JP2023109362A - Traffic operation monitoring system - Google Patents

Abstract

To provide a traffic operation monitoring system which reduces the effect of a traffic incident that affects vehicle operation in spots, such as a platform or a railroad crossing, or a bridge or tunnel of a national highway/expressway.SOLUTION: A method includes: imaging, by a monitoring camera 100, a high-definition video at a monitoring spot of a railroad or an expressway; converting video electric signals output from the monitoring camera to optical signals without delay through an optical transmitter 101; and transmitting the signals to a remote place through an optical transmission path including optical fibers 120-122 with low delay. In the remote place, optical receivers 103, 104 convert the transmitted optical signals into video electric signals without delay. The signals are presented by a surveillance monitor 105 to a monitoring person and simultaneously applied to an image analyzer 106 to detect the presence/absence of a risk event. When the risk event is detected, an alarm signal is automatically issued. The alarm signal is transmitted to the monitoring spot and issued from an alarm emitter.SELECTED DRAWING: Figure 2

Description

The present invention is a surveillance system that uses a surveillance camera to monitor points such as buildings, public facilities, transportation facilities, rivers, embankments, and other civil engineering disaster hazard map locations through a surveillance monitor. Regarding the system, it is possible to reduce the impact of situations that may hinder vehicle operation, especially at points such as railway platforms, railroad crossings, highway national highways and highways, and tunnels. It relates to a traffic operation monitoring system.

Conventional surveillance systems are broadly divided into analog systems, which transmit images of monitored points as analog electrical signals, and digital systems, which convert them into digital signals and transmit them via IP networks. Figure 1 shows these concepts. In FIG. 1, 1 is an analog surveillance camera, 2 is an analog surveillance monitor, 3 is a coaxial cable connecting the surveillance camera 1 and the surveillance monitor 2, 4 is the supervisor of the surveillance monitor 2, and 5 is A digital surveillance camera, 6 is an encoder that compresses the video data capacity of the surveillance camera 5, 7 is a decoder that restores it, 8 is a digital surveillance monitor, 9 is an IP network, and 10 is a surveillance camera 1. and encoder 6, 11 is a cable connecting encoder 6 and IP network 9, 12 is a cable connecting IP network 9 and decoder 7, 13 is a cable connecting decoder 7 and monitor 8, 14 is A supervisor of the monitor 8 for monitoring.

The analog system complies with the NTSC system of television, and the image on the imaging device of the surveillance camera 1 is scanned in order and read out. The image is displayed by scanning the top in order. Therefore, delay is unlikely to occur in principle, and it is suitable for the purpose of transmitting video with an extremely short delay time, that is, a small latency.

On the other hand, the digital method, which is becoming mainstream at present, transmits digital image data captured by the monitoring camera 5 frame by frame via an IP network 9 such as the Internet via Ethernet and a router. Compared to the conventional analog method, full HD image quality (1980 x 1080 pixels), 4K image quality or Ultra HD (3840 x 2160 pixels) high-quality images, screen ratio 16: 9, diagonal 43 inches or 55 inches or more It is possible to transmit to a large-screen monitor of the same size via an IP network9.

Patent Document 1 discloses a device for compression encoding using a digital method. Compression encoding increases the delay time during transmission, but in order to shorten the delay time, the imaging direction and imaging range are limited, and a wide range of images cannot be handled.

Patent Document 2 shows the use of IP networks for monitoring railway station platforms. In order to reduce the amount of data, the entire camera image is not transmitted and displayed, but the target range is limited, so the amount of information captured by the camera is reduced.

Non-Patent Document 1 states that high-definition monitoring cameras are a necessary condition for surveillance systems in general, but does not disclose low-delay transmission.

JP-A-2003-284051 Japanese Patent Application Laid-Open No. 2020-184767

Ichiro Ote, Naoyuki Shinbo, Tatsuhiko Kagehiro, Seiya Ito, “Latest Trends in Video Surveillance Systems,” Hitachi Hyoron December 2009, pp. 54-59.

