JPS5799864A - Picture image binary-coding method - Google Patents

Picture image binary-coding method

Info

Publication number
JPS5799864A
JPS5799864A JP55175772A JP17577280A JPS5799864A JP S5799864 A JPS5799864 A JP S5799864A JP 55175772 A JP55175772 A JP 55175772A JP 17577280 A JP17577280 A JP 17577280A JP S5799864 A JPS5799864 A JP S5799864A
Authority
JP
Japan
Prior art keywords
coding method
picture image
image binary
gradations
image
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
JP55175772A
Other languages
Japanese (ja)
Inventor
Shinichi Oota
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 JP55175772A priority Critical patent/JPS5799864A/en
Publication of JPS5799864A publication Critical patent/JPS5799864A/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

Landscapes

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

Abstract

PURPOSE:To increase the number of gradations without increasing each image element in size when binary-coding the light and shade information on a light and shade image, by subdividing each matrix element in one direction. CONSTITUTION:Each matrix element of a dot matrix threshold pattern is subdivided only in one direction, and pulse-width modulation effect or dot weighting effect is utilized. Consequently, the number of gradations is increased without varying the size of each image element.
JP55175772A 1980-12-15 1980-12-15 Picture image binary-coding method Pending JPS5799864A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55175772A JPS5799864A (en) 1980-12-15 1980-12-15 Picture image binary-coding method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55175772A JPS5799864A (en) 1980-12-15 1980-12-15 Picture image binary-coding method

Publications (1)

Publication Number Publication Date
JPS5799864A true JPS5799864A (en) 1982-06-21

Family

ID=16001985

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55175772A Pending JPS5799864A (en) 1980-12-15 1980-12-15 Picture image binary-coding method

Country Status (1)

Country Link
JP (1) JPS5799864A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59161977A (en) * 1983-03-06 1984-09-12 Canon Inc Picture processor
US4912568A (en) * 1987-02-27 1990-03-27 Dainippon Screen Mfg. Co., Ltd. Halftone dot image recording apparatus and method employing high density screen pattern signal for light beam modulation
US4987484A (en) * 1983-03-06 1991-01-22 Canon Kabushiki Kaisha Halftone image signal processing apparatus in which pixels of a dither threshold pattern are each divided into an operator-selected number of micropixels

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59161977A (en) * 1983-03-06 1984-09-12 Canon Inc Picture processor
US4987484A (en) * 1983-03-06 1991-01-22 Canon Kabushiki Kaisha Halftone image signal processing apparatus in which pixels of a dither threshold pattern are each divided into an operator-selected number of micropixels
US4912568A (en) * 1987-02-27 1990-03-27 Dainippon Screen Mfg. Co., Ltd. Halftone dot image recording apparatus and method employing high density screen pattern signal for light beam modulation

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