JPS57160268A - Image forming device - Google Patents

Image forming device

Info

Publication number
JPS57160268A
JPS57160268A JP56045968A JP4596881A JPS57160268A JP S57160268 A JPS57160268 A JP S57160268A JP 56045968 A JP56045968 A JP 56045968A JP 4596881 A JP4596881 A JP 4596881A JP S57160268 A JPS57160268 A JP S57160268A
Authority
JP
Japan
Prior art keywords
gradations
image
bits
converter
forming device
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
JP56045968A
Other languages
Japanese (ja)
Inventor
Yoshikazu Yokomizo
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP56045968A priority Critical patent/JPS57160268A/en
Publication of JPS57160268A publication Critical patent/JPS57160268A/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
    • H04N1/4055—Halftoning, 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
    • H04N1/4057—Halftoning, 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 the pattern being a mixture of differently sized sub-patterns, e.g. spots having only a few different diameters

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To prevent the deterioration of capacity for display of gradation for an image forming device that performs a reproduction of multigradation, by compensating the linearity between the concentration of an original image and that of an image to be reproduced. CONSTITUTION:The image information given from a photoelectric transducer 11 is equidistantly divided into 4 bits and 16 gradations by an A/D converter 17 and with a prescribed threshold value and then delivered in the form of the digital video signals of 4 bits which show the level according to the concentration of an original image. A memory 16 supplies the data delivered from a dither matrix 14 as an address and then delivers the value suited to the linear compensation after setting it optionally at 8 gradations among 16 gradations. A comparator 18 compares the level of the video signal of 4 bits and 16 gradations given from the converter 17 with the signal having the threshold value of 8 levels supplied from the memory 16. Then an image is formed by a printer 15 based on the compared binary signal.
JP56045968A 1981-03-27 1981-03-27 Image forming device Pending JPS57160268A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56045968A JPS57160268A (en) 1981-03-27 1981-03-27 Image forming device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56045968A JPS57160268A (en) 1981-03-27 1981-03-27 Image forming device

Publications (1)

Publication Number Publication Date
JPS57160268A true JPS57160268A (en) 1982-10-02

Family

ID=12734024

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56045968A Pending JPS57160268A (en) 1981-03-27 1981-03-27 Image forming device

Country Status (1)

Country Link
JP (1) JPS57160268A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60214156A (en) * 1984-04-09 1985-10-26 Canon Inc Picture processor
JPS6297474A (en) * 1985-10-23 1987-05-06 Toshiba Corp Image processor
JPH0242873A (en) * 1988-02-18 1990-02-13 Matsushita Graphic Commun Syst Inc Method and device for processing picture signal
JPH02109467A (en) * 1988-10-19 1990-04-23 Canon Inc Picture reader

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60214156A (en) * 1984-04-09 1985-10-26 Canon Inc Picture processor
JPS6297474A (en) * 1985-10-23 1987-05-06 Toshiba Corp Image processor
JPH0242873A (en) * 1988-02-18 1990-02-13 Matsushita Graphic Commun Syst Inc Method and device for processing picture signal
JPH02109467A (en) * 1988-10-19 1990-04-23 Canon Inc Picture reader

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