KR20100018361A - Closed circuit television - Google Patents

Abstract

PURPOSE: A monitoring camera is provided to effectively sense a subject regardless of day and night. CONSTITUTION: A filter unit(130) filters a signal from a CCD board. The filter unit comprises a daytime optical filter(131) and a nighttime optical filter(132). A motor control unit(150) powers a motor based on a daytime signal and a nighttime signal. And the motor control unit transfers the daytime optical filter or the nighttime optical filter to a filter fixing unit. A zoom lens control unit(155) generates a zoom lens operation signal based on the daytime and nighttime signals.

Description

Surveillance Cameras {Closed Circuit Television}

The present invention relates to a surveillance camera, and more particularly, to detect the day and night, and to replace the filter to automatically pass visible or infrared light according to the detection result, when the filter is replaced accordingly, the focal length of the zoom lens and The present invention relates to a surveillance camera capable of effectively detecting a subject regardless of day or night by operating an aperture.

The present invention relates to a surveillance camera.

In general, security cameras such as houses, department stores, banks, and exhibition halls are installed with a closed circuit television (CCTV) to prevent, prevent or promptly deal with disasters such as intrusion, theft or fire.

In particular, it is difficult to carry out security surveillance by humans at workplaces, military facilities, and public facilities such as borderline, coastline, and port, and large parking lots. Security facilities are needed.

As a result, at least one camera is installed at each of the above-mentioned workplaces, public facilities, and borders, and the intrusion detection, theft of goods, or crimes against the human body are based on the video images captured by the cameras. Measures to prevent or record video images are used as data to identify the exact situation in case of intruders, theft or crimes.

Security surveillance system using a conventional surveillance camera, a camera for photographing the area of the shooting target, a sensing means for detecting the brightness of the shooting target to be photographed by the camera and output to the control means, and controls the overall driving of the camera and detecting means After determining the day mode or the night mode according to the brightness of the shooting target input from the camera, the control signal for turning off the lighting means is generated and output to the lighting means in the day mode, and the control signal for turning on the lighting means in the night mode. Control means for generating and outputting to the lighting means, lighting means for turning on and off in accordance with the on, off control signal output from the control means, and stores the video signal taken by the camera and the stored video signal at the request of the control means Storage means for outputting.

Conventional surveillance cameras as described above, because the power consumption is large, and the light of the luminaire is weak, it can only be illuminated in the latest distance when it is dark, so that only 20-30m or so can recognize the subject.

In particular, at night, the lighting device (eg, a street lamp, a car, etc.) installed around the camera cannot perform a function of improving the sensitivity of the camera, and thus it is difficult to photograph a long distance, which is insufficient to function as a surveillance camera.

Therefore, the present invention has been made to solve the above-mentioned conventional problems, an object of the present invention is to sense day and night by sensing the illumination, and according to the detection result automatically replaces the filter that passes only visible or infrared bands and Accordingly, when a filter is replaced, the present invention provides an surveillance camera capable of automatically detecting a subject regardless of day or night by automatically manipulating a focal length and an aperture size of a zoom lens.

According to a feature of the present invention for achieving the above object, the present invention includes a day and night determination unit for sensing the change in day and night by sensing the illumination and generates a day and night signal according to the detection result; A zoom lens that operates a zoom function automatically based on a zoom lens operation signal; A CCD board that accumulates light input from an external light source and outputs the external light according to the vertical synchronization signal and the horizontal synchronization signal together with the image information collected by the zoom lens; A filter unit configured to filter a signal output from the CCD board, comprising a daytime optical filter for passing visible light and a nighttime optical filter for passing only an infrared band; A motor controller configured to process the daytime optical filter or the nighttime optical filter to be transferred to a filter fixing unit by operating a motor based on the day / night signal; And a zoom lens controller configured to generate the zoom lens manipulation signal based on the day and night signals.

The surveillance camera includes: an imaging unit for converting image information through the filter into an electrical signal; And a video signal processing unit converting image information output as an electrical signal through the imaging unit by an external power source and converting the image information into an image signal.

