US5280337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Depth-based video combining
Assignee: Grass Valley USA LLC
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Filing: 1992-10-13
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Granted: 1994-01-18
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Expires: 2012-10-13
Abstract
Abstract A depth-based video combiner that combines two video signals to produce a combined video signal as a function of respective key signals and a priority signal derived from respective depth coefficient signals also combines the respective depth coefficient signals as a function of the respective key signals and the priority signal to produce a combined depth coefficient for the combined video signal to provide smooth depth transitions at intersecting edges between the two video signals. A mix coefficient for the depth coefficient signals is generated from the respective key signals and the priority signal. The mix coefficient signal is used to combine the respective depth coefficient signals to produce the combined depth coefficient signal.
Inventors
- 👤 Philip A. DesJardins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:25
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/222; H04N5/262; H04N5/272
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
97 words
In a depth-based video combiner that combines a first video signal with a second video signal as a function of respective key and depth coefficient signals to produce a combined video signal, an apparatus for determining a combined depth coefficient signal for the combined video signal comprising: means for determining as a function of the respective key signals and a priority signal derived from the respective depth coefficient signals a mix coefficient signal; and means for combining the respective depth coefficient signals as a function of the mix coefficient signal to produce the combined depth coefficient signal.
Claim 2
Dependent Claim
97 words
In a depth-based video combiner that combines a first video signal with a second video signal as a function of respective key and depth coefficient signals to produce a combined video signal, an apparatus for determining a combined depth coefficient signal for the combined video signal comprising: means for determining as a function of the respective key signals and a priority signal derived from the respective depth coefficient signals a mix coefficient signal; and means for combining the respective depth coefficient signals as a function of the mix coefficient signal to produce the combined depth coefficient signal.
Claim 3
Dependent Claim
74 words
A depth-based video combiner as recited in claim 1 wherein the combining means comprises a mixer having the respective depth coefficient signals as inputs and the mix coefficient signal as a control signal to produce the combined depth coefficient signal according to the function: W.sub.C =M*W.sub.A +(1-M)*W.sub.B where W C is the combined depth coefficient signal, W A and W B are the respective depth coefficient signals and M is the mix coefficient signal.
Claim 4
Dependent Claim
51 words
A depth-based video combiner as recited in claim 2 wherein the determining means comprises: means for generating a pair of intermediate mix coefficients as a function of the respective key signals; and means for combining the intermediate mix coefficients under control of the priority signal to produce the mix coefficient signal.
Claim 5
Dependent Claim
93 words
A depth-based video combiner as recited in claim 3 wherein the generating means comprises: means for combining one of the key signals with unity under control of the other of the key signals to produce a first one of the intermediate mix coefficient signals; means for combining the other of the key signals with unity under control of the one of the key signals to produce a preliminary mix coefficient signal; and means for subtracting the preliminary mix coefficient signal from unity to produce a second one of the intermediate mix coefficient signals.
Claim 6
Dependent Claim
51 words
A depth-based video combiner as recited in claim 1 wherein the determining means comprises: means for generating a pair of intermediate mix coefficients as a function of the respective key signals; and means for combining the intermediate mix coefficients under control of the priority signal to produce the mix coefficient signal.
Claim 7
Dependent Claim
93 words
A depth-based video combiner as recited in claim 5 wherein the generating means comprises: means for combining one of the key signals with unity under control of the other of the key signals to produce a first one of the intermediate mix coefficient signals; means for combining the other of the key signals with unity under control of the one of the key signals to produce a preliminary mix coefficient signal; and means for subtracting the preliminary mix coefficient signal from unity to produce a second one of the intermediate mix coefficient signals.
Claim 8
Dependent Claim
77 words
A depth-based video combiner as recited in claim 6 wherein the depth coefficient signals combining means comprises a mixer having the respective depth coefficient signals as inputs and the mix coefficient signal as a control signal to produce the combined depth coefficient signal according to the function: W.sub.C =M*W.sub.A +(1-M)*W.sub.B where W C is the combined depth coefficient signal, W A and W B are the respective depth coefficient signals and M is the mix coefficient signal.
References Cited (Backward Citations)
EP0199489A1
Cited
US4851912A
Cited
EP0260998A2
Cited
US4875097A
Cited
JPS6462483A
Cited
US5121210A
Cited
US5077608A
Cited
GB2252009A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-01-17 | 1997-07-19 | 1998-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-17 | 2001-07-19 | 2002-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-17 | 2005-07-19 | 2006-01-18 | $7700.00 | Window Closed / Lapsed |