KR200326664Y1 - Dual ir camera for auto-switching - Google Patents

Abstract

Dual IR camera equipped with an automatic switching function according to the present invention is equipped with a daytime color CCD (20) and a nighttime monochrome CCD (30), respectively, in the CdS circuit section 40, depending on the amount of ambient light in the color CCD ( 20) and the monochrome CCD 30, and when the monochrome CCD 30 operates, the color burst signal that generates color noise is removed through the color killer circuit, so that the color CCD is removed during the day and the color noise is removed at night. The black and white CCD is automatically switched to operate, so that it is possible to always capture the optimal clear image.

In addition, by installing two CCDs 20 and 30 for day and night and lenses 21 and 31 in one DSP 60 and case 10, the problem of focus shift due to different wavelengths of visible and infrared bands is eliminated. There is no effect at all.

Description

Dual IR camera with automatic switching {DUAL IR CAMERA FOR AUTO-SWITCHING}

The present invention relates to an infrared camera capable of photographing at night using infrared ray (IR) LEDs, and in particular, has a daytime color CCD and a nighttime monochrome CCD, respectively. The present invention relates to a dual infrared camera capable of always capturing an optimal clear image by automatically switching and operating according to the amount of light.

In general, security surveillance cameras (closed circuit television cameras) photograph certain places or objects that are far away and send them to the closed circuit television so that abnormalities of the photographed places or objects can be checked on the closed circuit television without going to the field. As a photographing device, a variety of uses have been diversified in buildings, parking lots, apartment complexes, and the like, as well as general surveillance cameras for improving the efficiency of management and expenses, as well as automobile safety devices.

Recent security surveillance cameras are generally equipped with a plurality of Infrared Rays Light Emitting Diodes (IR LEDs) that supplement the amount of light of the lens by irradiating infrared rays forward from both sides of the lens, thereby recognizing human vision. Even in the dark night without a separate lighting device can be performed security surveillance.

The camera industry replaced the conventional film camera and changed to a digital camera using a charge-coupled device (CCD) device.

The CCD is an abbreviation of the term meaning a solid-state image pickup device, and is a 6mm x 4mm photoelectric conversion sensor that converts light into an electrical signal, and its structure stores a photoelectric conversion portion and a converted charge that convert light into an electrical signal. It is divided into a 'transmission part' that transmits, and the operation principle shows that the intensity of light from the lens is first recorded on the CCD (which is the film of the optical camera), and the light of the captured image is the RGB color attached to the CCD. The filter is separated into different colors.

The separated color is then converted into an electrical signal from the hundreds of thousands of optical sensors that make up the CCD (410,000 pixel digital cameras have 410,000 optical sensors attached to it). It is converted into digital signals of 0 and 1 to produce an image signal, which is displayed on a monitor.

On the other hand, the conventional security surveillance camera (Day Night) using a color CCD at the same time during the day and night, reproduces the image in color during the day and the image recorded in color at night is switched to the monochrome mode by software to be.

However, in general, the sensitivity characteristic of color CCD is 1.5 (LUX), and the monochrome CCD is 0.15 (LUX). When shooting at night, the color CCD shows a much lower image than the monochrome CCD. While there was an advantage of displaying vivid color reproducibility during daytime photography, color noise caused by color burst appeared during nighttime photography, which prevented the camera from properly serving as a surveillance camera. As a result, problems caused by focus shift due to different wavelengths of visible and infrared bands have occurred.

The color burst is a specific signal component having several periods in front of the video signal, and is used as a reference signal indicating gain of the color video signal. Rather, it acts as color noise.

The present invention has been made to solve the above problems, in the infrared camera that can be photographed at night by using an IR LED, it is equipped with a daytime color CCD and nighttime black and white CCD, respectively, in the amount of ambient light in the CdS circuit portion Generates a predetermined current value, and selectively operates the color CCD and the monochrome CCD according to the current value, and during the monochrome CCD operation to remove the color burst signal through the color killer circuit can always capture the optimal clear image The purpose is to provide a dual IR camera.

