JP5643032B2 - Tunnel monitoring system and tunnel monitoring method - Google Patents

Description

  The present invention relates to a technique for monitoring an abnormality in a tunnel through which a vehicle passes.

  In order to prevent accidents in tunnels where cars pass and to gather information quickly when accidents occur, surveillance cameras monitor the tunnels. Patent Document 1 describes that video transmitted from a plurality of surveillance cameras installed in a tunnel is output as one system signal. Patent Document 2 describes that a vehicle passing through a tunnel is imaged by a monitoring camera, and characters attached to the vehicle are recognized from the captured image.

JP 11-39589 A JP 2003-272086 A

  However, the above-described technique is intended to monitor an accident or the like in a tunnel based only on a vehicle included in an image captured within an imaging range by a surveillance camera. For this reason, when monitoring the tunnel in a wide range, it is necessary to install a large number of surveillance cameras without gaps so that there is no section outside the imaging range. This requires considerable installation costs and maintenance costs according to a large number of surveillance cameras. Here, there is a demand to perform wide-area monitoring in a tunnel as easily and efficiently as possible by using a smaller number of monitoring cameras.

  The present invention has been made in view of such a situation, and provides a tunnel monitoring system and a tunnel monitoring method for performing wide-area monitoring as efficiently and simply as possible using a small number of monitoring cameras.

  In order to solve the above-described problems, the present invention provides a plurality of monitoring cameras that are installed in a tunnel through which a vehicle passes and that have an imaging unit that images the inside of the tunnel, and a monitoring server that is connected to the plurality of monitoring cameras. A plurality of monitoring cameras are installed from upstream to downstream in the direction of traffic in the tunnel across a section outside the imaging range by the imaging unit, and monitor the captured images. A monitoring unit that receives images transmitted from a plurality of monitoring cameras; and a first unit that determines whether an image received by the receiving unit includes a car. If the vehicle detection unit and the first vehicle detection unit determine that the vehicle is included in the image transmitted from the upstream monitoring camera among the plurality of monitoring cameras, the upstream monitoring camera within a certain time from the time point Yo If the image transmitted from the downstream monitoring camera also causes the first vehicle detection unit to determine whether or not the vehicle is included, and if it is determined that the vehicle is included in the image transmitted from the downstream monitoring camera, A passage determination unit that determines that the vehicle has passed and determines that the vehicle has not passed when it is determined that the vehicle has not been included.

  Further, the present invention is characterized in that the monitoring server includes a warning unit that outputs a warning when the passage determination unit determines that the vehicle is not passing.

  Further, according to the present invention, the plurality of monitoring cameras are separated from a section of the indirect monitoring range that is outside the imaging range when the monitoring camera is fixed without swinging but is within the imaging range when swung. , Equipped with a swing drive unit that is installed from upstream to downstream in the direction of traffic in the tunnel and performs a swing motion so that the imaging unit captures the indirect monitoring range in response to an input swing request When the passage determination unit determines that the vehicle is not passing, the server sends a swing request to at least one of the upstream monitoring camera and the downstream monitoring camera to image the indirect monitoring range. A request transmission unit and an output unit that outputs an image of an indirect monitoring range imaged in response to the swing request received by the reception unit.

  In addition, the present invention provides a background image storage unit that stores in advance a background image that is an image that does not include a vehicle in the indirect monitoring range for each of the plurality of monitoring cameras, and a neck image that is transmitted from the monitoring camera. Compared to the background image stored in the background image storage unit in association with the surveillance camera that transmitted the image, the difference between the image and the background image is obtained for the image in the indirect monitoring range captured in response to the swing request. A second vehicle detection unit for determining whether or not a vehicle is included in the image is provided.

  In addition, the present invention provides a tunnel monitoring system including a plurality of monitoring cameras that are installed in a tunnel through which a vehicle passes and that includes an imaging unit that images the inside of the tunnel, and a monitoring server that is connected to the plurality of monitoring cameras. A tunnel monitoring method in which a plurality of monitoring cameras installed from upstream to downstream in the direction of traffic in a tunnel transmit images captured to a monitoring server across a section outside the imaging range of the imaging unit. A step in which the monitoring server receives images transmitted from a plurality of monitoring cameras, a step in which it is determined whether or not a vehicle is included in the received images, and upstream monitoring of the plurality of monitoring cameras When it is determined that a vehicle is included in the image transmitted from the camera, the image is transmitted from the monitoring camera downstream from the upstream monitoring camera within a certain time from the time point. If it is determined whether the vehicle is included in the image transmitted from the downstream monitoring camera, it is determined that the vehicle has passed, and if it is determined that the vehicle is not included, the vehicle is not passing And determining.

