KR19990078850A - Camera - Google Patents
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- KR19990078850A KR19990078850A KR1019990033212A KR19990033212A KR19990078850A KR 19990078850 A KR19990078850 A KR 19990078850A KR 1019990033212 A KR1019990033212 A KR 1019990033212A KR 19990033212 A KR19990033212 A KR 19990033212A KR 19990078850 A KR19990078850 A KR 19990078850A
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- video signal
- outputting
- amplified
- cds
- ccd
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- 238000000034 method Methods 0.000 claims abstract description 16
- 238000005070 sampling Methods 0.000 claims abstract description 9
- 239000002131 composite material Substances 0.000 claims abstract description 5
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 238000005286 illumination Methods 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 230000035945 sensitivity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
- H01L27/144—Devices controlled by radiation
- H01L27/146—Imager structures
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Studio Devices (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
Abstract
불빛이 거의 없는 저조도에서 피사체의 관측을 가능하게 하는 감시 카메라에 관한 것이다. 이는 피사체의 영상신호를 출력하는 CCD(charge coupled device)와, 이 CCD로부터 출력된 영상신호를 샘플링하는 CDS IC(correclated doubled sampling IC)와, 이 CDS IC에서 샘플링된 영상신호를 증폭시키는 비디오 증폭부와, 증폭된 영상신호로부터 노이즈를 제거시키는 노이즈 감쇠부와, 증폭부에서 증폭된 영상신호전압과 설정된 기준전압을 비교하여 출력하는 비교부와, 이 비교부의 출력값에 따라 제어되어 감쇠부로부터의 영상신호와 CDS IC로부터의 영상신호를 선택적으로 출력하는 스위치부와, 이 스위치부로부터 선택된 영상신호를 복합영상신호로 출력하는 프로세스 IC를 구비한다. 이러한 감시용 카메라는 조도가 낮아져 어두워지면 증폭된 영상신호를 선택하여 프로세스 IC로 공급하고, 밝아지면 증폭되지 않은 영상신호를 선택하여 프로세스 IC로 공급함으로써, 저조도에서도 보다 선명한 화상으로 관측가능하게 한다.The present invention relates to a surveillance camera that enables observation of a subject in low light with little light. This includes a charge coupled device (CCD) for outputting a video signal of a subject, a correclated doubled sampling IC (CDS IC) for sampling the video signal output from the CCD, and a video amplifier for amplifying the video signal sampled by the CDS IC. A noise attenuator for removing noise from the amplified video signal, a comparator for comparing and outputting the amplified video signal voltage with a set reference voltage, and controlling the output value of the amplified video signal from the attenuator. And a switch IC for selectively outputting the signal and the video signal from the CDS IC, and a process IC for outputting the video signal selected from the switch as a composite video signal. Such a monitoring camera selects and supplies an amplified video signal to the process IC when the illumination becomes low and becomes dark, and selects and supplies an amplified video signal to the process IC when it becomes bright, so that a clearer image can be observed even in low light.
Description
본 발명은 저조도에서도 피사체의 영상을 선명하게 관측할 수 있도록 개량된 감시용 카메라에 관한 것이다.The present invention relates to an improved surveillance camera that can clearly observe an image of a subject even in low light.
통상적인 감시용 카메라는 도1에 도시된 바와 같이, CCD(charge coupled device;10)로부터 출력된 영상신호를 CDS IC(correclated doubled sampling IC;20)로 샘플링하여 노이즈가 제거된 영상신호를 만들고, 이를 프로세스 IC(process IC;30)로 처리하여 복합영상신호로 출력한다,As shown in FIG. 1, a conventional surveillance camera samples a video signal output from a charge coupled device (CCD) 10 with a correclated doubled sampling IC (CDS IC) 20 to produce a video signal without noise. This is processed by a process IC (process IC) 30 and output as a composite video signal,
이 과정에서 감시용 카메라의 감도가 결정되는 데, 이는 CCD 감도와 프로세스 IC의 AGC(auto gain control)에 의해 정하여지며, 보통 1-2lux(약 140mV)의 감도 특성을 가진다.In this process, the sensitivity of the surveillance camera is determined by the CCD sensitivity and auto gain control (AGC) of the process IC, and usually has a sensitivity of 1-2 lux (about 140 mV).
그러나 1-2lux 이하에서는 모니터 상에서 영상신호를 구별할 수 없는 정도로 화질이 극히 저하되는 문제점이 있다.However, below 1-2 lux, there is a problem that the image quality is extremely degraded to the extent that video signals cannot be distinguished on the monitor.
