KR960008398B1 - Noise removing system at a low luminance of a camcorder - Google Patents
Noise removing system at a low luminance of a camcorder Download PDFInfo
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- KR960008398B1 KR960008398B1 KR1019920023407A KR920023407A KR960008398B1 KR 960008398 B1 KR960008398 B1 KR 960008398B1 KR 1019920023407 A KR1019920023407 A KR 1019920023407A KR 920023407 A KR920023407 A KR 920023407A KR 960008398 B1 KR960008398 B1 KR 960008398B1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/68—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits
- H04N9/69—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits for modifying the colour signals by gamma correction
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase
- H04N9/78—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase for separating the brightness signal or the chrominance signal from the colour television signal, e.g. using comb filter
Abstract
Description
제1도는 종래 캠코더의 휘도신호 처리 시스템 구성도.1 is a configuration diagram of a luminance signal processing system of a conventional camcorder.
제2도는 본 발명 캠코더의 휘도신호 처리 시스템 구성도.2 is a configuration diagram of a luminance signal processing system of a camcorder of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 촬상관 2 : 자동이득제어 및 상호연관 샘플링부1: Imager 2: Automatic Gain Control and Correlated Sampling Unit
3 : 휘도/색도분리부 4 : 감마보정 및 라인지연부3: luminance / chromatic separation unit 4: gamma correction and line delay unit
5 : 엔코더부 6 : 마이콤5: encoder part 6: microcomputer
7 : 스위치 8 : 흑레벨클립 및 이득조절부7: switch 8: black level clip and gain control unit
9 : 비디오선택부9: Video selector
본 발명은 카메라 일체형 브이씨알(이하 캠코더라 약칭함)의 저조도시 카메라 신호에 대한 노이즈(Noise) 감소에 관한 것으로, 특히 조도상태 및 배경의 명암에 따라 변화하는 자동이득 제어신호를 이용, 노이즈성분이 일정레벨 이상일 경우 자동으로 클립시켜 화질을 향상시키도록 하는 캠코더의 저조도시 노이즈제거 시스템에 관한 것이다.The present invention relates to noise reduction for low-light camera signals of a camera integrated V-Cal (hereinafter referred to as a camcorder). In particular, the present invention relates to a noise component using an automatic gain control signal that changes according to illumination conditions and background contrast. It is related with a low-noise noise reduction system of a camcorder to automatically clip when a predetermined level or more is improved.
종래 캠코더의 휘도신호 처리 시스템은 첨부된 도면 제1도에 도시된 바와같이, 포커스렌즈를 통한 피사체의 광신호를 촬상영상신호로 변환하는 촬상관(1)과, 상기 촬상관(1)로부터 촬상된 영상신호의 이득을 조절하고 샘플링하여 출력하는 자동이득제어 및 상호연관 샘플링부(2)와, 상기 샘플링된 영상신호를 휘도신호(Y)와 색신호(C)로분리하여 출력하는 휘도/색도분리부(3)와, 상기 촬상관(1)의 특성에 의해 변화된 휘도신호를 휘도/색도분리부(3)으로부터 입력받아 원래의 휘도신호에 맞게 보정하고 이를 한하인(1H) 지연시켜 출력하는 감마보정 및 라인지연부(4)와, 상기 감마보정 및 라인지연부(4)의 출력 휘도신호를 엔코딩하여 화면영상신호로 출력하는 엔코더부(5)로 구성되어 있다.The luminance signal processing system of a conventional camcorder includes an image capturing tube 1 for converting an optical signal of a subject through a focus lens into a captured image signal, as shown in FIG. 1 of the accompanying drawings, and an image captured from the image capturing tube 1. Automatic gain control and correlation sampling unit 2 for adjusting, sampling and outputting the gain of the signal, and luminance / chromatic separation unit for separating and outputting the sampled video signal into luminance signal Y and color signal C. 3) and gamma correction and line for receiving the luminance signal changed by the characteristics of the image pickup tube 1 from the luminance / chromatic separation unit 3, correcting it according to the original luminance signal, and delaying and outputting the lower limit (1H). A delay section 4 and an encoder section 5 for encoding the output luminance signals of the gamma correction and line delay section 4 and outputting them as screen image signals.
