JPS564993A - White balance regulator of color video camera - Google Patents

White balance regulator of color video camera

Info

Publication number
JPS564993A
JPS564993A JP7918379A JP7918379A JPS564993A JP S564993 A JPS564993 A JP S564993A JP 7918379 A JP7918379 A JP 7918379A JP 7918379 A JP7918379 A JP 7918379A JP S564993 A JPS564993 A JP S564993A
Authority
JP
Japan
Prior art keywords
color temperature
signal
time
color
video camera
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
JP7918379A
Other languages
Japanese (ja)
Other versions
JPS6142993B2 (en
Inventor
Kentaro Hanma
Michio Ogimoto
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 JP7918379A priority Critical patent/JPS564993A/en
Publication of JPS564993A publication Critical patent/JPS564993A/en
Publication of JPS6142993B2 publication Critical patent/JPS6142993B2/ja
Granted 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

Abstract

PURPOSE:To attain excellent color reproduction at any time by detecting the color temperature of a light source all the time and by automatically making corresponding white balance regulation. CONSTITUTION:Color video camera 1 is equipped with external photometry circuit 11 and its photodetector 12 consists of element R' responding strongly to short- wavelength light (specially, R component) and element B' responding strongly to long-wavelength light (specially, B component). The outputs of elements R' and B' to which scattering light from milk-white filter 16 is incident are input to logarithmic compressing circuits 131 and 132 and then R/B signal generating circuit 14 obtains the ratio of one signal to the other. Next, its R/B signal is supplied to white balancing circuit 15 to find a color temperature and an output that corresponds to the color temperature is supplied to R signal and B signal amplifying circuits 41 and 43 to change their gains according to the color temperature. Corresponding to the fluctuations of the color temperature, the white balancing circuit operates automatically, so that excellent color reproduction will come into effect at any time.
JP7918379A 1979-06-25 1979-06-25 White balance regulator of color video camera Granted JPS564993A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7918379A JPS564993A (en) 1979-06-25 1979-06-25 White balance regulator of color video camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7918379A JPS564993A (en) 1979-06-25 1979-06-25 White balance regulator of color video camera

Publications (2)

Publication Number Publication Date
JPS564993A true JPS564993A (en) 1981-01-19
JPS6142993B2 JPS6142993B2 (en) 1986-09-25

Family

ID=13682857

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7918379A Granted JPS564993A (en) 1979-06-25 1979-06-25 White balance regulator of color video camera

Country Status (1)

Country Link
JP (1) JPS564993A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4395730A (en) * 1981-05-26 1983-07-26 Shen Chou Ming Automatic color-temperature compensation device
EP0097032A2 (en) * 1982-06-10 1983-12-28 Sony Corporation Electronic cameras
JPS5946075U (en) * 1982-09-16 1984-03-27 日本電気株式会社 Automatic color temperature correction circuit
JPS60191A (en) * 1983-06-15 1985-01-05 Canon Inc Color temperature compensating device of color television camera
JPS60190A (en) * 1983-06-15 1985-01-05 Canon Inc Color temperature compensating device of color television camera
JPS62107593A (en) * 1985-11-05 1987-05-18 Sanyo Electric Co Ltd White balance unadjustment compensation circuit
US4774564A (en) * 1986-09-09 1988-09-27 Fuji Photo Film Co., Ltd. Electronic still camera for compensating color temperature dependency of color video signals
US4899212A (en) * 1987-08-28 1990-02-06 Fuji Photo Film Co., Ltd. White balance adjusting device for a camera
US4931856A (en) * 1983-12-28 1990-06-05 Canon Kabushiki Kaisha Image sensing apparatus

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5092034A (en) * 1973-12-12 1975-07-23
JPS5178925A (en) * 1974-12-30 1976-07-09 Teac Corp Karaasatsuzosochi
JPS51114078U (en) * 1975-03-13 1976-09-16
JPS5341021U (en) * 1976-09-13 1978-04-10
JPS53119623A (en) * 1977-03-29 1978-10-19 Canon Inc Television camera
JPS5643706U (en) * 1979-09-12 1981-04-21
JPS5760567U (en) * 1980-09-25 1982-04-09

