JPS56149183A - Video camera - Google Patents

Video camera

Info

Publication number
JPS56149183A
JPS56149183A JP5330080A JP5330080A JPS56149183A JP S56149183 A JPS56149183 A JP S56149183A JP 5330080 A JP5330080 A JP 5330080A JP 5330080 A JP5330080 A JP 5330080A JP S56149183 A JPS56149183 A JP S56149183A
Authority
JP
Japan
Prior art keywords
frequency
frequency divider
flickers
signal
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
JP5330080A
Other languages
Japanese (ja)
Other versions
JPH0243397B2 (en
Inventor
Seiji Hashimoto
Nobuyoshi Tanaka
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP5330080A priority Critical patent/JPS56149183A/en
Publication of JPS56149183A publication Critical patent/JPS56149183A/en
Publication of JPH0243397B2 publication Critical patent/JPH0243397B2/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
    • H04N23/40—Circuit details for pick-up tubes

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)

Abstract

PURPOSE:To reduce flickers by obtaining the same flicker waveform in every cycle by synchronizing the field frequency of TV at cycles (n) types flickers under illumination conditions, and by applying it to an AGC circuit control terminal. CONSTITUTION:When an illumination light source is of 50Hz, photoelectric element 10 detects fluctuations of the quantity of light of 100Hz and through BPF14, only a component of 100Hz is extracted. Output 4b of BPF14 is multiplied by six by PLL circuit 15 and 1/6 frequency divider 16 and frequency-divided by 1/10 frequency divider 17 to 60Hz, but the output of frequency divider 16 is frequency-divided by 1/10 frequency divider 18 as reference frequency division to generate reset pulse 7b' for resetting. Next, 1/3 frequency divider 19 frequency-divides 60Hz signal 8b on the basis of signal 7b'. Then, output signal 9b of frequency divider 19 is a control voltage for AGC circuit 4. This circuit 4 increases the amplification factor as the control voltage rises, reducing flickers greatly.
JP5330080A 1980-04-21 1980-04-21 Video camera Granted JPS56149183A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5330080A JPS56149183A (en) 1980-04-21 1980-04-21 Video camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5330080A JPS56149183A (en) 1980-04-21 1980-04-21 Video camera

Publications (2)

Publication Number Publication Date
JPS56149183A true JPS56149183A (en) 1981-11-18
JPH0243397B2 JPH0243397B2 (en) 1990-09-28

Family

ID=12938867

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5330080A Granted JPS56149183A (en) 1980-04-21 1980-04-21 Video camera

Country Status (1)

Country Link
JP (1) JPS56149183A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60259073A (en) * 1984-06-06 1985-12-21 Hitachi Ltd Quasi-video interframe coding method
JPH01115277A (en) * 1987-10-29 1989-05-08 Hitachi Ltd Solid-state image pickup device
US6882363B1 (en) * 1999-01-29 2005-04-19 Matsushita Electric Industrial Co., Ltd. Video signal processing apparatus

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5052929A (en) * 1973-09-08 1975-05-10
JPS5235527A (en) * 1975-09-16 1977-03-18 Oki Electric Ind Co Ltd Picture signal input device
JPS52122039A (en) * 1976-04-06 1977-10-13 Nippon Telegr & Teleph Corp <Ntt> Flicker noise elimination for television camera
JPS5392682A (en) * 1977-01-25 1978-08-14 Fujitsu Ltd Driving method for semiconductor sensitizing device
JPS54140544A (en) * 1978-04-23 1979-10-31 Canon Inc Exposure control device for zerographic apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5052929A (en) * 1973-09-08 1975-05-10
JPS5235527A (en) * 1975-09-16 1977-03-18 Oki Electric Ind Co Ltd Picture signal input device
JPS52122039A (en) * 1976-04-06 1977-10-13 Nippon Telegr & Teleph Corp <Ntt> Flicker noise elimination for television camera
JPS5392682A (en) * 1977-01-25 1978-08-14 Fujitsu Ltd Driving method for semiconductor sensitizing device
JPS54140544A (en) * 1978-04-23 1979-10-31 Canon Inc Exposure control device for zerographic apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60259073A (en) * 1984-06-06 1985-12-21 Hitachi Ltd Quasi-video interframe coding method
JPH01115277A (en) * 1987-10-29 1989-05-08 Hitachi Ltd Solid-state image pickup device
US6882363B1 (en) * 1999-01-29 2005-04-19 Matsushita Electric Industrial Co., Ltd. Video signal processing apparatus

Also Published As

Publication number Publication date
JPH0243397B2 (en) 1990-09-28

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