Patent EP0236943A2 successfully refreshed from Google Patents.
EP0236943A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus for combining video signals
Assignee: Grass Valley Group Inc
•
Filing: 1987-03-05
•
Granted: —
•
Expires: 2007-03-05
Abstract
Abstract A first shaped video signal V₁K₁ and a second shaped video signal V₂V₂, are combined so as to generate a third shaped video signal V₃ʹ given by V₃ʹ = V₁ K₁ [l - K₂(l - P₁₂)] + V₂K₂(l - K₁P₁₂) where P₁₂ is a priority signal. a key signal K₃ given by K₃ = l - (l - K₁)(l - K₂) is also generated. An output processor receives the shaped video signal V₃ʹ, the key signal K₃ and a matte signal M₃. In a first mode of operation, the output video signal V₃ʺ of the output processor is given by V₃ʹʹ = V₃ + M₃(l - K₃) and the key signal K₃ʹ that is generated by the output processor has a constant value, and in a second made of operation of the output processor the output video signal is given by V₃ʹʹ = V₃ʹ/K₃ and the key signal K₃ʹ is directly proportional to K₃.
Inventors
- 👤 Richard A. Jackson
- 👤 Kevin D. Windrem
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 07:07
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/222; H04N5/262; H04N5/272; H04N5/265; H04N5/275
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
66 words
Apparatus for combining a first shaped video signal V₁K₁ and a second shaped video signal V₂K₂, comprising means for generating a third shaped video signal V₃ʹ given by V₃ʹ = V₁ K₁ [l - K₂(l - P₁₂)] + V₂K₂(l - K₁P₁₂) where P₁₂ is a priority signal, and means for generating a key signal K₃ given by K₃ = l - (l - K₁)(l - K₂).
Claim 2
Dependent Claim
66 words
Apparatus for combining a first shaped video signal V₁K₁ and a second shaped video signal V₂K₂, comprising means for generating a third shaped video signal V₃ʹ given by V₃ʹ = V₁ K₁ [l - K₂(l - P₁₂)] + V₂K₂(l - K₁P₁₂) where P₁₂ is a priority signal, and means for generating a key signal K₃ given by K₃ = l - (l - K₁)(l - K₂).
Claim 3
Dependent Claim
59 words
Apparatus according to claim l, further comprising an output processor for receiving the shaped video signal V₃ʹ and the key signal K₃, said output processor being operative in a first mode to generate an output signal V₃ʺ given by V₃ʺ = V₃ʹ + A where A is independent of V₃ʹ, and a key signal K₃ʹ having a constant value.
Claim 4
Dependent Claim
43 words
Apparatus according to claim 2, wherein the output processor is operative in a second mode to provide an output signal V₃ʺ that is directly proportional to the signal V₃ʹ/K₃ and a key signal K₃ʹ that is directly proportional to the key signal K₃.
Claim 5
Dependent Claim
42 words
Apparatus according to claim 2, wherein the output processor has an input terminal for receiving a matte signal M₃ and is operative in the first mode to generate an output video signal V₃ʺ given by V₃ʺ = V₃ʹ + M₃(l - K₃).
Claim 6
Dependent Claim
60 words
A combiner system for combining a plurality of shaped video signals in accordance with asso ciated respective key signals and priority signals, comprising first and second apparatus according to claim l, with the third video signal and the third key signal of the first apparatus connected as the first video signal and the first key signal of the second apparatus.
Claim 7
Dependent Claim
85 words
A processing circuit for receiving a shaped video signal V₃ʹ and an associated key signal K₃ and providing output signals in response thereto, said processing circuit having at least a first mode of operation and comprising first means operative in the first mode of the processing circuit to generate an output video signal V₃ʺ given by V₃ʺ = V₃ʹ + A where A is independent of V₃ʹ, and second means operative in the first mode to generate an output key signal having a constant value.
Claim 8
Dependent Claim
85 words
A processing circuit for receiving a shaped video signal V₃ʹ and an associated key signal K₃ and providing output signals in response thereto, said processing circuit having at least a first mode of operation and comprising first means operative in the first mode of the processing circuit to generate an output video signal V₃ʺ given by V₃ʺ = V₃ʹ + A where A is independent of V₃ʹ, and second means operative in the first mode to generate an output key signal having a constant value.
Claim 9
Dependent Claim
67 words
A processing circuit according to claim 6, having a second mode of operation, and wherein the first means are operative in the second mode to generate an output video signal V₃ʺ given by V₃ʺ = C V₃ʹ/K₃ where C is a constant, and the second means are operative in the second mode to generate an output key signal that is directly proportional to the key signal K₃.
Claim 10
Dependent Claim
44 words
A processing circuit according to claim 6, wherein the output processor has an input terminal for receiving a matte signal M₃ and is operative in the first mode to generate an output video signal V₃ʺ given by V₃ʺ = V₃ʹ + M₃(l - K₃).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.