KR101346422B1 - High speed camera system of tunnel safety monitoring. using infrared ray - Google Patents

Abstract

The present invention provides a camera system mounted on a vehicle and photographed for maintenance of a road tunnel wall portion and a crown portion, comprising: an infrared illuminating device for lighting an infrared LED light based on a trigger signal of a camera shutter, and a shutter trigger signal A high speed camera system for outputting the infrared illuminating device and capturing an image, and a storage device for storing image information captured by the high speed camera system, wherein the infrared illuminating device is configured to turn on a trigger signal. The lighting is controlled immediately before the lighting is controlled so that the photographing is performed at the brightest point of time, and the image storage device includes a position detecting means, and the position detection information is mapped to the image information so that the position of the image can be confirmed. Has a feature.

Description

High speed camera system of tunnel safety monitoring. using infrared ray}

The present invention relates to a camera system that is attached to the vehicle and photographed when necessary for the maintenance of the road tunnel wall and the crown portion, and more particularly, using high-performance infrared light while ensuring uninterrupted high speed driving in a dark tunnel environment. The present invention relates to an infrared illumination tunnel inspection high speed camera system which collects a high resolution clear tunnel inspection image.

In general, the tunnel inspection method currently used is a method of inspecting on foot and photographing while moving at a low speed by using a specially manufactured vehicle such as a tunnel scanner.

The method of checking on foot requires a lot of walking, so it takes a lot of time, and if the vehicle is blocked, it causes a delay. If the vehicle is not blocked, tunnels other than pole tunnels do not have a separate inspection road. The risk of the inspector is high.

The use of specially constructed vehicles such as tunnel scanners has to slow down the traffic, which hinders road traffic, and the use of visible light is not only a visual burden to drivers passing by, The disadvantage is the high cost and power consumption.

These methods are not able to solve the root causes that can ensure the safety of the inspector, ensure the safe and smooth maintenance of road tunnels without disturbing the communication of the vehicle and without visual burden on the driver. will be.

The present invention has been devised to solve the above problems of the prior art, by applying a charge-discharge infrared illumination system that supports a controller synchronized with the shutter trigger of the high speed camera to travel at a high speed to travel through a tunnel A system that allows a high-speed camera of a vehicle to take a picture inside a dark tunnel, and provides an infrared-illuminated tunnel inspection high speed camera system that performs tunnel inspection only by driving at high speed in a dark tunnel environment where there is not enough light for imaging the camera. There is a purpose.

The present invention, by using the infrared light, to be able to obtain the structure image in the tunnel without affecting the driver of other vehicles around.

In addition, the present invention, GPS is used in the out-tunnel section, and the position information and the distance of the captured image by displaying the position information of the image information by calculating the distance using the acceleration sensor, RFID tag, laser sensor, etc. in the out-tunnel section In order to provide accurate information, it is to provide an infrared illumination tunnel inspection high speed camera system for inspection of a high-speed driving tunnel in a dark tunnel environment.

According to an aspect of the present invention,

An infrared illuminating device for lighting an infrared LED light based on a trigger signal of a camera shutter;

A high speed camera system for automatically generating a shutter trigger signal according to a shutter trigger synchronization input and output setting, outputting the shutter trigger signal to the infrared illuminating device, and capturing an image;

A location and distance information system that collects current location and distance information to display the location of the captured image in the captured image data when the image is captured;

And a storage device for storing image information photographed by the high speed camera system.

The infrared illuminating device,

An infrared LED array illumination board for arranging infrared LEDs to make infrared lights;

Boost charging for receiving a shutter trigger signal from the high-speed camera system to switch the power to turn on the infrared LED array lighting board, but to supply a large amount of current so as to provide sufficient brightness when the shutter trigger is turned on A lighting control switch board comprising a circuit and a switching circuit;

Stabilizing the power input from the power supply device is characterized by consisting of a power supply for converting the DC 12V to supply power to the light control switch board.

The infrared LED array illumination board uses an array of durable and semi-permanent infrared LEDs to ensure the lifetime of the illumination. In order to guarantee the performance in the present invention, four infrared LED boards using 400 arrays per board are used.

The light control switch board supplies current to the infrared LED light board and cuts it off, and the charging circuit and the large current flow switch circuit to flow a large amount of current for sufficient brightness in a short time when the camera shutter trigger is "ON". It includes.

