KR101119658B1 - Cctv camera system - Google Patents

Abstract

PURPOSE: A CC(Closed Circuit) TV camera system is provided to accurately turn on a light at a shutter opening point by using an independent synchronous signal between the CCTV camera and a light control device. CONSTITUTION: A light control device(100) controls on/off of a lighting device to correspond to a shutter opening of a CCTV camera. The light control device includes a synchronous signal extracting unit(121), a processor, and a communication unit(103). The synchronous signal extracting unit extracts a synchronous signal interconnected with the CCTV camera from the CCTV camera. The processor generates a control signal for the lighting device through the extracted synchronous signal. The communication unit communicates with the server.

Description

Closed Circuit Television Camera System

The present invention relates to a closed circuit television (CCTV) camera system, and more particularly, to a CCTV camera system in which lighting is automatically controlled according to a shutter opening time of a CCTV camera.

 As the lighting means provided in the CCTV camera system, LEDs (LEDs) having excellent long life and low power consumption characteristics are used. These LEDs can be broadly classified into a constant current driving method that continuously flows a constant current and a pulse width modulation (PWM) driving method that repeats ON / OFF according to a driving method. In addition, the PWM method is currently used for most CCTV cameras because of the fact that the PWM method can provide brighter light by flowing about 10 times the current than the constant current driving method.

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CCTV cameras require light, that is, illumination, at a specified shutter speed, and this time is called the exposure time to the light of an image pickup device (CCD or C-MOS sensor) for acquiring an image. Therefore, for example, if the shutter speed of the CCTV camera is 1/1000, the exposure time is 1 ms, so the illumination is turned on by this time.
When using the PWM method as a lighting method for CCTV cameras, the camera's shutter opening time must be exactly matched to the lighting on time by turning the light on and off for a very short time. Let's say.

Such a driving method not only provides abundant light quantity to CCTV cameras, but also provides various effects such as saving energy and extending the life of the light by reducing the overall average current consumption.

Conventional technology related to the synchronization of the CCTV camera and the light, there is a registered Patent No. 10-0970249 (name of the invention: LED lighting control method of a closed circuit television camera) and the like.

  The conventional technology is to separate the synchronization signal for driving the LED lighting by the LED lighting control device from the video signal input through the VIDEO OUT terminal of the CCTV camera, and by using the separated synchronization signal so as to expose the image pickup device of the CCTV camera After calculating the exposure time, and relates to a lighting control device to turn on and off the LED light by using the calculated time information.

However, since the conventional technology takes time in the process of separating the synchronization signal and calculating the exposure time and exposure time of the image pickup device of the CCTV camera by receiving the video signal from the VIDEO OUT terminal of the CCTV camera into the LED lighting control device. For example, there is a problem in that the timing of turning on lighting in conjunction with a CCTV camera does not exactly match.
In addition, when the installation place of the CCTV camera and the installation place of the monitor or the recording equipment are separated from each other, the connection cable such as the coaxial cable is long, resulting in attenuation of the video signal or inflow of external noise. A large number of equipments (video signal amplification and splitters, monitors, recording equipment, etc.) connected to the system may cause various effects on the separation of the synchronous signal. In addition, due to such a problem, the exposure time of the CCTV camera image pickup device and the time of turning on the LED light are not exactly matched. As a result, there is a problem that the reliability of the lighting control device is reduced.

In addition, the CCTV camera may be configured such that the shutter speed is automatically set according to the ambient brightness or the like, or the specific shutter speed may be set by an administrator. In the case of the prior art, only a synchronization signal separated from the CCTV camera is used to control the shutter of the CCTV camera. It is not possible to grasp the change of speed, and inevitably has to fix the shutter speed of the CCTV camera to a specific value.

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Furthermore, in the prior art as described above, since the synchronization signal of the light is extracted from the video signal input through the VIDEO OUT terminal of the CCTV camera, the installation such as the CCTV camera and the lighting control device should be installed in close proximity within a predetermined range. There is also the problem of distance constraints. In order to solve this problem, even if a high-resolution high-magnification lens that can be used for long distance shooting is attached to the CCTV camera, the projection distance of the LED light (typically hundreds of meters) compared to the CCTV camera's shooting distance (typically hundreds of meters) Dozens of meters) are relatively short and do not help much.

