KR101067382B1 - Light control apparatus of the camera for cctv - Google Patents

Abstract

The present invention relates to a light control device of a Citizen-use camera easy to identify the vehicle number,
While converting AC 220V power from the outside into 12V through a transformer and converting AC 12V power from the above transformer into a working power source which is DC 12V power through a rectifier, supplying this operating power to the inside including CCTV camera, A frequency detector for detecting a frequency of 60 Hz from an AC 12V power supply of the rectifier;
A synchronization signal for controlling the operation of a CCTV camera as a synchronization signal for capturing one field constituting one screen by 60 Hz by receiving a frequency of 60 Hz detected by the frequency detector and setting it as a synchronization signal for an internal operation cycle. With setting part,
A CCTV camera for capturing screens of one field by the synchronization signal transmitted from the synchronization signal setting unit and outputting NTSC video signals to the monitor;
It consists of a switching device that turns on the light emitting diodes while the NTSC video signal transmitted from the CCTV cameras to the monitor is simultaneously received while the video is taken. It is configured to allow shooting without being affected by the brightness of the camera.

Description

LIGHT CONTROL APPARATUS OF THE CAMERA FOR CCTV}

The present invention relates to a lighting control device for a Citizen (hereinafter referred to as CCTV) camera that can easily identify the vehicle number, and in detail, detects 60Hz of the input AC power and uses it as a synchronization signal. By controlling the light-emitting diode on and off while driving the switching element directly with the NTSC video signal captured by the signal, the light-emitting diode is turned on only when the CCTV camera is photographed so that the image is not affected by the brightness of the surroundings. The present invention relates to a lighting control device of a Citizen-use camera that is easy to identify a vehicle number.

In general, CCTV (Closed Circuit Televsion) refers to a video system for delivering the image information to a predetermined receiver for a specific purpose, and generally uses a video transmission method by wire.

CCTV cameras are widely used for security, crime prevention and parking control systems, road traffic monitoring, forest fire monitoring, river level monitoring, three-dimensional measurement and measuring instruments, and medical endoscopes.

However, CCTV cameras are affected by the image quality depending on the brightness of the surroundings, and are affected more at night than at daytime, and more before and after sunrise and sunset.

Therefore, the lighting used in CCTV cameras is also very important and has become an essential item of CCTV cameras.

CCTV camera lighting is an essential item for night shots or dark places in closed spaces, and is being replaced by LED lighting with the development of technology. This is increasing rapidly.

However, despite the fact that the lighting of CCTV cameras is being replaced by new LED lights, many studies are being carried out to make it possible to shoot in low light as a part of improving the object because the objects are not clearly seen when shooting dark spaces.

CCTV cameras are photographed in color during the day, and mainly in mono (MONO) images at night or in closed dark spaces (in the dark spaces), mainly using infrared LEDs (IR LEDs) as lighting.

LED light can be classified into visible light and non-visible light (infrared or ultraviolet). Visible light LED light is mainly used in inhabited environment such as indoor light, street light, automobile headlight, and traffic light. It is used as night light for measuring, measuring and measuring equipment and CCTV camera.

CCTV cameras used at night are mainly used for security and crime prevention, and infrared cameras are used for lighting. CCTV cameras for other closed spaces are used as general high-brightness LEDs.

CCTV camera lights used for security and security use have a wavelength other than visible light that does not affect the surrounding environment, that is, IR (infrared ray) LEDs are widely used as lighting.

In order to turn on the LED lighting, there is a method of continuously turning on the current and controlling the current pulse width (Pulse With Modulation (PWM)). PWM method is mainly used because of its efficiency, but it provides high quality light source as CCTV camera lighting. It is still unsuitable for the following.

The PWM method for controlling LED lighting is to reduce the pulse width to increase the brightness (brightness) of the LED light, increase the pulse width to increase the intensity of the current, or decrease the brightness regardless of the characteristics of the CCTV camera. This method reduces the intensity of the LED light, so it is possible to improve the brightness of the LED light with less power consumption than controlling the current by continuously flowing the LED light. There is a shortage and flicker occurs under control by the pulse.

Although CCTV cameras for road security and security control LED lighting by PWM method, when the brightness is weaker than the headlights due to the influence of vehicle headlights, CCTV camera imaging devices are exposed to the light too much by the headlights. If the light temporarily turns white or the headlights are turned off at night, the vehicle is not visible.

