KR950007418A - Image Amplification Circuit and Image Quality Compensation Method - Google Patents

Image Amplification Circuit and Image Quality Compensation Method Download PDF

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Publication number
KR950007418A
KR950007418A KR1019930017545A KR930017545A KR950007418A KR 950007418 A KR950007418 A KR 950007418A KR 1019930017545 A KR1019930017545 A KR 1019930017545A KR 930017545 A KR930017545 A KR 930017545A KR 950007418 A KR950007418 A KR 950007418A
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South Korea
Prior art keywords
video signal
digital
image
signal
analog
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KR1019930017545A
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Korean (ko)
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KR0132874B1 (en
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류동기
송동일
이명환
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김광호
삼성전자 주식회사
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Publication of KR950007418A publication Critical patent/KR950007418A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/20—Circuitry for controlling amplitude response
    • H04N5/205—Circuitry for controlling amplitude response for correcting amplitude versus frequency characteristic
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/66—Digital/analogue converters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/57—Control of contrast or brightness

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

Abstract

본 발명은 영상증폭회로 및 화질보상방법에 관한 것으로, 특히 검파된 영상신호를 입력하여 증폭하는 입력 영상증폭부; 상기 증폭된 영상신호를 디지탈영상신호로 변환하기 위한 아날로그 디지탈 변환기; 상기 디지탈 영상신호를 매필드 단위로 입력하여 이전필드의 디지탈 영상신호로부터 추출한 보상함수에 따라 화질을 보상해서 보상된 디지탈 영상신호를 출력하는 디지탈 화질 보상부; 상기 보상된 디지탈 영상신호를 아날로그 영상신호로 변환하기 위한 디지탈 아날로그 변환기; 및 상기 아날로그 영상신호를 밝기 및 콘트라스트 조정에 따라 조정하고 증폭해서 출력하는 출력영상증폭부를 구비한 것을 특징으로 하는 영상증폭회로를 특징으로 한다.The present invention relates to an image amplification circuit and an image quality compensation method, and in particular, an input image amplifier for inputting and amplifying a detected image signal; An analog digital converter for converting the amplified video signal into a digital video signal; A digital image quality compensator for inputting the digital image signal in units of fields and compensating for image quality according to a compensation function extracted from a digital image signal of a previous field and outputting a compensated digital image signal; A digital analog converter for converting the compensated digital video signal into an analog video signal; And an output image amplifier for adjusting, amplifying and outputting the analog image signal according to brightness and contrast adjustments.

따라서, 본 발명은 화면의 통계적 특성에 따라 적응적으로 콘트라스트를 보상할 수 있다.Therefore, the present invention can adaptively compensate for contrast according to the statistical characteristics of the screen.

Description

영상 증폭 회로 및 화질 보상방법Image Amplification Circuit and Image Quality Compensation Method

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제4도는 본 발명에 의한 영상증폭 회로의 블럭도,4 is a block diagram of an image amplification circuit according to the present invention;

제5도는 제4도의 디지탈 화질 보상부의 일실시예의 구성도,5 is a configuration diagram of an embodiment of the digital image quality compensation unit of FIG.

제8도는 본 발명에 의한 화질 보상방법과 종래의 AB동작을 비교설명하기 위한 입출력 그래프 선도,8 is an input / output graph diagram for comparing and explaining the image quality compensation method according to the present invention and the conventional AB operation;

제9도는 본 발명에 의한 보상함수의 차수코드 산출방법을 나타낸 도면.9 is a diagram showing a method of calculating the order code of a compensation function according to the present invention.

Claims (3)

