System for reducing visible noise in television images

Details System for reducing visible noise in television images System for reducing visible noise in television images

1980-08-11

1982-09-28

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 521

Patent

active

043521266

ABSTRACT:
A motion detector system reduces visible noise in television image signals by use of a numerical time filter. A sample memory is coupled to the output of the time filter. In the time filter, the sample of the images to be treated is combined with a corresponding and preceding sample delivered by the sample memory. A decision circuit determines whether the combination signal has a parameter of the time filter. A subtraction circuit has a first input coupled to receive the image sample which is to be treated and a second input coupled to receive the corresponding sample delivered by the sample memory. A low-pass filter has parallel inputs for receiving samples delivered by the subtracting circuit. A sign output is derived from an exclusive OR circuit coupled to a low-pass filter and a band-pass filter. A polarity reversal circuit responds to the two filters under control of the OR circuit for executing a polarity reversal when the values of the inputs of the exclusive OR circuit are different, depending on a threshold-type decision circuit.

REFERENCES:
patent: 4242704 (1980-12-01), Ito et al.
Connor et al., "A Frame-to-Frame Picturephone.RTM. Coder For Signals Containing Differential Quantizing Noise", Bell System Technical Journal, vol, 52, No. 1, Jan. 1973, pp. 35-51.

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