Monitoring systems are widely used by transportation operators, and in the case of railways, they are used to monitor trains entering the platform, opening and closing of train doors and platform doors, and the flow of passengers on crowded platforms. Full HD (1980 x 1080 pixels) and 4K (3840 x 2160 pixels) high-definition images are displayed on large screen monitors with a screen ratio of 16:9 and a diagonal of 43 inches, 55 inches or more for safety monitoring. There is a growing need for transmission with as little latency as possible.

In the case of the conventional analog system, video transmission with extremely low latency is possible because the transmission conforms to the NTSC system. 240 pixels), VGA image quality (640 x 480 pixels), and D1 image quality (740 x 480 pixels). For this reason, there is also a problem that it is difficult to increase the size of the screen.

On the other hand, a digital IP network camera compresses image frame data using an encoder to reduce the transmission capacity so as not to overload the line, then divides the data into packets and transmits them via the IP network. . Packets flowing over IP networks require buffering processing to avoid collisions at switches or routers, and queuing delays occur. As a result, it is difficult to have packets arrive at the transmission destination at uniform timing. In addition, it takes time to restore the compressed image data by the decoder. As a result, although it is possible to obtain high-definition, large-screen images compared to analog systems, the latency of video transmission tends to increase significantly from several hundred milliseconds to several seconds.

The purpose of the present invention is to provide transportation operators with a video transmission latency of several tens of milliseconds even from a remote location, including imaging and display, for monitoring targets that may interfere with operation during vehicle operation and when passengers get on and off. and to provide a traffic operation monitoring system that enables monitoring with ultra-low-delay, high-definition, large-screen video, and that can promptly issue a warning as necessary.

An example of applying the means for solving the problems of the conventional method to railways will be described.

Details are shown in FIG. In Figure 2, 100 has a color depth of 4:2:0/8 bits, an effective pixel count of 4K (3840 x 2160 pixels), and a frame rate of 60 frames per second. 4K surveillance camera, 101 is an optical transmitter that converts the output signal of the 4K surveillance camera into an uncompressed optical signal with a wavelength of 1550 nm, 102 is an optical splitter that divides the optical signal into two, and 103 and 104 are for 4K surveillance. An optical receiver installed at a different location from the camera that converts the received uncompressed optical signal into a 4K video signal. Monitor for monitoring, 106 is an image analysis device with machine learning or deep learning function of video acquired from 4K video, 110, 111, 112 are metal cables such as HDMI (HDMI is a registered trademark, the same applies hereinafter) cable, 120, 121 , 122 is a single-mode optical fiber, 130 is a station attendant who monitors the 4K surveillance monitor 105, and 131 and 132 are the vicinity of the point where the 4K surveillance camera 100 is installed from at least one of the station attendant 130 or the image analysis device 106. Alternatively, an alarm signal issued to the railway operation control center, 133 is an alarm issuing device.

In the example of FIG. 2, the output signal of the 4K surveillance camera 100, which outputs a data transmission amount of several gigabits/second to 10 gigabits/second, is sent to the optical transmitter 101 via a metal cable 110 such as an HDMI cable, and is serially uncompressed. converted into an optical signal. An uncompressed optical signal is transmitted to the optical splitter 102 through the optical fiber 120 and split into two. Furthermore, it is transmitted to railway facilities via optical fibers 121 and 122, reconverted to 4K video at 60 frames/second by optical transmitters 103 and 104, and then displayed on 4K monitoring monitor 105 and image analysis equipment 106. necessary analysis and recording are performed. When the image analysis device 106 detects danger, an alarm signal 132 is issued and an alarm issuing device 133 is activated, thereby preventing an accident. In addition, when the station attendant 130 detects an abnormality from the video on the 4K monitoring monitor 105, the alarm signal 131 can be used to activate an alarm issuing device to prevent an accident.

As a result, when transmitting 4K surveillance camera images to a 4K surveillance monitor via conventional IP network transmission, the image transmission delay was approximately 500 milliseconds. can be reduced to about 30 ms.

