Television – Format conversion – Line doublers type
Patent
1993-03-19
1996-01-02
Metjahic, Safet
Television
Format conversion
Line doublers type
348629, 348452, H04N 701, H04N 5208
Patent
active
054813115
ABSTRACT:
For progressive scan conversion adjacent fields cannot be used to interpolate moving objects because motion blur will be introduced then. The most simple solution is to insert the average of the two adjacent lines for each missing line. A technique superior to vertical averaging represents the DIAG3 algorithm, where according to the found minimum gradient the orientation of the interpolation filter is chosen. But in case of high diagonal frequencies interpolation errors will occur. Therefore it is tested if the reconstructed pixel value exceeds or falls below the pixel values in the two adjacent lines of the input signal. If this happens, instead of one of the detected diagonal directions the vertical direction is taken, it.e. a vertical averaging is carried out.
REFERENCES:
patent: 4831435 (1989-05-01), Song et al.
patent: 4941045 (1990-07-01), Birch
patent: 4985764 (1991-01-01), Sato
patent: 5032899 (1991-07-01), Sato
patent: 5093721 (1992-03-01), Rabii
patent: 5339109 (1994-08-01), Hong
Signal Processing of HDTV, Proceedings of the Second International Workshop, 29 Aug. 1989 T. Doyle, pp. 421-430.
Coalter Richard G.
Emanuel Peter M.
Metjahic Safet
Thomson Consumer Electronics S.A.
Tripoli Joseph S.
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