Patent US6278802B1 successfully refreshed from Google Patents.
US6278802B1
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US
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Frequency-modulation halftone screen and method for making same
Assignee: Agfa NV
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Filing: 1997-10-15
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Granted: 2001-08-21
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Expires: 2017-10-15
Abstract
Abstract A frequency-modulation halftone screen and method that enable the use of relatively large frequency-modulation halftone dots, which have desirable reprographic characteristics, in combination with high resolution rendering of text, graphics, and boundary information in general.
Inventors
- 👤 Paul A. Delabastita
- 👤 Frank A. Deschuytere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:02
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/405; H04N1/4051
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
121 words
A method for recording a FREQUENCY-MODULATION HALFTONE IMAGE using a recorder, said method comprising the following steps: (A) rendering a CONTONE IMAGE at a RECORDER RESOLUTION; (B) storing said CONTONE IMAGE as CONTONE DATA VALUES in a first memory store; (C) generating THRESHOLD VALUES at a resolution which is different from said RECORDER RESOLUTION; (D) converting the resolution of said THRESHOLD VALUES to said RECORDER RESOLUTION; (E) comparing each of the CONTONE DATA VALUES of said first memory store in sequence with a corresponding THRESHOLD VALUE; (F) storing the result of said comparison as a HALFTONE DATA VALUE in a second memory store, constituting the FREQUENCY-MODULATION HALFTONE IMAGE; and, (G) recording the HALFTONE IMAGE on a photosensitive material using the recorder.
Claim 2
Independent Claim
121 words
A method for recording a FREQUENCY-MODULATION HALFTONE IMAGE using a recorder, said method comprising the following steps: (A) rendering a CONTONE IMAGE at a RECORDER RESOLUTION; (B) storing said CONTONE IMAGE as CONTONE DATA VALUES in a first memory store; (C) generating THRESHOLD VALUES at a resolution which is different from said RECORDER RESOLUTION; (D) converting the resolution of said THRESHOLD VALUES to said RECORDER RESOLUTION; (E) comparing each of the CONTONE DATA VALUES of said first memory store in sequence with a corresponding THRESHOLD VALUE; (F) storing the result of said comparison as a HALFTONE DATA VALUE in a second memory store, constituting the FREQUENCY-MODULATION HALFTONE IMAGE; and, (G) recording the HALFTONE IMAGE on a photosensitive material using the recorder.
Claim 3
Independent Claim
132 words
A method for recording a FREQUENCY-MODULATION HALFTONE IMAGE using a recorder, said method comprising the steps of: (A) rendering a CONTONE IMAGE at a RECORDER RESOLUTION; (B) storing said CONTONE IMAGE as CONTONE DATA VALUES in a first memory store; (C) generating THRESHOLD VALUES at a resolution which is different from said RECORDER RESOLUTION; (D) converting said resolution of said THRESHOLD VALUES to said RECORDER RESOLUTION; (E) storing said converted THRESHOLD VALUES in a matrix; (F) comparing each of the CONTONE DATA VALUES of said first memory store in sequence with corresponding THRESHOLD VALUES in said matrix; (G) storing the result of said comparison as a HALFTONE DATA VALUE in a second memory store, constituting the FREQUENCY-MODULATION HALFTONE IMAGE; and, (H) recording the HALFTONE IMAGE on a photosensitive material using the recorder.
Claim 4
Independent Claim
132 words
A method for recording a FREQUENCY-MODULATION HALFTONE IMAGE using a recorder, said method comprising the steps of: (A) rendering a CONTONE IMAGE at a RECORDER RESOLUTION; (B) storing said CONTONE IMAGE as CONTONE DATA VALUES in a first memory store; (C) generating THRESHOLD VALUES at a resolution which is different from said RECORDER RESOLUTION; (D) converting said resolution of said THRESHOLD VALUES to said RECORDER RESOLUTION; (E) storing said converted THRESHOLD VALUES in a matrix; (F) comparing each of the CONTONE DATA VALUES of said first memory store in sequence with corresponding THRESHOLD VALUES in said matrix; (G) storing the result of said comparison as a HALFTONE DATA VALUE in a second memory store, constituting the FREQUENCY-MODULATION HALFTONE IMAGE; and, (H) recording the HALFTONE IMAGE on a photosensitive material using the recorder.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-08-20 | 2005-02-19 | 2005-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-08-20 | 2009-02-19 | 2009-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-08-20 | 2013-02-19 | 2013-08-21 | $7700.00 | Window Closed / Lapsed |