JP2007013814A - Setting apparatus for detection region - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a setting apparatus that uses an image for photographing a supervisory area to set an optional area with a height from a floor face within a supervisable area as a detection area of an object of detection processing. <P>SOLUTION: The setting apparatus displays an image for photographing the supervisory area, receives designation points for designating the detection area by distinguishing two-dimensional coordinate information on the floor face on the image from the other, calculates height information at the designation points by using the two-dimensional coordinate information and an imaging parameter at the designation points on the floor face, and the two-dimensional coordinate information of the designation points other than the floor face, uses all of the designation points on the floor face as reference height information, and converts the two-dimensional information on the image into detection area information of three-dimensional information by using the calculated height information for the designation points other than the floor face to obtain detection area information. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a monitoring device that three-dimensionally measures and detects that a monitoring target such as a person or an object exists in the monitoring area, and in particular, sets a detection area for a part of the monitoring area or sets one detection area. The present invention relates to a detection region or non-detection region setting device that can remove a region of a part from a detection region.

Conventionally, in a monitoring device that detects a monitoring target by three-dimensionally measuring a monitoring area, for example, as described in Patent Document 1, an object is irradiated with a microwave and the reflected wave is received. There has been proposed a microwave radar type object detection device that detects the position (distance and direction).
Since the conventional object detection apparatus uses microwaves, the monitoring area cannot be visually confirmed. For this reason, in the object detection apparatus, the detection range of the radar is displayed on the image obtained by capturing the monitoring area, and the detection area is confirmed and set.
For setting the detection area, first, a road to be set as a detection area on the image is surrounded by a setting frame. Next, the distance and direction corresponding to the pixels in the setting frame are calculated. An object located in a range specified from the distance and direction is set as a detection target. It should be noted that the detection target car uses the fact that the microwave reflection is stronger than the asphalt used on the road surface, and determines whether the position calculated from the strongest reflected wave is within the specified range. Yes.
JP 2001-155291 A

  However, in the conventional object detection apparatus, since the setting frame of the detection area is premised to be set on the road surface, a settable range can be formed only on the road surface. That is, since the setting frame exists on the road surface, the distance and direction corresponding to the pixels of the setting frame can be calculated by storing the depression angle, focal length, and installation height of the video camera in advance.

With reference to FIG. 8, a specific description will be given of a case where a conventional object detection device is used to set a detection area that is not on a road.
FIG. 8B is an image diagram illustrating an arrangement state of the object detection device. First, the object detection device is installed so that a monitoring area is located obliquely downward from above the monitoring location. Here, the object detection apparatus includes a video camera 1004 and a radar 1003. In addition, a sculpture 1001 is installed as a monitoring object.

  FIG. 8A shows an image taken by the video camera 1004. A method for setting a detection area to monitor the engraving 1001 will be described. As shown in FIG. 8A, a setting frame 1002 that is a detection region is set so as to surround the engraving 1001. In the conventional object detection apparatus, since it is assumed that the setting frame 1002 is on the floor surface (road surface), as shown by 1005 in FIG. An area extending in the direction to the floor surface is set.

  That is, the sculpture 1001 appears to be set as a detection area on the image, but the distance corresponding to the pixel of the setting frame 1002 to be calculated is, for example, the distance 1006 to the top of the sculpture 1001. Not the distance 1005 to the floor surface in the depth direction of the sculpture 1001. For this reason, the position of the sculpture 1001 is not within the distance range of the detection area of the radar 1003, and the sculpture 1001 cannot be monitored properly. Further, although the sculpture 1001 is originally intended to be monitored, the radar 1003 sets an area in the depth direction of the sculpture 1001 that is hidden by the sculpture 1001 and cannot be detected.

  Therefore, the conventional object detection apparatus can be applied only when a horizontal plane called a road surface is set as a detection range, and there is a problem that it is difficult to set a detection range of a monitoring target having a height.

  Therefore, the present invention has been made in view of such problems, and a monitoring object having a volume such as height, width, and depth in a detection region designated so that a human can intuitively recognize it on an image. It is an object of the present invention to provide a monitoring system capable of appropriately detecting a problem.

