Movement detector for television signals

Details Movement detector for television signals Movement detector for television signals

1980-08-01

1982-12-14

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

340583, H04N 718

Patent

active

043640877

ABSTRACT:
A movement detector for television signals measures the difference between maximum and minimum values of the movement components of a picture difference signal over a chosen interval. A television signal at an input (12) is delayed in a picture delay (2), and the delayed and undelayed signals subtracted in a subtractor (1) to form a picture difference signal. This is rectified in rectifier (3) and smoothed in a filter (4). A maximum detector (6) and a minimum detector (7) are coupled to the filter output and are re-set at prescribed intervals. A subtractor (8) determines the difference between the output of detectors (6) and (7) and this is compared with a reference value in a comparator (9), the output of which is sampled and stored in a store (10).

REFERENCES:
patent: 3781468 (1973-12-01), Chomet et al.
patent: 3790706 (1974-02-01), Gubala et al.
patent: 4112463 (1978-09-01), Kamin
patent: 4148062 (1979-04-01), Kamin
patent: 4160998 (1979-07-01), Kamin
patent: 4236180 (1980-11-01), Cayzac
D. L. Pearson et al., "A Simple Motion Detector for Television Signals" 1-73, Journal of the SMPTE vol. 82, pp. 17-21.

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