In addition, LED lighting for CCTV cameras on the road has disadvantages such as high power consumption and high manufacturing cost since hundreds of LEDs are collected and used on a printed board.

Thus, Patent Application No. 10-2009-0034659 dated April 21, 2009 (LED lighting control method of a closed circuit television camera) has been proposed,

This, in controlling the LED light for CCTV camera, the first step of separating the video synchronization signal from the video signal input from the CCTV camera;

A second step of calculating an exposure time and an exposure time of the image pickup device from the video synchronization signal separated through the first step;

Closed circuit by configuring the LED lighting as a third step of supplying power to the LED module and cutting off the LED module as much as the exposure time from the CCTV camera image pickup device exposure time using the CCTV camera image pickup device exposure time and exposure time obtained through the second step. Light Emitting Diode (LED) lighting used in closed circuit TV (CCTV) cameras can be used to maximize LED lighting efficiency and extend the lifespan by several times while saving consumption.

However, according to the LED lighting control method of the conventional closed-circuit television camera as described above, the synchronization signal is separated from the video signal input from the CCTV camera, and the exposure time and the exposure time of the photographing device are calculated therefrom. In order to control the time for supplying power to the LED module, the power is supplied to the LED module at the correct time. The lighting control device and method again perform a synchronization signal when the reset is performed after the power supply is cut off and resumed. There is a disadvantage in that it is necessary to repeat the process of extracting and calculating and storing the exposure time and exposure time through this. Also, since a complex program must be embedded in each closed-circuit television camera, there is a problem that the structure becomes complicated. After execution, it is necessary to extract synchronization signal. At first, the first screen had a disadvantage of not being able to perform LED lighting.

Accordingly, the present invention is to solve the conventional problems as described above, to detect the 60Hz of the AC power input to use as a synchronization signal, and drive the switching device directly with the NTSC video signal captured by the 60Hz synchronization signal Lighting control device for CSI-enabled cameras for easy identification of vehicle number, which enables light emitting diodes to be turned on only when shooting CCTV cameras so that the LEDs can be photographed without being affected by the surrounding brightness. To provide that purpose.

Lighting control device of the Citizen camera easy to identify the vehicle number of the present invention for achieving the above object,

Transformer converting AC 220V power supply from the outside into 12V,

A rectifier for converting the AC 12V power from the transformer into a DC 12V operating power supply and supplying the operating power to the interior, including a CCTV camera,

A frequency detector for detecting a frequency of 60 Hz from an AC 12V power supply of the rectifier;

A synchronization signal for controlling the operation of a CCTV camera as a synchronization signal for capturing one field constituting one screen by 60 Hz by receiving a frequency of 60 Hz detected by the frequency detector and setting it as a synchronization signal for an internal operation cycle. With setting part,

CCTV camera to shoot the screen of each field by the synchronization signal transmitted from the synchronization signal setting unit;

A monitor for expressing an image by receiving an NTSC video signal photographed by the synchronization signal from the CCTV camera;

It is characterized in that it consists of a switching device that receives the NTSC video signal transmitted from the CCTV camera to the monitor at the same time and turns on the light emitting diode while being turned on only during the period in which the video is taken.

According to the lighting control device of the Citizen-use camera which can easily identify the vehicle number of the present invention as described above, the AC 220V power source from the outside is converted to AC 12V through a transformer, and the AC 12V power source is DC 12V through a rectifier. A frequency detector which detects a frequency of 60 Hz from the AC 12V power supply of the rectifier while converting it into an operating power supply and supplying the operating power to a CCTV camera and the like;

A synchronization signal for controlling the operation of a CCTV camera as a synchronization signal for capturing one field constituting one screen by 60 Hz by receiving a frequency of 60 Hz detected by the frequency detector and setting it as a synchronization signal for an internal operation cycle. With setting part,

A CCTV camera for capturing screens of one field by the synchronization signal transmitted from the synchronization signal setting unit and outputting NTSC video signals to the monitor;

At the time of shooting CCTV cameras, it is composed of switching elements such as transistors and field effect transistors that light up the light emitting diodes while the NTSC video signals are simultaneously transmitted from the CCTV cameras to the monitor and are turned on only during the period when the images are taken. Only the light emitting diode is turned on so that the photography can be taken without being affected by the brightness of the surroundings.

1 is a block diagram showing the overall configuration of the present invention.

