Scan conversion apparatus with improved vertical resolution and

Details Scan conversion apparatus with improved vertical resolution and Scan conversion apparatus with improved vertical resolution and

1996-06-28

1998-10-13

Lee, Michael

Television

Format conversion

Progressive to interlace

348447, 348910, H04N 701

Patent

active

058220089

ABSTRACT:
A video scan converter has a deflickering circuit that attenuates spatial frequency components that combine high vertical spatial frequency with low horizontal spatial frequency. The resulting signal is converted from progressive scanning to interlaced scanning by appropriate selection of even and odd horizontal scanning lines. The deflickering circuit may also expand a selected part of the video signal by vertical interpolation, followed by vertical low-pass filtering, in which case a separate horizontal interpolating circuit expands the selected part horizontally, preferably after progressive-to-interlaced scan conversion.

REFERENCES:
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patent: 4673978 (1987-06-01), Dischert et al.
patent: 4677483 (1987-06-01), Dischert et al.
patent: 5136385 (1992-08-01), Campbell
patent: 5276515 (1994-01-01), Katsumata et al.
patent: 5283651 (1994-02-01), Ishizuka
patent: 5402186 (1995-03-01), Kawai
patent: 5469217 (1995-11-01), Ibental et al.
patent: 5534935 (1996-07-01), Kawai et al.

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