| 摘要 |
A method and apparatus to improve the control signal Ec(1) used in a video image compositing system so that the adjustment to achieve an Ec of just zero for green objects and flesh tones, does not simultaneously reduce Ec in grey scale subjects and cause print-through. The invention also reproduces a wide range of blue colors from pale blue to bright blue in the presence of a blue backing without raising a matte density control (11) and without raising noise level. The invention also provides a second control signal, Ek(4), that eliminates backing color spill from blond and brown hair, without affecting bright foreground white tones. The invention also generates a SHADOW CLEAN-UP signal (5) that eliminates foreground shadows, while preserving most of the foreground detail information.
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