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JPS5636292A - Automatic white adjusting circuit in television camera - Google Patents

Automatic white adjusting circuit in television camera

Info

Publication number
JPS5636292A
JPS5636292A JP11141579A JP11141579A JPS5636292A JP S5636292 A JPS5636292 A JP S5636292A JP 11141579 A JP11141579 A JP 11141579A JP 11141579 A JP11141579 A JP 11141579A JP S5636292 A JPS5636292 A JP S5636292A
Authority
JP
Japan
Prior art keywords
signal
average level
comparing circuits
averaged
voltages
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
JP11141579A
Other languages
Japanese (ja)
Other versions
JPS605113B2 (en
Inventor
Toyotaka Machida
Yuichi Ikemura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Victor Company of Japan Ltd
Original Assignee
Victor Company of Japan Ltd
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 Victor Company of Japan Ltd filed Critical Victor Company of Japan Ltd
Priority to JP54111415A priority Critical patent/JPS605113B2/en
Priority to GB8027879A priority patent/GB2061661B/en
Priority to DE3032634A priority patent/DE3032634C2/en
Priority to FR8018798A priority patent/FR2464611B1/en
Priority to US06/183,392 priority patent/US4368482A/en
Publication of JPS5636292A publication Critical patent/JPS5636292A/en
Publication of JPS605113B2 publication Critical patent/JPS605113B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/10—Circuitry of solid-state image sensors [SSIS]; Control thereof for transforming different wavelengths into image signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)
  • Analogue/Digital Conversion (AREA)

Abstract

PURPOSE:To make it possible to adjust white automatically, by utilizing facts that the color difference signal becomes zero for picking-up of a white object and primary color signals become equal to one another for it. CONSTITUTION:The G signal from input terminal 111 is applied to the noninversion input terminals of comparing circuits 117 and 118 after averaged by low-pass filter 116. Meanwhile, R and B signals from terminals 3 and 4 are applied to inversion input terminals of comparing circuits 117 and 118 after averaged by low-pass filter 116. The average level of the R signal and the average level of the B signal are compared with the average level of the G signal in comparing circuits 117 and 118, and these difference outputs are counted by reversible counters 50 and 51. Count values are converted to voltages by D/A converters 60 and 61, and the gain of variable gain amplifiers 5 and 6 is controlled by these voltages, thereby equalizing the amplitude of respective primary color signals.
JP54111415A 1979-08-31 1979-08-31 Automatic white adjustment circuit in television camera Expired JPS605113B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP54111415A JPS605113B2 (en) 1979-08-31 1979-08-31 Automatic white adjustment circuit in television camera
GB8027879A GB2061661B (en) 1979-08-31 1980-08-28 Automatic white adjusting circuit for a television camera
DE3032634A DE3032634C2 (en) 1979-08-31 1980-08-29 Automatic white balance switching for a television camera
FR8018798A FR2464611B1 (en) 1979-08-31 1980-08-29 AUTOMATIC WHITE ADJUSTMENT CIRCUIT FOR TELEVISION CAMERAS
US06/183,392 US4368482A (en) 1979-08-31 1980-09-02 Automatic white adjusting circuit for a television camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54111415A JPS605113B2 (en) 1979-08-31 1979-08-31 Automatic white adjustment circuit in television camera

Publications (2)

Publication Number Publication Date
JPS5636292A true JPS5636292A (en) 1981-04-09
JPS605113B2 JPS605113B2 (en) 1985-02-08

Family

ID=14560583

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54111415A Expired JPS605113B2 (en) 1979-08-31 1979-08-31 Automatic white adjustment circuit in television camera

Country Status (1)

Country Link
JP (1) JPS605113B2 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58215890A (en) * 1982-06-09 1983-12-15 Canon Inc automatic white balance system
JPS58215891A (en) * 1982-06-09 1983-12-15 Canon Inc Automatic white balance system
JPS6014580U (en) * 1983-07-06 1985-01-31 日立電子株式会社 tv jiyoung camera
JPS61199390A (en) * 1985-03-01 1986-09-03 Hitachi Ltd white balance device
JPS61292492A (en) * 1985-06-20 1986-12-23 Hitachi Ltd White balance adjusting device
US4646161A (en) * 1984-09-11 1987-02-24 Sony Corporation Automatic white balance control circuit
JPS62154994A (en) * 1985-12-27 1987-07-09 Hitachi Ltd color video camera circuit
JPH02194792A (en) * 1989-01-24 1990-08-01 Sony Corp Auto-white-balance circuit
JPH07255062A (en) * 1994-12-09 1995-10-03 Hitachi Ltd Color video camera
US7184079B2 (en) 2001-05-24 2007-02-27 Nikon Corporation White balance adjustment method, image processing apparatus and electronic camera

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58215890A (en) * 1982-06-09 1983-12-15 Canon Inc automatic white balance system
JPS58215891A (en) * 1982-06-09 1983-12-15 Canon Inc Automatic white balance system
JPS6014580U (en) * 1983-07-06 1985-01-31 日立電子株式会社 tv jiyoung camera
US4646161A (en) * 1984-09-11 1987-02-24 Sony Corporation Automatic white balance control circuit
JPS61199390A (en) * 1985-03-01 1986-09-03 Hitachi Ltd white balance device
JPS61292492A (en) * 1985-06-20 1986-12-23 Hitachi Ltd White balance adjusting device
JPS62154994A (en) * 1985-12-27 1987-07-09 Hitachi Ltd color video camera circuit
JPH02194792A (en) * 1989-01-24 1990-08-01 Sony Corp Auto-white-balance circuit
JPH07255062A (en) * 1994-12-09 1995-10-03 Hitachi Ltd Color video camera
US7184079B2 (en) 2001-05-24 2007-02-27 Nikon Corporation White balance adjustment method, image processing apparatus and electronic camera

Also Published As

Publication number Publication date
JPS605113B2 (en) 1985-02-08

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