In addition, in the prior art, since the synchronization signal of the lighting control device is extracted from the video signal of the CCTV camera, there is also a problem that a configuration of a system in which a plurality of CCTV cameras share lighting is impossible in principle.

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KR 10-0970249 B1

[Reference 1] SONY The Basics of Camera Technology [on-line], March 28, 2005 (search date: March 2, 2010)

The present invention has been made to solve the above problems, and relates to a CCTV camera system that the lighting is automatically controlled in accordance with the shutter opening time of the CCTV camera.
In particular, the present invention by using an independent synchronization signal between the CCTV camera and the light control device, to improve the accuracy of the interlocking timing between the CCTV camera and the light, as well as to improve the CCTV camera system made various other performance characteristics It is about.

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CCTV camera system of the present invention for achieving the above object, the lighting device; CCTV camera using the frequency of the AC input power as a synchronization signal; A lighting control device for controlling ON / OFF of the lighting device so as to correspond to a shutter opening of the CCTV camera; And a server for operating and controlling the CCTV camera and the lighting control device, wherein the lighting control device comprises: a synchronization signal extracting unit for extracting a synchronization signal interlocked with the CCTV camera from the AC input power source; A processor for generating a control signal for the lighting apparatus by using the synchronization signal extracted from the synchronization signal extractor; And a communication unit for communication with the server.

Here, the CCTV camera system according to an embodiment of the present invention may further include a day and night determination device for determining the day / night of the surrounding environment, in this case, the lighting control device, the ambient environment is determined by the day and night determination device It may be configured to generate a control signal for activating the lighting device only when determined at night.

In addition, the server receives and stores basic information data including shutter speed information, illumination duration information, and day and night discrimination reference illuminance information, and controls each component to correspond to the basic information data. Can be.

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Since the present invention enables the control of the CCTV camera and the lighting device through an interrupt method by using an external input power as a synchronization signal, the lighting turn-on time exactly matches the shutter open point of the CCTV camera. Synchronization).

In addition, the present invention does not require any means of connection (communication) between them directly and directly from an external input power source, respectively, since the CCTV camera and the lighting control device generate a synchronization signal, and thus the communication effective distance or delay of the signal transmission process ( In consideration of delay, there is an advantage that it is not necessary to limit the separation distance between the CCTV camera and the light control device.

In addition, since the present invention uses an external input power supply as a synchronization signal, an additional advantage such that a system can be configured such that multiple CCTV cameras share a plurality of lights, regardless of the number, if only the same input power is used. have.

1 is an explanatory diagram showing a schematic configuration of a CCTV camera system according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram illustrating a case where AC220V / 60Hz is used as a synchronization signal of a CCTV camera and a lighting control device in FIG. 1.
FIG. 3 is a circuit diagram illustrating a configuration of a power supply unit and a synchronization signal extraction unit included in FIG. 1.
4 and 5 are reference diagrams for explaining a case where a plurality of CCTV cameras share one lighting and a case where one CCTV camera shares a plurality of lighting, respectively.

The objects, features and advantages of the present invention described above will become more apparent through the following examples.

