Apparatus and method for separating luminance and color signals

Details Apparatus and method for separating luminance and color signals Apparatus and method for separating luminance and color signals

1994-08-03

1996-06-25

Groody, James J.

Television

Image signal processing circuitry specific to television

Chrominance-luminance signal separation

348664, 348665, 348659, H04N 977, H04N 978

Patent

active

055304869

ABSTRACT:
An apparatus and a method for separating luminance and color signals from an input video signal. The apparatus comprises a color signal detector for filtering the input video signal at horizontal, vertical and two-dimensional regions to detect respective color signals therefrom, a control signal generator for discriminating horizontal, vertical and diagonal variations of the input video signal and generating a plurality of control signals in accordance with the discriminated result so that one of the color signals from the color signal detector can be selected, an output selection unit for selecting one of the color signals from the color signal detector in response to the control signals from the control signal generator, a delay matching unit for delaying the input video signal to match its timing with that of the color signal from the output selection unit, and a subtracter for subtracting the color signal from the output selection unit from an output signal from the delay matching unit to output the luminance signal. The apparatus further comprises a post-processor for maintaining the control signals from the control signal generator consistently and outputting the resultant final control signals to the output selection unit.

REFERENCES:
patent: 5206715 (1993-04-01), Jung
patent: 5264923 (1993-11-01), Bhang
patent: 5373328 (1994-12-01), Hong

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