본 발명은 이러한 단점을 보완하기 위하여 안출된 것으로써, 1-2lux 이하 즉, 저조도하에서도 선명한 화상으로 관측할 수 있도록 CCD의 영산신호를 증폭하여 감도를 높인 감시용 카메라를 이룩하려는 데 그 과제가 있다.The present invention has been made to solve the above disadvantages, to achieve a surveillance camera having a high sensitivity by amplifying the Youngsan signal of the CCD so that it can be observed in a clear image even under 1-2lux, that is, low light. have.
도1은 통상의 칼라 감시용 카메라를 나타낸 개략적 블럭도,1 is a schematic block diagram showing a conventional color surveillance camera;
도2는 본 발명 감시용 카메라를 나타낸 블록도이다.2 is a block diagram showing a camera for monitoring the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
40...CCD 5O...CDS IC40 ... CCD 5O ... CDS IC
70...증폭부 80...노이즈 감쇠부70 ... amplification section 80 ... noise damping section
90...비교부 100...아날로그 스위치부90 ... Comparative 100 ... Analog switch
상기 목적을 달성하는 본 발명은 피사체의 영상신호를 출력하는 CCD(charge coupled device)와, 이 CCD로부터 출력된 영상신호를 샘플링하는 CDS IC(correclated doubled sampling IC)와, 이 CDS IC에서 샘플링된 영상신호를 증폭시키는 비디오 증폭부와, 증폭된 영상신호로부터 노이즈를 제거시키는 노이즈 감쇠부와, 증폭부에서 증폭된 영상신호전압과 설정된 기준전압을 비교하여 출력하는 비교부와, 이 비교부의 출력값에 따라 제어되어 상기 감쇠부로부터의 영상신호와 상기 CDS IC로부터의 영상신호를 선택적으로 출력하는 스위치부와, 이 스위치부로부터 선택된 영상신호를 복합영상신호로 출력하는 프로세스 IC를 구비하여 된 것을 특징으로 한다.The present invention achieves the above object, a charge coupled device (CCD) for outputting a video signal of a subject, a correclated doubled sampling IC (CCS) for sampling the video signal output from the CCD, and an image sampled by the CDS IC. A video amplifier for amplifying the signal, a noise attenuator for removing noise from the amplified video signal, a comparator for comparing and outputting the video signal voltage amplified by the amplifier and a set reference voltage, and according to the output value of the comparator And a switch unit for controlling and selectively outputting the video signal from the attenuator and the video signal from the CDS IC, and a process IC for outputting the video signal selected from the switch as a composite video signal. .
이러한 본 발명 감시용 카메라는 조도가 낮아져 어두워지면 증폭된 영상신호를 선택하여 프로세스 IC로 공급하고, 밝아지면 증폭되지 않은 영상신호를 선택하여 프로세스 IC로 공급함으로써, 저조도에서도 보다 선명한 화상으로 관측가능하게 한다.The surveillance camera of the present invention selects an amplified video signal to be supplied to the process IC when it is dark and becomes dark, and selects and supplies an amplified video signal to the process IC when it is dark, so that a clearer image can be observed even at low light. do.
이하 첨부된 도면을 참조하면서 본 발명에 따른 바람직한 실시예를 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
본 발명 감시용 카메라는 피사체의 영상신호를 출력하는 CCD(charge coupled device;40)와, 이 CCD(40)로부터 출력된 영상신호를 샘플링하는 CDS IC(correclated doubled sampling IC;50)와, 이 CDS IC(50)에서 샘플링된 영상신호를 증폭시키는 비디오 증폭부(70)와, 증폭된 영상신호로부터 노이즈를 제거시키는 노이즈 감쇠부(80)와, 증폭부(80)에서 증폭된 영상신호전압과 설정된 기준전압을 비교하여 출력하는 비교부(90)와, 이 비교부(90)의 출력값에 따라 제어되어 상기 감쇠부(80)로부터의 영상신호와 상기 CDS IC(50)로부터의 영상신호를 선택적으로 출력하는 스위치부(100)와, 이 스위치부(100)로부터 선택된 영상신호를 복합영상신호로 출력하는 프로세스 IC(110)로 이루어진다.The surveillance camera includes a CCD (charge coupled device) 40 for outputting a video signal of a subject, a CDS IC (correclated doubled sampling IC) 50 for sampling a video signal output from the CCD 40, and the CDS. The video amplifier 70 amplifies the video signal sampled by the IC 50, the noise attenuator 80 removes noise from the amplified video signal, and the video signal voltage amplified by the amplifier 80. A comparison unit 90 which compares and outputs a reference voltage, and is controlled according to the output value of the comparison unit 90 to selectively output the image signal from the attenuation unit 80 and the image signal from the CDS IC 50. And a switch IC 100 for outputting, and a process IC 110 for outputting the video signal selected by the switch 100 as a composite video signal.
