JPS55138969A - Image processing method - Google Patents

Image processing method

Info

Publication number
JPS55138969A
JPS55138969A JP4707279A JP4707279A JPS55138969A JP S55138969 A JPS55138969 A JP S55138969A JP 4707279 A JP4707279 A JP 4707279A JP 4707279 A JP4707279 A JP 4707279A JP S55138969 A JPS55138969 A JP S55138969A
Authority
JP
Japan
Prior art keywords
picture element
density
memory
stored
small
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
JP4707279A
Other languages
Japanese (ja)
Inventor
Keiji Sekikawa
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP4707279A priority Critical patent/JPS55138969A/en
Priority to US06/139,395 priority patent/US4349846A/en
Priority to DE19803014884 priority patent/DE3014884A1/en
Publication of JPS55138969A publication Critical patent/JPS55138969A/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
    • H04N1/4051—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a dispersed dots halftone pattern, the dots having substantially the same size

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Preparing Plates And Mask In Photomechanical Process (AREA)
  • Image Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To predict density of each picture element by means of density level of a remarkable picture element and a density level of each peripheral picture element in the specific picture element area centering around the foregoing. CONSTITUTION:As for an input picture element signal, its density information is subjected to multivalue quantization by a quantizer 1. And the quantized signal is sent to the memory 2, and the density level information in the specific picture element area is stored. The predictive density levels q1-q4 of each small picture element in case the remarkable element has been divided into four depending upon the contents of the memory 2 are calculated by the arithmetic unit 3, and are stored in the memory 4. The threshold corresponding to each small picture element is called from ROM5 which has stored a daze pattern, and is compared with the levels q1-q4 by the comparator 6. As a result of the foregoing, a black or white level of each small picture element is decided and a binary picture element signal whose picture element has been made to have high density is output.
JP4707279A 1979-04-17 1979-04-17 Image processing method Pending JPS55138969A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP4707279A JPS55138969A (en) 1979-04-17 1979-04-17 Image processing method
US06/139,395 US4349846A (en) 1979-04-17 1980-04-11 Picture processing method
DE19803014884 DE3014884A1 (en) 1979-04-17 1980-04-17 IMAGE PROCESSING PROCESS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4707279A JPS55138969A (en) 1979-04-17 1979-04-17 Image processing method

Publications (1)

Publication Number Publication Date
JPS55138969A true JPS55138969A (en) 1980-10-30

Family

ID=12764955

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4707279A Pending JPS55138969A (en) 1979-04-17 1979-04-17 Image processing method

Country Status (1)

Country Link
JP (1) JPS55138969A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57142072A (en) * 1981-02-27 1982-09-02 Canon Inc Video signal processor
JPS57159173A (en) * 1981-03-26 1982-10-01 Canon Inc Image processor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57142072A (en) * 1981-02-27 1982-09-02 Canon Inc Video signal processor
JPH0131753B2 (en) * 1981-02-27 1989-06-27 Canon Kk
JPS57159173A (en) * 1981-03-26 1982-10-01 Canon Inc Image processor
JPH039676B2 (en) * 1981-03-26 1991-02-08 Canon Kk

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