ES481815A1 - Production of half tone facsimile separations with optional screen angles - Google Patents

Production of half tone facsimile separations with optional screen angles

Info

Publication number
ES481815A1
ES481815A1 ES481815A ES481815A ES481815A1 ES 481815 A1 ES481815 A1 ES 481815A1 ES 481815 A ES481815 A ES 481815A ES 481815 A ES481815 A ES 481815A ES 481815 A1 ES481815 A1 ES 481815A1
Authority
ES
Spain
Prior art keywords
screen
recording
locus
ordinates
recording medium
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
ES481815A
Other languages
Spanish (es)
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.)
Dr Ing Rudolf Hell GmbH
Original Assignee
Dr Ing Rudolf Hell 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 Dr Ing Rudolf Hell GmbH filed Critical Dr Ing Rudolf Hell GmbH
Publication of ES481815A1 publication Critical patent/ES481815A1/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
    • 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
    • H04N1/46—Colour picture communication systems
    • H04N1/52—Circuits or arrangements for halftone screening

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Image Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Color Image Communication Systems (AREA)
  • Screen Printers (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Abstract

A method for producing half-tone printing blocks having an optional screen angle and screen line spacing by line-wise scanning of an original and recording by means of a recording element displaced over a recording medium is described. The recording medium has co-ordinated with it an UV co-ordinate system directed in the line direction and and XY co-ordinate system turned through the screen angle, both co-ordinate systems being subdivided into areal elements from which the picture elements or half-tone dots to be produced are collated. Notwithstanding the screen angle beta , screen threshold values are associated with the areal elements of a limited scanning pattern range which corresponds to at least one mesh element of the screen which is to be recorded, as a function of their XY locus co-ordinates. During the recording operation, the UV locus co-ordinates of the areal elements momentarily traversed by the recording element are registered on the recording medium, are recalculated in the form of the corresponding XY locus co-ordinates of the limited screen scanning range under consideration of the screen angle, and the screen threshold values associated with the XY locus co-ordinates determined are "called up". A control signal which determines whether the areal element in question is or is not recorded on the recording medium as part of a screen element, is generated for the recording element by current comparison of the screen threshold values called up with the image signal obtained by scanning an original.
ES481815A 1978-06-23 1979-06-22 Production of half tone facsimile separations with optional screen angles Expired ES481815A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2827596A DE2827596C2 (en) 1978-06-23 1978-06-23 Method and arrangement for the production of screened printing forms

Publications (1)

Publication Number Publication Date
ES481815A1 true ES481815A1 (en) 1980-07-01

Family

ID=6042572

Family Applications (1)

Application Number Title Priority Date Filing Date
ES481815A Expired ES481815A1 (en) 1978-06-23 1979-06-22 Production of half tone facsimile separations with optional screen angles

Country Status (14)

Country Link
JP (1) JPS556393A (en)
AU (1) AU529655B2 (en)
CA (1) CA1127090A (en)
CH (1) CH643373A5 (en)
DD (1) DD144468A5 (en)
DE (1) DE2827596C2 (en)
ES (1) ES481815A1 (en)
FR (1) FR2429455A1 (en)
GB (1) GB2026283B (en)
IL (1) IL57630A (en)
IT (1) IT1121443B (en)
NL (1) NL182986C (en)
SE (1) SE435107B (en)
SU (1) SU1463125A3 (en)

Families Citing this family (61)