The following specific structural to functional descriptions are merely illustrated for the purpose of describing embodiments in accordance with the concepts of the present invention, and embodiments in accordance with the concepts of the present invention may be embodied in various forms and may not be described in the specification or the application. It should not be construed as limited to the embodiments.
Embodiments in accordance with the concepts of the present invention can be variously modified and have a variety of forms specific embodiments will be described in detail in the present specification or application. However, this is not intended to limit the embodiments in accordance with the concept of the present invention to a particular disclosed form, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.
Terms such as first and / or second may be used to describe various components, but the components are not limited to the terms. The terms are only for the purpose of distinguishing one component from other components, for example, without departing from the scope of the rights according to the inventive concept, the first component may be called a second component, and For example, the second component may also be referred to as a first component.
When a component is referred to as being "connected" or "connected" to another component, it may be directly connected or connected to that other component, but it may be understood that other components may be present in the middle. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that no other component exists in the middle. Other expressions for describing relationships between components, such as "between?" And "immediately between?" Or "adjacent to?" And "directly adjacent to?", Should be interpreted as well.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. As used herein, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof that is described, and that one or more other features or numbers, It is to be understood that it does not exclude in advance the possibility of the presence or addition of steps, actions, components, parts or combinations thereof.
Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and are not construed in ideal or excessively formal meanings unless expressly defined herein. Do not.

Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention.

1 is an explanatory diagram showing a schematic configuration of a CCTV camera system according to an embodiment of the present invention.
Referring to Figure 1, CCTV camera system according to an embodiment of the present invention can be seen that comprises a lighting control device 100, CCTV camera 130 and external input power source 140, and the like.

The lighting control device 100 receives a signal applied to the sync signal extractor 121 and the sync signal extractor 121 for extracting a sync signal interlocked with the CCTV camera 130 from an AC input power source 140. Including an illumination ON / OFF control unit 111 for generating a control signal for the lighting device using the power supply unit 122 for A / D conversion and the synchronization signal extracted from the synchronization signal extraction unit 121 It is composed.

In other words, the lighting control device 100 receives an AC signal from the same external input power 140 as the power applied to the CCTV camera 130 and extracts a synchronization signal interworking with the CCTV camera 130 therefrom. Using this, it controls the ON / OFF of the lighting device.
Here, the lighting control device 100 provided in the CCTV camera system according to an embodiment of the present invention may include a day / night determination module including an optical sensor and the A / D converter 101, and the server ( And a communication unit 103 for communicating with a PC or a control terminal). In this case, it will be apparent to those skilled in the art that the lighting control device 100 may be configured to generate a control signal for activating the lighting device only when the surrounding environment is determined at night by the day and night determination module. .

The lighting control device 100 for controlling the lighting by PWM (Pulse Width Modulation) method, the majority is equipped with a microprocessor unit (Micro Processor Unit), as shown in the work, in addition to the operation of turning on / off the lights Do this. Thus, there may be cases where processing time is delayed or hindered by various tasks that the microprocessor unit is currently performing. Therefore, it may be preferable that the lighting control device 100 according to the embodiment of the present invention is configured to process the synchronization signal as an interrupt signal of the microprocessor unit in order to smoothly perform lighting ON / OFF according to the synchronization signal. have.
In this case, there is an advantage that the microprocessor unit can perform the lighting ON / OFF operation according to the synchronization signal with the highest priority without the effect of delay or interruption of the lighting ON / OFF processing operation due to the operation other than the lighting ON / OFF.

