JPS56141667A - Video signal processing equipment - Google Patents

Video signal processing equipment

Info

Publication number
JPS56141667A
JPS56141667A JP4593980A JP4593980A JPS56141667A JP S56141667 A JPS56141667 A JP S56141667A JP 4593980 A JP4593980 A JP 4593980A JP 4593980 A JP4593980 A JP 4593980A JP S56141667 A JPS56141667 A JP S56141667A
Authority
JP
Japan
Prior art keywords
pass filter
low
frequency component
video signal
cutting
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
JP4593980A
Other languages
Japanese (ja)
Inventor
Yoshikazu Yokomizo
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 JP4593980A priority Critical patent/JPS56141667A/en
Publication of JPS56141667A publication Critical patent/JPS56141667A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/403—Discrimination between the two tones in the picture signal of a two-tone original

Landscapes

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

Abstract

PURPOSE:To realize a random dazer by a simple method and also remove a large fringe pattern appearing in the main scanning direction of a picture, by making a threshold level of each picture element into the binary code by white noise N. CONSTITUTION:A white noise is generated by the oscillator 1 consisting of a Zener diode, etc., and the overall frequency characteristic is flattened by the equalizer 2. The band pass filter 3 is equipped with a high-pass filter for cutting a low frequency component and also a low-pass filter for cutting a high frequency component. When the low frequency component is removed, it is possible to prevent a variation of density in the main scanning direction, and also when the cut-off frequency of the low-pass filter is set a little lower than the maximum frequency of an input video signal, it is possible to make minimum the generation of interference fringe which occurs in case when frequencies are almost equal.
JP4593980A 1980-04-08 1980-04-08 Video signal processing equipment Pending JPS56141667A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4593980A JPS56141667A (en) 1980-04-08 1980-04-08 Video signal processing equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4593980A JPS56141667A (en) 1980-04-08 1980-04-08 Video signal processing equipment

Publications (1)

Publication Number Publication Date
JPS56141667A true JPS56141667A (en) 1981-11-05

Family

ID=12733237

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4593980A Pending JPS56141667A (en) 1980-04-08 1980-04-08 Video signal processing equipment

Country Status (1)

Country Link
JP (1) JPS56141667A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5006938A (en) * 1989-09-05 1991-04-09 Eastman Kodak Company Half-tone image generator using white noise source
US5083210A (en) * 1990-09-28 1992-01-21 Xerox Corporation Elimination of contouring on displayed gray level images
US5225915A (en) * 1989-06-09 1993-07-06 Xerox Corporation Image processing with noise enhancing operators for moire reduction and/or random dot generation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5225915A (en) * 1989-06-09 1993-07-06 Xerox Corporation Image processing with noise enhancing operators for moire reduction and/or random dot generation
US5006938A (en) * 1989-09-05 1991-04-09 Eastman Kodak Company Half-tone image generator using white noise source
US5083210A (en) * 1990-09-28 1992-01-21 Xerox Corporation Elimination of contouring on displayed gray level images

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