  As described above, according to the present invention, a plurality of surveillance cameras are installed from upstream to downstream in the direction of traffic in the tunnel across a section that is outside the imaging range of the imaging unit. The monitoring server receives images transmitted from a plurality of monitoring cameras, determines whether the received image includes a car, and transmits from the upstream monitoring camera among the plurality of monitoring cameras. If it is determined that a car is included in the captured image, it is determined whether or not a car is included in an image transmitted from a monitoring camera downstream from the upstream monitoring camera within a certain time from that point, and downstream monitoring is performed. When it is determined that a car is not included in the image transmitted from the camera, it is determined that the car has not passed. Therefore, a tunnel monitoring system that efficiently performs wide-area monitoring using a small number of monitoring cameras. , It is possible to provide a tunnel monitoring method.

It is a block diagram which shows the structural example of the tunnel monitoring system by one Embodiment of this invention. It is a figure which shows the example of installation of the some surveillance camera by one Embodiment of this invention. It is a figure which shows the example of the direct monitoring range and indirect monitoring range by one Embodiment of this invention. It is a figure which shows the example of the vehicle detection process by the vehicle detection part of one Embodiment of this invention. It is a figure which shows the example of the direct monitoring range and indirect monitoring range by one Embodiment of this invention. It is a flowchart which shows the operation example of the tunnel monitoring system by one Embodiment of this invention. It is a figure which shows the example of the direct monitoring range and indirect monitoring range by one Embodiment of this invention. It is a figure explaining the example of the abnormality detection process by one Embodiment of this invention. It is a figure explaining the example of the abnormality detection process by one Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a tunnel monitoring system 1 according to the present embodiment. The tunnel monitoring system 1 includes a plurality of monitoring cameras 10-N installed in a tunnel to be monitored and a monitoring server 20 connected to the plurality of monitoring cameras 10-N.

  The plurality of monitoring cameras 10-N are installed in a tunnel through which a vehicle passes and are separated from the upstream in the direction of traffic in the tunnel with a section outside the imaging range that can be imaged by a camera directed in a predetermined direction. Installed downstream. In the present embodiment, the plurality of monitoring cameras 10-N are separated from the indirect monitoring range that is outside the imaging range when the camera is fixed without swinging but is within the imaging range when the camera is swung. Thus, it is installed from upstream to downstream in the direction of traffic in the tunnel.

  For example, FIG. 2 is a diagram illustrating an installation example of a plurality of monitoring cameras 10-N according to the present embodiment. Here, the monitoring camera 10-1, the monitoring camera 10-2, and the monitoring camera 10-3 are installed at a predetermined interval above the tunnel. For example, the location indicated by reference numeral a1 is a section of the direct monitoring range that is within the imaging range when the monitoring camera 10-1 is fixed without swinging, and the location indicated by reference sign b1 is swung by the monitoring camera 10-1. This is a section of the indirect monitoring range that is within the imaging range in the state of having performed. The imaging range is a range in which a passing vehicle can be effectively monitored in the range captured by the monitoring camera 10-N. Here, the indirect monitoring range indicated by reference sign b1 is divided into a section (reference sign b1-1) monitored by the swinging motion by the monitoring camera 10-1 and a section monitored by the swinging action by the monitoring camera 10-2 (reference sign b1). -2), a plurality of surveillance cameras 10-N may be installed with an interval divided into two sections. Although three monitoring cameras are illustrated and described here, a wide range over the entire tunnel may be monitored by a direct monitoring range or an indirect monitoring range by a plurality of monitoring cameras 10-N. For example, FIG. 3 shows an example in which a wide range from upstream to downstream in the traffic direction in the tunnel of a car is monitored by 6 direct monitoring ranges and 5 indirect monitoring ranges.

