| 摘要 |
An improved self keyer generates a pre-emphasized fill video signal that compensates for the multiplication of the fill video signal with a self key signal derived (12) from the fill video signal, i.e., reduces the black content at the transition. The fill video signal is multiplied (16, 20) by twice the complement of the self key signal and then added (22) to the fill video signal to produce the pre-emphasized fill video signal. The pre-emphasized fill video signal is then combined (10) with a background video signal under control of the self key signal.
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