Television – Image signal processing circuitry specific to television – Transition or edge sharpeners
Patent
1993-08-02
1995-05-09
Groody, James J.
Television
Image signal processing circuitry specific to television
Transition or edge sharpeners
348627, H04N 5208
Patent
active
054144736
ABSTRACT:
An apparatus and a method for enhancing a transient edge of a video signal. The enhancement apparatus comprises a synchronization region detection circuit for detecting a synchronization region from a composite video signal inputted therein and outputting the resultant synchronization region detection signal, a coring circuit for removing upper and lower level noise components of the synchronization region detection signal, a transient width detection circuit for detecting a transient width of a synchronization signal from the noise-removed synchronization region detection signal, an enhancement circuit for varying a frequency band of the video signal to be enhanced, according to, the detected transient width of the synchronization signal from the transient width detection circuit and enhancing the transient edge of the video signal of the varied frequency band, an attenuator for adjusting an enhancement level of the enhanced video signal from the enhancement circuit, a delay matching unit for delaying the inputted video signal by a predetermined time period to match it with an output signal from the attenuator, and an adder for adding an output signal from the delay matching unit to the output signal from the attenuator and outputting the resultant enhanced video signal.
REFERENCES:
patent: 4159481 (1979-06-01), Mikado
patent: 4962427 (1990-10-01), Lunn et al.
patent: 5150214 (1992-09-01), Shin et al.
Goldstar Co. Ltd.
Groody James J.
Lee Michael H.
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