KR950027380A - Backlight Compensation Circuit of Camera - Google Patents

Backlight Compensation Circuit of Camera Download PDF

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Publication number
KR950027380A
KR950027380A KR1019940006899A KR19940006899A KR950027380A KR 950027380 A KR950027380 A KR 950027380A KR 1019940006899 A KR1019940006899 A KR 1019940006899A KR 19940006899 A KR19940006899 A KR 19940006899A KR 950027380 A KR950027380 A KR 950027380A
Authority
KR
South Korea
Prior art keywords
luminance signal
value
backlight compensation
increasing
input
Prior art date
Application number
KR1019940006899A
Other languages
Korean (ko)
Other versions
KR0139363B1 (en
Inventor
전홍기
Original Assignee
김광호
삼성전자주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 김광호, 삼성전자주식회사 filed Critical 김광호
Priority to KR1019940006899A priority Critical patent/KR0139363B1/en
Publication of KR950027380A publication Critical patent/KR950027380A/en
Application granted granted Critical
Publication of KR0139363B1 publication Critical patent/KR0139363B1/en

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Classifications

    • 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
    • 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
    • H04N23/71—Circuitry for evaluating the brightness variation
    • 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
    • H04N23/75—Circuitry for compensating brightness variation in the scene by influencing optical camera components

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Studio Devices (AREA)
  • Exposure Control For Cameras (AREA)

Abstract

본 발명은 카메라의 역광 보정 회로에 관한 것으로 특히 역광 보정 기능 수행시 조리개가 최대로 열려 휘도신호가 클립되는 것을 방지하고 촬상소자의 화소(Pixel)단위로 휘도신호를 보정하여 완벽한 역광 보정 효과를 얻을 수 있도록 한 것으로써 비데오 카메라에서, 역광 보정 조건시 조리개를 최대로 열기전의 설정값에서 조리개 위치를 결정하는 마이콤을 구비하고 촬상소자에서 촬상된 휘도신호를 전체휘도신호 평균값과 입력 휘도신호값을 비교하여 화소단위로 증감시켜 디지탈 신호처리부에 인가시키는 휘도신호 증감부를 구비하여 된 것이다.The present invention relates to a backlight compensation circuit of a camera. In particular, when the backlight compensation function is performed, the aperture is opened to the maximum to prevent the luminance signal from being clipped, and the luminance signal is corrected in pixel units of the image pickup device to obtain a perfect backlight compensation effect. In the video camera, a microcomputer is configured to determine the aperture position from the set value before opening the aperture to the maximum under the backlight compensation condition, and the luminance signal captured by the image pickup device is compared with the average luminance signal value and the input luminance signal value. And a luminance signal increasing / decreasing unit for increasing or decreasing the pixel unit to be applied to the digital signal processing unit.

Description

카메라의 역광 보정회로Backlight Compensation Circuit of Camera

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

제1도는 종래의 회로도.1 is a conventional circuit diagram.

제2도는 디지탈 신호처리부의 내부회로도.2 is an internal circuit diagram of a digital signal processor.

제3도는 (가)는 화면 분할도,3 is a screen division diagram,

(나)는 촬영 화면의 일실시예.(B) is an embodiment of a shooting screen.

제4도는 조리개 콘트롤 회로도.4 is an aperture control circuit diagram.

Claims (2)

비데오 카메라에서, 역광 보정 조건시 조리개를 최대로 열기전의 설정값에서 조리개 위치를 결정하는 마이콤을 구비하고 촤상소자에서 촤상된 휘도신호를 전체 휘도신호 평균값과 입력 휘도신호값을 비교하여 화소단위로 증감시켜 디지탈신호 처리부에 인가시키는 휘도신호 증감부를 구비하여 된 것을 특징으로 하는 카메라의 역광 보정회로.In a video camera, it is equipped with a microcomputer to determine the aperture position from the set value before opening the aperture to the maximum under the backlight compensation condition, and the luminance signal improved in the thin-film element is increased and decreased in units of pixels by comparing the average luminance value and the input luminance signal value. And a luminance signal increasing / decreasing portion to be applied to the digital signal processing portion. 제1항에 있어서, 휘도신호 증감부는 휘도신호 입력에서 휘도신호 평균값을 빼는 감산기(91)와, 화면전체의 휘도신호 펑균값에서 입력 휘도신호를 뺀값에 따라 설정된 보정값과 휘도신호 입력을 가산시키는 가산기(92)와, 상기 가산기(92)의 출력과 휘도신호 입력을 감산기(91)의 출력에 따라 스위칭 선택하여 출력시키는 멀티플렉서(93)로 이루어지는 것을 특징으로 하는 카메라의 역광 보정 회로.2. The luminance signal increasing / decreasing unit of claim 1, wherein the luminance signal increasing / decreasing unit adds a subtractor 91 for subtracting the average value of the luminance signal from the luminance signal input, and a correction value and the luminance signal input set according to a value obtained by subtracting the input luminance signal from the luminance signal average value of the entire screen. And an adder (92) and a multiplexer (93) for switching and outputting the output of the adder (92) and the luminance signal input according to the output of the subtractor (91). ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940006899A 1994-03-30 1994-03-30 Back light correction circuit for a camera KR0139363B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019940006899A KR0139363B1 (en) 1994-03-30 1994-03-30 Back light correction circuit for a camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019940006899A KR0139363B1 (en) 1994-03-30 1994-03-30 Back light correction circuit for a camera

Publications (2)

Publication Number Publication Date
KR950027380A true KR950027380A (en) 1995-10-16
KR0139363B1 KR0139363B1 (en) 1998-06-15

Family

ID=19380302

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019940006899A KR0139363B1 (en) 1994-03-30 1994-03-30 Back light correction circuit for a camera

Country Status (1)

Country Link
KR (1) KR0139363B1 (en)

Also Published As

Publication number Publication date
KR0139363B1 (en) 1998-06-15

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