KR200162792Y1 - An outline correcting circuit of a supervisory camera - Google Patents

An outline correcting circuit of a supervisory camera Download PDF

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Publication number
KR200162792Y1
KR200162792Y1 KR2019970015017U KR19970015017U KR200162792Y1 KR 200162792 Y1 KR200162792 Y1 KR 200162792Y1 KR 2019970015017 U KR2019970015017 U KR 2019970015017U KR 19970015017 U KR19970015017 U KR 19970015017U KR 200162792 Y1 KR200162792 Y1 KR 200162792Y1
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South Korea
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contour correction
image processing
terminal
processing element
input
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KR2019970015017U
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Korean (ko)
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KR19990001554U (en
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정정석
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권태웅
한국하니웰주식회사
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/14Picture signal circuitry for video frequency region
    • H04N5/20Circuitry for controlling amplitude response
    • H04N5/205Circuitry for controlling amplitude response for correcting amplitude versus frequency characteristic
    • H04N5/208Circuitry for controlling amplitude response for correcting amplitude versus frequency characteristic for compensating for attenuation of high frequency components, e.g. crispening, aperture distortion correction
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/14Picture signal circuitry for video frequency region
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/18Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)

Abstract

본 고안의 윤곽보정회로는 조도의 밝기에 따라 영상의 윤곽을 자동으로 보정하기 위한 것으로, 영상처리소자와 영상처리소자에 연결되어 자동이득제어신호를 반전증폭하여 다시 영상처리소자에 윤곽보정신호로 입력시키는 반전증폭회로로 구성된다. 반전증폭회로는 연산증폭기와 연산증폭기의 출력단자와 마이너스 입력단자를 연결하는 귀환저항으로 구성되며, 연산증폭기의 마이너스 입력단자로는 자동이득 제어신호가 입력되고 플러스 입력단자에는 기준전압이 입력된다.The contour correction circuit of the present invention is for automatically correcting the contour of an image according to the brightness of illuminance. The contour correction circuit is connected to the image processing element and the image processing element and inverted and amplified the automatic gain control signal to convert the contour correction signal to the image processing element. It consists of an inverted amplifier circuit for input. The inverting amplifier circuit consists of a feedback resistor connecting the operational amplifier and the output terminal of the operational amplifier and the negative input terminal. The automatic input control signal is input to the negative input terminal of the operational amplifier and the reference voltage is input to the positive input terminal.

Description

감시용 카메라의 윤곽보정회로Contour correction circuit of surveillance camera

본 고안은 감시용 카메라의 윤곽보정회로에 관한 것으로, 특히 조도에 따라 자동으로 영상의 윤곽을 보정하여 항상 선명한 화질을 구현할 수 있는 윤곽보정회로에 관한 것이다.The present invention relates to a contour correction circuit of a surveillance camera, and more particularly to a contour correction circuit that can always realize a clear picture quality by automatically correcting the contour of the image according to the illumination.

일반적으로, 은행이나 주차장 등에서 주로 사용되는 감시용 카메라는 선명한 영상을 얻기 위해서 영상신호처리시 윤곽보정신호를 발생시킨다. 도 1은 상기한 감시용 카메라의 윤곽보정회로를 나타내는 도면이다. 도면에 나타낸 바와 같이, 영상신호처리소자인 IR3Y17A1의 25번 핀에는 캐패시터(C1)와 가변저항기(VR1)가 접속되어 있다. 상기한 영상신호처리소자(1)의 26번 핀으로부터 신호가 입력되면, 25번 핀으로 입력되는 윤곽보정신호(V25)에 따라 윤곽보정이득이 생성된다. 도 2는 25번 핀으로 입력되는 전압(V25)에 따른 특성곡선을 나타내는 그래프이다. 도면에 나타낸 바와 같이, 영상처리소자(1)로 입력되는 윤곽보정전압이 증가함에 따라 생성되는 윤곽보정이득도 역시 커지는데, 일반적으로 조도가 높을 때에는 이득을 크게 하여 윤곽을 대폭적으로 보정해야만 하지만, 조도가 낮을 때에는 이득을 작게 하여 불필요한 잡음을 제거할 필요가 있다. 따라서, 도 1의 가변저항기(VR1)의 저항을 조정하면 이에 대응하는 윤곽보정전압값을 얻게 되어 일정한 이득값을 얻을 수 있게 된다.In general, a surveillance camera mainly used in a bank or a parking lot generates a contour correction signal during image signal processing to obtain a clear image. 1 is a view showing the contour correction circuit of the surveillance camera described above. As shown in the figure, a capacitor C1 and a variable resistor VR1 are connected to pin 25 of IR3Y17A1, which is a video signal processing element. When a signal is input from pin 26 of the image signal processing element 1, contour correction gain is generated according to the contour correction signal V 25 input to pin 25 . 2 is a graph showing a characteristic curve according to the voltage V 25 input to pin 25 . As shown in the figure, the contour correction gain generated also increases as the contour correction voltage input to the image processing element 1 increases. Generally, when the illumination is high, the contour must be largely corrected by increasing the gain. When the illuminance is low, it is necessary to reduce the gain to remove unnecessary noise. Therefore, when the resistance of the variable resistor VR1 of FIG. 1 is adjusted, a contour correction voltage value corresponding to the resistance is obtained, thereby obtaining a constant gain value.