As a result, for example, when passengers rush to get on a crowded station platform and there is a sign of baggage getting caught at the railroad car door or platform door, high-definition, large-screen 4K monitoring in the station office or platform will be possible. Since multiple station staff and conductors can view the monitor, a situation such as baggage getting caught in the door of a railway car or platform door occurs, and the door cannot be reopened before the sensor is activated or the emergency stop button on the platform is activated. As a result, it becomes possible to operate railway vehicles on time. In addition, even in the unlikely event that a situation that hinders operation occurs, it is possible to quickly operate the alarm issuing device 133 for station staff to rush to the spot and stop the following vehicle.

In addition, the image analysis device 106 repeatedly learns situations that the station attendant 130 judges to be urgent, so that the image analysis device 106 informs the relevant station or the railway operation control center of the railway vehicle door opening, departure stop, and emergency stop of the following vehicle. It is also possible to automatically issue an operation signal such as

It is drawing explaining the concept of the conventional monitoring system. It is drawing explaining the concept of this invention. FIG. 4 is a drawing for explaining an example of monitoring one point of railway facilities from multiple points according to the present invention. FIG. FIG. 4 is a drawing explaining an example of monitoring multiple points of railway facilities from one point using an optical switch in the present invention. FIG. 4 is a drawing for explaining an example of monitoring multiple points on an expressway from one point using optical fiber wavelength division multiplexing transmission technology; FIG.

In the first embodiment of the present invention, an example of monitoring one point of a railway facility from multiple points will be described below with reference to FIG. 3, 200 is a railway line, 201 is a railway station, 202 and 203 are stations adjacent to station 201, 204, 205 and 206 are station offices of stations 201, 202 and 203, 207 is the platform of station 201, 208 is A platform door on the platform 207, 209 is a railroad car entering the platform 207, and 210 is a passenger on the platform 207.

The 211 was installed on platform 207 with a color depth of 4:2:0/8 bits, a frame rate of 60 frames/second, a data transmission rate of several gigabits/second to 10 gigabits/second, and sensitivity to near-infrared light. 212 is the following railroad car, 213 is the traveling direction of the railroad car 212, and 220 is for the 4K surveillance camera. Uncompressed optical transmitter (DPN9042B, manufactured by Optical Path Communications Co., Ltd.), 221 is an optical splitter (DPN9049A, manufactured by Optical Path Communications Co., Ltd.) that divides the optical signal into 8 parts, and 230, 231, 232, 233, and 234 are optical fibers. 4K uncompressed optical receiver (DPN9044A, manufactured by Hikari Path Communications Co., Ltd.) that converts uncompressed optical video signals transmitted via the station into video signals for 4K surveillance monitors and image analysis equipment. 16:9 screen ratio, 55 inch diagonal, digital 4K surveillance monitor installed in offices 204, 205, 206, 243 installed on platform 207, 16:9 screen ratio, 43 inch diagonal, Digital 4K surveillance monitor, 244 is HDMI cable connecting 4K surveillance camera 211 and optical transmitter 220, 250, 251, 252, 253 are optical receivers 230, 231, 232, 233 and 4K surveillance monitors 240, 241 , 242 and 243, an HDMI cable that connects 242 and 243, 260 is an image analysis device that is installed at a railway operation command center and has a machine learning or deep learning function for emergency situations using 4K video, and 254 is an optical receiver 234 and an image analysis device 260. 270 is a single-mode optical fiber that connects the optical transmitter 220 and the optical splitter 221; 271, 272, 273, and 274 are single-mode cables that connect the optical splitter 221 and the optical receivers 230, 231, 232, and 233 An optical fiber 275 is a single-mode optical fiber that connects the optical distributor 221 and the image analysis device 260. 280, 281, and 282 are station attendants that monitor the 4K monitoring monitors 240, 241, and 242.

