Television – Image signal processing circuitry specific to television – Transition or edge sharpeners
Patent
1992-10-22
1994-03-29
Powell, Mark R.
Television
Image signal processing circuitry specific to television
Transition or edge sharpeners
348571, H04N 964, H04N 5208, H04N 514
Patent
active
052989810
ABSTRACT:
A color video camera includes circuitry which generates a peaking signal that is applied to each of the color signals to enhance high-frequency components of the video signal relative to low-frequency components. The circuitry adds high-frequency components from the green video signal, as the peaking signal, at instants when the amplitudes of the green and red color signals are approximately equal. If there is a significant difference between the amplitudes of the red and green video signals, however, a combination of the high frequency components of both of these signals is used as the peaking signal. In one exemplary embodiment of the invention, the peaking signal includes in-band horizontal and vertical contour signals and out-of-band aperture correction signal.
REFERENCES:
patent: 3681520 (1972-08-01), Schneider
patent: 3732360 (1973-05-01), Breimer et al.
patent: 4209801 (1980-06-01), Dischert et al.
patent: 4748500 (1988-05-01), Lacoste et al.
patent: 4823190 (1989-04-01), Yamamoto
Dischert Lee R.
Topper Robert J.
Miller John W.
Panasonic Technologies Inc.
Powell Mark R.
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