US5777686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 17:02
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.
References Cited (Backward Citations)
US4367337A
Cited
US4481542A
Cited
US4713690A
Cited
US4814875A
Cited
JPS62183274A
Cited
US4963969A
Cited
EP0263393A2
Cited
US4743958A
Cited
US4831378A
Cited
JPS63180278A
Cited
EP0316946A2
Cited
US4974069A
Cited
US4942468A
Cited
US4872054A
Cited
US5493418A
Cited
EP0462784A2
Cited
US5121117A
Cited
JPH0514731A
Cited
JPH0537850A
Cited
EP0528548A2
Cited
US5229853A
Cited
EP0544245A1
Cited
EP0577841A1
Cited
US5396295A
Cited
JPH06177761A
Cited
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 |