Conventionally, when the passenger 210 rushes to the railroad car 209 and attempts to get on, for example, if a situation occurs in which the passenger 210 is caught between the door of the railroad car 209 or the platform door 208, a sensor provided in the door detects this and opens the door. Station staff on platform 207 and station office 204, and the conductor of railroad car 209 confirmed the safety of passengers visually or on the monitoring monitor on platform 207, and resumed operation. When confirming the safety of the platform via the network, the resolution of the analog method is not sufficient, and the IP network camera has a problem that it is difficult to respond quickly due to the large transmission delay of the image. Furthermore, when the morning and evening schedules were congested, slight delays in service at each station caused major disruptions to the railway schedule.

On the other hand, according to the railway operation monitoring system of the present invention, it is possible to monitor the platform 207 with the monitoring monitor 240, 243 video with a video delay of about 30 milliseconds and 4K high image quality and large screen. When a situation related to the operation as described above occurs, the station staff on the platform 107 and the conductor of the railway car 109 can quickly find it through the 4K monitoring monitor 243 and respond quickly. rice field. In addition, it is possible to monitor the platform 107 from the adjacent stations 202 and 203 via the monitoring monitors 241 and 242 with a video delay of about 30 milliseconds and 4K high image quality and large screen. Staff are stationed at the railway stations 202 and 203, and in the event of a situation related to safe operation on the platform 207 of the railway station 201, the station staff on the platform 207 of the railway station 201 is notified by means of radio, etc. It was possible to make an emergency response by reporting to the station, and it was possible to allocate station staff rationally.

When the image analysis device 260 detects a dangerous event, an alarm signal is issued and an alarm issuing device is activated, thereby preventing an accident. In addition, it was also possible for a station attendant who sensed an abnormality from the screens of the monitoring monitors 240, 241, and 242 to operate an alarm issuing device to prevent an accident.

The image of the 4K surveillance camera 211 is also transmitted to the image analysis device 260, and the image that the station attendant judges to be dangerous is learned. It was possible to automatically issue alarms such as the start and stop of 209 and the emergency stop of the following railroad car 212, so that the operation could be carried out smoothly. It should be noted that the image analysis device 260 was able to enhance the effects of machine learning or deep learning with high-quality 4K video compared to low-quality video.

In this embodiment, the railway company uses its own optical fiber or its wavelength that is laid in the railway facilities such as railroad tracks and side ditches, so the distance is short compared to the case of detouring with the optical fiber of the communication carrier. Because it uses its own optical fiber, it was possible to operate at a lower cost than when borrowing the optical fiber of a telecommunications carrier.

In this embodiment, the optical fibers 270, 271, 272, 273, 274, and 275 for video transmission are single-mode optical fibers, and the optical wavelength for transmission is 1550 nm band. Other wavelength bands, such as bands, and other line types, such as multimode optical fibers, could be used. Also, when it becomes necessary to transmit ultra-high-definition 8K video, the amount of data to be transmitted increases, so it was possible to divide the wavelength or core line into multiple transmissions. Furthermore, when the connection section of the single-mode optical fibers 272, 273, and 275 is long, it is possible to install an optical amplifier in the middle to compensate for the attenuation of the optical signal and transmit it.

Although the optical distributor 221 was used in the above description, the optical signal is converted into an electrical video signal by the 4K uncompressed optical receiver 230 without providing it, and then the video electrical signal is appropriately duplicated to produce a 4K monitoring monitor. Also, it may be applied to an image analysis device.

In a second embodiment of the present invention, an example of monitoring multiple points of railway facilities from one point will be described.

In FIG. 4, 300 is a railway line, 301 is a railway vehicle, 302 is the direction of travel of the railway vehicle, 303 and 304 are railroad crossings that intersect with the railroad line 300, 305 is a railroad station between railroad crossings 303 and 304, and 306 is a station of station 305. office.

