JPS5744388A - White balance adjusting circuit - Google Patents

White balance adjusting circuit

Info

Publication number
JPS5744388A
JPS5744388A JP55118314A JP11831480A JPS5744388A JP S5744388 A JPS5744388 A JP S5744388A JP 55118314 A JP55118314 A JP 55118314A JP 11831480 A JP11831480 A JP 11831480A JP S5744388 A JPS5744388 A JP S5744388A
Authority
JP
Japan
Prior art keywords
meter
channel
signal
gain
white balance
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.)
Pending
Application number
JP55118314A
Other languages
Japanese (ja)
Inventor
Masaru Noda
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP55118314A priority Critical patent/JPS5744388A/en
Publication of JPS5744388A publication Critical patent/JPS5744388A/en
Pending legal-status Critical Current

Links

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
    • H04N23/80—Camera processing pipelines; Components thereof
    • H04N23/84—Camera processing pipelines; Components thereof for processing colour signals
    • H04N23/88—Camera processing pipelines; Components thereof for processing colour signals for colour balance, e.g. white-balance circuits or colour temperature control

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

PURPOSE:To adjust white balance by adjusting the indication of a meter to the zero- point even if color temperature is extremely high, by inducing an effective offset to the meter which indicates the level difference of an R-B signal when gain control range of channels R and B are large. CONSTITUTION:Control voltages for R and B gain control circuits 3a and 3b are obtained from a variable resistor 6 and they are passed through a resistance 7 to give a meter an offset voltage. Consequently, if color temperature is high, the voltage dividing ratio of the variable resistor is lowered to increase the gain of a channel R while decreasing that of a channel B. At the point where the meter indicates a zero point, the gain of the channel B is not lowered more actually when it has no offset, so a signal R is set somewhat lower and a signal B is set somewhat higher.
JP55118314A 1980-08-29 1980-08-29 White balance adjusting circuit Pending JPS5744388A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55118314A JPS5744388A (en) 1980-08-29 1980-08-29 White balance adjusting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55118314A JPS5744388A (en) 1980-08-29 1980-08-29 White balance adjusting circuit

Publications (1)

Publication Number Publication Date
JPS5744388A true JPS5744388A (en) 1982-03-12

Family

ID=14733603

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55118314A Pending JPS5744388A (en) 1980-08-29 1980-08-29 White balance adjusting circuit

Country Status (1)

Country Link
JP (1) JPS5744388A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6271393A (en) * 1985-09-25 1987-04-02 Olympus Optical Co Ltd Auto-white balance circuit
US4736241A (en) * 1985-12-04 1988-04-05 Hitachi, Ltd. White balance adjusting device of color video camera

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6271393A (en) * 1985-09-25 1987-04-02 Olympus Optical Co Ltd Auto-white balance circuit
US4736241A (en) * 1985-12-04 1988-04-05 Hitachi, Ltd. White balance adjusting device of color video camera

Similar Documents

Publication Publication Date Title
EP0808024A3 (en) Electrical load driving device including load current limiting circuitry
JPS5744388A (en) White balance adjusting circuit
JPS53124915A (en) Control circuit
JPS55130208A (en) Adjusting method for op amplifier
JPS57179758A (en) Method and device for measurement of temperature coefficient of resistance
JPS5380944A (en) Semiconductor circuit
JPS52122417A (en) Convergence unit
JPS55154430A (en) Temperature detecting circuit
JPS57132211A (en) Temperature control method for heater
JPS5416743A (en) Display system of induction heating device
JPS52105756A (en) Level adjustment circuit
US2478174A (en) High impedance vacuum tube voltmeter
JPS57117002A (en) Automatic setting circuit
JPS5792906A (en) Compensating circuit for nonlinear distortion
JPS5479084A (en) Production of temperature detection circuit
JPS5726767A (en) Measuring circuit for operation time of electromagnetic relay
JPS5229770A (en) Static capacity level meter
JPS5377449A (en) Compander circuit of singal
SU855415A1 (en) Device for wide-range measuring of pressure
SU754715A1 (en) X-ray generator
JPS5661258A (en) Tension controlling apparatus
JPS5593074A (en) Digtial ic tester
JPS56104594A (en) Automatic color balance device
JPS5583901A (en) Pid automatic control method
JPS5339011A (en) Transmission circuit