KR970009224A - Adaptive Gamma Correction Circuit with Backlight Compensation - Google Patents

Adaptive Gamma Correction Circuit with Backlight Compensation Download PDF

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Publication number
KR970009224A
KR970009224A KR1019950021932A KR19950021932A KR970009224A KR 970009224 A KR970009224 A KR 970009224A KR 1019950021932 A KR1019950021932 A KR 1019950021932A KR 19950021932 A KR19950021932 A KR 19950021932A KR 970009224 A KR970009224 A KR 970009224A
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KR
South Korea
Prior art keywords
gamma
screen
characteristic
correction circuit
backlight compensation
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KR1019950021932A
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Korean (ko)
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KR0178733B1 (en
Inventor
황덕원
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김광호
삼성전자 주식회사
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Priority to KR1019950021932A priority Critical patent/KR0178733B1/en
Publication of KR970009224A publication Critical patent/KR970009224A/en
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Publication of KR0178733B1 publication Critical patent/KR0178733B1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/80—Camera processing pipelines; Components thereof
    • H04N23/82—Camera processing pipelines; Components thereof for controlling camera response irrespective of the scene brightness, e.g. gamma correction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H04N23/76—Circuitry for compensating brightness variation in the scene by influencing the image signals

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Studio Devices (AREA)

Abstract

본 발명은 역광보정기능을 구비한 적응형 감마보정회로에 관한 것이다. 본 발명의 감마보정회로는 동기신호 발생부와, 발생된 동기신호를 기준으로 입력영상신호의 한 화면특징을 입력레벨의 크기에 따라 고ㆍ중ㆍ저의 세단계로 나누에 계수하여 분석하는 화면분석부와, 화면특징에 따른 감마특성들을 테이블로 구비하고, 역광보정스위치가 구동시에는 분석결과에 따라 감마특성을 선택하여 출력하고, 역광보정스위치가 구동하지 않고 감마보정스위치가 구동시에는 사용자에 의해 임의적인 감마특성을 선택하여 출력하는 감마선택부와, 선택된 감마특성과 입력영상신호를 어드레스로 하여 다양한 특성곡선들을 테이블로 구비하며, 입력어드레스가 지정하는 위치의 특성곡선에 따라 역광 및 감마 보정된 영상신호를 출력하는 특성보정부로 구성된다. 따라서, 본 발명은 조리개를 이용하여 역광보정하지 않고 화면특성을 고려하여 감마특성을 설정하여 감마보정하므로 역광보정이 아울러 수행될 수 있어 화면이 포화되지 않고 효율적으로 역광보정이 이루어질 수 있는 효과를 제공한다.The present invention relates to an adaptive gamma correction circuit having a backlight compensation function. In the gamma correction circuit of the present invention, screen analysis is performed by counting and analyzing one screen feature of an input video signal into three stages of high, middle, and low according to the magnitude of the input level based on the generated synchronization signal. Gamma characteristics according to the screen and screen characteristics are provided as a table, and when the backlight compensation switch is driven, the gamma characteristics are selected and output according to the analysis result, and the backlight compensation switch is not driven, but the gamma compensation switch is driven to the user A gamma selection unit for selecting and outputting an arbitrary gamma characteristic, and a variety of characteristic curves as a table based on the selected gamma characteristic and the input image signal, and correcting backlight and gamma according to the characteristic curve of the position designated by the input address. Characteristic correction unit for outputting the video signal. Therefore, the present invention does not perform backlight compensation using the aperture, but gamma correction by setting the gamma characteristics in consideration of the screen characteristics, so that the backlight compensation can be performed as well, so that the screen is not saturated and the backlight compensation can be efficiently performed. do.

Description

역광보정기능을 구비한 적응형 감마보정회로Adaptive Gamma Correction Circuit with Backlight Compensation

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

제2도는 본 발명의 바람직한 실시예에 따른 역광보정기능을 구비한 적응형 감마보정회로를 나타내는 구성도, 제3도는 입력영상신호의 화면특징에 대응하는 감마특성을 얻기 위한 테이블, 제4도는 입력영상신호의 레벨과 감마특성에 대응하는 역광보정 및 감마보정된 데이타를 얻기 위한 특성곡선.2 is a block diagram showing an adaptive gamma correction circuit having a backlight compensation function according to a preferred embodiment of the present invention. FIG. 3 is a table for obtaining a gamma characteristic corresponding to screen characteristics of an input image signal, and FIG. Characteristic curves for obtaining backlight and gamma-corrected data corresponding to video signal levels and gamma characteristics.

