JPS6336713B2 - - Google Patents

Info

Publication number
JPS6336713B2
JPS6336713B2 JP56143418A JP14341881A JPS6336713B2 JP S6336713 B2 JPS6336713 B2 JP S6336713B2 JP 56143418 A JP56143418 A JP 56143418A JP 14341881 A JP14341881 A JP 14341881A JP S6336713 B2 JPS6336713 B2 JP S6336713B2
Authority
JP
Japan
Prior art keywords
threshold
block
image
matrix
pixels
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.)
Expired
Application number
JP56143418A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5844861A (ja
Inventor
Shinji Tetsuya
Hiroshi Ochi
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP56143418A priority Critical patent/JPS5844861A/ja
Priority to GB08218275A priority patent/GB2103449B/en
Priority to US06/392,155 priority patent/US4547811A/en
Priority to FR8211292A priority patent/FR2508747B1/fr
Priority to DE3224319A priority patent/DE3224319C2/de
Publication of JPS5844861A publication Critical patent/JPS5844861A/ja
Publication of JPS6336713B2 publication Critical patent/JPS6336713B2/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
    • H04N1/40062—Discrimination between different image types, e.g. two-tone, continuous tone
    • 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
    • H04N1/40087—Multi-toning, i.e. converting a continuous-tone signal for reproduction with more than two discrete brightnesses or optical densities, e.g. dots of grey and black inks on white paper

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Discrete Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Image Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
JP56143418A 1981-06-29 1981-09-11 中間調信号処理方式 Granted JPS5844861A (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP56143418A JPS5844861A (ja) 1981-09-11 1981-09-11 中間調信号処理方式
GB08218275A GB2103449B (en) 1981-06-29 1982-06-24 Method and apparatus for gray level signal processing
US06/392,155 US4547811A (en) 1981-06-29 1982-06-25 Method and apparatus for gray level signal processing
FR8211292A FR2508747B1 (fr) 1981-06-29 1982-06-28 Procede et appareil pour determiner une zone d'image et pour corriger cette determination
DE3224319A DE3224319C2 (de) 1981-06-29 1982-06-29 Verfahren und Einrichtung zum Bestimmen der Art der Schwärzungsgradpegelverteilung einer Bildfläche

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56143418A JPS5844861A (ja) 1981-09-11 1981-09-11 中間調信号処理方式

Publications (2)

Publication Number Publication Date
JPS5844861A JPS5844861A (ja) 1983-03-15
JPS6336713B2 true JPS6336713B2 (enrdf_load_stackoverflow) 1988-07-21

Family

ID=15338288

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56143418A Granted JPS5844861A (ja) 1981-06-29 1981-09-11 中間調信号処理方式

Country Status (1)

Country Link
JP (1) JPS5844861A (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59205876A (ja) * 1983-05-10 1984-11-21 Canon Inc カラー画像処理装置
JPS60102060A (ja) * 1983-11-09 1985-06-06 Hitachi Ltd 画像二値化装置
JPS60232779A (ja) * 1984-05-02 1985-11-19 Ricoh Co Ltd 画像信号２値化装置
JPH0640661B2 (ja) * 1985-01-08 1994-05-25 富士ゼロックス株式会社 画像処理装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6042937B2 (ja) * 1977-01-28 1985-09-25 株式会社リコー 静電複写機のコピ−画質制御装置
JPS5476007A (en) * 1977-11-30 1979-06-18 Ricoh Co Ltd Picture reproducing system
US4196453A (en) * 1978-12-01 1980-04-01 Xerox Corporation Image screening system
JPS5580958A (en) * 1978-12-15 1980-06-18 Toshiba Corp Picture signal binary coding system
JPS5666970A (en) * 1979-11-06 1981-06-05 Toshiba Corp Binary device of variable density type picture

Also Published As

Publication number Publication date
JPS5844861A (ja) 1983-03-15

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