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US5065255A
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Method of and apparatus for smoothing an image having a periodic pattern
Assignee: Fujifilm Holdings Corp
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Filing: 1990-06-26
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Granted: 1991-11-12
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Expires: 2010-06-26
Abstract
Abstract An image signal representing image information containing a periodic pattern is processed before it is broken up into halftone dots. First, the image information is averaged to generate an unsharpness signal, and then the unsharpness signal is processed for edge sharpness to generate a sharpness signal. Thereafter, a halftone-dot image is generated from the sharpness signal. More specifically, the sharpness signal Sij* is generated from a first unsharpness signal Uij which is produced by averaging the image information and a second unsharpness signal Uij which is produced by averaging the first unsharpness signal Uij, according to the equation: Sij*=Uij+K·(Uij-Uij) where i=1, 2, . . . n, j=1,2, . . . n, and K: sharpness parameter. The halftone-dot image thus reproduced is sharp and free of a moire pattern which would otherwise result from the periodic pattern.
Inventors
- 👤 Hideaki Kimura
- 👤 Haruo Aoki
- 👤 Hiromi Yazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:41
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/409; H04N1/4092; H04N1/40075
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
57 words
A method for processing an image signal representing image information containing a periodic pattern comprising the steps of: averaging the image information for removing periodic pattern components from said image signal to generate an unsharpness signal; processing said unsharpness signal for edge sharpness to generate a sharpness signal; and generating a halftone-dot image from said sharpness signal.
Claim 2
Independent Claim
57 words
A method for processing an image signal representing image information containing a periodic pattern comprising the steps of: averaging the image information for removing periodic pattern components from said image signal to generate an unsharpness signal; processing said unsharpness signal for edge sharpness to generate a sharpness signal; and generating a halftone-dot image from said sharpness signal.
Claim 3
Dependent Claim
68 words
A method according to claim 1, further including the step of generating the sharpness signal Sij* from a first unsharpness signal Uij which is produced by averaging the image information and a second unsharpness signal Uij which is produced by averaging said first unsharpness signal Uij, according to the equation: Sij*=Uij+K·(Uij-Uij) where j=1, 2, . . . n, j=1, 2, . . . n, and K: sharpness parameter.
Claim 4
Independent Claim
67 words
An apparatus for processing an image signal representing image information containing a periodic pattern, comprising: unsharpness processor means for averaging the image information for removing periodic pattern components from said image signal to generate an unsharpness signal; sharpness processor means for processing said unsharpness signal for edge sharpness to generate a sharpness signal; and halftone-dot image generator means for generating a halftone-dot image from said sharpness signal.
Claim 5
Independent Claim
67 words
An apparatus for processing an image signal representing image information containing a periodic pattern, comprising: unsharpness processor means for averaging the image information for removing periodic pattern components from said image signal to generate an unsharpness signal; sharpness processor means for processing said unsharpness signal for edge sharpness to generate a sharpness signal; and halftone-dot image generator means for generating a halftone-dot image from said sharpness signal.
Claim 6
Independent Claim
94 words
An apparatus for processing an image signal representing image information containing a periodic pattern, comprising: unsharpness processor means for averaging the image information to generate an unsharpness signal; sharpness processor means for processing said unsharpness signal for edge sharpness to generate a sharpness signal; memory means for storing said unsharpness signal; signal selector means for selectively transmitting the image signal representing the image information to said unsharpness processor and said unsharpness signal from said memory means to said sharpness processor; and halftone-dot image generator means for generating a halftone-dot image from said sharpness signal.
Claim 7
Independent Claim
94 words
An apparatus for processing an image signal representing image information containing a periodic pattern, comprising: unsharpness processor means for averaging the image information to generate an unsharpness signal; sharpness processor means for processing said unsharpness signal for edge sharpness to generate a sharpness signal; memory means for storing said unsharpness signal; signal selector means for selectively transmitting the image signal representing the image information to said unsharpness processor and said unsharpness signal from said memory means to said sharpness processor; and halftone-dot image generator means for generating a halftone-dot image from said sharpness signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-11 | 1995-05-13 | 1995-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-11 | 1999-05-13 | 1999-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-11 | 2003-05-13 | 2003-11-12 | $7700.00 | Window Closed / Lapsed |