310 and 311 monitor railroad crossings 303 and 304. The color depth is 4:2:0/8 bits, the frame rate is 60 frames/second, the data transmission rate is several gigabits/second to 10 gigabits/second, and the near-infrared light is used. Digital 4K surveillance camera with high sensitivity, 312 monitors the platform of station 305. Color depth is 4:2:0/8 bits, frame rate is 60 frames per second, data transmission rate is from several gigabits per second. 10 Gbit/s digital 4K surveillance cameras 320, 321, and 322 are 4K uncompressed optical transmitters (DPN9042A, Hikari Co., Ltd.) that convert video output signals from 4K surveillance cameras into uncompressed optical signals with a wavelength of 1550 nm. Path Communications), 323 is a 4K uncompressed optical receiver (DPN9044A, manufactured by Hikari Path Communications Co., Ltd.) that converts uncompressed optical video signals into video signals for 4K surveillance monitors, and 330 and 331 are laid within railway line 300. Single-mode optical fibers 332, 333 are single-mode optical fibers laid in the station 305 facility, 340, 341, 342 connect 4K surveillance cameras 310, 311, 312 and optical transmitters 320, 321, 322 HDMI cable, 350 is a digital 4K surveillance monitor with a screen ratio of 16:9 and a diagonal of 55 inches installed in the station office 306, 343 is an HDMI cable that connects the optical receiver 323 and the 4K surveillance monitor 350, 351 is a 3×1 switching optical switch, and 352 is a station attendant who monitors the 4K monitoring monitor 351 .

The optical switch 351 is switched manually or automatically one minute before the railway vehicle 301 approaches 600 m before the railroad crossing 303 specified in the 600 m clause of railroad operation, and the 4K surveillance camera 310 video on the railroad crossing 303 is monitored in 4K. Transmission to the monitor 350 was started. As a result, the station attendant 352 can confirm the existence of obstacles on the railroad crossing 303 from the station office 306 with 4K video with a latency of about 30 milliseconds, and issue an alarm if an obstacle is confirmed. Met.

Next, the optical switch 350 is switched manually or automatically one minute before the railway car 301 approaches 600 m before the platform of the station 305, and the 4K surveillance camera 312 image on the station 305 platform is transferred to the 4K surveillance monitor 350. Started transmission. As a result, the station attendant 352 was able to confirm the flow of passengers on the platform from the station office 306 with 4K video with a latency of about 30 milliseconds, confirming that passengers boarded and alighted safely.

Furthermore, one minute before the railway vehicle 301 departs from the station 305 and approaches 600 m before the railroad crossing 304, the optical switch 351 is switched manually or automatically, and the 4K surveillance camera image on the railroad crossing 304 is transferred to the 4K surveillance monitor 350. started transmission. As a result, the station attendant 352 can confirm the presence or absence of obstacles on the railroad crossing 304 from the station office 306 using 4K video with a latency of about 30 milliseconds, and issue an alarm if an obstacle is confirmed. Met.

As a result, safety monitoring of railway operations before and after the relevant station can be performed by a single station employee, making it possible to rationally allocate station personnel responsible for operational safety. In addition, since the 4K monitoring monitor 350 in the station office 306 has a diagonal of 55 inches, multiple station attendants can share 4K images at the same time, and it was possible to detect situations that would impede operation at an early stage. If the route length is short, it is possible to monitor the entire route at one location, but it was also possible to divide the entire route into multiple areas and perform similar monitoring for each area. Furthermore, by making the lenses, filters, image sensors, etc. of the 4K surveillance cameras at railroad crossings 303 and 304 capable of penetrating and sensitive to near-infrared light, ultra-low-latency and It was possible to monitor railroad crossings 303 and 304 with 4K video.

In addition to the above description, in the second embodiment, a high-definition image is applied to an image analysis device installed in, for example, a station office in the same manner as in the first embodiment, and the image analysis device performs necessary analysis and recording. When the image analysis equipment detects a dangerous event, an alarm signal is issued from the image analysis equipment, and the alarm issuance device is operated to issue an alarm, thereby preventing accidents.

In the third embodiment of the present invention, an example of monitoring bridges and tunnels, which are important structures of expressways, with ultra-low delay and high image quality will be described.