  In order to achieve this object, the present invention provides a setting device for setting a detection region or a non-detection region for a part of a monitoring region of a detector that detects a moving body using three-dimensional information. An imaging unit that captures an image of the image, a display unit that displays an image captured by the imaging unit, an input unit that performs a designation operation of a detection area or a non-detection area on the image displayed on the display unit, and an imaging unit A storage unit that stores imaging parameters including the installation height, depression angle, and focal length, and a detection area or non-detection area, and two-dimensional coordinate information on an image of a specified point specified by the input unit on the floor surface and other than the floor surface And using the two-dimensional coordinate information of the designated point on the floor and the imaging parameters and the two-dimensional coordinate information of the designated point other than the floor to calculate the height information of the designated point other than the floor, All designated points on the floor are A setting device including a control unit that stores a detection region or a non-detection region obtained by converting two-dimensional information on an image into three-dimensional information using the calculated height information for designated points other than the floor surface I will provide a.

  In the setting device having such a configuration, an operator views an image, which is two-dimensional information acquired by an imaging unit, while observing the display on the display unit, and designates specified points on the screen for specifying a region to be a detection region on the screen. By specifying differently from the surface, it can be converted into a detection region in the three-dimensional information used by the detector.

  In a preferred aspect of the present invention, the operator can easily input by displaying a guide on the display unit to inform the operator whether the designated point to be input is on the floor surface or other than the floor surface. .

  In a preferred aspect of the present invention, after a designated point on the floor surface is input to the display unit, a guide display that allows the designated point other than the floor surface to be input is made easy for the operator to input. Can be made.

  In a preferred aspect of the present invention, the two-dimensional information on the image is defined as XY coordinates with the horizontal and vertical directions of the image as the X axis and the Y axis, respectively, and the XY coordinate information at a specified point on the floor surface, Using the imaging parameter and the Y coordinate information of the designated point other than the floor surface, the perspective transformation of the image is reversed and the height information other than the floor surface is calculated.

  In a preferred aspect of the present invention, the designated point other than the floor surface designates a position immediately above the designated point on the floor surface in the monitoring area.

  According to this invention, the operator can easily set the detection area or the non-detection area of the three-dimensional information by designating the detection area on the image that is the two-dimensional information while looking at the image on the display unit.

Hereinafter, an embodiment when the present invention is applied to an art museum monitoring system will be described with reference to the drawings.
FIG. 1 is a block diagram showing the overall configuration of the monitoring system. The surveillance system detects the number of intruders and exhibits taken away in the monitoring device 20 installed in the security room where the guards of the museum are waiting, and each exhibition hall, hallway, entrance hall, etc. of the museum. It comprises the detector 10 installed for the purpose. The monitoring device 20 and each detector 10 are connected via a LAN (Local Area Network) 28. The monitoring device 20 is connected to a security center (not shown) via a telephone line 29. The detector 10 may be singular or plural depending on the scale of the museum or the like.

  The detector 10 includes a transmission unit 11, a plurality of reception units 12, an imaging unit 13, a detector storage unit 15, a communication unit 16, a detector control unit 14, and a power source 17 that supplies power to each unit.

  The transmission unit 11 is configured by an antenna, an oscillation element, and the like, and transmits a microwave to the monitoring region and outputs an output waveform of the microwave transmitted to the monitoring region to the reception unit 12.

The receiving means 12 is composed of an antenna, a mixer, a filter, and the like. The receiving means 12 receives the reflected wave reflected by the microwave transmitted by the transmitting means 11 and presents the output waveform from the transmitting means 11. The input is received, mixed with the reflected wave, filtered, and the measurement data is output to the detector control means 14.
In addition, the receiving means 12 is arranged in a total of three, one each on the left and right in the horizontal direction and one in the vertical direction. The receiving means 12 installed in the vertical direction is arranged at a position perpendicular to any horizontal direction of the horizontal receiving means 12, and the receiving characteristics of the antennas of the three receiving means 12 are the same direction. Oriented to.

  The imaging means 13 is a camera using an imaging element (photoelectric conversion element) such as a CCD, and images the monitoring area of the detector 10. The imaging unit 13 has an angle of view including all of the monitoring region (sensor field of view) that can be detected by the microwaves transmitted and received by the transmission unit 11 and the reception unit 12. This is because it is desired to use an image including at least a monitoring area that is a maximum range when setting a detection area to be described later. Further, an axis obtained by extending the imaging center of the imaging unit 13 perpendicularly from the imaging surface, that is, the optical axis, is housed in the housing of the detector 10 so as to substantially coincide with the direction of the directional center in the receiving unit 12.

