Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1996-08-21
1999-11-02
Harvey, David E.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
H04N 5213
Patent
active
059780479
ABSTRACT:
A video signal 21 is input to a motion-compensated median filter to produce a preliminary blemish-concealed signal 23. The preliminary signal and the original input signal are passed via appropriate delays to respective inputs of a selector switch 31 and to a side chain circuit. The selector switch is controlled by the side chain circuit output and the selector switch output 22 forms a final blemish-concealed video signal. In the side chain circuit a difference signal C is generated to indicate differences between the input signal and the preliminary signal. The difference signal C is processed in two parallel circuit branches to remove differences having gently-sloping edges and differences corresponding to similar-sized differences in similar areas of adjacent frames, which are likely to be motion artifacts. The modified difference signals from each circuit branch are combined in an AND gate 95 to generate a control signal, which controls the selector switch 22 to output the original input signal except in image areas where the side chain processing indicates that a blemish is present.
REFERENCES:
patent: 4590520 (1986-05-01), Frame et al.
R. Storey, "Electronic detection and concealment of film dirt," BBC Research Dept., Report BBC RD 1985/4, pp. 1-21 (London, England, Feb. 1985).
Childs, "BBC Research Department Report", RD 1985/3, pp. 15-24 (Feb. 1985) (GB XP002062676).
Mead, et al. "Scratch and Dirt Concealment Within a CCD-Based Telecine", pp. 246-250, International Broadcasting Convention, Brighton (GB) (Sep. 21, 1984) (XP002062677).
Derwent abstract of GB-2 139 039, Storey/BBC, granted Sep. 3, 1986.
Derwent abstract of GB-2 206,706, Borer/BBC, granted Jan. 9, 1991.
Harvey David E.
Neuner George W.
The British Broadcasting Corporation
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