Here, since the plurality of monitoring cameras 10-N have the same configuration except that the installation positions are different, the monitoring cameras 10-N will be described as the monitoring cameras 10 unless otherwise distinguished. Returning to FIG. 1, the monitoring camera 10 includes an imaging unit 11, a swing drive unit 12, and a transmission unit 13.
The imaging unit 11 is a camera including a lens, an imaging element, and the like, and generates an image by imaging the inside of the tunnel. In the normal state, the imaging unit 11 directly captures an image with a fixed monitoring range, but captures an indirect monitoring range by the operation of the swing drive unit 12. Here, the imaging unit 11 has a function of receiving a control signal including a value indicating an enlargement ratio or a reduction ratio and performing zoom-in and zoom-out of the imaging range in accordance with the received control signal.

  The swing drive unit 12 performs a pan / tilt / zoom swing operation of the imaging unit 11 so as to capture an indirect monitoring range in response to an input swing request. Here, the swing drive unit 12 receives a control signal including a value indicating an angle determined according to the imaging direction of the imaging unit 11, and swings the imaging unit 11 according to the received control signal. I do. For example, the swing drive unit 12 of the monitoring camera 10-1 in FIG. 2 performs a swing operation so that each section of the reference numerals b1-1 and b1-2 that are the indirect monitoring range of the monitoring camera 10-1 is the imaging range. The head swing angle is stored in advance, and when a head swing request is received from the monitoring server 20, a head swing operation is performed based on the head swing angle stored in advance. In addition, after performing the swing operation, after the indirect monitoring range is imaged by the imaging unit 11, the swing operation is performed so that the imaging range of the imaging unit 11 directly returns to the monitoring range.

  The transmission unit 13 transmits the image captured by the imaging unit 11 to the monitoring server 20. Here, the transmission unit 13 is a camera identification information for identifying itself among the plurality of monitoring cameras 10 in the tunnel, or an image in which the image to be transmitted is an image obtained by directly imaging the monitoring range or an image obtained by imaging the indirect monitoring range. Information indicating whether or not there is can be transmitted together with the image. Alternatively, for example, unique identification information for each monitoring range in the tunnel including the direct monitoring range and the indirect monitoring range is determined in advance and stored in the storage area of the monitoring camera 10, and the monitoring range identification for identifying the captured monitoring range The information may be transmitted together with the image.

The monitoring server 20 includes a receiving unit 21, a first car detection unit 22, a background image storage unit 23, a second car detection unit 24, a passage determination unit 25, a swing request transmission unit 26, a warning A unit 27 and an output unit 28 are provided.
The receiving unit 21 receives images transmitted from the plurality of monitoring cameras 10.
The first vehicle detection unit 22 monitors a vehicle included in the image of the direct monitoring range that is imaged at normal time. Here, the first car detection unit 22 performs a car detection process for determining whether a car is included in the image captured by the monitoring camera 10. For example, the first vehicle detection unit 22 appropriately generates a background image in real time, and compares the difference between the generated background image and the captured image generated by the monitoring camera 10, thereby including the vehicle in the captured image. It is determined whether or not. Specifically, for example, the first car detection unit 22 calculates an average value for each pixel included in the captured image captured by the monitoring camera 10 at a predetermined time, and calculates the calculated average value and the determination target. Calculate the size of the pixel area where the value difference with the pixel included in the captured image is greater than or equal to a certain value, and determine that the size of the pixel area with the value difference is greater than or equal to a certain value Then, it determines with having detected the vehicle. Here, even when the captured image includes a plurality of lanes, the first vehicle detection unit 22 can also acquire the passing situation in the up and down directions by performing a tracking process or the like.

  In the background image storage unit 23, a background image that is an image that does not include a car in the imaging range of the monitoring camera 10 is stored in advance in association with each of the plurality of monitoring cameras 10. The background image is, for example, an image as shown in the lower part of FIG. Here, the background image stored in the background image storage unit 23 is a background image in the indirect monitoring range. For example, unique identification information is predetermined for each indirect monitoring range in the tunnel, and a background image is stored in association with each such monitoring range identification information.