The detector storage means 15 is composed of ROM (Read Only Memory) / RAM (Random Access Memory), various programs executed by the detection area information / detector control means 14 described later, various parameters of the detector 10, The detector number uniquely assigned to each detector 10 is stored.
Here, the various programs include a processing program for a control command from the monitoring device 20, an abnormality determination processing program for executing the abnormality determination processing means 141, and a distance measuring angle for executing the distance measuring angle processing means 142. A processing program.

  The various parameters include the installation height h, the depression angle ρ, the focal length f, etc. as imaging parameters related to the imaging means 13, and the arrangement information / receiving means 12 of each receiving means 12 as microwave parameters related to microwave transmission / reception. And a misalignment correction coefficient between the image pickup unit 13 and the like.

  The communication means 16 is composed of a communication IC or the like, and executes various communications with the monitoring device 20 and other detectors 10 via the LAN 28.

  The detector control means 14 is constituted by a CPU, and controls each component of the detector 10 according to various programs stored in the detector storage means 15. The main functions of the detector control means 14 are the functions of the distance measurement angle processing means 142 and the abnormality determination processing means 141. Furthermore, based on the command from the monitoring apparatus 20, the function which memorize | stores the detection area mentioned later in the detector memory | storage means 15 is also performed. Here, the distance measurement and angle processing means 142 and the abnormality determination processing means 141 will be described.

  Ranging and measuring processing means 142 measures the three-dimensional information of the distance, horizontal angle and vertical angle from the detector 10 to the moving object existing in the monitoring area by a two-frequency CW monopulse method in a so-called microwave radar sensor. It is processing to do. Specifically, pulse-shaped microwaves of two different frequencies are alternately transmitted from the transmission unit 11 to the monitoring region in a time division manner, and the reflected waves of the microwave pulses from the monitoring region are received by the plurality of receiving units 12. Receive at. Based on various parameters and received signals stored in the detector 15, the distance from the detector 10 to the moving object and the horizontal and vertical angles are measured.

  That is, the distance is measured based on the phase difference in the extracted Doppler component of each frequency by extracting the Doppler component included in each frequency in the reflected wave of the microwave transmitted from the transmission unit 11. The angle calculates the difference in the reception intensity of the microwave pulse in the two receiving means 12 in which the intensity difference is arranged horizontally or vertically. Similarly, the sum of received strengths is calculated. The angle is measured as the amount of deviation from the direction of the directivity center of the receiving means 12 using the difference and sum of the received intensity. In addition to the distance and angle, if the two-frequency CW method is used, the moving speed of the moving body can be measured.

  Since such a dual frequency CW monopulse system is a known system, a detailed description thereof will be omitted. In the present embodiment, the description is given using the dual-frequency CW monopulse system, but the present invention is not limited to this. For example, a mechanical system that automatically changes the reception direction of the reception antenna so as to scan the monitoring area. It goes without saying that any method may be adopted as long as it is a method capable of three-dimensional measurement, such as a radar sensor having a mechanism.

The abnormality determination processing unit 141 determines whether there is an abnormality in the monitoring area based on the three-dimensional information obtained by the distance measuring and angle measuring unit 142.
That is, information based on the same object is grouped from the three-dimensional information obtained by the distance measuring and measuring means 142 based on the moving speed, the detected position, and the like. Next, the size of the object is calculated from the grouped information, and it is determined whether the size is about the size of a predetermined monitoring target. Further, when the information is about the size of the monitoring target, whether or not the existing three-dimensional position is inside the detection area based on the detection area information stored in the detector storage means 15 described later. Determine. Here, abnormality determination is performed when it exists in the detection region. When the abnormality is determined, the communication unit 16 transmits an abnormality signal to the monitoring device 20.

  For example, when a sculpture that is an exhibit of a museum is to be monitored, it is compared whether the size of the object formed by the grouped information group is the same as the size of the sculpture set in advance. If it is not the same level, it is determined that there is no abnormality. On the other hand, if the degree is the same, it is determined whether the three-dimensional position indicated by the center of gravity of the object formed by the grouped information group exists in the detection region. If it is not within the detection area, it is determined that the person is looking at the sculpture, etc. On the other hand, if it exists in the detection area, it is determined that the sculpture is going to be taken away, and it is determined that there is an abnormality, and an abnormality signal is transmitted from the communication means 16 to the monitoring device 20 via the LAN 28.

