Method and circuit for detecting and concealing video signal err

Details Method and circuit for detecting and concealing video signal err Method and circuit for detecting and concealing video signal err

1995-09-11

1996-12-31

Lee, Micheal H.

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348 96, 382275, H04N 521

Patent

active

055898874

ABSTRACT:
In a method and a circuit for detecting and concealing video signal errors caused by vertically extending film scratches during television film scanning, an error signal is derived at error locations generated by disturbed pixels and is used in the form of a control signal for concealing errors in the video signal. The error signal is generated only when an adjustable, locally bounded scratch width in the horizontal direction is not exceeded and when each scratch essentially extends vertically, and when the scratch length substantially corresponds to the film frame height. Finally, the disturbed locations in the video signal are replaced by the corresponding low-pass-filtered video signal with the aid of the error signal.

REFERENCES:
patent: 4941186 (1990-07-01), Massmann et al.
patent: 5097521 (1992-03-01), Massmann

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