Television – Image signal processing circuitry specific to television – Transition or edge sharpeners
Patent
1997-07-07
1999-08-10
Peng, John K.
Television
Image signal processing circuitry specific to television
Transition or edge sharpeners
348627, 348631, 348607, 348252, 382266, 382263, 358447, H04N 5208, H04N 521, H04N 5213
Patent
active
059366826
ABSTRACT:
A circuit for enhancing chrominance transitions in a received chrominance video signal comprises a linear-phase digital filter supplied with an input stream of discrete chromatic image elements. The filter also has a high-pass transfer characteristic in a region of the frequency spectrum corresponding to an upper limit of a transmitted chrominance signal bandwidth for enhancing high-frequency components of the received chrominance signal. The circuit additionally includes non-linear digital post-processing circuitry which accepts as input an output of the filter and the input stream of discrete chromatic image elements. The non-linear post-processing circuitry acts on the output of the filter to eliminate distortions introduced in the received chrominance signal by the filter. The post-processing circuitry then detects if the received chrominance signal contains a transition pattern corresponding to predetermined patterns. If the chrominance signal matches one of the predetermined patterns, the filter is bypassed and the output of the circuit is equal to the received chrominance signal.
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D'Alto Viviana
Mancuso Massimo
Thomas Joseph
Carlson David V.
Desir Jean W.
Peng John K.
Ross Kevin S.
STMicroelectronics S.r.l.
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