The power supply unit converts the commercial power AC 220V to DC 12V to supply power to the lighting control switch board, and converts AC 220V / DC 12V in case of use in a mobile vehicle where AC 220V commercial power cannot be used. It includes a switch and a DC 12V stabilization circuit.

A high speed camera system that supports a high shutter speed is a high speed shutter triggered camera that can adjust the shutter speed of the camera from 1 to 1/10000 sec., And I / O interface connector to select shutter trigger sync input and output according to settings. Support.

The camera supports IEEE 1394 or Gigabit Ethernet's Law data high-speed image transmission interface to transmit the captured image to the image storage device, and the image storage software stores the image according to the storage format of the image by setting.

The storage device for storing image information is a computer-based operating system device that supports IEEE1394 or Gigabit Ethernet interface, which is a Law data interface with a camera, and stores image data received in the Law data format into a memory disk according to the setting value of the image storage software. Save it.

The video storage device is stored using a memory disk that is safe from impact damage in consideration of the fact that the camera system is mobile, and the memory disk easily removes and supports the movement and transportation of the captured image data.

The location and distance information collecting device receives the location information by GPS, determines the current location of the vehicle, and checks the information of the proximity tunnel in progress from the location information of the GPS. It is determined that the user enters the vehicle, and photographing is started, and moving distance information is received from the vehicle from the photographing time point, and the distance information based on the position is displayed on the image.

In view of the fact that the mobile system supports the detachability in the system configuration, the configuration of the camera system is characterized in that between 1-3 shooting and synchronization between each other.

As described above, the present invention is an infrared light tunnel inspection high speed camera system that guarantees a high speed driving without interruption, and uses a charge / discharge infrared lighting system and a high speed camera system that guarantee high speed mobility and support a shutter trigger, thereby enabling a structure in a tunnel. The camera system is installed in a vehicle that moves at high speed when shooting a camera, and the camera system is recorded and provided with high resolution that can be maintained without visually affecting other driving vehicles in the same situation as driving and passing through a tunnel. It is a very useful invention that can reduce maintenance costs and inspect at any time, and thus provide a safer tunnel environment.

1 is a block diagram of an infrared illumination tunnel inspection high-speed camera system according to the present invention.
Figure 2 is a detailed configuration of the infrared illumination device of the infrared illumination tunnel inspection high speed camera system according to the present invention.
Figure 3 is an exemplary view of the arrangement of the infrared LED array lighting board and the light control switch board of the infrared light tunnel inspection high-speed camera system according to the present invention.
Figure 4 is a block diagram of the image storage device of the infrared illumination tunnel inspection high speed camera system according to the present invention.
5 is an exemplary view of an image storage device according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an infrared illumination tunnel inspection high speed camera system according to the present invention.

An infrared illuminating device (100) which illuminates an infrared LED light based on a trigger signal of a camera shutter;

A high speed camera system 200 for automatically generating a shutter trigger signal according to a shutter trigger synchronization input and output setting and outputting the shutter trigger signal to the infrared illuminating apparatus 100 and capturing an image;

And a storage device 300 that stores image information photographed by the high speed camera system 200.

Figure 2 is a detailed configuration of the infrared illumination device of the infrared illumination tunnel inspection high speed camera system according to the present invention.

The infrared illuminating device 100,

An infrared LED array illumination board 110 for arranging infrared LEDs to make infrared lights;

Receiving a shutter trigger signal from the high-speed camera system 200 to switch the power to turn on the infrared LED array illumination board 110, the power is charged so as to achieve sufficient brightness when the shutter trigger is turned on A lighting control switch board (120) for controlling lighting lighting by discharging the infrared LED array lighting board (110) by a trigger signal;

It is composed of a power supply unit 130 for supplying power to the lighting control switch board 120, the high speed camera system 200 and the image storage device 300 by converting the DC 12V by stabilizing the external input power. It is done.

Figure 3 is an exemplary view of the arrangement of the infrared LED array illumination board and the light control switch board of the infrared illumination tunnel inspection high-speed camera system according to the present invention.

The infrared LED array lighting board 110 is used to arrange a durable and semi-permanent infrared LED to ensure the life of the lighting. In the present invention, in order to ensure the performance of the brightness required by the camera used four infrared LED array lighting board 110 consisting of 399 three-column serial array per board, one per two infrared LED array board (110) The light control switch board 120 was used. That is, two infrared LED array boards 110 are connected to one lighting control switch board 120.

Since the infrared LED array lighting board 110 has a maximum voltage of 2.3V, three LEDs 111 are connected in series, and a series resistor is added to prevent degradation and limit current.