In FIG. 5, 400 is an expressway, 401 is a bridge of the expressway 400, 402 is a tunnel of the expressway 400, and 403 and 404 are road information display boards installed in front of the bridge 401 and tunnel 402, respectively.

The 410 and 411 have a color depth of 4:2:0/8 bits, a frame rate of 60 frames/second, a data transmission rate of several gigabits/second to 10 gigabits/second, and are sensitive to near-infrared light. 4K surveillance cameras 412 and 413 are 4K uncompressed optical transmitters (DPN9042B, manufactured by Optical Path Communications Co., Ltd.) that convert the video output signals of 4K surveillance cameras into uncompressed optical signals with a wavelength of 1550 nm, and 414 and 415 are 4K uncompressed optical receivers (DPN9044A, manufactured by Hikari Path Communications Co., Ltd.), installed in road control centers in parking areas and toll gates, convert uncompressed optical video signals into video signals for 4K surveillance monitors, 416 and 417. HDMI cable connecting 4K surveillance cameras 410, 411 and optical transmitters 412, 413, 420 is a single-mode optical fiber installed in the gutter of highway 400, 421 is a wavelength multiplexer, 422 is a wavelength demultiplexer, 423 424 and 425 are single-mode optical fibers that connect the wavelength demultiplexer 421 and the wavelength demultiplexer 422 installed in the gutter of the highway 400, and 424 and 425 are the single-mode optical fibers that connect the wavelength demultiplexer 422 and the optical transmitters 414 and 415. , 426 is a single-mode optical fiber connecting the optical transmitter 412 and the wavelength multiplexer 421, 427 is an image analysis device equipped with a machine learning or deep learning function, 430 and 431 are a screen ratio of 16:9 and a diagonal of 43 inch, digital 4K surveillance monitors, 432 and 433 are HDMI cables connecting optical transmitters 414 and 415 respectively to 4K surveillance monitors 430 and 431, 434 and 435 are optical receivers 414 and 415 and image analysis equipment 427 respectively. HDMI cable to connect. 440 and 441 are vehicles traveling on the highway 400 in the direction of the bridge/tunnel, and 442 are monitors of the 4K monitoring monitors 430 and 431 .

Vehicles 440 and 441 running on highway 400 at a speed of 120 km/h move about 33 m per second, and need about 60 to 70 m to stop even if they brake suddenly. Therefore, in the event of an earthquake or collapse due to deterioration over time, a fire due to a vehicle failure, or a river flooding or a sign of such, the road information display boards 402 and 404 must immediately display emergency information. be. In the conventional monitoring method using IP network cameras, in the case of D1 image quality, it was possible to transmit and display images on the monitoring monitor of the observer with a delay of about 0.5 seconds. It was difficult. On the other hand, in the case of 4K high image quality, it is easy to grasp the situation at the site, but if the video transmission to the 4K monitoring monitor of the monitor goes through the IP network, a video transmission delay of about 2 to 3 seconds will occur. In addition, the idling distance of vehicles 340 and 341 is nearly 100 m. For this reason, it was difficult to make an emergency stop just before the disaster site.

On the other hand, according to this system, 4K video from 4K surveillance cameras 410 and 411 can be displayed on 4K surveillance monitors 430 and 431 with an ultra-low delay of about 30 milliseconds, and 4K video can be transmitted to image analysis equipment 427. And the free running distance of the vehicle in between was only 1 m. As a result, the image analysis device 427 issues a warning such as "disaster closed" display on the road information display boards 403 and 404 at the disaster site with sufficient time to stop the vehicles 440 and 441 on the expressway 300. By doing so, it was possible to reduce the risk of vehicle accidents. Alternatively, even if the monitor 442 detects a dangerous event from the 4K video of the 4K surveillance cameras 410 or 411, it is possible to issue a warning on the road information display panel 403, 404 at the disaster site and take necessary measures quickly. Met.