  Next, the configuration of the monitoring device 20 will be described. The monitoring device 20 includes a control unit 21, a storage unit 22, a display unit 23, an input unit 24, a communication control unit 25, an output I / F 26, and a power supply 27.

  The storage unit 22 is composed of a ROM (Read Only Memory) / RAM (Random Access Memory), various programs such as a detection area setting program and a program for reporting an abnormality, an identification code of an installed location, and a security center It has various setting data such as a telephone number and a working area.

  The display unit 23 includes a liquid crystal display, an LED, a speaker, and the like, and displays an image captured by the imaging unit 13, a predetermined message, and the like.

  Although the input unit 24 may use a pointing pen or the like, a mouse is used in the present embodiment. The input unit 24 allows a detection area setter to operate the input unit 24 to specify and input a detection region on an image displayed on the display unit 23.

  The communication control unit 25 is composed of a communication IC and controls communication with the detector 10 via the LAN 28.

  The output I / F 26 is configured by a modem connected to the telephone line 29, and transmits an abnormal signal or the like to an external security center.

  The control unit 21 is configured by a CPU, and controls each component of the monitoring device 20 according to various programs stored in the storage unit 22. Here, the detection area setting processing unit 211 will be described as a function when the detection area setting processing program stored in the storage unit 22 is executed.

  The detection area setting process performed by the detection area setting processing unit 211 will be described with reference to FIG. The detection area setting processing unit 211 performs processing according to a detection area setting processing program stored in the storage unit 22.

  First, the setting of the detector 10 is completed, and the power of the detector 10 and the monitoring device 20 is turned on. Then, when the operator inputs the start of detection area setting from the input unit 24 of the monitoring device 20, the detection area setting process shown in FIG. 2 starts.

In step S001, the detector 10 for which the detection area is to be set is designated. At this time, the display on the display unit 23 is shown in FIG. In FIG. 4A, the fact that the detector number designated at 40 in the lower right of the display unit 23 is “1” is displayed.
The designation of the detector number is selected by operating the input unit 24, placing the cursor on the detector number area 40 on the screen of the display unit 23, and pressing the mouse button. In the detector number area 40, the detector number is incremented by 1 each time the mouse button is pressed. If the monitoring device 20 has a numeric keypad, the detector number of the detector 10 may be directly input if the input means is a numeric keypad. Alternatively, the detector numbers of the detectors 10 connected to the monitoring device 20 may be displayed as a list, and the detector numbers of the detectors 10 for which the detection area is to be set may be designated by the input unit 24.

  In step S002, an image captured by the imaging means 13 of the detector 10 designated in step S001 is acquired. That is, an image transmission command is transmitted from the communication control unit 25 to the designated detector 10 via the LAN 28. Then, in the detector 10 that has received the image transmission command from the communication means 16, the image taken by the imaging means 13 under the control of the detector 14, the imaging parameters stored in the detector storage means 15, the microwave sensor parameters, and the detection The area information is transmitted from the communication means 16 to the monitoring device 20 via the LAN 28. Such an image or the like is received by the communication control unit 25 and stored in the storage unit 22.

  In step S003, the image stored in the storage unit 22 is displayed on the display unit 23, and a predetermined coordinate system is applied to the image. Specifically, as shown in FIG. 4B, a two-dimensional coordinate system in which the horizontal direction of the image is the X axis, the vertical direction is the Y axis, and the origin of the X and Y axes is the center position of the image. Apply. However, in the following description, since the drawing becomes complicated, the display of the coordinate system is omitted.

  Here, the installation location of the detector 10 with the detector number “1” as the setting target will be described with reference to FIG. 3. FIG. 3 shows a state where the detector 10 is installed in the exhibition room 36. The imaging means 13, the transmission means 11, and the reception means 12 housed in the detector 10 are installed near the ceiling near the entrance 37 of the exhibition room 36 facing the sculpture 35.

  Next, in step S004, the input guidance 41 for facilitating the setting of the detection area is displayed on the display unit 23 (FIG. 4B). In the figure, the “floor surface” is hatched. This guides the operator to recognize that the point designated from the input unit 24 is the floor in the image. On the other hand, when “height” is hatched, it is a guide indicating that the height information from the floor is input.

