JPS57174986A - Aperture correcting circuit of video camera - Google Patents

Aperture correcting circuit of video camera

Info

Publication number
JPS57174986A
JPS57174986A JP56060401A JP6040181A JPS57174986A JP S57174986 A JPS57174986 A JP S57174986A JP 56060401 A JP56060401 A JP 56060401A JP 6040181 A JP6040181 A JP 6040181A JP S57174986 A JPS57174986 A JP S57174986A
Authority
JP
Japan
Prior art keywords
signal
zoom lens
aperture correction
aperture
zoom magnification
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
JP56060401A
Other languages
Japanese (ja)
Inventor
Kunihiko Yamakawa
Yoshinori Kitamura
Teruo Saito
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 JP56060401A priority Critical patent/JPS57174986A/en
Publication of JPS57174986A publication Critical patent/JPS57174986A/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
    • H04N23/40—Circuit details for pick-up tubes

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)

Abstract

PURPOSE:To improve the picture quality of an image by automatically performing aperture correction according to zoom magnification of a zoom lens by detecting the zoom magnification, and then performing the aperture correction according to the detected value. CONSTITUTION:A TV camera mounting a zoom lens 7 is provided, and the zoom magnification of this zoom lens 7 is detected by a voltage detection part 8 in the form of a voltage value to send an aperture correction signal to an amplifier 9. a video signal from a signal source 1 is matched with a delay circuit 3 through a characteristic impedance element 2, and a signal delayed by the delay circuit 3 and the undelayed signal are supplied to a subtracter 4, which detects the edge component of the video signal. The edge component detected by the subtracter 4 is applied to an amplifier 9, whose gain is varied by the aperture correction signal generated by the detection part 8, thus controlling the amplitude of the edge component. Then, an aperture is corrected automatically according to the zoom magnification of the zoom lens 7 to improve the picture quality of the image signal.
JP56060401A 1981-04-20 1981-04-20 Aperture correcting circuit of video camera Pending JPS57174986A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56060401A JPS57174986A (en) 1981-04-20 1981-04-20 Aperture correcting circuit of video camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56060401A JPS57174986A (en) 1981-04-20 1981-04-20 Aperture correcting circuit of video camera

Publications (1)

Publication Number Publication Date
JPS57174986A true JPS57174986A (en) 1982-10-27

Family

ID=13141100

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56060401A Pending JPS57174986A (en) 1981-04-20 1981-04-20 Aperture correcting circuit of video camera

Country Status (1)

Country Link
JP (1) JPS57174986A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02131679A (en) * 1988-11-11 1990-05-21 Matsushita Electric Ind Co Ltd Electronic zoom device and image pickup device incorporating electronic zoom
JPH06153050A (en) * 1992-11-09 1994-05-31 Akai Electric Co Ltd Video camera
US7468749B2 (en) 2003-03-19 2008-12-23 Sony Corporation Image taking apparatus, and a method of controlling an edge enhancing level of an original image signal

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02131679A (en) * 1988-11-11 1990-05-21 Matsushita Electric Ind Co Ltd Electronic zoom device and image pickup device incorporating electronic zoom
JPH0691631B2 (en) * 1988-11-11 1994-11-14 松下電器産業株式会社 Electronic zoom device and imaging device with built-in electronic zoom
JPH06153050A (en) * 1992-11-09 1994-05-31 Akai Electric Co Ltd Video camera
US7468749B2 (en) 2003-03-19 2008-12-23 Sony Corporation Image taking apparatus, and a method of controlling an edge enhancing level of an original image signal

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