Patent US4200890A successfully refreshed from Google Patents.
US4200890A
Expired / Lapsed
US
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Digital video effects system employing a chroma-key tracking technique
Assignee: NEC Corp
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Filing: 1978-07-07
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Granted: 1980-04-29
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Expires: 1998-07-07
Abstract
Abstract A chroma-key tracking system for electronically compressing a television picture to predetermined dimensions and for moving the compressed picture to a specified area on the television screen where the compressed picture is inserted into a second picture present on the screen. The chroma-key tracking system advantageously operates in the presence of electrical noise associated with the chroma-key tracking signal.
Inventors
- 👤 Masao Inaba
- 👤 Kazuo Kashigi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:55
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/74; H04N9/75; H04N5/00; H04N5/222; H04N5/262; H04N5/272; H04N5/275
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
166 words
A tracking system for producing special effects on a television picture, picture comprised of a first picture and a second picture inserted into said first picture, said first and second pictures being represented by first and second video signals respectively, said system comprising: means for producing a key signal representing a key frame to be positioned on said first picture; means responsive to said key signal for producing a position signal representing a position of a circumscribed frame of said key frame; means responsive to said position signal for producing an imaginary-frame position signal representing an imaginary frame greater than said key frame; means responsive to said second video signal and said imaginary-frame position signal for producing a compressed second video signal representing a compressed second picture, said compressed second picture being identical in size to said imaginary frame; and means responsive to said key signal for selectively combining said first video signal and said compressed second video signal, whereby to said special effects are produced.
Claim 2
Dependent Claim
166 words
A tracking system for producing special effects on a television picture, picture comprised of a first picture and a second picture inserted into said first picture, said first and second pictures being represented by first and second video signals respectively, said system comprising: means for producing a key signal representing a key frame to be positioned on said first picture; means responsive to said key signal for producing a position signal representing a position of a circumscribed frame of said key frame; means responsive to said position signal for producing an imaginary-frame position signal representing an imaginary frame greater than said key frame; means responsive to said second video signal and said imaginary-frame position signal for producing a compressed second video signal representing a compressed second picture, said compressed second picture being identical in size to said imaginary frame; and means responsive to said key signal for selectively combining said first video signal and said compressed second video signal, whereby to said special effects are produced.
Claim 3
Dependent Claim
25 words
A tracking system in accordance with claim 1 wherein said position signal producing means includes means for removing electrical noise signals from said key signal.
Claim 4
Dependent Claim
48 words
A tracking system in accordance with claim 2 wherein said frame position signal includes two horizontal position signal values and two vertical position signal values, the tracking system further including means for detecting minimum and maximum horizontal position signal values and minimum and maximum vertical position signal values.
Claim 5
Dependent Claim
63 words
A tracking system in accordance with claim 3 wherein there is further included means for subtracting said minimum horizontal position signal value from said maximum horizontal position value and said minimum vertical position signal value from said maximum vertical position signal value, said horizontal difference being representative of said circumscribed frame length and said vertical difference being representative of said circumscribed frame height.
Claim 6
Dependent Claim
25 words
A tracking system in accordance with claim 4 further including means responsive to said horizontal and vertical differences for generating said imaginary frame position signal.
References Cited (Backward Citations)
US3437873A
Cited
US3654386A
Cited
US3787619A
Cited
US4063280A
Cited
US4103830A
Cited
US4028727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-29 | 1983-10-29 | 1984-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-29 | 1987-10-29 | 1988-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-29 | 1991-10-29 | 1992-04-29 | $7700.00 | Window Closed / Lapsed |