  The second vehicle detection unit 24 monitors a vehicle included in the image of the indirect monitoring range imaged when swinging. Here, the second vehicle detection unit 24 performs a vehicle detection process for determining whether or not a vehicle is included in the image received by the reception unit 21. The second vehicle detection unit 24 does not perform a process such as generating a background image in real time in order to prevent a long processing time from being performed by performing an advanced comparison process. The vehicle detection process is performed by comparing the background image stored in the unit 23 with the still image captured by the surveillance camera 10 that has performed the swing motion. That is, in the indirect monitoring range, several still images are captured to complete the imaging, and the monitoring camera 10 is returned to the normal state. As a result, it is possible to reduce the time and load for performing the swing operation to image the indirect monitoring range, and to quickly return to the normal state monitoring. Specifically, the second vehicle detection unit 24 reads the background image stored in the background image storage unit 23 in association with the monitoring camera 10 that transmitted the image, the read background image, and the monitoring camera. Whether the image transmitted from the monitoring camera 10 includes a car based on the difference between the image captured from the background image captured in advance and the image transmitted from the monitoring camera 10. Determine. Here, for example, the second vehicle detection unit 24 reads a background image corresponding to the monitoring range identification information transmitted from the monitoring camera 10 together with the image from the background image storage unit 23 and performs a vehicle detection process.

For example, FIG. 4 is an example of an image in which the upper image is transmitted from the monitoring camera 10, and an example of a background image in which the lower image is captured in advance and stored in the background image storage unit 23. In the case of the code (a), since the image transmitted from the monitoring camera 10 matches the background image captured in advance, the second vehicle detection unit 24 determines that the vehicle is not included. In the case of the code (b), the image transmitted from the monitoring camera 10 has a region different from the background image captured in advance. The second vehicle detection unit 24 detects such a difference area of the image, compares the size of the detected area with a predetermined threshold value, and if the detected difference area size is equal to or larger than the threshold value. For example, it is determined that the image transmitted from the monitoring camera 10 includes a car. Similarly, in the case of the code (c), the difference between the image transmitted from the monitoring camera 10 and the background image captured in advance is detected. If the detected difference area is equal to or larger than the threshold value, the image is transmitted from the monitoring camera 10. It is determined that a car is included in the captured image.
In addition, when the images of a plurality of indirect monitoring ranges are transmitted from the monitoring camera 10, the second vehicle detection unit 24 has a vehicle in any of the indirect monitoring ranges. Detect whether or not

  Returning to FIG. 1, when it is determined by the first vehicle detection unit 22 that the image transmitted from the upstream monitoring camera 10 among the plurality of monitoring cameras 10 includes a vehicle, the passage determination unit 25 The first vehicle detection unit 22 determines whether or not a vehicle is included in an image transmitted from the monitoring camera 10 downstream of the upstream monitoring camera 10 within a certain time from the upstream monitoring camera 10, and the downstream monitoring camera 10 When it is determined that the vehicle is included in the image transmitted from the vehicle, it is determined that the vehicle has passed, and when it is determined that the vehicle is not included, the vehicle passage determination process that determines that the vehicle has not passed is performed. .

  For example, the passage determination unit 25 previously stores identification information of the plurality of monitoring cameras 10 and information indicating the positional relationship between the upstream and downstream of the plurality of monitoring cameras 10 in its own storage area. And if the 1st vehicle detection part 22 determines with the passage determination part 25 having detected the vehicle from the image transmitted from the monitoring camera 10, it will be in the image transmitted from the monitoring camera 10 downstream from the monitoring camera 10. The first vehicle detection unit 22 determines whether or not a vehicle is included. The passage determination unit 25 has a timekeeping function, and measures an elapsed time from the time when the first vehicle detection unit 22 determines that a vehicle has been detected from the image transmitted from the monitoring camera 10. The passage determination unit 25 is a period from when the first vehicle detection unit 22 determines that a vehicle is detected from the image transmitted from the monitoring camera 10 until a predetermined time (for example, a set time of 1 minute) elapses. If it is determined that the vehicle is included in the image transmitted from the downstream monitoring camera 10, it is determined that the vehicle has passed. If it is determined that the car is not included, it is determined that the car has not passed. Here, the elapsed time measured by the passage determination unit 25 is set to an optimum value according to the length of the tunnel, the distance between the installation positions of the monitoring cameras 10, the detected vehicle speed, the number of lanes, and the like. good.

