Television – Image signal processing circuitry specific to television – Transition or edge sharpeners
Patent
1997-06-06
1999-04-27
Faile, Andrew I.
Television
Image signal processing circuitry specific to television
Transition or edge sharpeners
348630, 348631, 348663, 382266, 382199, 358463, 358582, H04N 5208
Patent
active
058984640
ABSTRACT:
A method which can be used to enhance an outline of an image displayed in an image display apparatus such as a television receiver, and a circuit performing the method. The circuit includes a peaking signal generation circuit which generates a first peaking signal and a second peaking signal corresponding to an amplitude transition of a video signal. A first peaked video signal generation circuit generates a first peaked video signal by adding the first peaking signal to the video signal. A control signal generation circuit generates a first control signal based on a result of comparing a first-order differential signal developed by differentiating the video signal with a reference signal, and a second control signal by delaying the first control signal for the predetermined period. A first selection circuit selects either the video signal or the first peaked videos signal according to the first control signal. A second peaked video signal generation circuit generates a second peaked video signal by adding the second peaking signal to the first selected signal. And, a second selection circuit selects either the first selected signal or the second peaked signal to develop a second selected signal, and outputs the second selected signal as an enhanced video signal. Therefore, the circuit can enhance an outline of an image formed by a video signal without modifying an amplitude transition time of the video signal and introducing the preshoot and overshoot into the video signal.
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Brown Reuben M.
Daewoo Electronics Co. Ltd.
Faile Andrew I.
LandOfFree
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