WO1991002426A3 - Rapid variable angle digital screening - Google Patents

Rapid variable angle digital screening Download PDF

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Publication number
WO1991002426A3
WO1991002426A3 PCT/US1990/004185 US9004185W WO9102426A3 WO 1991002426 A3 WO1991002426 A3 WO 1991002426A3 US 9004185 W US9004185 W US 9004185W WO 9102426 A3 WO9102426 A3 WO 9102426A3
Authority
WO
WIPO (PCT)
Prior art keywords
screen
tile
variable angle
rapid variable
angle digital
Prior art date
Application number
PCT/US1990/004185
Other languages
French (fr)
Other versions
WO1991002426A2 (en
Inventor
Robert C Kidd
J Brett Lefebvre
Original Assignee
Intergraph 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 Intergraph Corp filed Critical Intergraph Corp
Publication of WO1991002426A2 publication Critical patent/WO1991002426A2/en
Publication of WO1991002426A3 publication Critical patent/WO1991002426A3/en

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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

Abstract

A method for reproducing images using rotated screens, wherein the rotated screens are formed by the replication of a screen tile (ABCD). The screen tile (ABCD) is based on a seed screen cell (11, 17) that is disposed at the desired angle of screen rotation, theta, and is replicated so as to fill the screen tile. Thus, the screen can be generated by replicating the screen tile with respect to the same coordinate system as that identifying addresses for the image data being screened, i.e., without rotating the screen tile. Both the screen tile and the seed screen cell (11, 17) are represented by matrices. Noise (51) can be introduced into process of forming the screen in order to further lessen Moire patterns.
PCT/US1990/004185 1989-08-04 1990-07-20 Rapid variable angle digital screening WO1991002426A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US38983589A 1989-08-04 1989-08-04
US389,835 1989-08-04

Publications (2)

Publication Number Publication Date
WO1991002426A2 WO1991002426A2 (en) 1991-02-21
WO1991002426A3 true WO1991002426A3 (en) 1991-03-21

Family

ID=23539912

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1990/004185 WO1991002426A2 (en) 1989-08-04 1990-07-20 Rapid variable angle digital screening

Country Status (1)

Country Link
WO (1) WO1991002426A2 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4107703C2 (en) * 1991-03-09 1994-07-21 Hell Ag Linotype Method and device for recording rasterized images
US5150428A (en) * 1991-04-01 1992-09-22 Eastman Kodak Company Method for generating halftone image data with randomly selected threshold array
US5155599A (en) * 1991-07-25 1992-10-13 Miles, Inc. Screening system and method for color reproduction in offset printing
US5315406A (en) * 1991-09-03 1994-05-24 Levien Raphael L Screen generation for halftone screening of images using arbitrary distribution of transformed screen coordinates
EP0606312B1 (en) * 1991-10-02 1998-09-09 Océ Printing Systems GmbH Process and arrangement for producing screen angles in digital printing
DE69735250T8 (en) * 1996-05-17 2007-03-08 Dainippon Screen Mfg. Co., Ltd. Method and apparatus for generating halftone screen dots
US7667875B2 (en) 2006-06-09 2010-02-23 Xerox Corporation Textured HT screens for improved uniformity appearance

Citations (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
FR2535477A1 (en) * 1982-10-28 1984-05-04 Dainippon Screen Mfg METHOD FOR PRODUCING HALF-TINT POINTS IN A HALF-TINT PLATE RECORDING DEVICE
US4578714A (en) * 1981-03-30 1986-03-25 Canon Kabushiki Kaisha Halftone image recording apparatus
EP0141869B1 (en) * 1983-11-14 1987-09-16 DR.-ING. RUDOLF HELL GmbH Method and apparatus for manufacturing screened printing forms
EP0274196A1 (en) * 1986-11-26 1988-07-13 Crosfield Electronics Limited Generating half-tone representations
EP0293214A2 (en) * 1987-05-29 1988-11-30 Digital Equipment Corporation System for producing dithered images on asymmetric grids

Patent Citations (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
US4578714A (en) * 1981-03-30 1986-03-25 Canon Kabushiki Kaisha Halftone image recording apparatus
FR2535477A1 (en) * 1982-10-28 1984-05-04 Dainippon Screen Mfg METHOD FOR PRODUCING HALF-TINT POINTS IN A HALF-TINT PLATE RECORDING DEVICE
EP0141869B1 (en) * 1983-11-14 1987-09-16 DR.-ING. RUDOLF HELL GmbH Method and apparatus for manufacturing screened printing forms
EP0274196A1 (en) * 1986-11-26 1988-07-13 Crosfield Electronics Limited Generating half-tone representations
EP0293214A2 (en) * 1987-05-29 1988-11-30 Digital Equipment Corporation System for producing dithered images on asymmetric grids

Also Published As

Publication number Publication date
WO1991002426A2 (en) 1991-02-21

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