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5092034A (en) * 1973-12-12 1975-07-23
JPS5178925A (en) * 1974-12-30 1976-07-09 Teac Corp Karaasatsuzosochi
JPS51114078U (en) * 1975-03-13 1976-09-16
JPS5341021U (en) * 1976-09-13 1978-04-10
JPS53119623A (en) * 1977-03-29 1978-10-19 Canon Inc Television camera
JPS5643706U (en) * 1979-09-12 1981-04-21
JPS5760567U (en) * 1980-09-25 1982-04-09

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4395730A (en) * 1981-05-26 1983-07-26 Shen Chou Ming Automatic color-temperature compensation device
EP0097032A2 (en) * 1982-06-10 1983-12-28 Sony Corporation Electronic cameras
JPS6320227Y2 (en) * 1982-09-16 1988-06-06
JPS5946075U (en) * 1982-09-16 1984-03-27 日本電気株式会社 Automatic color temperature correction circuit
JPS60191A (en) * 1983-06-15 1985-01-05 Canon Inc Color temperature compensating device of color television camera
JPS60190A (en) * 1983-06-15 1985-01-05 Canon Inc Color temperature compensating device of color television camera
JPH0560314B2 (en) * 1983-06-15 1993-09-02 Canon Kk
JPH0657067B2 (en) * 1983-06-15 1994-07-27 キヤノン株式会社 Color temperature compensation device for color television cameras
US4931856A (en) * 1983-12-28 1990-06-05 Canon Kabushiki Kaisha Image sensing apparatus
JPS62107593A (en) * 1985-11-05 1987-05-18 Sanyo Electric Co Ltd White balance unadjustment compensation circuit
US4774564A (en) * 1986-09-09 1988-09-27 Fuji Photo Film Co., Ltd. Electronic still camera for compensating color temperature dependency of color video signals
US4899212A (en) * 1987-08-28 1990-02-06 Fuji Photo Film Co., Ltd. White balance adjusting device for a camera
USRE39410E1 (en) * 1987-08-28 2006-11-28 Fuji Photo Film Co., Ltd. White balance adjusting device for a camera

Also Published As

Publication number Publication date
JPS6142993B2 (en) 1986-09-25

Similar Documents

Publication Publication Date Title
DE3380438D1 (en) Electronic cameras
EP0400606A3 (en) Automatic white balance control circuit
JPS564993A (en) White balance regulator of color video camera
JPH0758226B2 (en) Light source detection device
JPS56169986A (en) Automatic white color adjusting circuit in television camera
JPS56155820A (en) Photometric arithmetic system
KR880004686A (en) Luminance signal forming circuit
JPS56119820A (en) Photometric system
JPS5781775A (en) Image pickup equipment
JPS5528627A (en) Automatic white balance system in color pick up unit
JPS5737992A (en) Automatic white-balance regulating circuit of color video camera
US4590512A (en) Circuit for detecting the ratio of intensities of the color components of light
JPS5685989A (en) Automatic color balance adjusting circuit
JPS55127528A (en) Program control camera
JPS5744385A (en) Signal processing circuit of color video camera
JPS56132078A (en) Video signal processing circuit
JPS5552034A (en) Aperture control system for camera
SU1357727A1 (en) Device for measuring spectral brightness coefficient of diffusively reflecting surfaces
JPS5726828A (en) Television camera
JPS5726978A (en) Color image sensing device
JPS61184990A (en) Color video camera
JPS56128041A (en) Light wave-length multiple signal transmission equipment
JPS5636291A (en) Automatic white adjusting circuit in television camera
JPS55103530A (en) Exposure time control circuit of camera
JPS57157224A (en) Display device for focusing of camera