In step S005, a floor area is designated. That is, as shown in FIG. 4C, the operator uses the input unit 24 to designate designated points A, B, C, and D. Specifically, the operator looks at the display unit 23 and surrounds the floor surface of the sculpture 35 to be monitored so that A (X _A , Y _A ), B (X _B , Y _B ), C ( Move the cursor to X _C , Y _C ), D (X _D , Y _D ) and press the mouse button at each point. In addition, since the line which connected A, B, C, D is displayed on the display part 23, the operator can confirm the specific condition of the detection area to be set easily.

In step S006, when the setting of the floor surface is completed, the operator moves the cursor to “height” of the input guidance 41 on the input unit 24 and presses the mouse button to confirm that “height” is hatched. Check. Here, “height” being hatched means that the input from now on inputs the height information from the floor surface in the setting of the detection area.
Thereafter, the cursor is moved to a point designated as the floor, for example, A, and the mouse button is pressed, and the cursor is moved to a position in the upper direction of A and desired to be a detection area, and the mouse button is pressed. F (X _F , Y _F ) in FIG. 4D is designated.

In step S007, the imaging parameters (installation height h, focal length f, depression angle ρ) received from the detector 10 and stored in the storage unit 22 are read out. Next, the coordinates of A, B, C, D, E, F, G, and H in real space are calculated. Here, F is directly above A, G is directly above B, H is directly above C, and E is immediately above D, which is a point at a height Z from the floor in real space.
Specifically, the points A, B, C, and D on the floor surface are obtained by substituting the X and Y coordinates into the formulas (1) and (2), and the U-V-W that is a real space orthogonal coordinate system. Convert to coordinate system.

Since points A, B, C, and D are points on the floor surface, the W coordinate is zero.
Based on the coordinates of F and A, the height W from the floor surface to F in the coordinates in the real space is calculated. Specifically, the calculation is performed by substituting “Y _F ” that is the Y coordinate of _F and “V _A ” that is the V coordinate in the real space of the point A that is the floor surface directly below into Formula (3).

  Here, Expressions (1), (2), and (3) are functions for executing inverse transformation of perspective transformation. That is, it is possible to convert from two-dimensional information (image) to three-dimensional information (stereoscopic information) by performing inverse transformation of perspective transformation that converts three-dimensional information (stereoscopic information) to two-dimensional information (image). Since the function for performing the inverse transformation of the perspective transformation has been proved geometrically, detailed description thereof is omitted here.

The results converted into the coordinates in the real space are A (U _A , V _A , 0), B (U _B , V _B , 0), C (U _C , V _C , 0), D (U _D , V _D, 0) to become. Here, W is 0 because the floor is the reference plane.

In the present embodiment, the detection region is a rectangular parallelepiped for the sake of simplicity. For this reason, E, F, G, and H, which are points not on the floor, are the height W calculated by Equation 3. The points E, F, G, and H that are not on the floor are E (U _E , V _E , W), F (U _F , V _F , W), G (U _G , V _G , W), H (U _H , V _H , W). In addition, when setting height individually about points other than a floor surface, what is necessary is just to calculate separately using the Y coordinate of the point on the floor surface which drew the perpendicular from the said point.

  Furthermore, the coordinate system is converted from the U-VW coordinate system, which is an orthogonal coordinate system in real space, to a polar coordinate system (r, θ, φ) with the detector 10 as the origin. The reason why such a polar coordinate system is used is that the detector 10 detects the position of the monitoring target based on information on the distance r from the detector 10, the horizontal angle θ, and the vertical angle φ.

  In step S008, the detection area ABCDEFGH 47 shown in FIG.

  In step S009, the operator looks at the display on the display unit 23 to confirm whether the input detection area indicates a desired area. Then, if it can be confirmed that the desired area, the OK button 44 is pressed. When the OK button 44 is pressed, the process proceeds to step S011. On the other hand, if it is different from the operator's intention, the NG button 45 is pressed. When the NG button 45 is pressed, the process proceeds to step S010.

  In step S010, the data used for the processes in steps S005 to S008 is cleared, and the process returns to step S005.

  In step S011, the polar coordinate system detection area information calculated in step S007 is stored in the storage unit 22.