1 is a block diagram schematically showing the configuration of a dual infrared camera with an automatic switching function according to the present invention,

FIG. 2 is a circuit diagram schematically illustrating a CdS circuit part implementing a switching function as an embodiment of the present invention; FIG.

Figure 3 is an exploded perspective view schematically showing a dual infrared camera according to the present invention,

4 is a perspective view schematically showing a dual infrared camera according to the present invention.

<Brief description of symbols for the main parts of the drawings>

6: IR LED 8: CCD Module

16: camera module

20: Color CCD 21: Color CCD Lens

30: monochrome CCD (B / W CCD) 31: lens for monochrome CCD

40: CdS circuit part 41: CdS

42: monochrome CCD switch 43: color CCD switch

44: color killer switch

50: AGC 60: DSP

61: EEPROM 70: EVR

80: S-VIDEO AMP 81: VIDEO OUT

100: dual IR camera

The dual IR camera with an automatic switching function according to the present invention comprises a CdS circuit unit for generating a predetermined electrical signal through the CdS according to the amount of ambient light to switch the power control of the IR LED, monochrome CCD and color CCD; An IR LED illuminating the front by emitting infrared rays according to the control signal of the CdS circuit unit; A color CCD and a black and white CCD operated according to a control signal of the CdS circuit unit and selectively photographing the front side during the day or at night; An AGC (Auto Gain Control) for automatically controlling the gain of the analog signal transmitted from the color CCD or the monochrome CCD; A digital signal processor (DSP) for converting a signal controlled by the AGC into a video signal from which noise is removed by comparing with a data value stored in an EEPROM; An Electric Variable Resister (EVR) for optimizing the gain of the AGC by feedback controlling the AGC by the signal output from the DSP; S-amplifies the video signal converted by the DSP and outputs it to the monitor, and includes a color killer circuit integrally removing a color burst when a color killer control signal is transmitted from the CdS circuit unit. It is composed of VIDEO AMP.

Hereinafter, the present invention will be described in detail by the accompanying drawings.

1 is a block diagram schematically showing the configuration of a dual infrared camera equipped with an automatic switching function according to the present invention, Figure 2 is a circuit diagram schematically showing a CdS circuit unit for implementing a switching function as an embodiment of the present invention, Figure 3 is an exploded perspective view schematically showing a dual infrared camera according to the present invention, Figure 4 is a perspective view schematically showing a dual infrared camera according to the present invention.

In the present invention, a color CCD for reproducing 480 TV lines and a black and white CCD for reproducing 600 TV lines is used as an example of the color pixel 410K.

As shown in FIG. 1, ambient light is detected by the CdS 41 of the CdS circuit part 40, and the CdS circuit part 40 is generated in a specific control signal during the day according to the amount of light in the color CCD 20. At night, other control signals are generated to drive the black and white CCD 30 and at the same time, the color burst is generated in the video signal through the S-VIDEO AMP 80 to generate color noise. Burst) will be removed.

In addition, the CCD (20, 30) converts the signal of the light into an electrical signal and transfers it to the AGC (Auto Gain Control) (50), the AGC (50) feedback through the EVR (Electric Variable Resister) (70) Through the process, various gains are optimally controlled according to the amount of light incident on the CCDs 20 and 30 and input to the DSP (Digital Signal Processor) 60.

The DSP 60 converts a signal input from the AGC 50 into a digital signal, compares the data with the data stored in the EEPROM 61, and performs a specific signal conversion process corresponding to the data of the EEPROM 61. Signal processing of the video signal transmitted through 20, 30 is performed.

The video signal processed by the DSP 60 is output to the final monitor (not shown) through the VIDEO OUT 81 through a signal conversion process such as amplification and noise removal through the S-VIDEO AMP 80.

