JPS56132078A - Video signal processing circuit - Google Patents

Video signal processing circuit

Info

Publication number
JPS56132078A
JPS56132078A JP3546980A JP3546980A JPS56132078A JP S56132078 A JPS56132078 A JP S56132078A JP 3546980 A JP3546980 A JP 3546980A JP 3546980 A JP3546980 A JP 3546980A JP S56132078 A JPS56132078 A JP S56132078A
Authority
JP
Japan
Prior art keywords
circuit
digital
luminance data
luminance
luminance level
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
JP3546980A
Other languages
Japanese (ja)
Inventor
Tsukasa Akaboshi
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP3546980A priority Critical patent/JPS56132078A/en
Publication of JPS56132078A publication Critical patent/JPS56132078A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Closed-Circuit Television Systems (AREA)

Abstract

PURPOSE:To utilize a part of the video signal, which is supplied to the ITV monitor having a high sensing performance, to generate the alarm signal for the abnormal phenomenon, by providing two kinds of reference luminance data setting circuit. CONSTITUTION:Integrating circuit 3 outputs a voltage proportional to the luminance level at the sensing point just before picture switching, and this output is converted to a digital value by analogue-digital converting circuit 4. Digital delay circuit 5 delays luminance data at the sensing point by an arbitrary frame interval, and differential luminance data between the luminance level before (t) seconds and the latest luminance level is obtained by digital difference circuit 6. This differential luminance data is compared with data of two external reference luminance data setting circuits 7 and 8 by digital comparing circuit 9. Consequently, since the output of comparing circuit 9 limits the change the luminance level at the sensing point in detail, a great change of the illumination intensity due to the environmental change other than the abnormal phenomenon in the field is eliminated.
JP3546980A 1980-03-19 1980-03-19 Video signal processing circuit Pending JPS56132078A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3546980A JPS56132078A (en) 1980-03-19 1980-03-19 Video signal processing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3546980A JPS56132078A (en) 1980-03-19 1980-03-19 Video signal processing circuit

Publications (1)

Publication Number Publication Date
JPS56132078A true JPS56132078A (en) 1981-10-16

Family

ID=12442635

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3546980A Pending JPS56132078A (en) 1980-03-19 1980-03-19 Video signal processing circuit

Country Status (1)

Country Link
JP (1) JPS56132078A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63254580A (en) * 1987-04-13 1988-10-21 Canon Inc Image evaluation device
JPS63254579A (en) * 1987-04-13 1988-10-21 Canon Inc Image evaluation device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63254580A (en) * 1987-04-13 1988-10-21 Canon Inc Image evaluation device
JPS63254579A (en) * 1987-04-13 1988-10-21 Canon Inc Image evaluation device
JP2506106B2 (en) * 1987-04-13 1996-06-12 キヤノン株式会社 Image evaluation device

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