious object is installed on the front panel of the ATM 101. is there. In such a case, if a warning is issued once from the warning unit 213, there is a problem that a worker is wasted troublesomely or the operation of the ATM 101 is stopped. Therefore, the suspicious object detection image is acquired at regular intervals, compared with the basic image, and the warning unit 213 warns for the first time when a difference is detected continuously for a predetermined number of times. As a result, the accuracy of suspicious object detection can be improved.

  In the example described above, an example in which the size of the grid of the infrared pattern is 1 cm × 1 cm is given, and a specific example in which a suspicious object larger than the grid can be reliably detected has been given. However, suspicious objects smaller than the grid may not be detected depending on the installation location. A modification for solving this problem will be described. Note that the basic configuration and flow are the same as those in the above-described example, and therefore will be omitted.

  FIG. 12 shows an example of changing the direction of the infrared pattern irradiation device 102 (changing the angle between the infrared pattern irradiation device 102 and the front panel). In this way, the suspicious object detection image is acquired while moving the infrared pattern at a certain angle. The angle control is preferably performed by the monitoring control unit 212. In FIG. 12, a reference point for calculating an angle is provided at the lower right of the front panel of the ATM 101, and an angle formed by a straight line connecting the reference point on the front panel and the infrared pattern irradiating device 102 and the front panel is represented by pattern 1. Is M degrees and pattern 2 is N degrees. There is a relationship of M <N between M and N.

  In the pattern 2, the front panel is irradiated with an infrared pattern shifted to the right by half the lattice from the pattern 1. For both pattern 1 and pattern 2, basic images 1 and 2 having no suspicious objects are stored in advance in the basic image storage unit 215. When the monitoring mode described in the above-described example is set, the image captured and acquired with the pattern 1 is compared with the basic image 1 stored in advance, and the image captured with the pattern 2 and the basic image 2 are compared. Accordingly, a suspicious object smaller than the lattice can be detected, and the accuracy of detecting the suspicious object or the shape change can be improved.

External view of suspicious object detection system Block diagram of suspicious object detection system Diagram explaining the mechanism for acquiring a basic image when no suspicious object is installed Figure combining Figure 3 Enlarged view of Fig. 4 (1) Enlarged view of Fig. 4 (2) Diagram explaining the mechanism for acquiring a suspicious object detection image when a suspicious object is installed Figure combining Figure 7 Enlarged view of Fig. 8 (1) Enlarged view of Fig. 8 (2) Monitoring system flow chart The figure explaining a modification Diagram of card insertion detection mechanism Diagram of card discharge detection mechanism

Explanation of symbols

  DESCRIPTION OF SYMBOLS 101 ... ATM, 102 ... Infrared pattern irradiation apparatus, 103 ... Infrared monitoring camera, 104 ... Installation stand, 105 ... ATM control part, 106 ... Monitoring computer, 107 ... Display input part, 108 ... Customer detection part, 109 ... Card mechanism , 201 ... card detection unit, 202 ... storage unit, 203 ... communication unit, 211 ... control unit (monitoring computer), 212 ... monitoring control unit, 213 ... warning unit, 214 ... storage unit (monitoring computer), 215 ... basic image storage unit, 216 ... image storage unit, 217 ... communication unit

Claims (8)

In the suspicious object detection system that detects that a suspicious object is installed on the monitored object,
An irradiation device for irradiating a monitoring target with a lattice pattern of light rays;
A camera for photographing a monitoring object irradiated with light beams in a lattice pattern by the irradiation device;
A storage unit for storing an image of the monitoring object when a suspicious object is not attached as a basic image;
A suspicious object detection system, comprising: a suspicious object detection unit that detects a suspicious object from a difference in image change between an image captured by the camera and the basic image. The suspicious object detection system according to claim 1,
The suspicious object detection system characterized in that the irradiation device is installed on the customer side and on the right side toward the monitoring object, and the camera is installed on the customer side and on the left side toward the monitoring object. The suspicious object detection system according to claim 1 or 2,
The suspicious object detection system, wherein the monitored object is an ATM front panel. The suspicious object detection system according to claim 3,
A customer detection unit that detects whether the customer is near an ATM;
A suspicious object detection system that performs suspicious object detection by the suspicious object detection unit when the customer detection unit detects that a customer is not near an ATM. The suspicious object detection system according to claim 3,
A card mechanism for reading card information;
A card detection unit for detecting insertion of a card into the card mechanism unit and ejection of the card from the card mechanism unit;
A suspicious object detection system that performs suspicious object detection by the suspicious object detection unit when the card detection unit detects that a card has been ejected from the card mechanism unit. The suspicious object detection system according to claim 1,
The suspicious object detection system, wherein the light beam is an infrared ray. The suspicious object detection system according to claim 1,
A suspicious object detection system comprising: a warning unit that issues a warning to a customer when the number of times of suspicious object detection by the suspicious object detection unit exceeds a specified number. In a shape change detection system that detects a change in the shape of an object,
Irradiating means for irradiating the object with rays of a lattice pattern;
Imaging means for photographing an object irradiated with light beams in a lattice pattern by the irradiation means;
A memory for storing in advance a first basic image obtained from the photographing means by setting the irradiation means to a first angle and a second basic image obtained from the photographing means by setting the irradiation means to a second angle. Means,
The first image acquired from the photographing unit when the irradiation unit is set to the first angle is compared with the first basic image stored in the storage unit, and the irradiation unit is set to the second angle. A shape change detection system for detecting a change in the shape of an object by comparing the second image acquired from the photographing unit with the second basic image stored in the storage unit.

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