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Title: US5001573: Method of and apparatus for performing detail enhancement
[ Derwent Title ]

Country: US United States of America

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35 pages

Inventor: Sakamoto, Takashi; Kyoto, Japan
Hirosawa, Makoto; Kyoto, Japan

Assignee: Dainippon Screen Mfg. Co., Ltd., Kyoto, Japan
other patents from DAINIPPON SCREEN MFG. CO., LTD. (133435) (approx. 1,048)
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Published / Filed: 1991-03-19 / 1989-11-02

Application Number: US1989000430459

IPC Code: Advanced: G06T 5/00; G06T 5/20;
IPC-7: H04N 1/40;

ECLA Code: G06T5/00;

U.S. Class: Current: 358/447; 358/461; 358/463;
Original: 358/447; 358/461; 358/463;

Field of Search: 358/446,447,448,452,461,455,458,462,463

Priority Number:
1988-11-07  JP1988000281008

Abstract:     Detail enhancement is achieved by producing an enhanced image signal (ES) on the basis of a sharp signal (S), a middle signal (M) and an unsharp signal (U). The sharp signal represents density of a pixel, the middle signal represents weighted mean density of a first area larger than a pixel, and the unsharp signal represents weighted mean density of a second area larger than the first area. Three differential signals (S-M, S-U, M-U) are obtained and multiplied by respective coefficients to become three enhancements signals. The enhanced image signal is obtained by adding the sharp signal and at least one of the three enhancement signals so that the detail enhancement is achieved at a middle range of spatial frequency.

Attorney, Agent or Firm: Lowe, Price, LeBlanc, Becker & Shur ;

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

Maintenance Status: E2 Expired  Check current status

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Designated Country: DE FR GB IT 

Family: Show 8 known family members

First Claim:
Show all 38 claims
What is claimed is:     1. A method of enhancing detail in an image by producing an enhanced image signal representing said image with said detail enhanced, comprising the steps of:
  • (a) scanning an original with respect to each pixel to produce a sharp signal representing density of each pixel, a middle signal representing weighted mean density of a first area about each pixel with a first weighting factor, and an unsharp signal representing weighted mean density of a second area about each pixel with a second weighting factor, said first area being larger than a pixel, said second area being still larger than said first area,
  • (b) obtaining a differential signal between said middle signal and said unsharp signal to produce a basic enhancement signal,
  • (c) multiplying said basic enhancement signal by a coefficient to produce an enhancement signal, and
  • (e) adding said sharp signal and said enhancement signal to produce said enhanced image signal.

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Forward References: Show 8 U.S. patent(s) that reference this one

U.S. References: Go to Result Set: All U.S. references   |  Forward references (8)   |   Backward references (6)   |   Citation Link

Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 6pp US4335407  1982-06 Atoji et al.  Dainippon Screen Seizo Kabushiki Kaisha Sharpness emphasizing method and machine used in a picture reproducing machine
Get PDF - 10pp US4484232  1984-11 Gast  Dr. Ing. Rudolf Hell GmbH Method and circuit arrangement for contrast intensification
Get PDF - 10pp US4536803  1985-08 Hennig  Dr. -Ing. Rudolf Hell GmbH Method and apparatus for intensifying contrast in printing formats
Get PDF - 7pp US4591923  1986-05 Urabe et al.  Fuji Photo Film Co., Ltd. Method and apparatus for intensifying sharpness of picture images
Get PDF - 13pp US4670793  1987-06 Yamada et al.  Dainippon Screen Mfg. Co., Ltd. Sharpness emphasis signal processing
Get PDF - 8pp US4785347  1988-11 Ezuka et al.  Fuji Photo Film Co., Ltd. Method for emphasizing sharpness of a picture image by forming and processing sharp and unsharp signals from a picture image signal
Foreign References: None

Other Abstract Info: DERABS G90-149167 JAPABS 140352P000143

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