Claims (5)

카메라에서 촬영된 입력영상신호의 감마특성을 보정하는 감마보정회로에 있어서, 동기신호를 발생하기 위한 동기신호발생부; 상기 동기신호발생부에서 발생된 동기신호를 기준으로 입력영상신호의 한 화면단위의 특징을 분석하고, 그 분석결과신호를 출력하는 화면분석부; 감마특성을 이용하여 역광촬영시 입력영상신호의 보정을 지정하기 위한 역광보정스위치; 상기 역광보정스위치가 구동되면 상기 화면분석부의 분석결과신호에 따라 화면특징에 따른 다수의 감마특성들 중 하나의 감마특성을 선택하여 출력하는 감마선택부; 및 다수의 특성곡선을 테이블로 구비하며, 상기 감마선택부에서 선택된 감마특성에 의해 특성곡선을 결정하고, 결정된 특성곡선에 따라 입력영상신호에 대한 보정된 영상신호를 출력하는 특성보정부를 포함하는 역광보정기능을 구비한 적응형 감마보정회로.A gamma correction circuit for correcting gamma characteristics of an input image signal photographed by a camera, comprising: a synchronization signal generator for generating a synchronization signal; A screen analyzer which analyzes a feature of one screen unit of an input video signal based on the sync signal generated by the sync signal generator, and outputs an analysis result signal; A backlight compensation switch for designating a correction of an input image signal during backlighting using a gamma characteristic; A gamma selection unit which selects and outputs one of a plurality of gamma characteristics according to screen characteristics according to an analysis result signal of the screen analyzer when the backlight compensation switch is driven; And a plurality of characteristic curves as a table, the characteristic correction unit configured to determine a characteristic curve based on the gamma characteristic selected by the gamma selection unit, and output a corrected image signal for the input image signal according to the determined characteristic curve. Adaptive gamma correction circuit with correction function. 제1항에 있어서, 상기 화면분석부는 입력영상신호의 레벨을 크기에 따라 다수의 단계로 나누어 계수하고, 그 계수값에 의해 화면의 특징을 분석하는 것을 특징으로 하는 역광보정기능을 구비한 적응형 감마보정회로.The adaptive display device according to claim 1, wherein the screen analyzer divides the level of the input video signal into a plurality of stages according to the magnitude, and analyzes the characteristics of the screen based on the count value. Gamma correction circuit. 제1항에 있어서, 상기 감마선택부는 상기 역광보정스위치가 구동되지 않으면 임의의 감마특성을 선택하여 출력하는 것을 특징으로 하는 역광보정기능을 구비한 적응형 감마보정회로.2. The adaptive gamma correction circuit of claim 1, wherein the gamma selection unit selects and outputs an arbitrary gamma characteristic when the backlight compensation switch is not driven. 제1항 또는 제3항에 있어서, 상기 특성보정부는 입력영상신호의 레벨과 상기 감마선택부에서 선택된 감마특성을 어드레스로 입력받고, 그 어드레스가 지시하는 위치에 저장되어 있는 데이타를 역광 및 감마보정된 영상신호로 출력하는 것을 특징으로 하는 역광보정기능을 구비한 적응형 감마보정회로.4. The method of claim 1 or 3, wherein the characteristic correction unit receives an input of a level of an input video signal and a gamma characteristic selected by the gamma selection unit as an address, and back light and gamma correction of data stored at a location indicated by the address. Adaptive gamma correction circuit having a backlight compensation function characterized in that the output as a video signal. 제4항에 있어서, 상기 감마선택부는 상기 화면분석부의 한 화면분석결과 입력영상신호과 고레벨과 저레벨 상태로 분포되는 역광상태이면 상기 특성보정부에서 입력영상신호의 저레벨부분은 증폭되고 고레벨부분은 압축되는 보정된 영상신호가 출력되도록 감마특성을 선택하는 것을 특징으로 하는 역광보정기능을 구비한 적응형 감마보정회로.5. The method of claim 4, wherein the gamma selection unit is a backlight analysis state in which the input image signal and the high level and low level are distributed as a result of one screen analysis of the screen analysis unit. An adaptive gamma correction circuit having a backlight correction function, characterized in that the gamma characteristic is selected so that a corrected video signal is output. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950021932A 1995-07-24 1995-07-24 Adaptive gamma correcting circuit with the function of back light correction KR0178733B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR980002050A (en) * 1996-06-05 1998-03-30 에. 알테르, 하. 페. 비틀린 Process for preparing diketopyrrolopyrrole derivatives

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100480560B1 (en) * 1997-08-13 2005-07-07 삼성전자주식회사 Backlight correction method and device for image
KR101532090B1 (en) * 2008-11-11 2015-06-26 엘지이노텍 주식회사 Method and apparatus for video process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR980002050A (en) * 1996-06-05 1998-03-30 에. 알테르, 하. 페. 비틀린 Process for preparing diketopyrrolopyrrole derivatives

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