JPS572774A - Recording system for gradation image - Google Patents

Recording system for gradation image

Info

Publication number
JPS572774A
JPS572774A JP7679680A JP7679680A JPS572774A JP S572774 A JPS572774 A JP S572774A JP 7679680 A JP7679680 A JP 7679680A JP 7679680 A JP7679680 A JP 7679680A JP S572774 A JPS572774 A JP S572774A
Authority
JP
Japan
Prior art keywords
picture element
gradation
gradation image
paper
heating elements
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
JP7679680A
Other languages
Japanese (ja)
Other versions
JPH0326140B2 (en
Inventor
Kazunari Kubota
Yukio Tokunaga
Shigeki Ishii
Yasuhisa Ikeda
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 JP7679680A priority Critical patent/JPS572774A/en
Publication of JPS572774A publication Critical patent/JPS572774A/en
Publication of JPH0326140B2 publication Critical patent/JPH0326140B2/ja
Granted legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40Picture signal circuits
    • H04N1/405Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
    • H04N1/4055Halftoning, 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)
  • Color, Gradation (AREA)
  • Fax Reproducing Arrangements (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE:To record a gradation image easily and stably by thermal recording, by a method wherein a plurality of heating elements are provided corresponding to one side of each picture element, while a plurality of times of paper feeds are made to correspond to another side of the picture element so as to regulate the color-developing area of each picture element under heating. CONSTITUTION:A signal converting circuit 4 reads the gradation information corresponding to the picture element from a line buffer 6, and according to the output from a random number generating circuit 5, it selects one of the read-out gradation patterns shown in the figure and supplies current to the heating elements 1'. A plurality of patterns of the same gradation may be used in a cyclic manner instead of at random. Accordingly, since a thermal printing system involving development of colors to the saturation density is used, the present invention is stable to the changes in heat-sensitive paper used and the changes in environmental conditions, does not require paper of extremely smooth surface and enables duplication of copies. In addition, grain direction streaks and similar faults can be prevented, and a high-quality gradation image can be obtained.
JP7679680A 1980-06-06 1980-06-06 Recording system for gradation image Granted JPS572774A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7679680A JPS572774A (en) 1980-06-06 1980-06-06 Recording system for gradation image

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7679680A JPS572774A (en) 1980-06-06 1980-06-06 Recording system for gradation image

Publications (2)

Publication Number Publication Date
JPS572774A true JPS572774A (en) 1982-01-08
JPH0326140B2 JPH0326140B2 (en) 1991-04-09

Family

ID=13615597

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7679680A Granted JPS572774A (en) 1980-06-06 1980-06-06 Recording system for gradation image

Country Status (1)

Country Link
JP (1) JPS572774A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6042074A (en) * 1983-08-17 1985-03-06 Fuji Xerox Co Ltd Thermal halftone recording method
JPH01228854A (en) * 1988-03-10 1989-09-12 Canon Inc Recorder
JP2004104334A (en) * 2002-09-06 2004-04-02 Ricoh Co Ltd Image processing method and system thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5473650A (en) * 1977-11-25 1979-06-13 Keisatsuchiyou Chokan Gradation recording method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5473650A (en) * 1977-11-25 1979-06-13 Keisatsuchiyou Chokan Gradation recording method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6042074A (en) * 1983-08-17 1985-03-06 Fuji Xerox Co Ltd Thermal halftone recording method
JPH01228854A (en) * 1988-03-10 1989-09-12 Canon Inc Recorder
JP2004104334A (en) * 2002-09-06 2004-04-02 Ricoh Co Ltd Image processing method and system thereof

Also Published As

Publication number Publication date
JPH0326140B2 (en) 1991-04-09

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