이러한 감시용 카메라는 CCD(40)로부터 출력된 영상신호를 CDS IC(50)에서 샘플링된 영상신호는 버퍼(BUFFER;60)를 통해 비디오 증폭부(70)와 아날로그 스위치부(100)의 한 입력단으로 입력되고, 비디오 증폭부(70)에서는 입력된 영상신호를 약 20dB 증폭시킨다,The surveillance camera includes an image signal output from the CCD 40 and an image signal sampled by the CDS IC 50 through one buffer of the video amplifier 70 and the analog switch 100 through a buffer BUFFER 60. Input, and the video amplifier 70 amplifies the input video signal by about 20dB,
증폭된 영상신호는 노이즈 감쇠부(80)와 비교부(90)로 각각 공급되며, 노이즈 감쇠부(80)에서는 영상신호의 노이즈(noise)를 제거한후 아날로그 스위치부(100)의 다른 입력단으로 입력된다.The amplified video signal is supplied to the noise attenuator 80 and the comparator 90, respectively. The noise attenuator 80 removes noise of the video signal and then inputs it to the other input terminal of the analog switch unit 100. do.
그리고 비교부(90)에서는 설정된 기준전압과 증폭된 영상신호를 적분하여 만들어진 DC전압을 비교하여 출력한다. 이 비교부(90)의 출력전압은 아날로그 스위치부(100)의 어드레스(ADDRESS)를 제어함으로써, 증폭된 영상신호와 증폭되지 않은 영상신호를 선택하여 출력한다,The comparator 90 compares the DC voltage generated by integrating the set reference voltage with the amplified video signal and outputs the DC voltage. The output voltage of the comparison unit 90 controls the address ADDRESS of the analog switch unit 100 to select and output the amplified video signal and the non-amplified video signal.
이러한 감시용 카메라는 조도가 낮아져 어두워지면 증폭된 영상신호를 선택하여 프로세스 IC로 공급하고, 밝아지면 증폭되지 않은 영상신호를 선택하여 프로세스 IC로 공급함으로써, 저조도에서도 보다 선명한 화상으로 관측할 수 있다.Such a monitoring camera selects and supplies an amplified video signal to the process IC when the illumination intensity becomes low, and selects and supplies an amplified video signal to the process IC when it becomes bright, so that the image can be observed more clearly even in low light.
상술한 바와 같은 발명은 조도가 낮아져 어두워지면 증폭된 영상신호를 선택하여 프로세스 IC로 공급하고, 밝아지면 증폭되지 않은 영상신호를 선택하여 프로세스 IC로 공급함으로써, 저조도에서도 보다 선명한 화상으로 관측가능하게 한다.The above-described invention selects and supplies an amplified video signal to the process IC when the illumination becomes low and becomes dark, and selects and supplies an amplified video signal to the process IC when it becomes bright, so that a clearer image can be observed even at low illumination. .
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KR1019990033212A KR19990078850A (en) | 1999-08-03 | 1999-08-03 | Camera |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20030066163A (en) * | 2002-02-04 | 2003-08-09 | 전우현 | An imagine and environment information transport system |
KR100444329B1 (en) * | 2002-02-16 | 2004-08-16 | 주식회사 성진씨앤씨 | Digital video processing device eliminating the noise generated under insufficient illulmination |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04172782A (en) * | 1990-11-06 | 1992-06-19 | Matsushita Electric Ind Co Ltd | Video camera |
JPH09200626A (en) * | 1996-01-16 | 1997-07-31 | Rohm Co Ltd | Ccd camera |
KR19980067642A (en) * | 1997-02-06 | 1998-10-15 | 이대원 | High Sensitivity CD Camera |
KR19990085958A (en) * | 1998-05-23 | 1999-12-15 | 정환국 | Closed Circuit Camera with Improved Sensitivity |
-
1999
- 1999-08-03 KR KR1019990033212A patent/KR19990078850A/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04172782A (en) * | 1990-11-06 | 1992-06-19 | Matsushita Electric Ind Co Ltd | Video camera |
JPH09200626A (en) * | 1996-01-16 | 1997-07-31 | Rohm Co Ltd | Ccd camera |
KR19980067642A (en) * | 1997-02-06 | 1998-10-15 | 이대원 | High Sensitivity CD Camera |
KR19990085958A (en) * | 1998-05-23 | 1999-12-15 | 정환국 | Closed Circuit Camera with Improved Sensitivity |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20030066163A (en) * | 2002-02-04 | 2003-08-09 | 전우현 | An imagine and environment information transport system |
KR100444329B1 (en) * | 2002-02-16 | 2004-08-16 | 주식회사 성진씨앤씨 | Digital video processing device eliminating the noise generated under insufficient illulmination |
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