Apparatus for combining video signals
Patent 4851912 Issued on July 25, 1989. Estimated Expiration Date: 
July 18, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 18, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3673324 Mix/effects switch arrangement and mix/effects switching system Video background generation system Patent #: 4420770 InventorsAssigneeApplicationNo. 07/221005 filed on 07/18/1988US Classes:348/585, Including priority key348/586, Foreground/background insertion348/588Multiple distinct images (e.g., splitscreen)ExaminersPrimary: Chin, Tommy P.Attorney, Agent or FirmInternational ClassH04N 5/265 (20060101)AbstractA first shaped video signal V1 K1 and a second shaped video signal V2 V2, are combined so as to generate a third shaped video signal V3 ' given bywhere P12 is a priority signal. A key signal K3 given byis also generated. An output processor receives the shaped video signal V3 ', the key signal K3 and a matte signal M3. In a first mode of operation, the output video signal V3 " of the output processor is given byand the key signal K3 ' that is generated by the output processor has a constant value, and in a second mode of operation of the output processor the output video signal is given byand the key signal K3 ' is directly proportional to K3.Other References
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