Patent US5777686A successfully refreshed from Google Patents.
US5777686A
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Video frame grabber comprising analog video signals analysis system
Assignee: Agfa HealthCare NV
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Filing: 1997-02-03
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Granted: 1998-07-07
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Expires: 2017-02-03
Abstract
Abstract In a video frame grabber for digitizing analog video signals which have a pure analog video signal component and a synchronization signal component, the synchronization signals are digitized along with the pure analog video signals. Video gain and offset, sync gain, and sync threshold can be adjusted electronically. A variable time delay can be imposed on the sampling clock signals and on horizontal reference signals. Optimal values can be determined for the various parameters.
Inventors
- 👤 Jos Jennes
- 👤 Paul Wouters
- 👤 Paul Canters
- 👤 Herman Van Goubergen
- 👤 Geert Debeerst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:27
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/00127; H04N1/00281; H04N1/00283; H04N1/00291; H04N1/32; H04N1/32358; H04N5/00; H04N5/04; H04N5/06; H04N5/12; H04N5/126; H04N5/14; H04N5/20; H04N5/44; H04N5/4448; H04N2201/00; H04N2201/0077; H04N2201/0082; H04N2201/0084; H04N5/76; H04N5/907
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
111 words
A method to determine in a video frame grabber an optimal sampling delay of a sampling clock with respect to synchronisation signals corresponding to video signals, comprising the following steps: (a) generating the video signals having fast transients; (b) setting a sampling delay of said sampling clock with respect to said synchronisation signals; (c) sampling said video signals at a predetermined frequency of said sampling clock to digital image signals; (d) computing a grey score from said digital image signals; (e) repeating steps (b) to (d) for at least two different sampling delay settings; and (f) selecting as the optimal sampling delay the one that corresponds to the best grey score.
Claim 2
Independent Claim
111 words
A method to determine in a video frame grabber an optimal sampling delay of a sampling clock with respect to synchronisation signals corresponding to video signals, comprising the following steps: (a) generating the video signals having fast transients; (b) setting a sampling delay of said sampling clock with respect to said synchronisation signals; (c) sampling said video signals at a predetermined frequency of said sampling clock to digital image signals; (d) computing a grey score from said digital image signals; (e) repeating steps (b) to (d) for at least two different sampling delay settings; and (f) selecting as the optimal sampling delay the one that corresponds to the best grey score.
Claim 3
Dependent Claim
42 words
The method according to claim 1, further comprising the step of computing a second set of grey scores for a specific sampling delay setting as a weighted sum of grey scores corresponding to sampling delay settings closest said specific sampling delay setting.
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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) | 2001-07-06 | 2002-01-05 | 2002-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-07-06 | 2006-01-05 | 2006-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-07-06 | 2010-01-05 | 2010-07-07 | $7700.00 | Window Closed / Lapsed |