| 摘要 |
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 c.
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