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US 5,333,054 AGranted
Apparatus for reducing noise in a video signal by processing a luminance and chrominance component
AssigneeKabushiki Kaisha Toshiba
InventorsSeiichi Tanaka, Masahiko Mawatari
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Abstract
A video signal processing apparatus capable of improving a signal to noise ratio of a video signal by providing for a first luminance/chrominance separation circuit for still pictures and a second luminance/chrominance separation circuit for moving pictures. Color disturbances on the screen can be avoided by switching between a parallel configuration and a serial configuration of the first and second separation circuits without generating differences in signal delay times.
Claims9
A video signal processing apparatus comprising:
- means for receiving a composite video signal;
- first separation means for separating a first luminance signal and a first chrominance signal in response to a correlation among n frames (n is a positive integer) of the composite video signal;
- second separation means for separating a second luminance signal and a second chrominance signal in response to an in-frame correlation of the composite video signal;
- means for detecting a motion of the composite video signal in response to a non-correlation among n frames (m is a positive integer) of the composite video signal, and to provide a motion detection signal therefrom;
- first mixing means for mixing the first and second luminance signals at a mixing ratio responsive to said motion detection signal so as to provide a third luminance signal therefrom;
- second mixing means for mixing said first and second chrominance signals at a mixing ratio responsive to the motion detection signal so as to provide a third chrominance signal therefrom;
- means for reducing noise in the second luminance signal and the second chrominance signal in response to the n-frame correlation, and outputting signals as a fourth luminance signal and a fourth chrominance signal;
- and
- a selection means for selectively outputting the third luminance signal and the third chrominance signal or the fourth luminance signal and the fourth chrominance signal.
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Dependencies are inferred from the claim text.