On the other hand, the zoom lens controller, when the operation mode of the surveillance camera is converted from daytime to night, the zoom lens is processed to automatically adjust to the focal length for the infrared light, and the operation mode of the surveillance camera to convert from night to daytime In this case, the zoom lens is automatically adjusted to a focal length with respect to visible light.

The zoom lens controller may maximize the sensitivity by increasing the aperture of the zoom lens when the operation mode of the monitoring camera is changed from day to night.

The surveillance camera further includes a broadband power supply for outputting power supplied to the surveillance camera at a constant voltage to prolong the life of the camera.

In addition, the surveillance camera further comprises a direction adjusting means which is installed on one side of the coupling plate on which the camera is installed to direct the camera in a desired direction.

The surveillance camera is equipped with a near- or medium-range wide-angle infrared transmitter at the bottom of the coupling plate on which the surveillance camera is installed, and a long-range narrow-angle laser infrared transmitter is mounted at the upper end of the coupling plate. It is advisable to work together to significantly improve the night surveillance distance.

The surveillance camera includes a high temperature detection sensor and a low temperature detection sensor, and when the temperature is higher than the preset temperature, the blower operates to lower the temperature of the monitoring camera. When the temperature is lower than the preset temperature, the temperature of the surveillance camera is increased by using a heating device. desirable.

According to the present invention as described above, the present invention senses day and night by sensing the illuminance, and according to the detection result automatically replaces the filter that passes only visible or infrared bands, and accordingly when the filter is replaced, zoom lens By automatically operating the focal length and the size of the aperture, it is possible to provide a surveillance camera that can effectively detect the subject regardless of day or night.

In particular, the present invention significantly improves the night sensitivity of the camera by blocking visible light (eg, street lamps, vehicles, etc.) around the surveillance camera installation at night by using an infrared band-specific filter, and has a long wavelength infrared rays during the day Diffraction of moisture can be used to improve fog transmittance by 40% or more.

Hereinafter, a preferred embodiment of the surveillance camera according to the present invention as described above will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing the internal configuration of a surveillance camera according to a preferred embodiment of the present invention.

As shown in FIG. 1, the present invention includes a zoom lens 110, a CCD 120, a filter unit 130, a daytime filter 131, a filter fixing unit 132, a night filter 133, and a motor ( 140, a motor controller 150, a zoom lens controller 155, a day / night judgment unit 160, an imaging unit 170, and a video processing signal unit 180.

The zoom lens 110 inputs external image information, and based on the zoom lens operation signal of the zoom lens operation unit 155 to be described later, the zoom function is operated to automatically operate the focal length and to automatically operate the size of the aperture.

The CCD board 120 accumulates the light input from the external light source and outputs the light to the outside in accordance with the vertical synchronization signal and the horizontal synchronization signal together with the image information collected by the zoom lens.

The filter unit 130 includes a daytime optical filter 131 for passing visible light and a nighttime optical filter 133 for passing only an infrared band, and filters the signal output from the CCD board 120. At this time, the surveillance camera 100, if any one of the daytime optical filter 131 or the nighttime optical filter 133 is located in the filter fixing unit 132 by the motor 140 to filter by using the filter. Will be performed.

Meanwhile, the motor controller 150 operates the motor 140 to process the daytime optical filter 131 or the nighttime optical filter 133 to be transferred to the filter fixing part 132 based on the day / night signal. .

The zoom lens controller 155 generates the zoom lens manipulation signal based on the day and night signals. In detail, the zoom lens controller 155 processes the zoom lens 110 to be automatically adjusted to a focal length for infrared light when the operation mode of the surveillance camera 100 is converted from daytime to nighttime. When the operation mode of the surveillance camera 100 is changed from night to day, the zoom lens 110 processes to adjust automatically to the focal length for visible light.

In addition, the zoom lens controller 155 may maximize the sensitivity by increasing the aperture of the zoom lens 110 when the operation mode of the surveillance camera 100 is changed from day to night.