Referring to FIG. 1, the lighting control device 100 rectifies AC 24V / 60Hz to DC 12V in the power supply unit 122 and supplies the same to the driving power, and the AC 60V sync signal extraction unit 121 supplies AC 24V / in the power supply unit. It can be seen that it is configured to extract and process a 60-Hz synchronization signal from 60 Hz to be processed and supplied for use by the interrupt signal input unit 113 of the microprocessor unit. Therefore, the microprocessor unit is interrupted at predetermined time intervals 60 times every second due to the 60 Hz synchronization signal input to the interrupt signal input unit 113.
At this time, although not shown in detail, when the illumination value input from the light sensor in the separate interrupt processing unit is to be turned on the environment, that is, when the surrounding environment is determined to be night by the aforementioned day / night determination module, the illumination is ON It will be apparent to those skilled in the art that the call control unit may have a configuration such that the lighting control signal is output to the FET gate 102 so as to turn on / off the lighting according to a predetermined time by calling the / OFF control unit.
In other words, the FET Gate 102 turns on the LED light by flowing a current when the input signal is at a high level (+ 5V), and turns off the LED light by interrupting the current when a low level is at a low level (0V). To perform the function.
That is, the lighting control device 100 determines the daytime mode of the lighting ON / OFF control unit by determining whether it is night or less by the day / night discrimination module according to the illumination value input from the light sensor. You can deactivate (Daytime FLAG: OFF) and activate Night mode (Night FLAG: ON) .On the contrary, if it is over the illumination value distinguishing day / night, it is classified as daytime to activate the daytime mode of the lighting ON / OFF control unit (Daytime FLAG : ON) and night mode is deactivated (night FLAG: OFF).
The interrupt signal input unit 113 generates an interrupt 60 times per second and performs a function of calling the lighting ON / OFF control unit 111 to correspond to the generated interrupt signal. As described above, the called lighting ON / OFF control unit 111 performs a function of determining lighting ON / OFF according to the day / night mode activation state.
The communication unit 103 of the lighting control device 100 may perform a data transmission / reception function with a server (PC or terminal) or a CCTV camera. The basic setting value of the lighting control device 100 input by an administrator, for example, Various data transmission / reception functions such as lighting turn-on time (1 to 1000 ms), reference illumination value of day / night discrimination, camera shutter speed information, and the like can be performed. Naturally, the communication unit 130 may perform an operation state monitoring function or the like during the operation of the lighting control device 100.
Although not shown in FIG. 1, it will be apparent to those skilled in the art that the lighting control apparatus 100 according to the embodiment of the present invention may further include a memory for storing and managing data required for operation. .

The CCTV camera 130 extracts a synchronous signal by using an AC signal applied from the external input power source 140 and opens the shutter of the CCTV camera 130 to correspond to the extracted synchronous signal. That is, by using the synchronization signal extracted from the AC signal applied from the external input power 140, the CCTV camera 130 performs a shooting function by opening the shutter, the lighting control device 100 is a CCTV camera 130 After receiving the AC signal from the same external input power source 140 that is applied to the extracted signal from the synchronization signal interlocked with the CCTV camera 130 from this, and performs the function of controlling the ON / OFF of the light using this By doing so, it is possible to precisely interlock the operation between the lighting and CCTV camera 130.
Here, the server receives and stores basic information data including shutter speed information, illumination duration information, and day and night discrimination reference illumination information, and controls each component to correspond to the basic information data. Can be.

FIG. 2 is an explanatory diagram illustrating a case in which AC 220V / 60Hz is used as a synchronization signal of a CCTV camera and a lighting control device in FIG. 1, and according to a frequency 200 of AC 220V / 24V 60Hz, which is an external input power source. The synchronization signal 201 and 202 required for generating an image by the camera and the time point 203 at which the lighting should be turned on in synchronization with the CCTV camera in the lighting control device are illustrated.

That is, when the pulse of the synchronizing signal changes from the low (LOW, 0V) state to the high (HIGH, + 5V) state, the pulse may change from the high (+ 5V) state to the low (0V) state. The time is called the "falling edge" state, and the CCTV camera opens and closes the shutter by the shutter speed for the reference point "rising edge" or "falling edge". As a result, the image pickup device is exposed to light as the shutter is opened, and charge corresponding to the image is accumulated by the exposed light, and scans this to generate and output an image signal for each frame. Perform.

On the other hand, the light control unit extracts the sync signal from AC 220V / 24V 60㎐, turns the light on and off for a fixed time (eg 1㎳) on the rising edge of the signal, and turns on and off the light for a fixed time on the falling edge. (When using a CCTV camera for interlaced scan) or (201), it can perform the function of turning on and off the lighting for a predetermined time only at the falling edge of the synchronization signal (when using a CCTV camera for progressive scan) (202).

Therefore, the information about the CCTV camera associated with such an operation may be preferably configured to determine in real time through communication with the server through the communication unit.

To supplement, the CCTV camera can use the internal synchronization when using the DC 12V according to the input power, the AC 24V / 60Hz can be used as the external synchronization when using the AC 24V, in the embodiment of the present invention to use the external synchronization It is configured to use AC 24V / 60Hz as input power.

