JPS5799865A - Picture image binary-coding method - Google Patents

Picture image binary-coding method

Info

Publication number
JPS5799865A
JPS5799865A JP55175773A JP17577380A JPS5799865A JP S5799865 A JPS5799865 A JP S5799865A JP 55175773 A JP55175773 A JP 55175773A JP 17577380 A JP17577380 A JP 17577380A JP S5799865 A JPS5799865 A JP S5799865A
Authority
JP
Japan
Prior art keywords
dot matrix
binary
image
threshold pattern
gradations
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
JP55175773A
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 JP55175773A priority Critical patent/JPS5799865A/en
Publication of JPS5799865A publication Critical patent/JPS5799865A/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 obtain a good-looking image by using a dot matrix threshold pattern which spreads from two points of a dot matrix as kernels to a circumference successively, when obtaining a binary-coded image signal by making a comparison with the dot matrix threshold pattern. CONSTITUTION:A dot matrix threshold pattern which corresponds to succeeding gradations is formed by arrays of fine image elements spreading from two fine image elements 0 and 1 as kernels successively to a circumference. Then, this dot matrix threshold pattern is used to obtain a binary-coded image from a light and shade image. Consequently, the correlation between the gradations of the binary-coded image and mean brightness or mean density is excellent, and no visual nonlinearity of gradations is generated.
JP55175773A 1980-12-15 1980-12-15 Picture image binary-coding method Pending JPS5799865A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55175773A JPS5799865A (en) 1980-12-15 1980-12-15 Picture image binary-coding method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55175773A JPS5799865A (en) 1980-12-15 1980-12-15 Picture image binary-coding method

Publications (1)

Publication Number Publication Date
JPS5799865A true JPS5799865A (en) 1982-06-21

Family

ID=16002003

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55175773A Pending JPS5799865A (en) 1980-12-15 1980-12-15 Picture image binary-coding method

Country Status (1)

Country Link
JP (1) JPS5799865A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3346316A1 (en) * 1982-12-27 1984-07-12 Kabushiki Kaisha Sakata Shokai, Osaka METHOD AND DEVICE FOR GENERATING GRID IMAGES
US7301676B2 (en) * 2001-06-26 2007-11-27 Fujitsu Limited Printing method and apparatus, and binary-form dither matrix pattern

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3346316A1 (en) * 1982-12-27 1984-07-12 Kabushiki Kaisha Sakata Shokai, Osaka METHOD AND DEVICE FOR GENERATING GRID IMAGES
US4556918A (en) * 1982-12-27 1985-12-03 Kabushiki Kaisha Sakata Shokai Method and apparatus for generating screened halftone images
US7301676B2 (en) * 2001-06-26 2007-11-27 Fujitsu Limited Printing method and apparatus, and binary-form dither matrix pattern

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