Television – Format conversion – Changing number of lines for standard conversion
Patent
1993-11-19
1995-01-31
Kostak, Victor R.
Television
Format conversion
Changing number of lines for standard conversion
348448, H04N 701
Patent
active
053862376
ABSTRACT:
Extra lines (Yout) for display be progressive scanning are obtained by adaptive interpolation from the original (interlaced) lines. The original lines are left untouched. Each interpolated pixel is the result of a soft switch (456,461,462) between pure interframe interpolation (452), which is the more suitable for areas without moving detail, and interpolation (451) using the Diag-3W algorithm, which is the more suitable for moving areas. The soft switch coefficient (S) is calculated using a normalized comparison between two estimates (E.sub.v,E.sub.t) of the likely error resulting from each of the two kinds of interpolation. To limit the occurrence of wrong decisions due to noise or to certain structures in the picture, the decision is spread horizontally, vertically and temporally, but only over a very small area so that the decision remains local to the pixel (X) being interpolated.
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Coalter Richard G.
Emanuel Peter M.
Kostak Victor R.
Thomson Consumer Electronics S.A.
Tripoli Joseph S.
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