The S-VIDEO AMP 80 is a kind of image amplifier IC used as an embodiment for amplifying a video signal in the present invention. In the present invention, the Y signal amplification is 6dB, the C signal amplification is 10dB, and the composite signal is 6dB. At the same time, it uses MITSUMI's product with a chroma mute input to remove color burst at port 6.

That is, at night, the color CCD 20 is switched off by switching according to the control signal of the CdS circuit unit 40, the monochrome CCD 30 is turned on and the simultaneous IR LED 6 is turned on. Since the light is turned on, the camera captures an image of the front by infrared light emitted from the IR LED 6 and outputs it through the final monitor.

In addition, when the monochrome CCD 30 is turned ON, the control signal output from the CdS circuit unit 40 is simultaneously transmitted to a specific terminal of the S-VIDEO AMP 80 to operate as a burst mute signal. Done. Since the S-VIDEO AMP 80 has its own color killer circuit implemented therein, the color killer circuit removes color noise on the video signal, which is superior to the conventional color CCD 20 at night. It will provide picture quality.

As an example, the present invention employs a dual 1/3 ˝ 410,000 pixel SONY Super HAD IT CCD, adopts a color-only CCD and a monochrome-only CCD, so that the color mode is above 10 Lux and the monochrome mode is below 10 Lux. Black / White Mode), and especially in the black-and-white mode, a large number of infrared LEDs (the maximum visible distance varies depending on the number of LEDs) are turned on and the color killer circuit implemented in the S-VIDEO AMP ( The color killer circuit mutes the burst signal.

In addition, by adopting the CCD for day and night, the resolution of the color mode using the color CCD 20 is higher than or equal to 480 TV lines of horizontal resolution, and the black and white mode using the black and white CCD 30 (B / W Mode). 'S resolution is clearer than 600TV line.

Meanwhile, as an embodiment of the present invention, a CdS circuit part 40 including a plurality of transistors is proposed to implement a switching action, and the electrical signal generated from the CdS 41 is represented by the 'H' according to the reference value (reference value). Since the high signal and the low signal, the CdS circuit part 40 performs a predetermined switching operation according to the 'H' or 'L' signal of the CdS 41.

The CdS circuit part 40 connects the monochrome CCD switch 42 composed of an even number of transistors and the color CCD switch 43 composed of an odd number of transistors in parallel to connect the monochrome CCD switch 42 and the color CCD switch ( 43 is configured to have different output values for the same input value, and includes a color killer switch 44 for generating a color killer control signal in association with the monochrome CCD switch 42.

That is, the transistor (NPN type or PNP type) performs an operation as a kind of electronic switch to switch the output of the collector terminal on or off by the control current transmitted to the base terminal. In the present invention, the monochrome CCD switch 42 An even number of transistors are used for an odd number, and an odd number of transistors are used for a color CCD switch 43.

Therefore, when the 'L' signal is input from the CdS 41, the black and white CCD switch 42 is set to 'L', the color CCD switch 43 is set to 'H', and the color killer switch 44 is set to 'L'. The color CCD 20 is operated only by switching.

In addition, when the 'H' signal is input from the CdS 41, the black and white CCD switch 42 is set to 'H', the color CCD switch 43 is set to 'L', and the color killer switch 44 is set to 'H'. The black and white CCD 30 is operated to remove the burst signal through a color killer circuit (not shown) implemented in the S-VIDEO AMP 80.

Hereinafter, according to the circuit diagram shown in FIG. 2, a 'L (Low)' signal is output from the CdS 41 during daytime (when a predetermined amount of light is incident on the CdS circuit part), and at night (less than a predetermined amount of light is transmitted to the CdS). In the case of incident), the switching control operation of the CdS circuit unit 40 will be described based on the output of the 'H (High)' signal from the CdS 41.