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

1 is a view showing a schematic configuration of a lighting control device of a Citizen-use camera easy to identify the vehicle number according to the present invention,

Transformer (1) which converts AC 220V power supplied from the outside into 12V,

A rectifier 2 for converting the AC 12V power supply from the transformer 1 into an operating power source of DC 12V, and supplying this operating power to the interior including the CCTV camera 5;

A frequency detector (3) for detecting a frequency of 60 Hz from the AC 12V power supply of the rectifier (2);

By receiving the frequency of 60Hz detected by the frequency detector 3 and setting it as a synchronization signal for the internal operation cycle of the CCTV camera 5 as a synchronization signal for photographing one field constituting one screen by 60Hz A synchronization signal setting section 4 for controlling the operation,

CCTV cameras (5) for taking pictures of one field by screen by the synchronization signal transmitted from the synchronization signal setting unit (4),

A monitor 6 expressing an image by receiving an NTSC video signal photographed by the synchronization signal from the CCTV camera 5;

Transistors, such as transistors and field effect transistors, which light up the light emitting diodes 8 while being turned on only during a period in which the image is simultaneously received when the NTSC image signals transmitted from the CCTV camera 5 to the monitor 6 are simultaneously received. It consists of (7).

The lighting control device of the Citizen camera easy to identify the vehicle number of the present invention configured as described above,

AC 220V power supplied from the outside is converted to AC 12V while voltage drop in the transformer (1).

The AC 12V power supply from the transformer 1 is rectified by a full wave via a rectifier 2 such as a bridge diode, converted into a DC 12V power supply, and supplied as an operating power source to the inside including the CCTV camera 5.

The frequency detector 3 detects a frequency of 60 Hz from the AC 12V power supply of the rectifier 2 that supplies the power for internal operation including the CCTV camera 5.

The synchronization signal setting unit 4 which receives the frequency of 60 Hz detected by the frequency detector 3 is set as a synchronization signal for an internal operation cycle, thereby synchronizing the photographing of one field constituting one screen at 60 Hz. Controlling the operation by transmitting to the CCTV camera 5 as a signal.

In response to the synchronization signal transmitted from the synchronization signal setting unit 4, the CCTV camera 5 captures screens of one field.

The monitor 6 receiving the NTSC video signal photographed by the synchronization signal from the CCTV camera 5 allows the image to be represented as an image.

In the switching device 7 which simultaneously receives the NTSC video signal transmitted from the CCTV camera 5 to the monitor 6, the NTSC video signal is normally transmitted through a transistor or a field effect transistor, that is, the CCTV camera 5 ) Is output as " H " only while shooting is in progress, and the light emitting diode 8 is turned on while being turned on only for a corresponding period, so that a clear image can be always obtained regardless of ambient brightness.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but many variations and modifications may be made without departing from the scope of the invention. It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

1: transformer 2: rectifier
3: Frequency detection unit 4: Synchronization signal setting unit
5: CCTV Camera 6: Monitor
7 switching element 8 light emitting diode

Claims (2)

Transformer (1) which converts AC 220V power supplied from the outside into 12V,
A rectifier (2) for converting the AC 12V power supply from the transformer (1) into a DC 12V operating power supply and supplying this operating power to the interior including the CCTV camera (5);
A frequency detector (3) for detecting a frequency of 60 Hz from the AC 12V power supply of the rectifier (2);
The synchronization signal setting unit receives a frequency of 60 Hz detected by the frequency detector 3 and sets it as a synchronization signal for an internal operation cycle and outputs it as a synchronization signal for capturing one field constituting one screen at 60 Hz. (4) and,
Lighting control device for a CSI easy camera identification, characterized in that consisting of a CCTV camera (5) to take a picture of one field by screen according to the synchronization signal transmitted from the synchronization signal setting unit (4). The method according to claim 1,
According to the synchronization signal transmitted from the synchronization signal setting unit 4, the CCTV camera (5) to shoot the screen of each field,
In the CCTV camera (5) to display the image on the monitor 6 receives the NTSC video signal photographed by the synchronization signal,
The switching device 7 which receives the NTSC video signal transmitted from the CCTV camera 5 to the monitor 6 at the same time is only configured to turn on the light emitting diode 8 while being turned on only during a period in which the video is taken. Lighting control device of the Citizen camera easy to identify the vehicle number.

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