In this case, the visible light used in the surveillance camera 100 in the daytime has a wavelength of 380 nm to 780 nm, and the infrared ray used in the surveillance camera 100 at night has a wavelength of 830 nm to 880 nm. Therefore, the distance between the focus due to the difference between the wavelength of the visible light and the infrared light is different, thereby causing a shift in focus. However, the present invention automatically adjusts the focal length of the zoom lens 110 and the size of the aperture so that it is at night. In addition, there is an advantage that can effectively photograph the subject.

As described above, in the present invention, when the operation mode of the surveillance camera 100 is converted from daytime to night, only the infrared band light passes, thereby blocking visible light (eg, a streetlight vehicle, etc.) installed around the surveillance camera 100. It can be made, and the sensitivity control circuit driving the surveillance camera 100 inherent sensitivity can be greatly improved, and because it blocks visible light, it is possible to prevent the whitening phenomenon, which is inherent in the surveillance camera 100, long-wave length infrared By using the best water phenomena, there is an advantage that can provide more than 40% improved image in the fog area.

Day and night judging unit 160 senses the change in day and night by sensing the illumination and generates a day and night signal according to the detection result, and transmits it to the motor control unit 150 and the zoom lens control unit 155.

At this time, the day and night judgment unit 160 determines that it is daytime when the illumination intensity sensing result is about 4LuX or more, and determines that it is nighttime when the illumination intensity sensing result is about 4LuX or less.

On the other hand, the surveillance camera 100 is equipped with a light sensor (CdS sensor, not shown) to detect the illumination of the light, it is preferable to determine the day and night. The optical sensor has a main component of cadmium sulfide (CdS), it is preferable to form a CdS photoconductive cell having a characteristic that the internal resistance changes according to the incident light energy.

The CdS photoconductive cell has a lower resistance value as the energy of incident light increases. That is, when there is no light energy, it is almost close to the insulator, and when the incident energy is received, the internal resistance becomes small in response to the incident energy, so that current can flow. This feature has the effect of turning on a street lamp or an apartment stair lamp at night and off during the day, and thus the optical sensor of the present invention also applies the principle of this effect.

The imaging unit 170 converts the image information through the filter unit 130 into an electric signal.

The video processing signal unit 180 converts the image information output as an electric signal through the imaging unit 170 by an external power source into an image signal and outputs the converted image signal.

2 is a perspective view of a surveillance camera according to a preferred embodiment of the present invention.

2, the surveillance camera 100 is coupled to the coupling plate 200 for fixing the surveillance camera 100, one side of the coupling plate 200, the direction control means for adjusting the direction of the surveillance camera 100 300, a cover 400 covering the surveillance camera 100, a short-range or medium-range wide-angle infrared light emitter 800, and a long-range narrow-angle laser infrared light emitter 900 are further included.

In addition, the direction control means 300 is formed on the lower side of the coupling plate 200, by adjusting the direction that the coupling plate 200 is directed to adjust the monitoring camera 100 to the desired direction. Direction control means 300 receives a direction signal from the user through a remote control (not shown).

At this time, a long-range or wide-range infrared emitter 800 and a long-range narrow-angle laser infrared emitter 900 are mounted on the upper end of the coupling plate 200 and the coupling plate 200 at a long distance (10m −). 10km) surveillance is possible.

3 is an exploded perspective view of a surveillance camera according to a preferred embodiment of the present invention.

Referring to FIG. 3, the surveillance camera 100 includes a blower 500 for lowering the temperature of the camera 100, a broadband power supply 700 for outputting power supplied to the camera 100 at 12V, and the camera ( 100), the blower 500, the heater 1000, and the case 600 is accommodated for the zoom lens 110.

The surveillance camera 100 is equipped with a high temperature detection sensor and a low temperature detection sensor (not shown), so that the blower 500 operates at a high temperature of + 35 ° C. or lower, thereby lowering the temperature of the surveillance camera 100, and having a temperature of + 15 ° C. or lower. At low temperatures, it is preferable to increase the temperature of the surveillance camera 100 by using the heater 1000 so that the surveillance camera can operate from -30 ° C to + 55 ° C.

