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Title: US5315406: Screen generation for halftone screening of images using arbitrary distribution of transformed screen coordinates
[ Derwent Title ]


Country: US United States of America

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16 pages

 
Inventor: Levien, Raphael L.; McDowell, VA 24458

Assignee: None

Published / Filed: 1994-05-24 / 1991-12-10

Application Number: US1991000805278

IPC Code: Advanced: H04N 1/405;
IPC-7: H04N 1/40;

ECLA Code: H04N1/405C6;

U.S. Class: Current: 358/003.2; 358/466; 358/534;
Original: 358/456; 358/459; 358/466; 358/534;

Field of Search: 358/400,401,429,452,455,456,457,458,465,466,75,80,296,298,77,451 101/211 H04N 140

Priority Number:
1991-12-10  US1991000805278
1991-09-03  US1991000753893
1991-09-27  US1991000768135

Abstract:     A halftone screen with precisely controlled angles and rulings, including irrational screen angles and rulings, for screening photographic images is generated by representing a desired screen pattern in an irregular or non-grid like array of screen elements. In one embodiment, a random array of screen elements is used. In another embodiment, a Poisson-disk distribution of screen elements is used to improve quality. The error between an ideal screen point and an actual screen point in the transformed UV space is calculated and used as the basis for selecting an actual screen point as having the least error between the ideal and actual screen points in UV space. The number of error calculations may be reduced by storing pointers the nearest points to each screen point in transformed UV space, and by storing a plurality of successive screen values at a given angle and screen ruling corresponding to each point in the transformed UV space.

Attorney, Agent or Firm: Jacobson, Allan ;

Primary / Asst. Examiners: Coles, Sr., Edward L.; Grant, II, Jerome

Maintenance Status: E2 Expired  Check current status

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Related Applications:
Application Number Filed Patent Pub. Date  Title
US1991000768135 1991-09-27       
US1991000753893 1991-09-03       


       
Parent Case:     This is a continuation-in-part application of U.S. patent application entitled, "SCREEN GENERATION FOR HALFTONE SCREENING OF IMAGES USING SCAN LINE SEGMENTS OF OVERSIZED SCREEN SCAN LINES", U.S. patent application Ser. No. 768,135 filed Sept. 27, 1991, which is a continuation in-part of U.S. patent application entitled, "SCREEN GENERATION FOR HALFTONE SCREENING OF IMAGES", U.S. patent application Ser. No. 753,893, filed Sept. 3, 1991.

Designated Country: DE DK FR GB 

Family: Show 25 known family members

First Claim:
Show all 44 claims
What is claimed is:     1. In a method for generating a halftone screened image from an original image at a desired screen angle, said method including storing a screen pattern as an array of elements representing a desired spot function, transforming a point from said original image to an ideal screen point, selecting an actual screen point in said stored screen pattern array of elements to form a generated screen pattern, and screening said original image with said generated screen pattern to form said halftone screened image, the improvement comprising:
  • computing an error function based on the error between said ideal screen point and actual points in said stored screen pattern array, wherein said step of computing an error function comprises computing an error vector between an actual screen point and said ideal screen point; and
  • selecting said actual screen point in said stored screen pattern which produces the least said computed error function.


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Forward References: Show 11 U.S. patent(s) that reference this one

       
U.S. References: Go to Result Set: All U.S. references   |  Forward references (11)   |   Backward references (6)   |   Citation Link

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Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 11pp US3657472  1972-04 Taudt et al.  Dr.-Ing. Rudolf Hell METHOD AND APPARATUS FOR THE DOT-BY-DOT AND LINE-BY-LINE RASTERED RECORDING OF PICTURE SIGNALS OBTAINED BY SCANNING PICTURE ORIGINALS WITH A RASTER ROTATED WITH RESPECT TO THE RECORDING DIRECTION
Get PDF - 21pp US4149194  1979-04 Holladay  Xerox Corporation Variable angle electronic halftone screening
Get PDF - 16pp US4185304  1980-01 Holladay  Xerox Corporation Electronic halftone screening
Get PDF - 11pp US4413286  1983-11 Boston  Optronics International, Inc. Method and apparatus involving digital screen generation
Get PDF - 10pp US4456924  1984-06 Rosenfeld  Scitex Corporation Ltd. Screened image reproduction
Get PDF - 22pp US4499489  1985-02 Gall et al.  Dr. Ing. Rudolf Hell GmbH Production of screen printing blocks
       
Foreign References:
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Publication Date IPC Code Assignee   Title
Get PDF - 12pp EP0303190A2 1988-08  H04N 1/40 FUJI PHOTO FILM CO LTD Method of forming halftone screen 
Get PDF - 20pp EP0427380A2 1990-08  H04N 1/40 ADOBE SYSTEMS INC Method of producing halftone images 
Get PDF - 16pp EP0493935 1992-07  H04N 1/40 E.I. DU PONT DE NEMOURS AND COMPANY Digital electronic system for halftone printing 
Get PDF - 27pp WO9102426 1991-02  H04N 1/40 INTERGRAPH CORP RAPID VARIABLE ANGLE DIGITAL SCREENING 


Other Abstract Info: DERABS G93-078625 DERG94-166826 DERABS G93-145528 DERABS G94-166826 DERABS G95-292678

Other References:
  • Wolberg, Digital Image Warping, IEEE Computer Society Press, Los Alamitos, pp. 173-176.


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