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Title: US5067025: Method of recording halftone dot image
[ Derwent Title ]


Country: US United States of America

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26 pages

 
Inventor: Kitagawa, Osamu; Kyoto, Japan

Assignee: Dainippon Screen Mfg. Co., Ltd. Japan
other patents from DAINIPPON SCREEN MFG. CO., LTD. (133435) (approx. 1,048)
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Published / Filed: 1991-11-19 / 1990-09-14

Application Number: US1990000582236

IPC Code: Advanced: G03F 5/00; H04N 1/405; H04N 1/46; H04N 1/48; H04N 1/52;
Core: more...
IPC-7: H04N 1/23;

U.S. Class: Current: 358/003.2; 358/003.06; 358/003.26; 358/500;
Original: 358/298; 358/458; 358/456; 358/075;

Field of Search: 346/140 R 358/075,78,80,298,454,455,456,457,458

Priority Number:
1989-09-14  JP1989000239056

Abstract: Screen patterns for respective color components are represented by arrays of unit regions. The arrays for respective color components have a same array pitch and a same array orientation. Color component images are converted into color component halftone dot images through the screen patterns. When the density of the color component images is in a predetermined range, the color component halftone dot images have a plurality of linear dot elements in each unit region. The plurality of linear dot elements extend in a predetermined direction which is different for each color component.

Attorney, Agent or Firm: Ostrolenk, Faber, Gerb & Soffen ;

Primary / Asst. Examiners: Shoop, Jr., William M.; Moskowitz, Larry

Maintenance Status: E3 Expired  Check current status

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Designated Country: DE FR GB 

Family: Show 9 known family members

First Claim:
Show all 15 claims
I claim:     1. A method of recording a halftone dot color image on a recording medium, comprising the steps of:
  • (a) separating an original image into a plurality of color component images;
  • (b) converting said plurality of color component images into a plurality of color component halftone dot images under a procedure including the following conditions (b-1) through (b-5);
  • (b-1) said plurality of color component halftone dot images have respective arrays of unit regions defining cells in halftone dot representation;
  • (b-2) said respective arrays of unit regions have a substantially same array pitch and a substantially same orientation;
  • (b-3) a plurality of core positions are defined in each unit region in said respective arrays;
  • (b-4) a plurality of linear dot elements which have a substantially same area and which extend from said plurality of core positions along respective predetermined directions are obtained in said unit regions when a halftone dot area rate of corresponding color component halftone dot image is in a predetermined range of dot area rate; and
  • (b-5) said respective predetermined directions are different for each color component halftone dot image; and
  • (c) overprinting said plurality of color component halftone dot images on a recording medium to obtain a halftone dot color image on said recording medium.


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Forward References: Show 16 U.S. patent(s) that reference this one

       
U.S. References: Go to Result Set: All U.S. references   |  Forward references (16)   |   Backward references (3)   |   Citation Link

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PDF
Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 32pp US4814886  1989-03 Kuge et al.  Canon Kabushiki Kaisha Image processing process and apparatus therefor
Get PDF - 24pp US4903123  1990-02 Kawamura et al.  Canon Kabushiki Kaisha Image processing apparatus using inclined line screens to reduce Moire
Get PDF - 35pp US4924301  1990-05 Surbrook  SeeColor Corporation Apparatus and methods for digital halftoning
       
Foreign References: None

Other Abstract Info: DERABS G91-118743

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