The lighting control switch board 120 serves to supply and cut off current to the infrared LED array lighting board 110, and to charge a large amount of current to provide sufficient brightness in a short time when the camera shutter trigger is “ON”. It includes a switch circuit and a large current flow.

The light control switch board 120, as shown in Figure 2,

A charging circuit 121 for charging the boost capacitor 122 with the power supplied from the power supply device 130, a discharge circuit 123 for discharging the power charged in the boost capacitor 122, and the discharge circuit; Switch unit 124 for connecting the output of the (123) to the infrared LED array illumination board 110, and receives the shutter trigger signal from the high-speed camera system 200 to control the switch unit 124 infrared LED It is characterized in that it comprises a control unit 125 for controlling the charging and discharging of the boost capacitor 122 by controlling the lighting of the array illumination board 110 and the charging circuit 121 and the discharge circuit 123. .

The switch unit 124 of the light control switch board 120 uses a MOS FET to minimize the damage of the contact due to the accumulation of fatigue due to the switching of the current, the maximum current to pass the maximum current consumption of the LED instantaneously Use a switch element above the value.

Switch element maximum current value = 1 A x approximately 133 = 133 A

                (1 Maximum Current Value) x (Number of LED Arrays)

The switch element should use a device that can pass a current of 133 A or more of the instantaneous pulse current, and this is the value of one module, so to control two LED lighting boards from the control board, two elements or two switch elements having a double current capacity Should be used.

The instantaneous pulse current of this current value means f = 1KHz and Pulse width = 50 μs.

Using the trigger signal to control the charging and discharging of the boost capacitor 122, the shorter the "ON" time of the LED light control switch has a problem that the LED may not be bright enough due to the response time delay of the LED. In order to solve this problem, the trigger time is determined at a predetermined interval according to the number of frames set in the video recording of the camera, so that the next switch "ON" time can be predicted when the number of video recording frames is determined.

Using this, the control unit 125 calculates the interval of the trigger signal using the frames per minute of the camera set as image storage, predicts the time when the next trigger signal is "ON" after the previous trigger signal is turned on, and then triggers the next trigger. Predictive control is performed to predict the trigger signal in advance by generating one control pulse, that is, a switch signal for turning on the switch unit 123, immediately before receiving the “ON” signal. Set the switching timing to turn on the infrared LED light at the timing just before the next trigger, and start counting when the trigger signal is input and turn on the infrared LED light at the preset timing. By starting the exposure of the camera, the image sensor of the camera can obtain the image irradiated with the brightest light Take a picture of the image.

The power supply unit 130 serves to supply power to the lighting control switch board 120 by converting commercial power AC 220V into DC 12V, and in case of using in a mobile vehicle in which AC 220V commercial power cannot be used. It includes AC 220V / DC 12V changeover switch and DC 12V stabilization circuit.

The high speed camera system 200 that supports the high speed shutter speed is a high speed shutter triggered camera that can adjust the shutter speed of the camera from 1 to 1/10000 sec. It supports O interface connector.

The camera supports IEEE 1394 or Gigabit Ethernet's Law data high-speed image transmission interface to transmit the captured image to the image storage device, and the image storage software stores the image according to the storage format of the image by setting.

Figure 4 is a block diagram of the image storage device of the infrared illumination tunnel inspection high-speed camera system according to the present invention.

In the high speed camera system according to the present invention, in storing the captured image information, the basic purpose is to find a part for maintenance management by image analysis by mapping and storing position information. Therefore, site location information of the captured image is necessary. Accordingly, in the present invention, the location information is detected and mapped to each image information to be stored.

Image storage device of the present invention, as shown in Figure 4,

An image signal receiver 310 receiving an image captured by the high speed camera system 200;

A GPS receiver 320 for receiving GPS satellite signals and detecting location information;

An RFID tag reader 340 for reading the reference position information from the RFID tag 400 installed at each preset reference position in a tunnel or a road site;

A mileage measurement unit 350 that measures mileage information of the vehicle from the ECM 500 of the vehicle;

Continuously and automatically detecting the current position information by using the position information of the GPS receiver 320, the reference position information of the RFID tag reader 340 and the travel distance measurement information of the travel distance measuring unit 350. A position detector 330;

A mapping storage controller 360 for controlling storage by mapping current position information of the position detector 330 to image signal reception of the image signal receiver 310;

And a memory disk 370 that stores an image under the control of the mapping storage control unit 360.