First, when the control signal is transmitted to the base B of the transistor Q13 by outputting the 'L' signal from the CdS 41 during the day, the collector C generates a 'H' signal and the 'H' signal. Thus, the collector of transistor Q14 generates an 'L' signal.

The 'L' signal of Q14 is transmitted to three places.

First, the 'L' signal of Q14 is transmitted to the base of transistor Q3 to generate a 'H' signal to the collector of Q3, and the 'H' signal is transmitted to the base of transistor Q2, and by the 'H' signal Since the 'L' signal is transmitted to the monochrome CCD switch 42 connected to the collector of Q2, the monochrome CCD 30 is switched to the OFF state.

Secondly, the 'L' signal of Q14 is transmitted to the base of transistor Q6 to generate a 'H' signal to the collector of Q6, and the 'H' signal is transmitted to the base of transistor Q5 and the 'L' signal to the collector of Q5. Since the 'H' signal is transmitted to the color CCD switch 43 connected to the collector of Q4 by the 'L' signal, 15V power is supplied to turn the color CCD 20 to the ON state. .

Third, the 'L' signal of Q14 is input to pin 6 of the S-VIDEO AMP 80 which performs the role of the color killer switch 44, but is not an operation signal, so the color killer circuit does not operate.

On the other hand, at night, the operation is opposite to the daytime.

That is, when the control current is transmitted to the base B of the transistor Q13 by outputting the 'H' signal from the CdS 41, the collector C generates a 'L' signal and the transistor is generated by the 'L' signal. The collector of Q14 generates an 'H' signal.

The 'H' signal of Q14 is transmitted to three places.

First, the 'H' signal of Q14 is transmitted to the base of transistor Q3 to generate an 'L' signal to the collector of Q3, and the 'L' signal is transmitted to the base of transistor Q2, and by the 'L' signal Since the 'H' signal is transmitted to the monochrome CCD switch 42 connected to the collector of Q2, 15V power is supplied to turn the monochrome CCD 30 on.

Second, the 'H' signal of Q14 is transmitted to the base of transistor Q6 to generate an 'L' signal to the collector of Q6, and the 'L' signal is transmitted to the base of transistor Q5 to give the 'H' signal to the collector of Q5. And the 'L' signal is transmitted to the color CCD switch 43 connected to the collector of Q4 by the 'H' signal, so that the color CCD 20 is turned off.

Third, the 'H' signal of Q14 is input to pin 6 of the S-VIDEO AMP 80 which performs the role of the color killer switch 44 to generate a color killer control signal to operate the color killer circuit. The burst signal carried in the video signal is removed by the killer circuit.

On the other hand, the CdS circuit unit 40 turns on the color CCD 20 by outputting '1' when the amount of light incident on the CdS 41 is greater than or equal to the reference value, and outputs '0' when it is less than or equal to the reference value. The switching circuit may be configured by a microcomputer (not shown) that turns on the CCD 30 and generates a color killer control signal, and a separate A / D converter may be added if necessary.

In addition, the switching between the color CCD 20 and the black and white CCD 30 as described above using other switching elements other than the transistor and the microcomputer are all within the scope of the present invention.

3 and 4 is an exploded perspective view and a combined perspective view schematically showing a dual IR camera 100 with an automatic switching function according to the present invention.

The outer case for embedding the CCD module 8 and the camera module 16 is composed of a front case (1) and a rear case (10), screwed together with the case rubber ring (9) in between, and The front rubber ring 2, the window 3 and the assembly ring 4 are coupled to the front end of the front case 1. The inner circumference of the front case 1 is formed with a first end 15 in which the front rubber ring 2 is accommodated, the outer surface of the assembly ring 4 and the inner surface of the front case 1. The screw coupling portion for screwing together is formed in the.