그러나, 상기한 바와 같은 윤곽보정이득은 영상처리소자로 입력되는 윤곽보정전압(V25)의 제어에 따라 항상 일정한 이득만을 얻을 수 있기 때문에, 조도가 높을 때 선명한 영상을 얻기 위해 윤곽보정전압(V25)이 일정하게 조정되어 있으면, 조도가 낮을 때에는 불필요한 신호가 발생하여 화질이 저하되게 되는 문제가 있었다.However, since the contour correction gain as described above can always obtain only a constant gain under the control of the contour correction voltage V 25 input to the image processing element, the contour correction voltage V is obtained to obtain a clear image when the illumination is high. If 25 ) is constantly adjusted, there is a problem that an unnecessary signal is generated when the illuminance is low, resulting in deterioration of image quality.

본 고안은 상기한 문제를 해결하기 위해 제안된 것으로, 조도의 밝기에 따라 영상처리소자에 입력되는 윤곽보정신호를 자동으로 제어하여 이 신호에 의해 얻어지는 이득을 제어함으로써 항상 선명한 화질을 얻을 수 있는 감시용 카메라의 윤곽보정회로를 제공하는 것을 목적으로 한다.The present invention has been proposed to solve the above-mentioned problem, and it is possible to automatically control the contour correction signal input to the image processing element according to the brightness of illuminance to control the gain obtained by this signal so that a clear picture quality can always be obtained. An object of the present invention is to provide a contour correction circuit of a camera.

상기한 목적을 달성하기 위해, 본 고안의 감시용 카메라의 윤곽보정회로는 영상처리소자가 자동이득제어신호단자에 연결되고 상기한 자동이득제어신호단자로부터의 신호를 반전증폭하여 그 출력이 상기한 영상처리소자의 윤곽보정이득단자와 연결되는 윤곽보정회로를 구성한다. 반전증폭회로는 연산증폭기와 상기한 연산증폭기의 마이너스 입력단자와 출력단자를 사이에 연결된 귀환저항으로 구성되며, 연산증폭기의 마이너스 입력단자에는 영상처리소자의 자동이득제어신호가 입력되고 플러스 입력단자에는 기준전압이 입력된다.In order to achieve the above object, the contour correction circuit of the monitoring camera of the present invention has an image processing element connected to the automatic gain control signal terminal, and inverted amplified signal from the automatic gain control signal terminal, the output of which is described above. A contour correction circuit is connected to the contour correction gain terminal of the image processing device. The inverting amplifier circuit is composed of an operational amplifier and a feedback resistor connected between the negative input terminal and the output terminal of the operational amplifier.The negative input terminal of the operational amplifier is input with the automatic gain control signal of the image processing element and the positive input terminal. The reference voltage is input.

도 1은, 종래의 윤곽보정회로를 나타내는 도면.1 is a diagram showing a conventional contour correction circuit.

도 2는, 종래 윤곽보정신호의 특성곡선을 나타내는 그래프.2 is a graph showing a characteristic curve of a conventional contour correction signal.

