JPS55161467A - Picture processing method - Google Patents

Picture processing method

Info

Publication number
JPS55161467A
JPS55161467A JP6904179A JP6904179A JPS55161467A JP S55161467 A JPS55161467 A JP S55161467A JP 6904179 A JP6904179 A JP 6904179A JP 6904179 A JP6904179 A JP 6904179A JP S55161467 A JPS55161467 A JP S55161467A
Authority
JP
Japan
Prior art keywords
picture element
small
picture
notice
density level
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
JP6904179A
Other languages
Japanese (ja)
Other versions
JPS6255345B2 (en
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 JP6904179A priority Critical patent/JPS55161467A/en
Priority to US06/139,395 priority patent/US4349846A/en
Priority to DE19803014884 priority patent/DE3014884A1/en
Publication of JPS55161467A publication Critical patent/JPS55161467A/en
Publication of JPS6255345B2 publication Critical patent/JPS6255345B2/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
    • 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)
  • Image Processing (AREA)
  • Editing Of Facsimile Originals (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To obtain a reproduced picture of high-density picture elements, by converting a notice picture element to a small picture element region and by forecasting the density level of each small picture element on a basis of the density level of the notice picture element and the density level of peripheral picture elements. CONSTITUTION:An input picture element signal is multiple-quantized by quantizer 1 and is stored in memory equipment 2. Operator 3 operates and forecasts the density level of each small picture element for division of the notice picture element according to contents of memory equipment 2. The forecasted result and the threshold level from memory equipment 5 where a threshold pattern is stored are decided by decider 4 to determine the black or white level of each small picture element. Consequently, since the notice picture element is divided into small picture elements and the density level is determined for every small picture element, a high- resolution reproduced picture can be obtained.
JP6904179A 1979-04-17 1979-06-02 Picture processing method Granted JPS55161467A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP6904179A JPS55161467A (en) 1979-06-02 1979-06-02 Picture 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
JP6904179A JPS55161467A (en) 1979-06-02 1979-06-02 Picture processing method

Publications (2)

Publication Number Publication Date
JPS55161467A true JPS55161467A (en) 1980-12-16
JPS6255345B2 JPS6255345B2 (en) 1987-11-19

Family

ID=13391098

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6904179A Granted JPS55161467A (en) 1979-04-17 1979-06-02 Picture processing method

Country Status (1)

Country Link
JP (1) JPS55161467A (en)

Also Published As

Publication number Publication date
JPS6255345B2 (en) 1987-11-19

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