Key signal waveform shaping apparatus

Details Key signal waveform shaping apparatus Key signal waveform shaping apparatus

1995-12-19

1998-03-31

Chin, Tommy P.

Television

Image signal processing circuitry specific to television

Special effects

348597, H04N 974, H04N 975

Patent

active

057344388

ABSTRACT:
In a key signal waveform shaping apparatus which includes an adder 1 for supplying a key source signal KS with a gain of a predetermined slice level, a multiplier 2 for extending a signal offset by the adder 1 by multiplication of a gain, and a first limiter circuit 3 for converting the signal extended by the multiplier 2 by cutting an upper limit value and lower limit value of the extended signal. A limit value generating circuit generates an upper limit value and lower limit value from the signal offset by the adder 1. The key signal K is obtained by further limiting the output of the first limiter circuit 3 by the upper limit value and the lower limit value. The present invention provides a key signal waveform shaping apparatus in which an error of an edge position of a key signal can be removed and in which the quality of a synthesized picture can be improved.

REFERENCES:
patent: 4930004 (1990-05-01), Yamamoto et al.
patent: 4947255 (1990-08-01), Jackson et al.
patent: 4967277 (1990-10-01), Chaplin
patent: 4970595 (1990-11-01), Bloomfield
patent: 5051828 (1991-09-01), Chaplin
patent: 5146315 (1992-09-01), Muller
patent: 5146334 (1992-09-01), Fukatsu et al.
patent: 5313304 (1994-05-01), Chaplin
patent: 5369443 (1994-11-01), Woodham
patent: 5416529 (1995-05-01), Lake

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