JPS56143765A - Processor for video signal - Google Patents

Processor for video signal

Info

Publication number
JPS56143765A
JPS56143765A JP4709880A JP4709880A JPS56143765A JP S56143765 A JPS56143765 A JP S56143765A JP 4709880 A JP4709880 A JP 4709880A JP 4709880 A JP4709880 A JP 4709880A JP S56143765 A JPS56143765 A JP S56143765A
Authority
JP
Japan
Prior art keywords
output
gate
signal
video signal
emphasized
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
JP4709880A
Other languages
Japanese (ja)
Other versions
JPH0131344B2 (en
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 JP4709880A priority Critical patent/JPS56143765A/en
Publication of JPS56143765A publication Critical patent/JPS56143765A/en
Publication of JPH0131344B2 publication Critical patent/JPH0131344B2/ja
Granted 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
    • H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels

Landscapes

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

Abstract

PURPOSE:To reproduce both halftones and thin lines by performing the dither processing of a video signal by a dither processing circuit, by emphasizing the contour of the video signal, and by giving the output of an emphasizing circuit priority to the output of the dither processing circuit. CONSTITUTION:For four mutually adjacent picture elements, comparators 10-13 for quad encoding are given threshold levels from density 1 to density 4 to obtain five gradations. Outputs of those comparators are transmitted to the following stages via latch circuits 24-28. The signal passed through latch circuit 28 is delayed by one picture element each in shift registers 31 and 32 and black-emphasized signal (p) and white-emphasized signal (q) are obtained through inclusive OR gates 33 and 34, AND gates 35-38 and 43, and OR gate 40. Then, OR gate 42 and AND gate 43 output the emphasized signals with priority to a dither output.
JP4709880A 1980-04-10 1980-04-10 Processor for video signal Granted JPS56143765A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4709880A JPS56143765A (en) 1980-04-10 1980-04-10 Processor for video signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4709880A JPS56143765A (en) 1980-04-10 1980-04-10 Processor for video signal

Publications (2)

Publication Number Publication Date
JPS56143765A true JPS56143765A (en) 1981-11-09
JPH0131344B2 JPH0131344B2 (en) 1989-06-26

Family

ID=12765699

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4709880A Granted JPS56143765A (en) 1980-04-10 1980-04-10 Processor for video signal

Country Status (1)

Country Link
JP (1) JPS56143765A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0089931A2 (en) * 1982-03-22 1983-09-28 Ing. C. Olivetti & C., S.p.A. Apparatus for scanning and digitally processing half-tone images
EP0279419A2 (en) * 1987-02-17 1988-08-24 Sharp Kabushiki Kaisha Image signal binary encoder
EP0297516A2 (en) * 1987-06-30 1989-01-04 Sharp Kabushiki Kaisha Picture signal binarization system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0089931A2 (en) * 1982-03-22 1983-09-28 Ing. C. Olivetti & C., S.p.A. Apparatus for scanning and digitally processing half-tone images
US4554594A (en) * 1982-03-22 1985-11-19 Ing. C. Olivetti & C., S.P.A. Apparatus for scanning and digitally processing half-tone images
EP0279419A2 (en) * 1987-02-17 1988-08-24 Sharp Kabushiki Kaisha Image signal binary encoder
EP0297516A2 (en) * 1987-06-30 1989-01-04 Sharp Kabushiki Kaisha Picture signal binarization system

Also Published As

Publication number Publication date
JPH0131344B2 (en) 1989-06-26

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