Television – Image signal processing circuitry specific to television – Transition or edge sharpeners
Patent
1995-09-07
1997-12-16
Burgess, Glenton B.
Television
Image signal processing circuitry specific to television
Transition or edge sharpeners
348627, 348606, H04N 5208
Patent
active
056991266
ABSTRACT:
A picture definition apparatus for video display equipment comprising a first filtering circuit for extracting a high-frequency component from an input video signal, an amplifier for amplifying an output signal from the first filtering circuit, a first delay circuit for delaying the input video signal to match it with an output signal from the amplifier, and an adder for adding an output signal from the first delay circuit to the output signal from the amplifier. The picture definition apparatus further comprises a second filtering circuit for extracting maximum and minimum values from an output signal from the first delay circuit, a second delay circuit for delaying an output signal from the adder to match it with the maximum and minimum values from the second filtering circuit, a first comparison circuit for comparing an output signal from the second delay circuit with the minimum value from the second filtering circuit, a second comparison circuit for comparing the output signal from the second delay circuit with the maximum value from the second filtering circuit, and an output selector for selectively outputting the output signal from the second delay circuit and the maximum and minimum values from the second filtering circuit in response to output signals from the first and second comparison circuits.
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Burgess Glenton B.
Grant Chris
LG Electronics Inc.
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