Television – Format conversion – Progressive to interlace
Patent
1996-06-24
1997-12-30
Lee, Michael H.
Television
Format conversion
Progressive to interlace
348 97, 348384, 348474, H04N 701, H04N 5253, H04N 708
Patent
active
057036543
ABSTRACT:
A video signal encoder encodes an interlaced video signal having a field frequency of 60 Hz obtained by overlapping a portion of first fields and second fields, in which the first field and the second field are produced from one frame of a non-interlaced video signal having a frame frequency of 24 Hz. This encoder has a field identification signal generating unit for externally receiving the interlaced video signal to thereby generate a field identification signal indicative of switching of the respective fields of the interlaced video signal; and an encoding unit for externally receiving a top field signal which becomes active with respect to a top field among the plural fields of the interlaced video signal corresponding to the respective frames of the non-interlaced video signal, and for encoding the interlaced video signal based on the top field signal and the field identification signal by skipping the portion of the overlapped fields. Also, a secondary top field signal may be generated by changing an even-numbered field in said top field signal into a non-active field based upon said field identification signal when said top field signal continuously becomes active over a plurality of fields corresponding to the respective frames of said non-interlaced video signal.
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Lee Michael H.
Nippon Steel Corporation
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