  That is, for example, as shown in FIG. 5, it is assumed that the interval between the detection point in the direct monitoring range a1 of the monitoring camera 10-1 and the detection point in the direct monitoring range a2 of the monitoring camera 10-2 is 500 m. At this time, when a vehicle is detected from an image captured by the monitoring camera 10-1, the passage determination unit 25 stores the passage time. In the direct monitoring range of the monitoring camera 10-2, when no vehicle is detected for a set time or more from the passing time of the monitoring camera 10-1 (when the vehicle does not pass), some abnormality occurs in the indirect monitoring range. Can be considered. As a result, it is possible to determine whether or not an abnormality has occurred in the tunnel without always comprehensively monitoring all locations in the tunnel. Here, as the set time, for example, a time longer than a time required for a vehicle at a normal speed to pass the passing detection point is set. For example, when the interval between detection points is 500 m and the average vehicle speed is 60 km per hour, it takes 30 seconds to elapse 500 m, so a longer time is set.

  Returning to FIG. 1, when the passage determination unit 25 determines that the vehicle has not passed, the swing request transmission unit 26 sends a head to at least one of the upstream monitoring camera 10 and the downstream monitoring camera 10. A swing request that requests to perform imaging of the indirect monitoring range by performing a swing operation is transmitted to cause the monitoring camera 10 to perform the swing operation and to image the indirect monitoring range. Here, whether the swing request transmission unit 26 transmits the swing request to the upstream monitoring camera 10 or the downstream monitoring camera 10 may be determined in advance according to the interval between the monitoring ranges. it can. Here, the swing request may be transmitted to both the upstream monitoring camera 10 and the downstream monitoring camera 10.

  The warning unit 27 outputs a warning when the passage determination unit 25 determines that a vehicle has not passed or when the second vehicle detection unit 24 determines that a vehicle is present. For example, the warning unit 27 notifies a predetermined external device or the like of information indicating that the vehicle is not passing through the specific monitoring camera 10 or information indicating in which indirect monitoring range the vehicle is present. . Alternatively, the warning unit 27 has an e-mail transmission function, and indicates that there is a possibility that an abnormality has occurred because the car has not passed through the specific monitoring camera 10 in the monitoring target tunnel. An e-mail including a sentence is transmitted to a predetermined destination.

  The output unit 28 outputs an image of the indirect monitoring range captured by the monitoring camera 10 in response to the swing request from the swing request transmission unit 26 received by the receiving unit 21. The output unit 28 has an e-mail transmission function, for example, and transmits an e-mail including an image in the indirect monitoring range to a predetermined destination. Here, the email sent by the warning unit 27 and the email sent by the output unit 28 may be a single email. Alternatively, for example, the monitoring server 20 may include a display, and a warning by the warning unit 27 and an image by the output unit 28 may be output to the display included in the monitoring server 20.

Next, an operation example of the tunnel monitoring system 1 according to the present embodiment will be described. FIG. 6 is a flowchart illustrating an operation example in which the tunnel monitoring system 1 according to the present embodiment issues a warning when an abnormality occurs.
Here, a monitoring camera 10-1 that is a relatively upstream monitoring camera 10 and a monitoring camera 10-2 that is a relatively downstream monitoring camera 10 will be described as examples. All the monitoring cameras 10 installed in the tunnel continue to transmit an image obtained by directly capturing the monitoring range to the monitoring server 20 (step S1, step S2). When the receiving unit 21 of the monitoring server 20 receives an image transmitted from the monitoring camera 10, the first car detection unit 22 performs a vehicle detection process for each of the received images (step S3).

  When the first vehicle detection unit 22 of the monitoring server 20 determines that no vehicle is included in all the images transmitted from the plurality of monitoring cameras 10 (step S3: NO), the vehicle passage determination process or the like is not performed. The vehicle detection process by the first vehicle detection unit 22 is continued until a vehicle is detected. When the first vehicle detection unit 22 of the monitoring server 20 determines that a vehicle is included in any of the images transmitted from the plurality of monitoring cameras 10 (step S3: YES), the passage determination unit 25 determines whether the vehicle is passing. Processing is performed (step S4). That is, the passage determination unit 25 applies an image transmitted from the monitoring camera 10 (for example, the monitoring camera 10-2) downstream from the monitoring camera 10 (for example, the monitoring camera 10-1) in which the vehicle is detected in Step S3. The first vehicle detector 22 determines whether or not a vehicle is included, and determines whether or not the vehicle has passed.

