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 Title: |
US5001573:
Method of and apparatus for performing detail enhancement
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Sakamoto, Takashi; Kyoto, Japan
Hirosawa, Makoto; Kyoto, Japan
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| 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
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| Application Number: |
US1989000430459
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| IPC Code: |
Advanced:
G06T 5/00;
G06T 5/20;
IPC-7:
H04N 1/40;
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| ECLA Code: |
G06T5/00;
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| U.S. Class: |
Current:
358/447;
358/461;
358/463;
Original:
358/447;
358/461;
358/463;
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| Field of Search: |
358/446,447,448,452,461,455,458,462,463
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| Priority Number: |
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| 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.
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| Attorney, Agent or Firm: |
Lowe, Price, LeBlanc, Becker & Shur ;
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| Primary / Asst. Examiners: |
Coles, Sr., Edward L.; Grant, II, Jerome
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| Maintenance Status: |
E2 Expired Check current status
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| INPADOC Legal Status: |
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| Designated Country: |
DE FR GB IT
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| Family: |
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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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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 8 U.S. patent(s) that reference this one
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