JPS57183190A - Picture correction system - Google Patents

Picture correction system

Info

Publication number
JPS57183190A
JPS57183190A JP6819081A JP6819081A JPS57183190A JP S57183190 A JPS57183190 A JP S57183190A JP 6819081 A JP6819081 A JP 6819081A JP 6819081 A JP6819081 A JP 6819081A JP S57183190 A JPS57183190 A JP S57183190A
Authority
JP
Japan
Prior art keywords
data
level
coordinates
surrounding
picture element
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
JP6819081A
Other languages
Japanese (ja)
Other versions
JPH0366875B2 (en
Inventor
Mitsuru Rokunohe
Toshiyuki Nakajima
Sadanari Iwata
Hiroyuki Tajima
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.)
DAINICHI NIPPON DENSEN KK
GURAFUIKA KK
Dainichi Nippon Cables Ltd
Original Assignee
DAINICHI NIPPON DENSEN KK
GURAFUIKA KK
Dainichi Nippon Cables 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 DAINICHI NIPPON DENSEN KK, GURAFUIKA KK, Dainichi Nippon Cables Ltd filed Critical DAINICHI NIPPON DENSEN KK
Priority to JP6819081A priority Critical patent/JPS57183190A/en
Publication of JPS57183190A publication Critical patent/JPS57183190A/en
Publication of JPH0366875B2 publication Critical patent/JPH0366875B2/ja
Granted 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 compensate the disconnection defective of an optical fiber by increasing the brightness level of a picture element composed of a black dot or having a low brightness level by using the mean value of brightness levels of picture elements surrounding said picture element if there is such a picture element in a displayed picture. CONSTITUTION:An optical image from an optical fiber cable is digitized by an AD converter 12 according to coordinates from a coordinates generating circuit 11 and then applied to a buffer memory 14. The output of the buffer memory 14 is inputted to a level discriminating circuit 31 after coordinates conversion. The level discriminating circuit 31 writes the input data in a refresh memory 16 when it has a prescribed level or transfers the address of the data to a surrounding coordinates generating circuit 32 when the level of the data is lower than the prescribed level. The generating circuit 32 reads data, which correspond to the addresses of the surrounding data of the input data, out of the refresh memory 16, and an arithmetic circuit 35 calculates their mean brightness level, which is written in the refresh memory 16 as the brightness level of this data. Consequently, data absence due to the fiber disconnection of the optical cable can be compensated.
JP6819081A 1981-05-08 1981-05-08 Picture correction system Granted JPS57183190A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6819081A JPS57183190A (en) 1981-05-08 1981-05-08 Picture correction system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6819081A JPS57183190A (en) 1981-05-08 1981-05-08 Picture correction system

Publications (2)

Publication Number Publication Date
JPS57183190A true JPS57183190A (en) 1982-11-11
JPH0366875B2 JPH0366875B2 (en) 1991-10-18

Family

ID=13366611

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6819081A Granted JPS57183190A (en) 1981-05-08 1981-05-08 Picture correction system

Country Status (1)

Country Link
JP (1) JPS57183190A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008100401A (en) * 2006-10-18 2008-05-01 Sakawa:Kk Multipurpose writing board
US8470451B2 (en) 2005-09-02 2013-06-25 Jfe Metal Products & Engineering Inc. Projection blackboard

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5362428A (en) * 1976-11-17 1978-06-03 Nec Corp Control memory unit
JPS5599890A (en) * 1979-01-22 1980-07-30 Furukawa Electric Co Ltd:The Image transmission method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5362428A (en) * 1976-11-17 1978-06-03 Nec Corp Control memory unit
JPS5599890A (en) * 1979-01-22 1980-07-30 Furukawa Electric Co Ltd:The Image transmission method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8470451B2 (en) 2005-09-02 2013-06-25 Jfe Metal Products & Engineering Inc. Projection blackboard
US9168566B2 (en) 2005-09-02 2015-10-27 Jfe Metal Products & Engineering Inc. Process for producing a projection blackboard
JP2008100401A (en) * 2006-10-18 2008-05-01 Sakawa:Kk Multipurpose writing board

Also Published As

Publication number Publication date
JPH0366875B2 (en) 1991-10-18

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