  In step S012, it is determined whether or not the additional button 46 to be pressed when the operator wishes to specify another detection area is pressed within a predetermined time. Here, when the add button 46 is pressed, the process returns to step S005 to set the next detection area. If the add button 46 is not pressed, the process proceeds to step S013.

In step S013, the detection region information stored in the storage unit 22 in step S011 is transmitted from the communication control unit 25 to the detector 10 via the LAN, and the detection region setting process ends.
In the detector 10, when the detection unit information is received by the communication unit 16, it is overwritten and stored in the detector storage unit 15. The detection area information stored in the storage unit 22 may be deleted.
In addition, when a plurality of detectors 10 are connected to one monitoring device 20, this is performed for each detector.

  In the present embodiment, description is made on the assumption that the detection area information is set within the monitoring range of the detector 10. However, in the detector 10, when a region where the image captured by the imaging unit 13 is outside the monitoring range by the microwave (transmitting unit 11 / receiving unit 12) is set as the detection region, this is indicated by the display unit 23. May be displayed. In this case, it can be determined by storing information on the monitoring range by the microwave in the monitoring device 20 in advance, and comparing the detection area information with the information on the monitoring range.

  Next, operation | movement of the detector 10 by which the detection area was set in this way is demonstrated. The process of detecting that the sculpture 35 has been removed will be described with reference to the flowchart of FIG. 6 and FIG. 5 of the exhibition room 36 viewed from the side.

  FIG. 5A shows a state in which the sculpture 35 is placed at the original position of the exhibition room 36. 70a is the distance from the detector 10 to the upper part of the sculpture, 71a is the distance from the detector 10 to the center of the sculpture, 72a is the distance from the detector to the lower part of the sculpture, 73 is specified from the rectangular parallelepiped ABCDEFGH 47 displayed on the display unit 23 Detection area. Here, in order to simplify the description, the description will be given focusing on the distance r in the polar coordinate system.

First, in step S100, it is checked whether or not there is a change in the sensor visual field of the detector 10. If no change is detected, nothing is done and step S100 is repeated.
If a change is detected within the sensor field of the detector 10, the process proceeds to step S101.

In step S101, it is checked whether or not the variation detected in step S100 is within the detection area 73. This is because the detector 10 can detect fluctuations outside the set detection region 73 as long as it is within the sensor visual field.
If the detected variation is detected in a region other than the detection region 73, nothing is done and the process returns to step S100. This is because, for example, it is considered that the visitor walks around the sculpture 35, and in that case, there is no need for a process such as reporting an alarm.
If a change is detected in the detection area, the process proceeds to step S102.

In step S102, it is checked whether or not the detected fluctuation is equal to or greater than a predetermined threshold value.
When the sculpture 35 is taken away by a suspicious person, the distance 72b from the detector 10 to the lower part of the sculpture does not change as shown in FIG. It can be seen that the distance 71b to the center changes greatly.

FIG. 5 shows three points from the side, the upper part of the engraving from the detector 10, the central part of the engraving, and the lower part of the engraving. In this embodiment, the microwave radar capable of three-dimensional measurement in the detector 10 is shown. Since the sensor is used, it is possible to detect the variation in distance as described above for each part of the engraving.
Accordingly, when a variation in the distance of each part from the detector is detected and is greater than or equal to a predetermined threshold value, it can be determined that the sculpture 35 has been removed, so an abnormal signal is transmitted to the monitoring device in step S103.

  In the present embodiment, the detector 10 is installed indoors and the monitoring object removal detection process has been described as an example. However, the detector 10 can be installed outdoors and used as an intrusion monitoring sensor. In this case, for example, the detector 10 is installed under the eaves, and the vicinity of the gate is set as a detection region so as to detect a suspicious person who enters the site. And if the fluctuation more than a fixed value is detected in it, a warning is reported that a suspicious person has entered.

  In the present embodiment, it is described that an alarm is immediately notified when the variation detected in the detection region is equal to or greater than a predetermined threshold. This is effective when the monitored object is an expensive important object, but increases the possibility of reporting a false alarm due to some cause of noise. Therefore, whether or not the state in which the variation detected in the detection region is equal to or greater than a predetermined threshold has continued for a certain period of time may be used as a criterion for judgment.