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DE3176685D1 (en) * 1980-09-01 1988-04-21 Crosfield Electronics Ltd A method of producing a half-tone reproduction
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US4499489A (en) * 1981-06-08 1985-02-12 Dr. Ing. Rudolf Hell Gmbh Production of screen printing blocks
JPS5880639A (en) * 1981-11-07 1983-05-14 Dainippon Screen Mfg Co Ltd Method for recording screen plate image
EP0079974B1 (en) * 1981-11-20 1987-02-04 DR.-ING. RUDOLF HELL GmbH Screen system for multicolour printing
US5666444A (en) * 1982-04-06 1997-09-09 Canon Kabushiki Kaisha Image processing apparatus
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JPS59161981A (en) * 1983-03-06 1984-09-12 Canon Inc Picture processor
GB8318835D0 (en) * 1983-07-12 1983-08-10 Crosfield Electronics Ltd Half-tone image reproducing
ATE29815T1 (en) * 1983-11-14 1987-10-15 Hell Rudolf Dr Ing Gmbh METHOD AND EQUIPMENT FOR THE PRODUCTION OF SCREENED PRINTING FORMS.
JPS60213170A (en) * 1984-04-06 1985-10-25 Dainippon Screen Mfg Co Ltd Generating method of dot pattern in picture scanning recorder
AT381401B (en) * 1984-06-04 1986-10-10 Weidinger Wolfgang METHOD FOR THE PRODUCTION OF SCREEN COLOR EXTENSIONS AND THE FURTHER PROCESSING THEREOF IN A FLEXO PRINTING FORM
JPH0657049B2 (en) * 1984-12-07 1994-07-27 大日本スクリ−ン製造株式会社 Halftone dot formation method
JPH0614187B2 (en) * 1984-10-11 1994-02-23 株式会社デイ・エス・スキヤナ− Halftone film making device
DE3614790A1 (en) * 1986-05-02 1987-11-05 Hell Rudolf Dr Ing Gmbh METHOD AND DEVICE FOR ELECTRONIC SIDE COMBINATION FOR REPRODUCTION TECHNOLOGY
GB8628238D0 (en) * 1986-11-26 1986-12-31 Crosfield Electronics Ltd Generating half-tone representations
JPS6444681A (en) * 1987-08-12 1989-02-17 Fuji Photo Film Co Ltd Dot screen forming method
DE3738014A1 (en) * 1987-11-09 1989-05-18 Winrich Dipl Ing Gall Method of generating coloured images on a carrier surface
JPH022042A (en) * 1987-12-18 1990-01-08 Contex Graphic Syst Inc Intermediate color printing system
JPH01228848A (en) * 1988-03-10 1989-09-12 Canon Inc Image forming apparatus
EP0585962A1 (en) * 1988-05-18 1994-03-09 Fuji Photo Film Co., Ltd. Halftone gradation image signal generating apparatus
US5172248A (en) * 1988-05-18 1992-12-15 Fuji Photo Film Co., Ltd. Method for forming halftone screen and apparatus therefor
US4916530A (en) * 1988-09-02 1990-04-10 Itek Graphix Corp. High resolution halftone dot generator system including LED array
US4924301A (en) * 1988-11-08 1990-05-08 Seecolor Corporation Apparatus and methods for digital halftoning
JPH0691620B2 (en) * 1988-11-15 1994-11-14 大日本スクリーン製造株式会社 Method for recording halftone image of color image
US4918622A (en) * 1988-11-16 1990-04-17 Eastman Kodak Company Electronic graphic arts screener
US4977458A (en) * 1988-11-16 1990-12-11 Eastman Kodak Company Apparatus for addressing a font to suppress Moire patterns occurring thereby and a method for use therein
JPH0666880B2 (en) * 1988-11-17 1994-08-24 大日本スクリーン製造株式会社 Halftone image forming method
US5053887A (en) * 1989-06-27 1991-10-01 Ibm Corporation Technique for producing a fine grained dithered halftone image having an increased number of gray levels
EP0418844B1 (en) * 1989-09-20 1997-12-03 Toyo Ink Mfg. Co., Ltd. Color image information processing method
EP0711067A3 (en) * 1989-11-21 1996-07-10 Toyo Ink Mfg Co Method to form density patterns for reproducing binary gradations
EP0454277B1 (en) * 1990-04-25 1996-07-03 Bayer Corporation Method for breaking-up symmetry of matrix elements in an electronic half-tone screening processs
JP2598723B2 (en) * 1990-06-28 1997-04-09 大日本スクリーン製造株式会社 Halftone image creation device
US5258832A (en) * 1990-09-14 1993-11-02 Minnesota Mining And Manufacturing Company Non-perpendicular, unequal frequency non-conventional screen patterns for electronic halftone generation
US5583660A (en) * 1990-09-14 1996-12-10 Minnesota Mining And Manufacturing Company Non-perpendicular, equal frequency non-conventional screen patterns for electronic halftone generation
US5264926A (en) * 1990-09-14 1993-11-23 Minnesota Mining And Manufacturing Company Perpendicular, equal frequency non-conventional screen patterns for electronic halftone generation
US5323245A (en) * 1990-09-14 1994-06-21 Minnesota Mining And Manufacturing Company Perpendicular, unequal frequency non-conventional screen patterns for electronic halftone generation
US5253084A (en) * 1990-09-14 1993-10-12 Minnesota Mining And Manufacturing Company General kernel function for electronic halftone generation
US5221971A (en) * 1990-11-21 1993-06-22 Polaroid Corporation Area modulation printing apparatus
EP0740458B1 (en) * 1991-02-08 2002-06-19 Adobe Systems Inc. Method of controlling dot size in digital halftoning with multi-cell threshold arrays
DE4107703C2 (en) * 1991-03-09 1994-07-21 Hell Ag Linotype Method and device for recording rasterized images
DE4108253C2 (en) * 1991-03-14 1995-04-27 Hell Ag Linotype Process and arrangement for producing screened color separations and printing forms
JPH077624A (en) * 1991-09-09 1995-01-10 Mitsubishi Paper Mills Ltd Dot picture recording method
DE4205085A1 (en) * 1992-02-17 1993-08-26 Mannesmann Ag METHOD AND CIRCUIT FOR GENERATING IMAGE INFORMATION (PIXMAPS)
JP2759186B2 (en) * 1992-10-21 1998-05-28 大日本スクリーン製造株式会社 Multicolor mesh image creation method
EP0631430A3 (en) * 1993-06-22 1995-02-22 Nippon Electric Co Color image processing apparatus capable of suppressing moire.
EP0680193B1 (en) * 1994-04-27 2000-07-12 Agfa-Gevaert N.V. Tone dependent rosette structures in multi layer screening by phase modulation
US6117334A (en) * 1995-01-10 2000-09-12 Coury; William S. Decontamination reactor system and method of using same
US6361697B1 (en) 1995-01-10 2002-03-26 William S. Coury Decontamination reactor system and method of using same
JPH08227147A (en) * 1995-02-21 1996-09-03 Dainippon Screen Mfg Co Ltd Dot forming method and device therefor
DE19722697A1 (en) * 1997-05-30 1998-12-03 Heidelberger Druckmasch Ag Process for digital screening of halftone images with screens of any screen width and screen angle
DE10022225B4 (en) * 2000-05-08 2015-12-17 Heidelberger Druckmaschinen Ag Multi-level screening with grids of any screen width and screen angle
JP2002356008A (en) * 2001-02-02 2002-12-10 Ricoh Co Ltd Image forming apparatus and method
DE60237256D1 (en) * 2001-03-14 2010-09-23 Ricoh Kk Light emission modulation with an effective method of producing gray tones in an image
DE10261004B4 (en) * 2002-12-24 2009-03-26 Heidelberger Druckmaschinen Ag Method for applying random numbers in the screening of image data
DE502007005952D1 (en) * 2007-06-06 2011-01-27 Weidlich Ernst Rudolf Gottfried Method for engraving a printing form by means of laser light
JP2009218736A (en) 2008-03-07 2009-09-24 Canon Inc Image forming apparatus and image forming method
DE102009042374A1 (en) 2008-10-20 2010-04-22 Heidelberger Druckmaschinen Ag Method for digital halftoning of halftone images