The AC 24V / 60Hz external input power supply is used as a synchronization signal for processing 60 FIELDs (30 EVEN FIELDs / 30 ODD FIELDs) of CCTV cameras in the case of the Interlaced Scan method (201), and in the case of the Progressive Scan method (202). In a CCTV camera, two pulses of AC 24V / 60Hz can be used as one frame sync signal. Accordingly, the lighting control device (100 in FIG. 1) is also configured to use AC 220V / 60Hz as an input power source to match the synchronization signal with the CCTV camera, and 60Hz synchronization signal extraction unit (FIG. 121 of 1 can be confirmed.

3 is a circuit diagram for explaining the configuration of the power supply unit and the synchronization signal extractor shown in FIG. 1, and in FIG. 4 and FIG. 5, a plurality of CCTV cameras share one lighting and one CCTV camera, respectively. Reference is also shown to explain the case of sharing the lighting.

That is, in the CCTV camera system according to an embodiment of the present invention, as described above, since the external input power source (for example, AC 220V / 24V 60 Hz) is used as the synchronization signal, a separate connection between the CCTV camera and the lighting control device ( Precise synchronization is possible even without communication.

This method can be applied to various configurations, such as synchronizing a plurality of CCTV cameras installed in a single area (zone), a plurality of lighting control devices at the same time, or to share a plurality of CCTV cameras installed in the same place.

In other words, a CCTV camera for a method installed in a road or a residential alley is usually installed like a lighting, and only a short distance shooting and monitoring is possible at night due to the limitation of the projection distance (several meters) of the lighting. However, when applying a CCTV camera system according to an embodiment of the present invention, as shown in Figure 5, not only can be free from the projection distance limit of the illumination, but also can shoot as much as the maximum distance that can be taken with a CCTV camera at night have.

In addition, the CCTV camera performs a shooting function as a monochrome image (MONO) image to the normal infrared light due to the dark lighting at night, when the CCTV camera system according to an embodiment of the present invention can be synchronized to the far distance Done. In particular, in consideration of the situation that the street lamp is being replaced with LED lighting in recent years, the present invention may have an additional advantage such that it is possible to shoot in a color (COLOR) image even at night.

That is, referring to Figures 4 and 5, the CCTV camera system according to an embodiment of the present invention, by using the AC 220V / 24V 60Hz, the external power source as a synchronization signal for the precise interlocking of the shutter opening time illumination of the camera For example, if you use only the same power supply, you can see that it is possible to configure the system so that multiple CCTV cameras share multiple lights.

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The present invention as described above is not limited to the above-described embodiment, variously within the equivalent scope of the technical spirit of the present invention and the claims to be described below by those skilled in the art to which the present invention pertains. Of course, modifications and variations can be made.

100: light control device 101: A / D Converter
102: FET Gate 103: communication unit
111: lighting on / off control section 112: day / night discrimination section
113: Interrupt Signal input unit 121: Sync Signal Extraction unit
122: power supply 130: CCTV camera
131: AC Adapter 140: External Input Power

Claims (3)

Lighting devices;
CCTV camera using the frequency of the AC input power as a synchronization signal;
A lighting control device for controlling ON / OFF of the lighting device so as to correspond to a shutter opening of the CCTV camera; And
And a server for operating and controlling the CCTV camera and a light control device.
The lighting control device,
A sync signal extractor for extracting a sync signal interlocked with the CCTV camera from the AC input power source;
A processor for generating a control signal for the lighting apparatus by using the synchronization signal extracted from the synchronization signal extractor; And
Closed circuit television camera system comprising a communication unit for communication with the server.
The method of claim 1,
It further includes a day and night determination device for determining the day / night of the surrounding environment,
And the illumination control device generates a control signal for activating the illumination device only when it is discriminated at night by the day and night determination device.
The method according to claim 1 or 2,
The server receives and manages basic information data including shutter speed information, illumination duration information, and day and night discrimination reference illumination information, and controls each component to correspond to the basic information data. Circuit television camera system.

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