Surveillance camera 100 of the present invention has a built-in broadband power supply (SMPS: Switching mode Power Supply, 700) to supply a stable power supply voltage when DC (DC) + 18V ~ + 36V input DC 12V constant to drive the surveillance camera 100 safely, and can be used for more than five years. In addition, even in the case of AC (AC), when the AC 90V ~ 240V is input to the output voltage is constantly converted to 32V DC to drive the surveillance camera 100 safely.

The rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and a person skilled in the art can make various modifications and adaptations within the scope of the claims. It is self-evident.

1 is a block diagram showing the internal configuration of a surveillance camera according to a preferred embodiment of the present invention.

2 is a front view of a surveillance camera according to a preferred embodiment of the present invention.

3 is an exploded cross-sectional view of a surveillance camera according to a preferred embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100: surveillance camera 110: zoom lens unit

120: CCD 130: filter unit

131: weekly filter 132: filter fixing

133: night filter 140: motor

150: motor control unit 155: zoom lens control unit 160: day and night judgment unit 170: imaging unit

180: video processing signal unit 200: coupling plate

300: direction control unit 400: surveillance camera cover

500: blower 600: storage

700: power supply 800: wide-angle infrared floodlight

900: narrow angle laser infrared floodlight

1000: heating unit

Claims (8)

Day and night determination unit for sensing the change in day and night by sensing the illumination and generates a day and night signal according to the detection result; A zoom lens that operates a zoom function automatically based on a zoom lens operation signal; A CCD board that accumulates light input from an external light source and outputs the external light according to the vertical synchronization signal and the horizontal synchronization signal together with the image information collected by the zoom lens; A filter unit configured to filter a signal output from the CCD board, comprising a daytime optical filter passing visible light and a nighttime optical filter passing only an infrared band; A motor controller configured to process the daytime optical filter or the nighttime optical filter to be transferred to a filter fixing unit by operating a motor based on the day / night signal; And And a zoom lens controller configured to generate the zoom lens manipulation signal based on the day and night signals. The method of claim 1, wherein the surveillance camera, An imaging unit for converting image information through the filter into an electrical signal; And And a video signal processing unit for converting image information output as an electrical signal through the imaging unit by an external power source and converting the image information into an image signal. The method of claim 1, wherein the zoom lens control unit, When the operation mode of the surveillance camera is converted from daytime to night, an infrared band filter is used, and the zoom lens is automatically adjusted to the focal length for the infrared light, and the operation mode of the surveillance camera is changed from night to daytime. And the zoom lens is automatically adjusted to a focal length with respect to visible light. The method of claim 1, wherein the zoom lens control unit, And when the operation mode of the surveillance camera is changed from daytime to nighttime, the aperture of the zoom lens is enlarged to maximize the sensitivity. The method of claim 1, wherein the surveillance camera, And a broadband power supply for outputting power supplied to the surveillance camera at a constant voltage to prolong the life of the camera. The method of claim 1, wherein the surveillance camera, Surveillance camera, characterized in that it further comprises a direction adjusting means which is installed on one side of the coupling plate on which the camera is installed to direct the camera in the desired direction. The method of claim 1, wherein the surveillance camera, Short-range or medium-range wide-angle infrared emitters are mounted on the bottom of the coupling plate on which the surveillance camera is installed, and long-range narrow-angle laser infrared emitters are mounted on the top of the coupling plate to drive together with the night-time infrared floodlight filter for night surveillance distance. Surveillance camera, characterized in that to significantly improve. The method of claim 1, wherein the surveillance camera, Built-in high-temperature detection sensor and low-temperature detection sensor, the blower operates to lower the temperature of the surveillance camera when the temperature is higher than the preset temperature, and increases the temperature of the surveillance camera by using the heating device when the temperature is lower than the preset temperature. la.

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