이와같이 구성된 종래 캠코더의 휘도신호 처리 시스템은 먼저 피사체의 광신호가 포커스렌즈와 조리개(도면에 미도시)를 통하여 촬상관(1)에 입력되면 촬상관(1)은 입력된 피사체의 광신호를 촬상영상신호로 변환하여 자동이득제어 및 상호연관 샘플링부(2)에 입력하게 된다.상기 자동이득제어 및 상호연관 샘플링부(2)는 입력된 촬상영상신호의 이득을 조절하고 샘플링하여 노이즈 성분을 제거한 후 휘도/색도분리부(3)에 입력하게 되고, 상기 휘도/색도분리부(3)는 이득조절 및 샘플링된 영상신호를 휘도신호(Y)와 색도신호(C)로 분리하여 출력하게 된다. 상기 휘도/색도분리부(3)에서 분리된 색신호는 크로마 처리부에서 색차신호(R-Y)(B-Y)로 처리되어 엔코더부(5)에 입력되고, 휘도신호(Y)는 감마보정 및 라인지연부(4)에 입력된다. 상기한 감마보정 및 라인지연부(4)는 상기 촬상관(1)의 특정에 의해 변화된 휘도신호를 휘도/색도분리부(3)로부터 입력받아 원래의 휘도신호에 비례되게 보정함과 아울러 1H(H:수평귀선기간) 지연시켜 엔코더부(5)에 입력하게 되고, 상기 엔코더부(5)는 입력된 휘도신호와 색차신호를 엔코딩하여 화면영상신호 및 순수한 휘도신호로 출력하게 된다.In the luminance signal processing system of the conventional camcorder configured as described above, the optical signal of the subject is first input to the imaging tube 1 through a focus lens and an aperture (not shown), and the imaging tube 1 converts the optical signal of the input subject into an image image signal. The automatic gain control and the correlation sampling unit 2 converts the gain of the input image signal and adjusts the sampling to remove the noise component. It is input to the chromaticity separator 3, and the luminance / chromaticity separator 3 separates the gain-adjusted and sampled image signal into a luminance signal Y and a chromaticity signal C and outputs them. The color signal separated by the luminance / chromatic separation unit 3 is processed as a color difference signal RY (BY) by the chroma processing unit and input to the encoder unit 5, and the luminance signal Y is subjected to the gamma correction and line delay unit ( 4) is entered. The gamma correction and line delay unit 4 receives the luminance signal changed by the specification of the image pickup tube 1 from the luminance / chromatic separation unit 3 and corrects the luminance signal proportionally to the original luminance signal, and also 1H (H The horizontal return line period is delayed and input to the encoder unit 5. The encoder unit 5 encodes the input luminance signal and the color difference signal and outputs the screen image signal and the pure luminance signal.
그러나 이와같은 종래 캠코더의 휘도신호 처리 시스템은 촬상관으로부터 입력된 촬상신호는 자동이득제어부체서 조도가 낮을 경우 하드웨어적으로 자동이득 제어전압이 상승함에 따라 이득이 증가되어 증폭되는데, 이때 순수한 촬상신호 뿐만 아니라 촬상신호 처리상 생기는 각종 노이즈도 함께 증폭되어 화면에 나타나므로 저조도시 화면에 악영향을 주게되는 문제점이 있있다.However, in the luminance signal processing system of the conventional camcorder, when the image pickup signal input from the image pickup tube is low in the auto gain control unit, the gain is increased and amplified as the auto gain control voltage increases in hardware. In addition, since various noises generated in the processing of the image pickup signal are also amplified and displayed on the screen, there is a problem that adversely affects the low light screen.