On the other hand, the inner circumference of the rear case 10 has a structure that accommodates the CCD module 8 and the camera module 16, the CCD module 8 is a color CCD 20 and the monochrome CCD 30 It is formed separately, and accordingly the camera lens is formed by dividing the lens 21 for the color CCD and the lens 31 for monochrome CCD, the CCD module 8 and the camera module 16 is connected by a cable The signal is sent.

In addition, a second end 17 is formed on the inner surface for accommodating the frame between the CCD module 8 and the camera module 16, and adjacent to the holder ring 7 is coupled to the side. It becomes to be able to fix more surely. To this end, a screw coupling part is formed on an inner surface of the rear case 10 and an outer surface of the holder ring 7 so that the frame of the CCD camera module 8 does not loosen inside the rear case 10. The diagonal length needs to substantially match the diameter of the inner surface of the front end of the rear case 10.

In addition, a waterproof nut 12 coupled to the power cable 13 penetrating portion 19 of the rear case 10 via the waterproof rubber holder 11 is added to ensure waterproofing of the portion where the cable penetrates. It can be done.

In addition, the IR LED (6) is integrally installed so as to illuminate the front at night, the mounting plate 15 is formed by inserting a slight end in the circumferential direction to the front end of the camera holder ring (7) In addition, the lens hood 5 is disposed around the lenses 21 and 31 to prevent infrared rays from the IR LED 6 from being reflected by the window 3 to prevent light from being introduced into the lenses 21 and 31. It is good to make sure.

The front case 1 or the rear case 10 is formed with a bracket fixing screw 14 having a shape of a groove, it is possible to be fixed to an external support (such as ceiling or frame) through a bracket (not shown). have.

Dual IR camera equipped with an automatic switching function according to the present invention is equipped with a daytime color CCD 20 and a nighttime black and white CCD (30), respectively, in the CdS circuit unit 40, depending on the amount of ambient light color CCD ( 20) and the monochrome CCD 30, and when the monochrome CCD 30 operates, the color burst signal that generates color noise is removed through the color killer circuit, so that the color CCD is removed during the day and the color noise is removed at night. The black and white CCD is automatically switched to operate, so that it is possible to always capture the optimal clear image.

In addition, by providing two CCDs 20 and 30 for day and night in one DSP 60 and the case 10, there is an effect that the problem of focus shift due to different wavelengths of visible and infrared bands does not occur at all. .

Claims (3)

In the security surveillance camera, A CdS circuit unit for generating a predetermined electrical signal through the CdS according to the amount of ambient light and switching the power of the IR LED, the monochrome CCD, and the color CCD; An IR LED illuminating the front by emitting infrared rays according to the control signal of the CdS circuit unit; A color CCD and a black and white CCD operated according to a control signal of the CdS circuit unit and selectively photographing the front side during the day or at night; An AGC (Auto Gain Control) for automatically controlling the gain of the analog signal transmitted from the color CCD or the monochrome CCD; A digital signal processor (DSP) for converting a signal controlled by the AGC into a video signal from which noise is removed by comparing with a data value stored in an EEPROM; An Electric Variable Resister (EVR) for optimizing the gain of the AGC by feedback controlling the AGC by the signal output from the DSP; S that amplifies the image signal converted by the DSP and outputs it to the monitor, and includes a color killer circuit (Color killer circuit) for removing a color burst when the color killer control signal is transmitted from the CdS circuit unit -Dual IR camera with automatic switching function, characterized by consisting of VIDEO AMP. The method of claim 1, The CdS circuit part is configured such that the monochrome CCD switch and the color CCD switch composed of an odd number of transistors and the odd number of transistors are connected in parallel so that the monochrome CCD switch and the color CCD switch have different output values for the same input value. Is done; And a color killer switch for generating a color killer control signal in association with the black and white CCD switch. The method of claim 1, The CdS circuit unit turns on the color CCD by outputting '1' when the amount of light incident on the CdS is greater than or equal to the reference value. Dual IR camera with an automatic switching function, characterized in that it comprises a microcomputer for generating a signal.