JPS572773A - Recording system for gradation image - Google Patents

Recording system for gradation image

Info

Publication number
JPS572773A
JPS572773A JP7679580A JP7679580A JPS572773A JP S572773 A JPS572773 A JP S572773A JP 7679580 A JP7679580 A JP 7679580A JP 7679580 A JP7679580 A JP 7679580A JP S572773 A JPS572773 A JP S572773A
Authority
JP
Japan
Prior art keywords
gradation
printing
picture
gradation image
information
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
JP7679580A
Other languages
Japanese (ja)
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 JP7679580A priority Critical patent/JPS572773A/en
Publication of JPS572773A publication Critical patent/JPS572773A/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
    • H04N1/40087—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

  • Physics & Mathematics (AREA)
  • Discrete Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Electronic Switches (AREA)
  • Fax Reproducing Arrangements (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To accomplish a simple and stable gradation image recording by a method wherein a plurality of heating elements are provided corresponding to one picture element of an original picture and the duration of supply of current to each element is varied, in a thermal recording system using a plurality of heating element. CONSTITUTION:One-line portion of information representing the gradations corresponding to the picture elements is transferred to a line buffer 6. A signal converting circuit 4 receives the gradation information and converts it into a driving signal corresponding to a printing unit 3. At this instant, one of the printing patterns which belong to the same gradation information is selected by a random number generating circuit 5. The heating elements 1' conduct a printing in a gradation of white, halftone or black under the function of the driving signal. Accordingly, a stable gradation image can be obtained by a system in which the whole gradation is obtained from coloring densities, and it is unnecessary to use paper of extreme smooth surface. In addition, since the pringing patterns are selected at random, it is possible to prevent the generation of grain direction streaks.
JP7679580A 1980-06-06 1980-06-06 Recording system for gradation image Pending JPS572773A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7679580A JPS572773A (en) 1980-06-06 1980-06-06 Recording system for gradation image

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7679580A JPS572773A (en) 1980-06-06 1980-06-06 Recording system for gradation image

Publications (1)

Publication Number Publication Date
JPS572773A true JPS572773A (en) 1982-01-08

Family

ID=13615564

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7679580A Pending JPS572773A (en) 1980-06-06 1980-06-06 Recording system for gradation image

Country Status (1)

Country Link
JP (1) JPS572773A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58158276A (en) * 1982-03-16 1983-09-20 Victor Co Of Japan Ltd Density controller for heat transfer type printer
JPS58165480A (en) * 1982-03-26 1983-09-30 Oki Electric Ind Co Ltd Gradation recording system
JPS6030265A (en) * 1983-07-28 1985-02-15 Fuji Xerox Co Ltd Thermal half-tone recording method
JPS60113582A (en) * 1983-11-24 1985-06-20 Ricoh Co Ltd Processing method of half tone picture
JPS6115468A (en) * 1984-06-30 1986-01-23 Toshiba Corp Thermal recorder
JPS62207067A (en) * 1986-03-07 1987-09-11 Toshiba Corp Multi-gradation recording system
JPH03142260A (en) * 1989-10-27 1991-06-18 Tokyo Electric Co Ltd Image formation
EP0647059A2 (en) * 1993-09-30 1995-04-05 Canon Kabushiki Kaisha Recording apparatus and control method therefor
US5912504A (en) * 1986-07-16 1999-06-15 Canon Kabushiki Kaisha Semiconductor photo-sensor and method for manufacturing the same
US6583582B2 (en) 2000-10-04 2003-06-24 Canon Kabushiki Kaisha Method of driving electron source and image-forming apparatus and method of manufacturing electron source and image-forming apparatus

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 (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58158276A (en) * 1982-03-16 1983-09-20 Victor Co Of Japan Ltd Density controller for heat transfer type printer
JPH0133073B2 (en) * 1982-03-26 1989-07-11 Oki Electric Ind Co Ltd
JPS58165480A (en) * 1982-03-26 1983-09-30 Oki Electric Ind Co Ltd Gradation recording system
JPS6030265A (en) * 1983-07-28 1985-02-15 Fuji Xerox Co Ltd Thermal half-tone recording method
JPS60113582A (en) * 1983-11-24 1985-06-20 Ricoh Co Ltd Processing method of half tone picture
JPH0515103B2 (en) * 1983-11-24 1993-02-26 Ricoh Kk
JPS6115468A (en) * 1984-06-30 1986-01-23 Toshiba Corp Thermal recorder
JPS62207067A (en) * 1986-03-07 1987-09-11 Toshiba Corp Multi-gradation recording system
US5912504A (en) * 1986-07-16 1999-06-15 Canon Kabushiki Kaisha Semiconductor photo-sensor and method for manufacturing the same
JPH03142260A (en) * 1989-10-27 1991-06-18 Tokyo Electric Co Ltd Image formation
EP0647059A2 (en) * 1993-09-30 1995-04-05 Canon Kabushiki Kaisha Recording apparatus and control method therefor
EP0647059A3 (en) * 1993-09-30 1995-07-26 Canon Kk Recording apparatus and control method therefor.
US5914731A (en) * 1993-09-30 1999-06-22 Canon Kabushiki Kaisha Data recording using randomized variations to prevent visual artifacts due to non-uniformities in a printing apparatus
US6583582B2 (en) 2000-10-04 2003-06-24 Canon Kabushiki Kaisha Method of driving electron source and image-forming apparatus and method of manufacturing electron source and image-forming apparatus

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