GB2012517A - A half tone facsimile reproduction method group - Google Patents

A half tone facsimile reproduction method group

Info

Publication number
GB2012517A
GB2012517A GB7845420A GB7845420A GB2012517A GB 2012517 A GB2012517 A GB 2012517A GB 7845420 A GB7845420 A GB 7845420A GB 7845420 A GB7845420 A GB 7845420A GB 2012517 A GB2012517 A GB 2012517A
Authority
GB
United Kingdom
Prior art keywords
notional
reproduction method
half tone
facsimile reproduction
define
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
GB7845420A
Other versions
GB2012517B (en
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.)
HELL R DR ING GmbH
Original Assignee
HELL R DR ING GmbH
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 HELL R DR ING GmbH filed Critical HELL R DR ING GmbH
Publication of GB2012517A publication Critical patent/GB2012517A/en
Application granted granted Critical
Publication of GB2012517B publication Critical patent/GB2012517B/en
Expired 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
    • H04N1/4058—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 with details for producing a halftone screen at an oblique angle

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Woven Fabrics (AREA)
  • Fax Reproducing Arrangements (AREA)
  • Character Input (AREA)
  • Color Printing (AREA)

Abstract

An orthogonal pattern of screen centers 1* to 4* is used to define centers of notional elemental squares having black portions of a size determined by grey level, in diagonally opposed corners. When the black portions are printed by scanning, four group together, 1 to 4, at the corners of the notional squares to define a screen dot the center of which is shifted towards the darker region in areas of light/dark transitions. The range of notional square patterns corresponding to available grey levels is stored... <IMAGE>
GB7845420A 1977-11-23 1978-11-21 Screens for producing continuous-tone pictures Expired GB2012517B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2752164A DE2752164C3 (en) 1977-11-23 1977-11-23 Scanned photomechanical printing form production

Publications (2)

Publication Number Publication Date
GB2012517A true GB2012517A (en) 1979-07-25
GB2012517B GB2012517B (en) 1982-04-15

Family

ID=6024358

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7845420A Expired GB2012517B (en) 1977-11-23 1978-11-21 Screens for producing continuous-tone pictures

Country Status (6)

Country Link
JP (1) JPS5476301A (en)
DE (1) DE2752164C3 (en)
FR (1) FR2410304B1 (en)
GB (1) GB2012517B (en)
IT (1) IT1100227B (en)
NL (1) NL177051C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2249910A (en) * 1990-11-19 1992-05-20 Le Proizv Ob Poligraficheskogo Method of making a half-tone reproduction of an image

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57155541A (en) * 1981-03-23 1982-09-25 Dainippon Printing Co Ltd Formation of halftone dot for printing
DE4011689A1 (en) * 1990-04-06 1991-10-17 Berthold Ag H Forming half tone raster points - de-arranging regularity of arrangement between density values and partial raster spot forms to achieve desired irregularity

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2012728C3 (en) * 1970-03-18 1974-09-19 Dr.-Ing. Rudolf Hell Gmbh, 2300 Kiel Process for the electro-optical recording of screened halftone images

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2249910A (en) * 1990-11-19 1992-05-20 Le Proizv Ob Poligraficheskogo Method of making a half-tone reproduction of an image
GB2249910B (en) * 1990-11-19 1994-11-30 Le Proizv Ob Poligraficheskogo Method of and apparatus for making a half-tone reproduction of an image

Also Published As

Publication number Publication date
NL7810880A (en) 1979-05-28
JPS5476301A (en) 1979-06-18
DE2752164C3 (en) 1980-11-20
GB2012517B (en) 1982-04-15
DE2752164B2 (en) 1980-03-20
IT7829781A0 (en) 1978-11-15
DE2752164A1 (en) 1979-05-31
FR2410304A1 (en) 1979-06-22
FR2410304B1 (en) 1987-02-13
IT1100227B (en) 1985-09-28
NL177051C (en) 1985-07-16
JPS5723256B2 (en) 1982-05-18

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19931121