US4672431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contour correction system when one color signal is low
Assignee: Harris Corp
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Filing: 1986-09-05
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Granted: 1987-06-09
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Expires: 2006-09-05
Abstract
Abstract The contour correction system herein for a TV camera system generates contour correction signals from the green and red video signals. The red contour signal is selectively added to the green contour signal in such a manner as to not accentuate errors in misregistration of the video signals.
Inventors
- 👤 William J. Cosgrove
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:23
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/646; H04N23/00; H04N23/10; H04N23/13
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
120 words
A contour correction system for a television system having means for providing at least first and second video color signals, said correction system comprising: means for deriving first and second contour signals from said first and second video color signals, respectively; means for always combining said first contour signal with said color signals to enhance picture sharpness at color transitions thereof; means for selectively combining said second contour signal with said color signals only when said first color signal is below a predetermined level, said selective combining means includes gating means controlled in dependence upon said first color signal for passing said second contour signal as a gated contour signal when said first color signal is below said predetermined level
Claim 2
Dependent Claim
120 words
A contour correction system for a television system having means for providing at least first and second video color signals, said correction system comprising: means for deriving first and second contour signals from said first and second video color signals, respectively; means for always combining said first contour signal with said color signals to enhance picture sharpness at color transitions thereof; means for selectively combining said second contour signal with said color signals only when said first color signal is below a predetermined level, said selective combining means includes gating means controlled in dependence upon said first color signal for passing said second contour signal as a gated contour signal when said first color signal is below said predetermined level
Claim 3
Dependent Claim
32 words
A contour correction system as set forth in claim 1, including summing means for receiving and summing said first contour signal and said gated contour signal to provide a composite contour signal.
Claim 4
Dependent Claim
29 words
A contour correction system as set forth in claim 2 wherein said combining means is also responsive to said composite contour signal for combining it with said color signal.
Claim 5
Dependent Claim
27 words
A contour correction system as set forth in claim 1 including means for deriving a gating signal from said first color signal for controlling said gating means.
Claim 6
Dependent Claim
47 words
A contour correction system as set forth in claim 4 wherein said gating signal deriving means includes means for delaying said first color signal by a time delay T so that said gating signal is delayed relative to said first color signal by a time delay T.
Claim 7
Dependent Claim
33 words
A contour correction system as set forth in claim 5 wherein each said contour signal deriving means includes time delay means such that each contour signal has a time duration of 2 T.
Claim 8
Dependent Claim
52 words
A contour correction system as set forth in claim 6 wherein said gating means normally passes said second contour signal and blocks said second contour signal for a time duration corresponding with said gating signal, and means for applying said gating signal to said gating means for blocking said second contour signal.
Claim 9
Dependent Claim
34 words
A contour correction system as set forth in claim 7 wherein said signal applying means includes level detector means for applying said gating signal only when the first color signal exceeds a predetermined value.
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) | 1990-06-08 | 1990-12-08 | 1991-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-08 | 1994-12-08 | 1995-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-08 | 1998-12-08 | 1999-06-09 | $7700.00 | Window Closed / Lapsed |