  Here, if the passage determination unit 25 determines that the vehicle has passed (step S4: YES), the vehicle detection processing by the first vehicle detection unit 22 is performed until the vehicle is detected without performing the swing request transmission processing or the like. Continue. If the passage determination unit 25 determines that the vehicle has not passed (step S4: NO), the swing request transmission unit 26 transmits a swing request for requesting imaging of the indirect monitoring range to the monitoring camera 10 ( Step S5). Here, an example is shown in which the swing request is transmitted to the monitoring camera 10-1, but the swing request may be transmitted to both the monitoring camera 10-1 and the monitoring camera 10-2. When the monitoring camera 10-1 receives the swing request transmitted from the monitoring server 20, the swing drive unit 12 performs the swing operation of the imaging unit 11 so as to capture the direction of the defined indirect monitoring range. It performs (step S6). When the imaging unit 11 captures an image in the indirect monitoring range, the transmission unit 13 transmits the captured image to the monitoring server 20 (step S7).

  The second vehicle detection unit 24 of the monitoring server 20 reads the background image corresponding to the indirect monitoring range stored in the background image storage unit 23 in advance, and compares it with the received image of the indirect monitoring range. Determine where the car is in the monitored area. The monitoring server 20 outputs a warning indicating that a car is not passing through the tunnel and that some abnormality may have occurred, and an image transmitted from the monitoring camera 10-1 in step S7. . Furthermore, you may make it output the monitoring range identification information which identifies the indirect monitoring range from which the vehicle was detected. For example, a warning and an image are output to a display provided in the device, and an e-mail is transmitted to a predetermined destination (step S8). Then, the swing drive unit 12 of the monitoring camera 10-1 performs a swing operation so that the imaging unit 11 directly images the monitoring range, and returns to a normal monitoring state.

  In the above, an example in which the occurrence of an abnormality is detected by determining whether or not a vehicle is detected in the downstream monitoring camera 10 within a certain time after a vehicle is detected in the upstream monitoring camera 10 has been shown. . However, depending on the brightness of the direct monitoring range in the tunnel, the speed of the car, the performance of the monitoring camera 10, etc., it is possible that not all the monitoring cameras 10 can always detect all the vehicles that pass the direct monitoring range. It is done. Therefore, in consideration of such omissions in vehicle detection, the vehicle detection results of all the monitoring cameras 10 are evaluated based on the integration results within a predetermined time to determine whether or not an abnormality has occurred. Also good.

  For example, as shown in FIG. 7 (a), the monitoring camera 10 is installed at six locations (a1, a2, a3, a4, a5, a6) in a tunnel having a total length of 2000 m to directly monitor the monitoring range. Think. Here, the traffic flow of the entire tunnel is determined whether or not a vehicle is detected every minute, and whether or not the vehicle has passed downstream is monitored at intervals of 3 minutes. That is, if a vehicle is detected upstream but no vehicle is detected downstream, it is determined that there is an abnormality. Such a duration time interval sets a time longer than the time required for the car to pass through the entire tunnel (2000 m). For example, in this example, assuming that the average speed of the car is 60 km and it takes 2 minutes to pass 2000 m, the duration interval is set to 3 minutes longer than that. For example, when there is no abnormality, as shown in (b), the passage of the vehicle is detected in all six direct monitoring ranges. On the other hand, as shown in (c), when an abnormality occurs in the section between the direct monitoring ranges of the symbols a4 and a5 and the passage becomes impossible, in the direct monitoring range from the symbols a1 to a4, A vehicle is detected, but no vehicle is detected in the direct monitoring range from the symbol a5 to the symbol a6.

