Circuit arrangement for improving the quality of a video signal

Details Circuit arrangement for improving the quality of a video signal Circuit arrangement for improving the quality of a video signal

1994-05-27

1995-12-26

Kostak, Victor R.

Television

Image signal processing circuitry specific to television

Transition or edge sharpeners

348623, H04N 520

Patent

active

054792150

ABSTRACT:
A circuit arrangement for improving the quality of video signals read out from a storage medium by isolating and processing a radio-frequency component which is added to a delayed video signal. An improvement can be achieved in particular in the signal details without any noise amplification effects and at the same time providing a natural picture. The circuit arrangement includes a synchronizing pulse separation stage for separating the radio-frequency component from the synchronizing pulses, a coring stage for suppressing signal components with signal values lying below a first threshold value and a controllable amplification stage, which influences the instantaneous signal value with a characteristic curve which is dependent on the signal value in a main signal branch and provides an increasing relative boosting of the radio-frequency component for greater signal values in the main signal branch.

REFERENCES:
patent: 3715477 (1973-02-01), Olson et al.
patent: 4414564 (1983-11-01), Hitchcock
patent: 4536796 (1985-08-01), Harlan
patent: 4962419 (1990-10-01), Hibbard et al.
patent: 4962426 (1990-10-01), Naoi et al.
Lebowsky, "Hierarchical Image Quality Improvement Using Multiprocessor Systems", Television and Cinema Technology, pp. 155-164 (1992). no translation.

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