도 3은, 본 고안에 따른 윤곽보정회로를 나타내는 도면.3 is a view showing a contour correction circuit according to the present invention.

도 4는, 본 고안에 따른 자동이득 제어신호의 특성곡선을 나타내는 그래프.Figure 4 is a graph showing the characteristic curve of the automatic gain control signal according to the present invention.

도 5는, 본 고안에 따른 자동이득 제어신화와 윤곽보정신호의 관계를 나타내는 그래프.5 is a graph showing the relationship between the automatic gain control myth and the contour correction signal according to the present invention.

이하, 첨부한 도면을 참조하여 본 고안에 따른 윤곽보정회로의 자동이득조절회로에 대해 상세히 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail the automatic gain control circuit of the contour correction circuit according to the present invention.

도 3은 본 고안의 윤곽보정회로를 나타내는 도면이다. 도면에 나타낸 바와 같이, IR3Y17A1 또는 IR3Y17B1로 이루어진 영상처리소자(1)의 39번 핀과 40번 핀이 저항 R1을 통해 연산증폭기(6)의 마이너스 입력단자에 접속되며, 5V의 기준전압이 저항 R2, R4를 거쳐 연산증폭기(6)의 플라스단자에 입력된다. 연산증폭기(1)의 출력단자와과 마이너스 입력단자 사이에는 귀환저황(R6)이 삽입되며, 상기한 연산증폭기(1)의 출력이 25번 핀에 연결되고 상기한 25번 핀이 다시 캐패시터(C1)에 연결된다.3 is a view showing a contour correction circuit of the present invention. As shown in the figure, pins 39 and 40 of the image processing element 1 consisting of IR3Y17A1 or IR3Y17B1 are connected to the negative input terminal of the operational amplifier 6 through a resistor R1, and a reference voltage of 5V is applied to the resistor R2. Is input to the plastic terminal of the operational amplifier 6 via R4. A feedback voltage (R6) is inserted between the output terminal of the operational amplifier (1) and the negative input terminal, the output of the operational amplifier (1) is connected to pin 25, and the pin 25 is again the capacitor (C1). Is connected to.

연산증폭기(6)의 39번 핀과 40번 핀에서 출력되는 전압은 자동이득제어(Auto Gain Control)전압(VAGC)으로 도 4에 나타낸 바와 같이 조도에 따라 약 1Vdc에서 4Vdc로 변화한다. 즉, AGC전압은 조도가 밝을 때는 약 1Vdc 이하로 되어 이득이 낮아지고 조도가 어두울 때는 약 4Vdc 정도가 되어 높은 이득을 얻게 된다. 이 신호를 반전증폭회로를 통하여 영상처리소자(1)의 25번 핀에 입력되는 윤곽보정전압(VAPA)으로 하면, 상기한 AGC전압과 APA전압의 관계는 도 5와 같이 된다. 즉, 도 5에 나타낸 바와 같이 AGC전압을 증가시키면, APA전압은 점점 감소하게 된다.The voltages output from pins 39 and 40 of the operational amplifier 6 vary from about 1 Vdc to 4 Vdc depending on the illuminance as shown in FIG. 4 as an auto gain control voltage V AGC . That is, the AGC voltage is about 1Vdc or less when the light intensity is low, and the gain is low, and about 4Vdc when the light intensity is dark, high gain is obtained. When this signal is set as the contour correction voltage V APA input to pin 25 of the image processing element 1 through the inverting amplifier circuit, the relationship between the AGC voltage and the APA voltage is as shown in FIG. That is, as shown in FIG. 5, when the AGC voltage is increased, the APA voltage gradually decreases.

반전증폭회로의 출력특성은 기준 전압을 공급받는 비반전 입력부의 전압(V1)과 귀환증폭도를 결정하는 저항 R1과 R2의 값에 의해 결정된다. 윤곽보정이득을 결정하는 전압(V0)은 수학식 1에 의해 변하게 된다.The output characteristics of the inverting amplifier circuit are determined by the voltages V1 and the resistances R1 and R2 that determine the feedback amplification of the non-inverting input portion supplied with the reference voltage. The voltage V 0 determining the contour correction gain is changed by Equation 1.

