JPS56164693A - Automatic white balance system - Google Patents

Automatic white balance system

Info

Publication number
JPS56164693A
JPS56164693A JP6741280A JP6741280A JPS56164693A JP S56164693 A JPS56164693 A JP S56164693A JP 6741280 A JP6741280 A JP 6741280A JP 6741280 A JP6741280 A JP 6741280A JP S56164693 A JPS56164693 A JP S56164693A
Authority
JP
Japan
Prior art keywords
output
chroma signal
signal
fed
color encoder
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
JP6741280A
Other languages
Japanese (ja)
Inventor
Kenji Kimura
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.)
Olympus Corp
Original Assignee
Olympus Optical 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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP6741280A priority Critical patent/JPS56164693A/en
Publication of JPS56164693A publication Critical patent/JPS56164693A/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 make correction of carrier balance due to temperature drift of an orthogonal modulator, by detecting the chroma signal at white balance operation from the output of the orthogonal modulator of an color encoder modulated with the chroma signal information. CONSTITUTION:A photoelectric converting output converted at a target 3 of a image tube 1 is fed to an LPF5, BPFs 6 and 7 and a Y signal from the LPF5 is inputted to a YC mixer 8. Further, a chroma signal information detected from the BPFs 6, 7 is detected for the modulating component of carrier with detection circuits 9, 10 and the chroma signal is red and blue can be detected with LPFs 11, 12. Further, after DC biasing, the difference between the output and the Y signal is given to a color encoder 17. Further, the chroma signal is outputted and fed to another input to the YC mixer 8 and outputted from a color video signal output 18. On the other hand, the output of the color encoder 17 is fed to sampling hold circuits 21, 22 to be a bias voltage to DC bias circuits 15, 16 to avoid the production of chroma signal at the output of the color encoder 17.
JP6741280A 1980-05-21 1980-05-21 Automatic white balance system Pending JPS56164693A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6741280A JPS56164693A (en) 1980-05-21 1980-05-21 Automatic white balance system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6741280A JPS56164693A (en) 1980-05-21 1980-05-21 Automatic white balance system

Publications (1)

Publication Number Publication Date
JPS56164693A true JPS56164693A (en) 1981-12-17

Family

ID=13344166

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6741280A Pending JPS56164693A (en) 1980-05-21 1980-05-21 Automatic white balance system

Country Status (1)

Country Link
JP (1) JPS56164693A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50115724A (en) * 1974-02-21 1975-09-10
JPS54118132A (en) * 1978-03-07 1979-09-13 Sony Corp White balance adjusting circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50115724A (en) * 1974-02-21 1975-09-10
JPS54118132A (en) * 1978-03-07 1979-09-13 Sony Corp White balance adjusting circuit

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