In this embodiment, by setting the wavelengths λ ₁ and λ ₂ of the uncompressed optical signals generated from the optical transmitters 412 and 413 to different wavelengths by 10 nm, for example, in the 1550 nm band, wavelength multiplexing transmission is possible with the single-mode optical fiber 423 . Therefore, effective utilization of limited optical fiber resources was possible. Also, in the case where the optical fiber 420 is a single-mode optical fiber laid over a long distance in the side ditch of the highway 500, in addition to the 4K surveillance cameras 410 and 411, the uncompressed optical signals of the 4K surveillance camera images at other points are transmitted. By multiplexing and demultiplexing using a reconfigurable optical add/drop multiplexer (ROADM), it was possible to acquire video from any 4K surveillance camera in the long-distance section of Highway 400. In addition to images, the outputs of vibration sensors installed in bridges and tunnels are superimposed on the above optical fiber network, enabling early transmission of abnormal signals that are signs of collapse. In addition, in-vehicle radios, 5G systems, and other wireless means are used to transmit emergency disaster information to running vehicles, and in conjunction with the vehicle's automatic driving/emergency stop system, the vehicle is automatically pulled over to the shoulder of Expressway 400. It was possible to take preventive safety measures, such as stopping it.

Reference numerals in FIG. 1 are as follows.
1 --- Analog Surveillance Camera
2 --- analog monitoring monitor
3 --- Coaxial cable connecting surveillance camera and surveillance monitor
4 --- Surveillance Monitor Observer
5 --- Digital Surveillance Camera
6---Encoder
7--- Decoder
8 --- Digital Surveillance Monitor
9---IP network
10 --- Cable connecting surveillance camera and encoder
11 --- Cable connecting encoder and IP network
12 --- Cable connecting IP network and decoder
13 --- Cable to connect decoder and monitoring monitor
14 --- Observer of surveillance monitor

Reference numerals in FIG. 2 are as follows.
100 --- Digital 4K Surveillance Camera
101 --- Optical Transmitter
102 --- Optical distributor
103, 104 --- Optical receiver
105 --- Digital 4K Surveillance Monitor
106 --- Image analysis equipment
110, 111, 112 --- Metal cables such as HDMI cables
120, 121, 122 --- single mode optical fiber
130 --- A station attendant watching a 4K surveillance monitor
131, 132 --- Alarm signal
133 --- Alarm device

Reference numerals in FIG. 3 are as follows.
200 --- Railway Lines
201--- Railway Station
202, 203 --- Adjacent station
204, 205, 206 --- station office
207 --- Station platform
208 --- platform door on platform
209 --- Rail cars entering the platform
210 --- Passengers on the platform
211 --- Digital 4K Surveillance Camera
212 --- Trailing rail car
213 --- Direction of following railcar
220 --- Optical Transmitter
221 --- Optical distributor
230, 231, 232, 233, 234 --- Optical Receiver
240, 241, 242 --- Digital 4K monitor installed in the station office
243 --- Digital 4K surveillance monitor installed on the platform
244 --- HDMI cable to connect 4K surveillance camera and optical transmitter
250, 251, 252, 253 --- HDMI cable to connect optical receiver to 4K surveillance monitor
254 --- HDMI cable for connecting optical receiver and image analysis equipment
260 --- Image analysis equipment
270 --- Single-mode optical fiber connecting optical transmitter and optical splitter
271, 272, 273, 274 --- Single-mode optical fibers connecting optical splitters and optical receivers
275 --- Single-mode optical fiber connecting optical splitter and image analysis equipment
280, 281, 282 --- station attendants watching 4K surveillance monitors

