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JPS56104594A - Automatic color balance device - Google Patents

Automatic color balance device

Info

Publication number
JPS56104594A
JPS56104594A JP707580A JP707580A JPS56104594A JP S56104594 A JPS56104594 A JP S56104594A JP 707580 A JP707580 A JP 707580A JP 707580 A JP707580 A JP 707580A JP S56104594 A JPS56104594 A JP S56104594A
Authority
JP
Japan
Prior art keywords
signal
color balance
gate
signals
output
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
JP707580A
Other languages
Japanese (ja)
Other versions
JPS6132875B2 (en
Inventor
Masayoshi Matsuo
Takashi Higuchi
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP707580A priority Critical patent/JPS56104594A/en
Publication of JPS56104594A publication Critical patent/JPS56104594A/en
Publication of JPS6132875B2 publication Critical patent/JPS6132875B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/73—Colour balance circuits, e.g. white balance circuits or colour temperature control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/11—Scanning of colour motion picture films, e.g. for telecine

Landscapes

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

Abstract

PURPOSE:To adjust color balance stably, by controlling automatically the threshold value, which the threshold determining circuit outputs, according to the signal obtained by gating the error signal and by operating and generating a color balance control signal from the error signal. CONSTITUTION:R, G and B signals from input signal terminals 1-3 are compared with the set value from gamma threshold determining circuit 7 by level comparators 4-6, and signals which are a prescribed level or less are detected by AND gate 8. Further, the G signal is input as the reference signal, and outputs of differential amplifiers 9 and 10 which output difference signals between G and R and between G and B are applied to gate circuits 11 and 12, and circuits 11 and 12 are controlled by the output of gate 8; and when the output of gate 8 exists, the difference signals are held in average value holding circuits 13 and 14, and a color balance signal is operated from the error signal by operation control part 15. R and B gamma control signals are output from control part 15, and the color balance signal is applied to circuit, thereby adjusting color balance stably.
JP707580A 1980-01-23 1980-01-23 Automatic color balance device Granted JPS56104594A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP707580A JPS56104594A (en) 1980-01-23 1980-01-23 Automatic color balance device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP707580A JPS56104594A (en) 1980-01-23 1980-01-23 Automatic color balance device

Publications (2)

Publication Number Publication Date
JPS56104594A true JPS56104594A (en) 1981-08-20
JPS6132875B2 JPS6132875B2 (en) 1986-07-30

Family

ID=11655954

Family Applications (1)

Application Number Title Priority Date Filing Date
JP707580A Granted JPS56104594A (en) 1980-01-23 1980-01-23 Automatic color balance device

Country Status (1)

Country Link
JP (1) JPS56104594A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60125094A (en) * 1983-12-09 1985-07-04 Matsushita Electric Ind Co Ltd Color picture reproducing device
JPS60203093A (en) * 1984-03-27 1985-10-14 Olympus Optical Co Ltd White balance circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60125094A (en) * 1983-12-09 1985-07-04 Matsushita Electric Ind Co Ltd Color picture reproducing device
JPS60203093A (en) * 1984-03-27 1985-10-14 Olympus Optical Co Ltd White balance circuit

Also Published As

Publication number Publication date
JPS6132875B2 (en) 1986-07-30

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