The GPS receiver, which is a general means of measuring location information, is basically used to measure location information using GPS information in the GPS receiving area, to predict the location of the approaching tunnel based on the measured location information, and to determine the corresponding tunnel. The camera sets the photographing angle and the focal length to be photographed, and maps the position and the distance information to the corresponding image when the image is captured.

In the out-tunnel section, the image is stored using the GPS location information received by the GPS receiver 320, and the GPS tag is not available in the tunnel section. The position correction is performed using the reference numeral 400, the distance information is acquired from the vehicle's ECM 500 through the OBD-II interface, and the position information is detected by calculating the driving distance measured by the driving distance measuring unit 350. do.

The position detector 330 determines whether the GPS signal is properly received by the GPS receiver 320, and detects the position information measured by the GPS receiver 320 as current position information when the GPS receiver is normal, and then stores the mapping storage controller 360. Will output

When the image signal is received by the image signal receiver 310, the mapping storage controller 360 maps the position information detected by the position detector 360 when the image signal is received and stores the position information on the memory disk 370.

The position detector 330 sets the reference position by GPS reception in a predetermined time unit to measure distance and position in an area where GPS reception is not possible, and sets the driving distance measuring unit 350 using the reference position setting point as a trigger signal. Reset and measure the distance traveled from the set reference position (position measured by GPS). Therefore, in a region where GPS reception is not possible, accurate location information may be provided even when GPS reception is not performed by calculating the current location information by adding the driving distance from the most recently set reference location and outputting the current location information to the mapping storage controller 360.

On the other hand, at the entrance of the tunnel, the middle of the tunnel, or the area where GPS reception is difficult, the RFID tag 400 is set in advance to set a reference position, and the corresponding RFID tag is used by the RFID tag reader 340 in the vehicle that is the driving owner. (400). Accordingly, when the RFID tag 400 is detected, the current position information is set as the reference position information, and the driving distance measuring unit 350 is reset to measure the driving distance, and the measured driving distance is added to the set reference position while driving. Detect the current position.

Therefore, according to the present invention, since the image information captured by the high-speed camera system 200 maps and stores the corresponding position information for each frame, the position information of the corresponding image can be known when analyzing the image, which is very effective during maintenance and management. It will be available.

5 is an exemplary view of an image storage device according to the present invention.

The storage device 300 that stores image information is a computer-based operating system device that supports IEEE1394 or Gigabit Ethernet interface, which is a Law data interface with a camera, and stores image data received in the Law data format according to a setting value of image storage software. Save to memory disk.

The image storage device 300 is stored using a memory disk 370 that is safe from impact damage in consideration of the fact that the camera system is mobile, and the memory disk 370 can be easily removed to easily move and transport the captured image data. Support.

The memory disk 370 may be an ESATA storage device 371, a USB mobile storage device 372, an SD storage device 373, a CF storage device 374, or the like.

However, considering the storage capacity or speed of the system, it is most preferable to use the ESATA storage device 371.

On the other hand, in view of the fact that the present invention is a mobile system supporting detachment and detachment in the system configuration, the present invention can be configured as a camera system capable of detachable use of one or more devices depending on the range of the image capturing range. The camera supports each independent shooting, and can be synchronized between a plurality of camera systems by interlocking trigger signals.

As described above, the present invention is designed to be removable for use in a vehicle, so that the system can be attached to the vehicle only when the system is used and stored in a normal state so that it can be used stably for a long time.

In addition, high-speed cameras were used to capture high-resolution images while driving without interruption in order to not interfere with road traffic.

A high speed camera system that guarantees high speed mobility must have a short shutter exposure time in order to prevent image drift. If the shutter exposure time is short, the exposure time of the camera sensor is shortened and the image becomes dark. Therefore, as the shutter exposure time is shortened, bright lighting is required to increase the amount of light.

To get bright lighting, the current consumption is high. This is not suitable for the current trend, such as recommending the government's green system, and difficult to use in removable mobile systems that use the power of the vehicle.

Therefore, in order to obtain a bright light with low power, the shutter synchronous switch type infrared light which uses the minimum image power and the maximum image sensor in synchronization with the exposure time of the shutter is used.

Infrared illumination has the advantage of not being visible to the human eye, which does not burden the driver's view of the front and rear vehicles driving in the same direction as the infrared camera system.

Among the technologies with high similarity, although there is a system of a slow moving photographing system using visible light such as a tunnel scanner, it is different from the method proposed by the present invention.

