KR970078518A - Back level correction device for luminance signal - Google Patents

Back level correction device for luminance signal Download PDF

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Publication number
KR970078518A
KR970078518A KR1019960018588A KR19960018588A KR970078518A KR 970078518 A KR970078518 A KR 970078518A KR 1019960018588 A KR1019960018588 A KR 1019960018588A KR 19960018588 A KR19960018588 A KR 19960018588A KR 970078518 A KR970078518 A KR 970078518A
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KR
South Korea
Prior art keywords
luminance signal
value
level
signal
back level
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KR1019960018588A
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Korean (ko)
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KR100186713B1 (en
Inventor
조민수
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배순훈
대우전자 주식회사
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Priority to KR1019960018588A priority Critical patent/KR100186713B1/en
Publication of KR970078518A publication Critical patent/KR970078518A/en
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Publication of KR100186713B1 publication Critical patent/KR100186713B1/en

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    • 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
    • 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
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/08—Separation of synchronising signals from picture signals
    • 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
    • H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
    • H04N5/18—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit

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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)
  • Processing Of Color Television Signals (AREA)

Abstract

본 발명은 휘도신호의 백레벨 보정장치에 관한 것으로, 종래에는 방송국에서 송출되는 방송신호의 영상이나 외부에서 입력되는 외부 입력신호의 영상을 음극선관에 디스플레이하는 중에 음극선관에 디스플레이되는 영상의 배경이 어두우면 배경과 함께 디스플레이되는 물체의 영상이 선명하게 디스플레이되지 않아 배경과 물체를 구분하지 못한다. 본 발명은 방송국에서 수신되는 영상신호의 휘도신호나 외부에서 입력되는 영상신호의 휘도 신호 중 중간 레벨값 이상(백레벨)로 입력되는 휘도신호에 대하여 기준 최대값과 입력되는 휘도신호의 최대값의 보정값을 가산하여 휘도신호의 백레벨을 보정함으로써, 음극선관에 디스플레이되는 영상 중 배경과 물체를 보다 선명하게 구분할 수 있는 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for correcting a back level of a luminance signal. In the related art, a background of an image displayed on a cathode ray tube is displayed while displaying an image of a broadcast signal transmitted from a broadcasting station or an image of an external input signal input from the outside. If it is dark, the image of the object displayed with the background is not displayed clearly, so that the background and the object cannot be distinguished. According to the present invention, a reference maximum value and a maximum value of a luminance signal input to a luminance signal input at a middle level value or more (back level) of a luminance signal of a video signal received from a broadcasting station or a luminance signal of an externally input video signal are determined. By correcting the back level of the luminance signal by adding the correction value, the background and the object of the image displayed on the cathode ray tube can be distinguished more clearly.

Description

휘도신호의 백레벨 보정장치Back level correction device for luminance signal

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

제1도는 본 발명의 일실시예에 따른 회로도. 제2도는 본 발명의 일실시예에 따른 타이밍도.1 is a circuit diagram according to an embodiment of the present invention. 2 is a timing diagram according to an embodiment of the present invention.

Claims (3)

입력 휘도신호(Y)가 일정레벨을 유지하도록 클램핑하여 이를 디지탈신호로 변환하는 클램프 및 아날로그/디지탈 변환부를 포함하는 휘도신호 레벨 조절장치에 있어서, 상기 클램프 및 아날로그/디지탈 변환부에서 출력되는 휘도신호(Y)의 최대값을 검출하는 최대값 검출부; 상기 최대값 검출부에서 검출되는 최대값 휘도신호의 기준 최대값을 대비하여 보정값을 연산하는 보정값 연산부; 상기 클램프 및 아날로그/디지탈 변환부에서 출력되는 휘도신호 중 1H의 휘도신호를 메모리하는 1H메모리부; 상기 1H 메모리부에서 메모리되는 휘도신호 중 백레벨의 휘도신호만을 검파하는 백레벨 검파부; 상기 백레벨 검파부에서 검파되는 휘도신호에 상기 보정값 연산부에서 출력되는 보정값을 가산하는 백레벨 보정부; 상기 백레벨 보정부에서 출력되는 휘도신호 중 기준 최대값 이상의 휘도신호를 클리핑하는 클리퍼; 상기 1H 메모리부에서 출력되는 휘도신호의 값과 기준 중간레벨값을 대비하여 로우/ 하이레벨의 스위칭신호를 출력하는 비교부; 상기 비교부에서 출력되는 스위칭신호에 의해 온/오프동작하여 클리퍼의 출력과 라인 지연부의 출력을 선택하는 스위칭IC를 포함하여 구성되어짐을 특징으로 하는 휘도신호의 백레벨 보정장치.A luminance signal level control device comprising a clamp and an analog / digital converter for clamping an input luminance signal (Y) to maintain a constant level and converting it into a digital signal, the luminance signal output from the clamp and the analog / digital converter. A maximum value detector for detecting a maximum value of (Y); A correction value calculator for calculating a correction value against a reference maximum value of the maximum luminance signal detected by the maximum value detector; A 1H memory unit which stores a 1H luminance signal among the luminance signals outputted from the clamp and the analog / digital converter; A back level detector which detects only a luminance signal of a back level among the luminance signals stored in the 1H memory unit; A back level correction unit which adds a correction value output from the correction value calculating unit to the luminance signal detected by the back level detector; A clipper for clipping a luminance signal equal to or greater than a reference maximum value among luminance signals outputted from the back level correction unit; A comparator for outputting a low / high level switching signal by comparing a luminance signal value output from the 1H memory unit with a reference intermediate level value; And a switching IC configured to select an output of the clipper and an output of the line delay unit by an on / off operation by the switching signal output from the comparing unit. 제1항에 있어서, 상기 비교부는 입력되는 휘도신호의 값이 기준 중간레벨값에 비해 작으면 하이레벨의 스위칭신호를 출력하고 입력되는 휘도신호의 값이 기준 중간레벨값에 비해 크면 로우레벨의 스위칭 신호를 출력하도록 구성되어짐을 특징으로 하는 휘도신호의 백레벨 보정장치.The low level switching device of claim 1, wherein the comparison unit outputs a high level switching signal when a value of the input luminance signal is smaller than a reference intermediate level value, and switches a low level when the value of the input luminance signal is larger than a reference intermediate level value. And a back level correction device for a luminance signal, characterized in that it is configured to output a signal. 제1항에 있어서, 상기 1H 메모리부에서 인가되는 휘도신호는 백레벨 검파부와 라인 지연부에서 동일 시간씩 지연되어짐을 특징으로 하는 휘도신호의 백레벨 보정장치.The apparatus of claim 1, wherein the luminance signal applied from the 1H memory unit is delayed by the same time in the back level detector and the line delay unit. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019960018588A 1996-05-29 1996-05-29 Device for compensating white level of luminance signal KR100186713B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019960018588A KR100186713B1 (en) 1996-05-29 1996-05-29 Device for compensating white level of luminance signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019960018588A KR100186713B1 (en) 1996-05-29 1996-05-29 Device for compensating white level of luminance signal

Publications (2)

Publication Number Publication Date
KR970078518A true KR970078518A (en) 1997-12-12
KR100186713B1 KR100186713B1 (en) 1999-05-01

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