따라서 본 발명의 목적은 조도상태 및 배경의 명암에 따라 변화하는 자동이득 제어전압을 비교하여 설정된 임계전압보다 클 경우, 즉 저조도시 휘도신호에 대한 노이즈성분을 자동으로 클립시켜 화질의 개선을 향상시키도록 캠코더의 저조도시 노이즈제거 시스템을 제공함에 있다.Accordingly, an object of the present invention is to compare the automatic gain control voltage which varies according to the illumination condition and the contrast of the background, and to improve the quality of the image by automatically clipping the noise component for the low luminance luminance signal when it is larger than the set threshold voltage. To provide a low-noise noise reduction system of the camcorder.
이와같은 본 발명의 목적은 자동이득제어 및 샘플링수단을 통하고 휘도/색도분리수단을 통해 분리된 피사체의 휘도신호를 촬상 이전의 휘도신호에 비례되게 보정하고 이를 한라인 지연시켜 출력하는 감마보정 및 라인지연수단과, 조도상태 및 배경의 명암에 따라 변화되는 자동이득 제어전압을 자동이득 제어수단을 통해 입력받아 설정 임계전압과 비교판단하는 마이콤과, 상기 자동이득 제어전압 비교에 따른 마이콤의 제어신호에 의해 스위칭되는 스위칭수단과, 상기 스위칭수단의 온/오프에 따라 감마보정 및 라인지연수단의 휘도신호에서 불필요한 일정레벨 이하의 흑레벨부분을 클립시키고 이를 이득조절하여 출력하는 흑레벨클립 및 이득조절수단과, 상기 스위칭수단과 연동으로 스위칭되어 라인지연된 휘도신호와 일정레벨 클립된 휘도신호를 선택하여 엔코더수단을 통해 출력하는 비디오선택수단으로 이루어짐으로써, 달성되는 것으로, 이하 본 발며을 첨부한 도면에 의거 상세히 설명하면 다음과 같다.Such an object of the present invention is gamma correction for correcting the luminance signal of a subject separated through the automatic gain control and sampling means and the luminance / chromatic separation means in proportion to the luminance signal before imaging and outputting it by one line delay. A microcomputer that receives line delay means, an auto gain control voltage that changes according to illuminance conditions and background contrast, and compares the set threshold voltage with an auto gain control means; and a microcom control signal according to the comparison of the auto gain control voltage. A black level clip and a gain control to clip a black level part below a predetermined level or less in the luminance signal of the gamma correction and line delay means according to on / off of the switching means, and output it by controlling the gain. And a line delayed luminance signal and a constant level clipped luminance signal switched in conjunction with the switching means. Selected as constituted by any video selection means for outputting via the encoder means, to be achieved, or less will be described in detail based on the attached drawings to the myeoeul follows.
제2도는 본 발명 캠코더의 휘도신호 처리 시스템 구성도로서, 이에 도시한 바와같이, 포커스렌즈를 통한 피사체의 광신호를 촬상영상신호로 변환하는 촬상관(1)과, 상기 촬상관(1)으로부터 촬상된 영상신호의 이득을 조절하고 샘플링하여 출력하는 자동이득제어 및 상호연관 샘플링부(2)와, 상기 샘플링된 영상신호를 휘도신호(Y)와 색신호(C)로 분리하여 출력하는 휘도/색도분리부(3)와, 상기 촬상관(1)의 특성에 의해 변화된 휘도신호를 휘도/색도분리부(3)로부터 입력받아 원래의 휘도신호에 맞게 보정하고 이를 한라인(1H) 지연시켜 출력하는 감마보정 및 라인지연부(4)와, 조도상태 및 배경의 명암에 따라 변화되는 자동이득 제어전압을 자동이득 제어부(2)를 통해 입력받아 설정 임계전압과 비교판단하는 마이콤(6)과, 상기 자동이득 제어전압 비교에 따른 마이콤(6)의 제어신호에 의해 온/오프되는 스위치(7)와, 상기 스위치(7)의 온/오프에 따라 감마보정 및 라인지연부(4)의 휘도신호에서 불필요한 일정레벨 이하의 흑레벨부분을 클립시키고 이를 이득조절하여 출력하는 흑레벨클립 및 이득조절부(8)와, 상기 스위치(7)와 연동으로 스위칭되어 라인지연된 휘도신호와 일정레벨로 클립된 휘도신호를 선택하는 비디오선택부(9)와, 상기 선택된 휘도신호를 엔코딩하여 출력하는 엔코더부(5)로 구성한다.2 is a configuration diagram of a luminance signal processing system of a camcorder according to the present invention. As shown in FIG. 2, an image pickup tube 1 for converting an optical signal of a subject through a focus lens into a captured image signal and an image picked up from the image pickup tube 1 are shown. Automatic gain control and correlation sampling unit 2 for adjusting, sampling and outputting