Many different features, such as guaranteeing high-speed driving without interruptions, detachable to regular vehicles rather than using fixed special vehicles, using infrared lighting, and additional switch circuits to reduce power consumption. As a matter of fact, the system proposed by the present invention is a very useful system that devised a maintenance method using an image rather than a conventional tunnel maintenance method.

It should be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

100: infrared lighting device 110: infrared LED array lighting board
120: light control switch board 121: charging circuit
122: boost capacitor 123: discharge circuit
124: switch unit 125: control unit
130: power supply 200: high speed camera system
300: video storage device 310: video signal receiver
320: GPS receiver 330: location detector
340: RFID tag reader 350: driving distance measuring unit
360: mapping storage control unit 370: memory disk
371: ESATA storage device 372: USB storage device
373: SD storage device 374: CF storage device
400: RFID Tag 500: Vehicle ECM

Claims (8)

An infrared illuminating device (100) mounted in a vehicle and lighting infrared LED light based on a trigger signal of a camera shutter;
A high speed camera system (200) mounted on the vehicle and automatically generating a shutter trigger signal according to a shutter trigger synchronization input and output setting and outputting the shutter trigger signal to the infrared illuminating apparatus (100); And
An image signal receiver 310 receiving an image captured by the high speed camera system 200, an RFID tag reader 340 reading corresponding reference position information from an RFID tag 400 installed at each preset reference position in a tunnel; The driving distance measuring unit 350 measures the driving distance information of the vehicle from the ECM 500 of the vehicle, the reference position information of the RFID tag reader 340, and the driving distance measuring information of the driving distance measuring unit 350. A position detection unit 330 for continuously and automatically detecting the current position information by using and a current position information of the position detection unit 330 mapped to the image signal of the image signal receiver 310 to control storage. And a storage controller 360 and an image storage device 300 mounted on the vehicle and having a memory disk 370 for storing images under the control of the mapping storage controller 360.
When the repair portion of the tunnel is detected while searching for the image stored in the image storage device 300, the position and distance of the repair portion may be determined from the entrance of the tunnel based on the RFID tag 400 which is closest to the repair portion. Infrared illumination tunnel inspection high speed camera system.
According to claim 1, The infrared illuminating device 100,
An infrared LED array illumination board 110 for arranging infrared LEDs to make infrared lights;
A lighting control switch board (120) which charges power to a boost capacitor and discharges the infrared LED array lighting board (110) by a shutter trigger signal from the high speed camera system (200) to control lighting lighting;
Infrared rays, characterized in that consisting of a power supply 130 for stabilizing the power supply to the DC 12V to supply power to the lighting control switch board 120, the high speed camera system 200 and the image storage device 300 Lighting tunnel inspection high speed camera system.
The method of claim 2, wherein the infrared LED array illumination board 110,
A series of infrared LEDs are connected in series to form a line, and a plurality of lines are connected in parallel to configure a single infrared LED array lighting board, and one light control switch board per two infrared LED array lighting boards 110 (120). ) Is configured to connect, but at least two or more infrared LED array illumination board 110 is installed, the infrared illumination tunnel inspection high-speed camera system, characterized in that configured.
The method of claim 2, wherein the light control switch board 120,
A charging circuit 121 for charging the boost capacitor 122 with power supplied from the power supply device 130,
A discharge circuit 123 for discharging power charged in the boost capacitor 122;
A switch unit 124 connecting the output of the discharge circuit 123 to the infrared LED array illumination board 110;
Receiving a shutter trigger signal from the high speed camera system 200 to control the switch unit 124 to control the lighting of the infrared LED array illumination board 110 and the charging circuit 121 and the discharge circuit 123 Infrared illumination tunnel inspection high-speed camera system, characterized in that consisting of a control unit 125 for controlling the charge and discharge of the boost capacitor 122 by controlling the.
According to claim 1, The infrared illuminating device 100,
In order to turn on the infrared LED light just before receiving the "ON" signal of the trigger, which is predicted at a certain interval according to the number of frames of the camera's video recording setting, the time is counted from the time when the trigger signal is received and the infrared LED is set at a preset timing. Infrared illumination tunnel inspection high speed camera system, characterized in that configured to turn on the illumination.
delete delete According to claim 1, Infrared illumination tunnel inspection high speed camera system,
An infrared illumination tunnel inspection high speed camera system, comprising one or more camera systems and configured to synchronize with a plurality of camera systems by interlocking trigger signals of each camera.

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