System for separating luminance and chrominance signals from a c

Details System for separating luminance and chrominance signals from a c System for separating luminance and chrominance signals from a c

1992-07-24

1993-11-23

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 36, 358105, H04N 978

Patent

active

052649237

ABSTRACT:
A system for separating luminance and chrominance signals from a composite video signal, comprising frame and line comb filters for outputting frame and line difference signals of the video signal respectively, a first filter for extracting a chrominance signal from the video signal, a line correlation detector for detecting the line correlations based on the line difference signals, a chrominance signal level detector for detecting a level of the output of the first filter, a switch for selecting one of the outputs of the line comb filter and first filter, a moving level detector for detecting a moving level of the video signal based on the frame difference signal, a moving signal generator for generating a moving factor, a first operator for operating the output of the switch and the moving factor, a second operator for operating the output of the frame comb filter and a value (reference value minus moving factor), an adder for adding the outputs of the first and second operators, a second filter for filtering the output of the adder to extract a chrominance signal, a third filter for filtering the output of the adder to output the final chrominance signal, a delay element for delaying the video signal, and a subtracter for subtracting the second filter output from the delay element output to output the final luminance signal.

REFERENCES:
patent: 4617589 (1986-10-01), Weckenbrock
patent: 4994906 (1991-02-01), Moriwake
patent: 5047866 (1991-09-01), Watanabe
patent: 5155582 (1992-10-01), Tokoi
IDTV Receiver, Kiyouki Kawai et al, IEEE Transactions on Consumer Electronics, vol. CE-33, No. 3, Aug. 1987, pp. 181-191.

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