Apparatus for combining video signals

Details Apparatus for combining video signals Apparatus for combining video signals

H - Electricity

04

N

350/53

H04N 5/265 (2006.01) H04N 5/272 (2006.01)

Patent

CA 1309768

Abstract A first shaped video signal V1K1 and a second shaped video signal V2K2, are combined so as to generate a third shaped video signal V3' given by V3' = V1K1 [1 - K2(1 - P12)] + V2K2(1 - K1P12) where P12 is a priority signal. A key signal K3 given by K3 = 1 - (1 - K1)(1 - K2) is 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 by V3" = V3 + M3(1 - K3) and 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 by V3" = V3'/K3 and the key signal K3' is directly proportional to K3.

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