  FIG. 8 is a diagram for explaining the outline of such an abnormality detection process. Here, as shown in FIG. 7, it is a diagram showing in time series whether or not the vehicle has passed through the respective direct monitoring ranges (reference numerals a1 to a6) installed at six locations. In this figure, “◯” indicates that the vehicle has passed, and “X” indicates that the vehicle has not passed. For example, during one minute from 10:00 to 10:00:59, the vehicle passes through the direct monitoring range between the reference a1 and the reference a2, and the direct monitoring range between the reference a3 and the reference a6. Indicates that the car did not pass. Here, it is assumed that an abnormality occurred in the section between the direct monitoring range of the reference sign a4 and the reference sign a5 between 10:05:00 and 10:05:59, and the passage is impossible. For this reason, the passage of the vehicle is detected at a4 from 10:06:00 to 10:06:59, but no vehicle is detected in the section downstream from the a5 after that time. Looking at the integration result for 3 minutes, between 10:04:00 and 10:06:59, the passage of the vehicle is detected in the direct monitoring range of the sign a4 which is relatively upstream, A vehicle is not detected in the section of the direct monitoring range (references a5, a6) downstream from this. Therefore, at this time, it is determined that an abnormality has occurred in the section between the code a4 and the code a5.

  Similarly, FIG. 9 is a diagram illustrating determination when one vehicle passes through the tunnel at a speed of 60 km / h. In this case, the car passes 2000 m at a speed of 16.7 m per second, and travels in 2000 m in about 2 minutes. Therefore, the car sequentially passes through the direct monitoring range of symbols a1 to a6. All the integration results are “passed”, and it is determined that there is no abnormality.

  In the present embodiment, the first car detection unit 22 generates a background image in real time to perform car detection processing, and the second car detection unit 24 is captured in advance and stored in the background image storage unit 23. Although the vehicle detection process based on the still image is performed using the background image, any of them may perform the vehicle detection process based on the real time or the vehicle detection process based on the still image.

  In the present embodiment, the monitoring server 20 performs a vehicle detection process of detecting a vehicle by comparing a background image captured in advance with an image captured in real time by the imaging unit 11 of the monitoring camera 10. However, when the monitoring camera 10 detects a car by providing the monitoring camera 10 with the same functional units as the first vehicle detection unit 22, the background image storage unit 23, and the second vehicle detection unit 24, You may make it transmit the vehicle detection notification signal which shows having detected the vehicle with respect to the monitoring server 20. FIG. In this case, the passage determination unit 25 of the monitoring server 20 can determine whether the vehicle has passed by determining whether or not a vehicle detection notification signal is transmitted from the downstream monitoring camera 10 within a certain time. .

In addition, the vehicle passage determination by the passage determination unit 25 may be performed in real time, or a log in which the result of the vehicle detection processing by the first vehicle detection unit 22 is associated with the time and the like is stored, and a certain time Each time, a pass determination process may be performed afterwards.
The first vehicle detection unit 22 counts the number of vehicles that have passed in the direct monitoring range, and the passage determination unit 25 determines whether an abnormality has occurred based on the number of vehicles that have passed. It may be determined.

  As described above, according to the present invention, even if a surveillance camera is not installed so as to comprehensively capture the inside of the tunnel, the surveillance camera installed at a predetermined interval is normally outside the imaging range. Even when an abnormality occurs in a section between the monitoring camera and the monitoring camera, the abnormality can be detected. In addition, the surveillance camera always monitors the direct monitoring range, and if it is estimated that some abnormality has occurred between the surveillance cameras, it is less by panning, tilting and zooming the camera to image the indirect monitoring range and monitoring A wide range of monitoring in the tunnel can be performed using a number of monitoring cameras.

  The program for realizing the function of the processing unit in the present invention is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into the computer system and executed to monitor the tunnel. You may go. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer system” includes a WWW system having a homepage providing environment (or display environment). The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” refers to a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.

  The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

DESCRIPTION OF SYMBOLS 1 Tunnel monitoring system 10 Monitoring camera 11 Imaging part 12 Swing drive part 13 Transmission part 20 Monitoring server 21 Reception part 22 1st vehicle detection part 23 Background image memory | storage part 24 2nd vehicle detection part 25 Passing determination part 26 Swing Request transmission unit 27 Warning unit 28 Output unit

Claims (4)