여기서, V1은 고정된 값이고 V2는 AGC 제어전압으로 V2의변화가 발생하면, 이에 역비례하는 특성을 얻게 된다.Here, V1 is a fixed value, and V 2 when the change in the V 2 generated by the AGC control voltage, thereby obtaining the property of inverse proportion thereto.

따라서, 도 3도에 나타낸 바와 같이 조도가 밝을 때, 1Vdc 이하의 AGC전압이 영상처리소자(1)로부터 출력하면, 약 4VAPA의 APA전압이 다시 영상처리소자(1)에 입력되며, 이 입력된 APA전압이 도 2의 윤곽보정이득 특성도에 이득이 약 -2로 커져서 화면의 윤곽을 대폭 보상한다. 반면에, 조도가 어두워지면 AGC전압이 약 4Vdc로 변화되고 이에 따라 APA전압이 약 1VAPA로 되어 도 2의 이득이 약 -6.5로 작아지게 되어 불필요한 잡음을 제거하게 된다.Therefore, as shown in FIG. 3, when the illuminance is bright, when an AGC voltage of 1 Vdc or less is output from the image processing element 1, an APA voltage of about 4 VAPA is inputted to the image processing element 1 again. The gain of the APA voltage increases to about -2 in the contour correction gain characteristic diagram of FIG. 2, thereby greatly compensating for the outline of the screen. On the other hand, when the illuminance becomes dark, the AGC voltage is changed to about 4Vdc and accordingly the APA voltage is about 1V APA , so that the gain of FIG. 2 is reduced to about -6.5 to remove unnecessary noise.

본 고안은 상기한 바와 같이, 영상처리소자에서 출력되는 AGC전압을 반전증폭회로에 의해 반전시켜 조도의 밝기에 따라 영상처리소자에 입력되는 APA전압을 제어함으로써, 자동으로 영상의 윤곽을 보정할 수 있게 된다.The present invention, as described above, by inverting the AGC voltage output from the image processing element by the inversion amplifier circuit to control the APA voltage input to the image processing element according to the brightness of the illumination, it is possible to automatically correct the outline of the image Will be.

Claims (2)

자동이득제어신호를 출력함과 동시에 입력되는 윤곽보정신호에 따라 윤곽보정이득을 결정하여 영상을 보정하는 영상처리소자를 사용하여 윤곽을 보정하는 감시용 카메라의 윤곽보정회로에 있어서, 상기한 영상처리처리소자의 자동이득제어신호단자에 연결되고 자동이득제어신호단자로부터의 신호를 반전증폭하여 그 출력이 상기한 영상처리소자의 윤곽보정이득단자와 연결되는 것을 특징으로 하는 감시용 카메라의 윤곽보정회로.In the contour correction circuit of a surveillance camera for correcting the contour using an image processing element for correcting an image by determining the contour correction gain according to the contour correction signal inputted at the same time as outputting the automatic gain control signal, the image processing described above. A contour correction circuit of a surveillance camera, which is connected to an automatic gain control signal terminal of a processing element and inverted and amplified from a signal of the automatic gain control signal terminal and its output is connected to the contour correction gain terminal of the image processing element. . 제1항에 있어서, 상기한 반전증폭회로가,The inverting amplifier circuit of claim 1, 출력단자가 상기한 영상처리소자의 윤곽보정이득단자에 연결되어, 마이너스 입력단자로 상기한 영상처리장치의 자동이득제어신호단자의 신호가 입력되고 플러스 입력단자로 기준 전압이 입력되는 연산증폭기와;An operational amplifier having an output terminal connected to the contour correction gain terminal of the image processing element, a signal of the automatic gain control signal terminal of the image processing apparatus being input to a negative input terminal, and a reference voltage being input to a positive input terminal; 상기한 연산증폭기의 마이너스 입력단자와 출력단자 사이에 접속된 귀환저항으로 구성된 것을 특징으로 하는 윤곽보정회로.And a feedback resistor connected between the negative input terminal and the output terminal of the operational amplifier.
KR2019970015017U 1997-06-20 1997-06-20 An outline correcting circuit of a supervisory camera KR200162792Y1 (en)

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