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4084183A (en) * 1970-03-18 1978-04-11 Dr. Ing. Rudolf Hell Gmbh. Method for the electro-optical reproduction of half-tone pictures
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
US3911480A (en) * 1972-12-08 1975-10-07 John P Brucker Generating screened half-tones by scanning
JPS5340292B2 (en) * 1973-08-31 1978-10-26
GB1495499A (en) * 1974-01-30 1977-12-21 Crosfield Electronics Ltd Image reproduction systems
DE2646926B2 (en) * 1976-10-18 1979-03-29 Dr.-Ing. Rudolf Hell Gmbh, 2300 Kiel Process for changing the pixel-wise decomposition of halftone images in the transition from reproduction to recording

Also Published As

Publication number Publication date
IT1121443B (en) 1986-04-02
FR2429455A1 (en) 1980-01-18
JPH0335867B2 (en) 1991-05-29
SU1463125A3 (en) 1989-02-28
GB2026283B (en) 1983-01-06
DE2827596C2 (en) 1984-11-22
CH643373A5 (en) 1984-05-30
NL182986B (en) 1988-01-18
NL182986C (en) 1988-06-16
NL7904904A (en) 1979-12-28
AU529655B2 (en) 1983-06-16
JPS556393A (en) 1980-01-17
AU4831179A (en) 1980-01-03
SE7905507L (en) 1979-12-24
IL57630A0 (en) 1979-10-31
IT7923661A0 (en) 1979-06-18
DE2827596A1 (en) 1980-02-07
FR2429455B1 (en) 1984-10-19
IL57630A (en) 1982-03-31
DD144468A5 (en) 1980-10-15
SE435107B (en) 1984-09-03
GB2026283A (en) 1980-01-30
CA1127090A (en) 1982-07-06

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Legal Events

Date Code Title Description
FD1A Patent lapsed

Effective date: 19970203