the gain of an image signal, and a luminance / chromatic separation unit for separating and outputting the sampled image signal into a luminance signal Y and a color signal C. (3) and gamma correction which receives the luminance signal changed by the characteristics of the image pickup tube 1 from the luminance / chromatic separation unit 3 and corrects it according to the original luminance signal, and delays and outputs it by one line (1H); A microcomputer 6 for receiving a line delay unit 4, an automatic gain control voltage which is changed according to the illumination condition and the contrast of the background through the automatic gain control unit 2, and comparing and determining the threshold voltage with a set threshold voltage; According to voltage comparison A black level below a certain level that is unnecessary for the switch 7 turned on / off by the control signal of the microcomputer 6 and the luminance signal of the gamma correction and line delay unit 4 according to the on / off of the switch 7. A black level clip and gain control unit 8 for clipping a part and outputting the gain control unit, and a video selection unit for switching a line delayed luminance signal and a luminance signal clipped to a predetermined level by switching with the switch 7. (9) and an encoder section 5 for encoding and outputting the selected luminance signal.
이와같이 구성된 본 발명의 작용, 효과를 상세히 설명하면 다음과 같다.Referring to the operation, effects of the present invention configured as described above in detail.
먼저 피사체의 관신호가 포커스렌즈와 조리개를 통하여 촬상관(1)에 입력되면 촬상관(1)은 입력된 피사체의 광신호를 촬상영상신호로 변환하여 자동이득제어 및 상호연관 샘플링부(2)에 입력하게 된다. 상기자동이득제어 및 상호연관 샘플링부(2)는 입력된 촬상영상신호의 이득을 조절하고 샘플링하여 노이즈 성분을 제거한 후 휘도/색도분리부(3)에 입력하게 되고, 상기 휘도/색도분리부(3)는 이득조절 및 샘플링된 영상신호를 휘도신호(Y)와 색도신호(C)로 분리하여 출력하게 된다. 상기 휘도/색도분리부(3)에서 분리된 색신호는 크로마처리부(도면에 미도시)에서 R-Y, B-Y의 색차신호로 신호처리되어 엔코더부(5)에 입력되고, 또한 상기 분리된 휘도신호(Y)는 감마보정 및 라인지연부(4)에 입력된다. 상기한 감마보정 및 라인지연부(4)는 상기 촬상관(1)의 특성에 의해 변화된 휘도신호를 휘도/색도분리부(3)로부터 입력받아 원래의 휘도신호에 비례되게 보정함과 아울러 1H 지연시켜 비디오선택부(9)의 고정단자(a) 및 스위치(7)에 입력하게 된다.First, when the tube signal of the subject is input to the imaging tube 1 through the focus lens and the aperture, the imaging tube 1 converts the optical signal of the input subject into a captured image signal and inputs it to the automatic gain control and the correlation sampling unit 2. Done. The automatic gain control and correlation sampling unit 2 adjusts and samples the gain of the input captured image signal, removes noise components, and inputs the same to the luminance / chromat separator 3. 3) the gain control and the sampled video signal are separated into a luminance signal (Y) and a chroma signal (C) and output. The color signal separated by the luminance / chromatic separation unit 3 is processed into a color difference signal of RY and BY by a chroma processing unit (not shown in the drawing) and input to the encoder unit 5, and the separated luminance signal Y ) Is input to the gamma correction and line delay unit 4. The gamma correction and line delay unit 4 receives the luminance signal changed by the characteristics of the image pickup tube 1 from the luminance / chromatic separation unit 3, corrects it in proportion to the original luminance signal, and delays 1H. Input to the fixed terminal (a) and the switch (7) of the video selection unit (9).
