Detecting circuit of a video motion signal

Details Detecting circuit of a video motion signal Detecting circuit of a video motion signal

1991-03-27

1992-07-21

Peng, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 36, H04N 718

Patent

active

051327902

ABSTRACT:
In a detecting circuit of a video motion signal, luminance signal components of a video signal and a one-frame-delayed video signal of the video signal are respectively extracted by corresponding comb shaped filters, then the luminance signal component of the video signal is subtracted by that of the one-frame-delayed video signal to generate a luminance frame difference signal. If either it is detected that the video signal includes a color signal component by a color signal component detecting circuit, or it is detected that a luminance line difference signal has a difference component by a luminance vertical difference component detecting circuit, a signal component in the frequency band in which the color signal component thus detected by the color signal component detecting circuit is removed from the luminance frame difference signal by a filter circuit, so that the luminance frame difference signal includes no color signal component which may cause a dot crawling in a still video picture, without causing a cross color or a double picture.

REFERENCES:
patent: 4616254 (1986-10-01), Harwood et al.
patent: 4809060 (1989-02-01), Saeki
patent: 4922331 (1990-05-01), Ezaki
patent: 4924305 (1990-05-01), Nakagawa et al.
patent: 4930012 (1990-05-01), Fujita
patent: 4972259 (1990-11-01), Motoe et al.
patent: 5032914 (1991-07-01), Fujita

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