JPS5658375A - Automatic focussing device for video camera - Google Patents

Automatic focussing device for video camera

Info

Publication number
JPS5658375A
JPS5658375A JP13418179A JP13418179A JPS5658375A JP S5658375 A JPS5658375 A JP S5658375A JP 13418179 A JP13418179 A JP 13418179A JP 13418179 A JP13418179 A JP 13418179A JP S5658375 A JPS5658375 A JP S5658375A
Authority
JP
Japan
Prior art keywords
picked
voltage
pulses
line components
picture
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
JP13418179A
Other languages
Japanese (ja)
Inventor
Kentaro Hanma
Michio Masuda
Kaoru Yanagawa
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 JP13418179A priority Critical patent/JPS5658375A/en
Publication of JPS5658375A publication Critical patent/JPS5658375A/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
    • H04N23/60—Control of cameras or camera modules
    • H04N23/67—Focus control based on electronic image sensor signals
    • H04N23/673—Focus control based on electronic image sensor signals based on contrast or high frequency components of image signals, e.g. hill climbing method

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Automatic Focus Adjustment (AREA)
  • Focusing (AREA)

Abstract

PURPOSE:To enable to perform automatic focussing in excellent way independently of the number of longitudinal line components in a picture, by changing the sensitivity of a detector with the number of longitudinal line components having greater difference of contrast included in picked up picture. CONSTITUTION:High band components only are picked up at a high pass filter 4 from a video signal being an electric signal at a camera circuit 2 incident to a lens 1. Positive/negative pulses among the outputs are converted into positive pulses at a full wave rectifying circuit 10, the number of pulses, i.e., number of longitudinal lines is counted at a counter 12, the result is converted into a DC voltage at a D/A converter 13, and this is fed to a control terminal of a variable gain control amplifier 14. Since the gain of the variable gain control amplifier 14 is small when the control voltage is high, a detector 5 is not saturated even if pictures having many longitudianal line components are picked up. Further, focussing is matched by moving the helicoid position of the lens 1 with a motor 8 so that the voltage across a terminal 51 is maximum.
JP13418179A 1979-10-19 1979-10-19 Automatic focussing device for video camera Pending JPS5658375A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13418179A JPS5658375A (en) 1979-10-19 1979-10-19 Automatic focussing device for video camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13418179A JPS5658375A (en) 1979-10-19 1979-10-19 Automatic focussing device for video camera

Publications (1)

Publication Number Publication Date
JPS5658375A true JPS5658375A (en) 1981-05-21

Family

ID=15122327

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13418179A Pending JPS5658375A (en) 1979-10-19 1979-10-19 Automatic focussing device for video camera

Country Status (1)

Country Link
JP (1) JPS5658375A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3223879A1 (en) 1981-06-26 1983-01-13 Hitachi, Ltd., Tokyo METHOD AND DEVICE FOR AUTOMATICALLY FOCUSING A VIDEO CAMERA
JPS5813075A (en) * 1981-07-16 1983-01-25 Fuji Photo Film Co Ltd Automatic focus adjuster for video camera
JPS5858506A (en) * 1981-10-05 1983-04-07 Hitachi Ltd Double wave detecting circuit for auto-focusing device
JPS60142678A (en) * 1983-12-28 1985-07-27 Matsushita Electric Ind Co Ltd automatic focusing device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3223879A1 (en) 1981-06-26 1983-01-13 Hitachi, Ltd., Tokyo METHOD AND DEVICE FOR AUTOMATICALLY FOCUSING A VIDEO CAMERA
JPS5813075A (en) * 1981-07-16 1983-01-25 Fuji Photo Film Co Ltd Automatic focus adjuster for video camera
JPS5858506A (en) * 1981-10-05 1983-04-07 Hitachi Ltd Double wave detecting circuit for auto-focusing device
JPS60142678A (en) * 1983-12-28 1985-07-27 Matsushita Electric Ind Co Ltd automatic focusing device

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