Mix/effects switch arrangement and mix/effects switching system
Video background generation system Patent #: 4420770
ApplicationNo. 07/221005 filed on 07/18/1988
US Classes:348/585, Including priority key348/586, Foreground/background insertion348/588Multiple distinct images (e.g., splitscreen)
ExaminersPrimary: Chin, Tommy P.
Attorney, Agent or Firm
International 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.