JPS5694876A - Video signal processing method - Google Patents

Video signal processing method

Info

Publication number
JPS5694876A
JPS5694876A JP17236179A JP17236179A JPS5694876A JP S5694876 A JPS5694876 A JP S5694876A JP 17236179 A JP17236179 A JP 17236179A JP 17236179 A JP17236179 A JP 17236179A JP S5694876 A JPS5694876 A JP S5694876A
Authority
JP
Japan
Prior art keywords
period
picture element
signal
reference level
main scanning
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
JP17236179A
Other languages
Japanese (ja)
Inventor
Yoshihiro Miyamoto
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP17236179A priority Critical patent/JPS5694876A/en
Publication of JPS5694876A publication Critical patent/JPS5694876A/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
    • H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
    • H04N1/4055—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern
    • H04N1/4056—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern the pattern varying in one dimension only, e.g. dash length, pulse width modulation [PWM]

Landscapes

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

Abstract

PURPOSE:To simplify the constitution of the main body device, by performing a binary coding with the reference level signal which varies regularly within the unit cycle of the picture element signal and at the same time shifting the phase of the reference level signal by an extent equivalent to the fixed picture element signal period and with every main scanning period. CONSTITUTION:The video signals 16-19 have the levels corresponding to the intermediate gradation part of the information pattern. For the unit cycles T6-T9 of the reference level signals 20-23 in each main scanning period, the phase is shifted by an extent equivalent to a picture element signal period and with every main scanning period in a cycle of the period of four picture element signals. Accordingly, the time point of comparison between the video signal and the reference level signal in each main scanning period is shifted by the period of a picture element signal, and the binary coded signals corresponding to the video signals 16-19 become the waveforms as shown by E, F, G and H respectively. The states of printing based on each binary coded signal are shown by I, J, K and L each. Thus the printing is carried out with the phase shifted by an extent equivalent to a picture element signal period.
JP17236179A 1979-12-27 1979-12-27 Video signal processing method Pending JPS5694876A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17236179A JPS5694876A (en) 1979-12-27 1979-12-27 Video signal processing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17236179A JPS5694876A (en) 1979-12-27 1979-12-27 Video signal processing method

Publications (1)

Publication Number Publication Date
JPS5694876A true JPS5694876A (en) 1981-07-31

Family

ID=15940472

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17236179A Pending JPS5694876A (en) 1979-12-27 1979-12-27 Video signal processing method

Country Status (1)

Country Link
JP (1) JPS5694876A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61225971A (en) * 1985-03-30 1986-10-07 Hitachi Ltd Method of generating picture element recording pulse signal

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4883724A (en) * 1972-02-08 1973-11-08
JPS4933414A (en) * 1972-07-27 1974-03-27
JPS5345537U (en) * 1976-09-22 1978-04-18
JPS54124923A (en) * 1978-03-23 1979-09-28 Tamura Electric Works Ltd Processing system for multi-gradation picture signal

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4883724A (en) * 1972-02-08 1973-11-08
JPS4933414A (en) * 1972-07-27 1974-03-27
JPS5345537U (en) * 1976-09-22 1978-04-18
JPS54124923A (en) * 1978-03-23 1979-09-28 Tamura Electric Works Ltd Processing system for multi-gradation picture signal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61225971A (en) * 1985-03-30 1986-10-07 Hitachi Ltd Method of generating picture element recording pulse signal
JPH0580862B2 (en) * 1985-03-30 1993-11-10 Hitachi Ltd

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