검파된 영상신호를 입력하여 증폭하는 입력 영상증폭부; 상기 증폭된 영상신호를 디지탈영상신호로 변환하기 위한 아날로그 디지탈 변환기; 상기 디지탈 영상신호를 매필드 단위로 입력하여 이전필드의 디지탈 영상신호로부터 추출한 보상함수에 따라 화질을 보상해서 보상된 디지탈 영상신호를 출력하는 디지탈 화질 보상부; 상기 보상된 디지탈 영상신호를 아날로그 영상신호로 변환하기 위한 디지탈 아날로그 변환기; 및 상기 아날로그 영상신호를 밝기 및 콘트라스트 조정에 따라 조정하고 증폭해서 출력하는 출력영상증폭부를 구비한 것을 특징으로 하는 영상증폭회로.An input image amplifier for inputting and amplifying the detected image signal; An analog digital converter for converting the amplified video signal into a digital video signal; A digital image quality compensator for inputting the digital image signal in units of fields and compensating for image quality according to a compensation function extracted from a digital image signal of a previous field and outputting a compensated digital image signal; A digital analog converter for converting the compensated digital video signal into an analog video signal; And an output image amplifier for adjusting, amplifying, and outputting the analog image signal according to brightness and contrast adjustments. 제1항에 있어서, 상기 디지탈 화질 보상부는 상기 이전필드의 디지탈 영상신호로 부터 계조도 히스토그램, 평균화면레벨 및 표준편차를 구하는 통계적 변수 산출부; 상기 평균화면레벨 및 표준편차와, 자동휘도제한신호에 따라 상기 보상함수를 결정하는 보상함수 결정부; 및 상기 보상함수에 의해 얻어진 룩업테이블에 의해 현재 입력되는 디지탈 영상신호의 화질을 보상해서 출력하는 보상출력부를 구비한 것을 특징으로 하는 영상증폭회로.2. The digital image processing apparatus of claim 1, wherein the digital image quality compensator comprises: a statistical variable calculator for obtaining a gray level histogram, an average screen level, and a standard deviation from a digital video signal of the previous field; A compensation function determining unit which determines the compensation function according to the average screen level and standard deviation and an automatic luminance limit signal; And a compensation output unit for compensating for and outputting an image quality of a digital video signal currently input by the lookup table obtained by the compensation function. 검파된 영상신호를 입력하여 증폭하고 증폭된 영상신호를 밝기 및 콘트라스트 조정에 따라 조정하고 증폭해서 출력하는 영상증폭회로의 화질보상방법에 있어서, 상기 증폭된 영상신호를 디지탈영상신호로 변환하는 단계; 상기 변환된 1필드의 디지탈 영상신호로부터 계조도 히스토그램 및 평균 화면레벨을 구하는 단계; 상기 구해진 계조도 히스토그램과 평균화면레벨에 의해 표준편차를 구하는 단계; 상기 구해진 표준편차 및 평균화면레벨과 자동휘도제한신호에 따라 차수를 결정하는 단계; 상기 결정된 차수와 평균화면레벨에 따라 보상함수를 발생하는 단계; 상기 발생된 보상함수로 부터 계조도 입력값들에 대한 함수값을 계산해서 록업테이블에 저장하는 단계; 및 상기 룩업테이블에 따라 현재 입력되는 디지탈 영상신호를 보상해서 출력하는 단계를 구비한 것을 특징으로 하는 화질보상방법.A video quality compensation method of an image amplification circuit which inputs and amplifies a detected video signal, adjusts and amplifies and outputs the amplified video signal according to brightness and contrast adjustments, the method comprising: converting the amplified video signal into a digital video signal; Obtaining a gradation histogram and an average screen level from the converted one-field digital video signal; Obtaining a standard deviation based on the obtained gray level histogram and the average screen level; Determining the order according to the obtained standard deviation and average screen level and automatic luminance limit signal; Generating a compensation function according to the determined order and average screen level; Calculating a function value for gray level input values from the generated compensation function and storing the function value in a lockup table; And compensating for and outputting a digital video signal currently input according to the lookup table. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930017545A 1993-08-31 1993-08-31 Image amplification circuit and picture quality conpensation method KR0132874B1 (en)

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KR1019930017545A KR0132874B1 (en) 1993-08-31 1993-08-31 Image amplification circuit and picture quality conpensation method

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KR0132874B1 KR0132874B1 (en) 1998-04-16

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100536397B1 (en) * 1999-06-28 2005-12-12 매그나칩 반도체 유한회사 Apparatus for improving contrast and dynamic range of image
KR100639155B1 (en) * 1997-06-02 2006-10-27 사르노프 코포레이션 Extended dynamic range imaging system and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100639155B1 (en) * 1997-06-02 2006-10-27 사르노프 코포레이션 Extended dynamic range imaging system and method
KR100536397B1 (en) * 1999-06-28 2005-12-12 매그나칩 반도체 유한회사 Apparatus for improving contrast and dynamic range of image

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