Method of inserting a background picture signal into parts of a

Details Method of inserting a background picture signal into parts of a Method of inserting a background picture signal into parts of a

1996-06-10

1998-01-13

Hsia, Sherrie

Television

Image signal processing circuitry specific to television

Special effects

348592, H04N 975

Patent

active

057084793

ABSTRACT:
In a method of inserting a background picture signal into key color-characterized parts of a foreground picture signal, the selectivity, i.e., the boundary between its foreground colors and the transition or mixed colors degenerated by the key color should be changeable within a frame period by means of masking. This provides the possibility of differently keying equal colors of different origin occurring in a picture--as a pure foreground color, on the one hand, and as a mixed color, on the other hand--namely, by dynamically switching the selectivity within a frame period by means of the chroma angle .alpha..sub.c.

REFERENCES:
patent: 5444496 (1995-08-01), Gehrmann
patent: 5455633 (1995-10-01), Gehrmann

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