Reference numerals in FIG. 4 are as follows.
300 --- Railway Lines
301 --- Railway vehicles
302 --- Direction of travel of railway vehicles
303, 304 --- Railroad crossing with railroad tracks
305 --- railway station between railroad crossings
306 --- Station Office
310, 311 --- Digital 4K surveillance cameras for monitoring railroad crossings
312 --- Digital 4K surveillance camera to monitor the station platform
320, 321, 322 --- Optical Transmitter
323 --- Optical Receiver
330, 331 --- Single-mode optical fiber laid in railroad tracks
332, 333 --- Single-mode optical fiber installed in the station facility
340, 341, 342 --- HDMI cable to connect 4K surveillance camera and optical transmitter
343 --- HDMI cable connecting optical receiver to 4K surveillance monitor
350 --- 4K surveillance monitor installed in the station office, 351 --- Optical switch
352 --- A station attendant watching a 4K surveillance monitor

Reference numerals in FIG. 5 are as follows.
400 --- Highway
401--- Bridge
402 --- Tunnel
403, 404 --- Road Information Board
410, 411 --- Digital 4K Surveillance Camera
412, 413 --- Optical Transmitter
414, 415 --- Optical Receiver
420 --- Single-mode optical fiber installed in highway gutters
421 --- Wavelength Multiplexer
422 --- Wavelength Demultiplexer
423 --- Single-mode optical fiber connecting wavelength multiplexer and wavelength demultiplexer
424, 425 --- Single-mode optical fiber connecting wavelength demultiplexer and optical transmitter
426 --- Single-mode optical fiber connecting optical transmitter and wavelength multiplexer
427 --- Image analysis equipment, 430, 431 --- Digital 4K surveillance monitor
432, 433 --- HDMI cable to connect optical transmitter and 4K surveillance monitor
434, 435 --- HDMI cable connecting optical receiver 414, 415 and image analysis equipment 427
440, 441 --- Vehicles on highways
442 --- Observer for 4K Surveillance Monitor

Claims (7)

High-definition images with a resolution equal to or higher than that of full HD are captured for objects to be monitored on railways or motorways, and the captured information is analyzed to automatically detect dangerous events related to traffic operations and issue warnings. In a traffic monitoring system that issues warnings to prevent accidents,
a monitoring camera that captures images of a point to be monitored;
an electro-optical converter for converting a first video electrical signal output from the surveillance camera into a first optical signal;
an optical transmission line including an optical fiber that transmits the first optical signal output from the electrical-optical converter and generates a second optical signal after transmission;
one or more photoelectric converters for applying the second optical signal and converting it into a second video electrical signal;
a monitoring monitor that applies the second video electric signal and displays a video;
an image analysis device that applies the second video electrical signal to detect the presence or absence of a dangerous event and generates an alarm signal;
an alarm issuing device that issues an alarm to the monitored point from the alarm signal emitted from the image analysis device;
A traffic operation monitoring system characterized by comprising
2. The traffic operation monitoring system according to claim 1, wherein the first electrical video signal, the first optical signal, the second optical signal, and the second electrical video signal are uncompressed signals.
The image analysis device is equipped with a machine learning or deep learning function, and as the number of image analyzes increases, it learns the signs of a situation that hinders operation, and the accuracy of danger prediction can be improved step by step. Traffic operation monitoring system according to 1 to 2
When at least one of the monitor of the monitoring monitor and the image analysis device determines that there is an emergency, an alarm is issued from a second alarm issuing device installed in the traffic control center in addition to the vicinity of the monitoring target point. The traffic operation monitoring system according to claims 1 to 3, characterized in that
From claim 1, characterized in that an alarm issued from at least one of the supervisor of the monitoring monitor and the image analysis equipment is linked with the vehicle operation system to perform an emergency stop of the vehicle and a necessary response. 4. Traffic operation monitoring system according to
6. The traffic operation monitoring system according to any one of claims 1 to 5, wherein at least part of said optical transmission line passes through a provider optical transmission line laid in a transportation facility by a transportation provider.
In the optical transmission line of the business operator, a wavelength different from the optical wavelength used for commercial purposes other than the traffic operation system, or a core line different from the core wire used for commercial purposes other than the traffic operation system in the multi-core optical fiber cable 7. The traffic operation monitoring system according to claim 1, wherein the system is an optical transmission line.

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