이때, 마이콤(6)은 조도의 정도를 확인할 수 있는 자동이득 제어전압(AGCV)을 자동이득제어부(2)로부터 읽어들여 설정된 임계레벨값과 비교하게 된다. 상기 비교결과 자동이득 제어전압(AGCV)이 임계레벨값보다 크면 즉, 이때는 피사체의 주위가 저조도이기 때문에 촬상영상신호뿐만 아니라 각종 노이즈가 자동이득제어부(2)를 통해 증폭되어 화면에 나타나므로 이를 제거하기 위하여 마이콤(6)은 스위치(7)를 턴-온시키고, 아울러 비디오선택부(9)의 가동단자(c)를 고정단자(b)로 접속시켜 감마보정 및 라인지연부(4)의 휘도신호를 스위치(7)를 통해 흑레벨클립 및 이득조절부(8)에 입력하게 된다. 따라서 상기한 흑레벨클립 및 이득조절부(8)는 스위치(7)를 통한 휘도신호에서 불필요한 흑레벨부분(즉, 잡음)을 클립시키고 이를 이득조절하여 비디오선택부(9)의 고정단자(b)및 가동단자(c)를 통해 엔코더부(5)에 입력하게 된다. 상기 엔코더부(5)는 노이즈가 제거되어 비디오선택부(9)를 통해 입력된 일정레벨의 휘도신호와 색차신호(R-Y)(B-Y)를 엔코딩하여 화면영상신호로 출력함과 아울러 순수한 휘도신호로 출력하게 된다.At this time, the microcomputer 6 reads the automatic gain control voltage AGCV which can confirm the degree of illuminance from the automatic gain control unit 2 and compares it with the set threshold level value. As a result of the comparison, when the automatic gain control voltage AGCV is larger than the threshold level, that is, since the surroundings of the subject are low light, various noises as well as the captured image signal are amplified by the automatic gain control unit 2 and displayed on the screen. The microcomputer 6 turns on the switch 7 and connects the movable terminal c of the video selection unit 9 to the fixed terminal b so that the gamma correction and the luminance of the line delay unit 4 are performed. The signal is inputted to the black level clip and the gain control unit 8 through the switch 7. Therefore, the black level clip and gain control unit 8 clips the unnecessary black level portion (ie, noise) in the luminance signal through the switch 7 and adjusts the gain to fix the terminal b of the video selector 9. And input to the encoder (5) through the movable terminal (c). The encoder 5 removes noise, encodes a luminance signal and a color difference signal RY (BY) of a predetermined level input through the video selection unit 9, and outputs the screen image signal as a pure luminance signal. Will print.
이상에서 상세히 설명한 바와같이, 본 발명은 저조도상태 및 배경의 명암에 따라 변화하는 자동이득 제어전압을 비교하여 설정된 임계전압보다 클 경우 휘도신호에 포함된 노이즈성분을 자동으로 클립시킴으로써, 화질을 얻을 수 있는 효과가 있다.As described in detail above, the present invention compares the auto gain control voltage which varies according to the low light condition and the contrast of the background, and automatically clips the noise components included in the luminance signal when the threshold voltage is greater than the set threshold voltage, thereby obtaining image quality. It has an effect.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019920023407A KR960008398B1 (en) | 1992-12-05 | 1992-12-05 | Noise removing system at a low luminance of a camcorder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019920023407A KR960008398B1 (en) | 1992-12-05 | 1992-12-05 | Noise removing system at a low luminance of a camcorder |
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| Publication Number | Publication Date |
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| KR940017757A KR940017757A (en) | 1994-07-27 |
| KR960008398B1 true KR960008398B1 (en) | 1996-06-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1019920023407A KR960008398B1 (en) | 1992-12-05 | 1992-12-05 | Noise removing system at a low luminance of a camcorder |
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