  In the present embodiment, the shape of the detection region is an example of a rectangular parallelepiped that is easy to specify. However, if the procedure is to input the specified point included in the floor first and then input the height. It is not limited to a rectangular parallelepiped. By specifying the bottom vertex and the top vertex sequentially as the designated points and designating the sides connecting them, a detection area having a more complex shape can be designated.

  In the present embodiment, as shown in FIG. 3, the image pickup means 13 constituting the detector 10, the transmission means 11 and the reception means 12 that are sensor parts are housed in the same casing. In this way, there is an advantage that the trouble of adjusting the sensor visual field and the visual field of the imaging means 13 to be substantially the same is reduced. Further, in synchronization with the determination of the occurrence of abnormality by the monitoring device 20, for example, the moment when the sculpture 35 is removed can be captured as an evidence image by the imaging means 13.

However, the imaging means 13 may be a separate housing and may be combined with other components of the detector 10 at the time of installation. In addition, an operation method in which the imaging unit 13 is used only for setting the detection area and is removed after the setting is completed is also conceivable.
In this case, in order to ensure substantially the same image pickup means 13 and sensor field of view, it is desirable to have a “fitting” structure as shown in FIG.

  In the present embodiment, the detection area is set. However, the detection area may be set as a so-called non-detection area so as not to detect a moving body in the set area.

It is a block diagram which shows the structure of the monitoring system in embodiment of this invention. It is a flowchart which shows the setting method of the detection area | region in embodiment of this invention. It is a figure which shows the example of installation of the monitoring system in embodiment of this invention. It is a figure which shows the display of the display part 23 in embodiment of this invention. It is a figure which shows the difference in the distance measured by the presence or absence of the sculpture 35 in embodiment of this invention. It is a flowchart which shows the method to detect abnormality in embodiment of this invention. It is a figure which shows the example of the structure of "fitting" in embodiment of this invention. It is a figure explaining the detection area | region set when the prior art is applied to the monitoring object with height.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Detector 11 Transmission means 12 Reception means 13 Imaging means 14 Detector control means 15 Detector storage means 16 Communication means 17 Power supply 20 Monitoring apparatus 21 Control part 22 Storage part 23 Display part 24 Input part 25 Communication control part 26 Output I / F
27 Power supply 28 LAN
29 Telephone line 35 Engraving 40 Detector number 41 Input guidance 42 X-axis 43 Y-axis 44 OK button 45 NG button 46 Additional button 47 Detection area (on image)
70 Distance to engraving 71 Distance to engraving 72 Distance to engraving 73 Detection area (real space)

Claims (5)

A setting device that sets a detection region or a non-detection region for a part of a monitoring region of a detector that detects a moving object using three-dimensional information,
An imaging unit that captures an image of the monitoring area;
A display unit for displaying an image captured by the imaging unit;
An input unit for performing a designation operation of a detection region or a non-detection region on the image displayed on the display unit;
A storage unit for storing imaging parameters including a setting height, depression angle, and focal length of the imaging unit, and a detection region or a non-detection region;
Two-dimensional information on the image of the designated point designated by the input unit is received separately on the floor surface and other than the floor surface, and the two-dimensional information on the designated point on the floor surface, the imaging parameter, and the floor Calculate the height information of the designated point other than the floor using the two-dimensional information of the designated point other than the surface,
The designated points on the floor are all the reference height information, and the designated points other than the floor are the calculated height information, the detection area obtained by converting the two-dimensional information on the image into three-dimensional information, or A setting device comprising a control unit for storing a non-detection area in the storage unit.   The setting device according to claim 1, wherein the control unit causes the display unit to perform a guide display that informs an operator whether a designated point to be input is on the floor surface or other than the floor surface.   The setting device according to claim 2, wherein the control unit causes the display unit to perform guide display for inputting a designated point other than the floor surface after inputting the designated point on the floor surface. Define two-dimensional information on the image as XY coordinates with the horizontal and vertical directions of the image as the X-axis and Y-axis, respectively.
The control unit reverses the perspective transformation of the image using the XY coordinate information at the designated point on the floor surface, the imaging parameter, and the Y coordinate information of the designated point other than the floor surface, and other than the floor surface. The setting device according to claim 1, wherein the height information is calculated. The setting device according to claim 1, wherein the designated point other than the floor surface designates a position immediately above the designated point on the floor surface in a monitoring area.

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