A tunnel monitoring system including a plurality of monitoring cameras installed in a tunnel through which a vehicle passes and having an imaging unit that images the inside of the tunnel, and a monitoring server connected to the plurality of monitoring cameras,
The plurality of surveillance cameras include a direct monitoring range that is a range for imaging in a normal state and an indirect monitoring range that is outside the direct monitoring range for imaging in response to an input imaging range change request. Are installed from upstream to downstream in the direction of traffic in the tunnel, with the indirect monitoring range being separated from each other,
Each of the plurality of surveillance cameras is
A drive unit that drives the imaging unit so that a range captured by the imaging unit is changed from the direct monitoring range to the indirect monitoring range in response to the input imaging range change request;
A transmission unit that transmits the captured image to the monitoring server, and in a normal state, transmits an image captured using the direct monitoring range as an imaging target to the monitoring server;
The monitoring server is
A receiving unit for receiving the images transmitted from the plurality of monitoring cameras;
A first vehicle detection unit for determining whether or not a vehicle is included in the image obtained by imaging the direct monitoring range received by the reception unit;
When the first vehicle detection unit determines that the image includes a vehicle, the monitoring camera that has transmitted the image determined to include the vehicle within a certain time from the time point and the indirect monitoring range The first vehicle detection unit determines whether or not a vehicle is included in the image transmitted from the downstream monitoring camera installed at a distance, and the vehicle transmitted from the downstream monitoring camera When it is determined that the vehicle is included, it is determined that the vehicle has passed, and when it is determined that the vehicle is not included, the passage determination unit that determines that the vehicle has not passed,
By the passage determination unit, if the vehicle is determined not to be passed, prior Symbol upstream of the direct monitoring range downstream of the monitoring camera to transmit the imaging range change request of the downstream surveillance camera captures A request transmission unit that images the indirect monitoring range,
An output unit that outputs an image of the indirect monitoring range that is received in response to the imaging range change request received by the receiving unit;
A tunnel monitoring system comprising: The monitoring server is
When the passage determination unit determines that the vehicle has not passed, a warning unit that outputs a warning;
The tunnel monitoring system according to claim 1, comprising: For each of the plurality of monitoring cameras, a background image storage unit that is stored in advance in association with a background image that is an image that does not include a car in the indirect monitoring range;
Compared to the background image stored in the background image storage unit, the image and the background of the image of the indirect monitoring range imaged in response to the imaging range change request transmitted from the monitoring camera A second vehicle detection unit that determines whether or not a vehicle is included in the image based on a difference from the image;
The tunnel monitoring system according to claim 1, further comprising: A tunnel monitoring method of a tunnel monitoring system, which is installed in a tunnel through which a vehicle passes and includes a plurality of monitoring cameras including an imaging unit that images the inside of the tunnel, and a monitoring server connected to the plurality of monitoring cameras. There,
Each of the plurality of monitoring cameras includes a direct monitoring range that is an image capturing range in a normal state, and an indirect monitoring range that is outside the direct monitoring range imaged in response to an input imaging range change request. as the entire range is monitored, are each the indirect monitoring range at a multiple surveillance cameras from the upstream passage direction disposed over the downstream in said tunnel,
Transmitting an image obtained by imaging the direct monitoring range as an imaging target in a normal state to the monitoring server;
The monitoring server is
Receiving the images transmitted from the plurality of surveillance cameras;
Determining whether a vehicle is included in the received image of the direct monitoring range ; and
When it is determined that a vehicle is included in the image, the monitoring camera that has been installed across the indirect monitoring range from the monitoring camera that has transmitted the image determined to include the vehicle within a certain time from the time point. It is determined whether or not a vehicle is included in the image transmitted from the camera, and when it is determined that the vehicle is included in the image transmitted from the downstream monitoring camera, it is determined that the vehicle has passed. If it is determined that the vehicle is not included, the step of determining that the vehicle has not passed;
If the vehicle is determined not to pass through an imaging indirect monitoring range is upstream of the direct monitoring range before Symbol downstream of monitoring the in camera transmits an imaging range change request of the downstream surveillance camera captures Step to
The surveillance camera that has transmitted the imaging range change request,
In response to the imaging range change request, driving the imaging unit so that a range captured by the imaging unit is changed from the direct monitoring range to the indirect monitoring range on the upstream side ;
The monitoring server is
Outputting an image of the indirect monitoring range on the upstream side imaged in response to the imaging range change request;
A tunnel monitoring method comprising:

Images