Alias detection and avoidance process used in the processing of

Details Alias detection and avoidance process used in the processing of Alias detection and avoidance process used in the processing of

1995-01-12

1997-04-22

Harvey, David E.

Television

Image signal processing circuitry specific to television

Special effects

348590, H04N 5265

Patent

active

056233175

ABSTRACT:
A method and apparatus for combining video signals with key signals whilst maintaining the integrity of the video signal and minimizing the effect of alias components. An analyser detects whether there are any high frequency components which would otherwise cause alias components. If such high frequency components are present, then low-pass filtering occurs. If such high frequency components are not present, then no unnecessary filtering occurs so as to maintain the absolute integrity of the video signal.

REFERENCES:
patent: 4979022 (1990-12-01), Snashall et al.
patent: 5181100 (1993-01-01), Hodgson
Sandbank C.P. "Digital Television" pp. IV-XI and 287-311, 1990 John Wiley & Sons Ltd.

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