Method and device for film-mode detection and field elimination

Details Method and device for film-mode detection and field elimination Method and device for film-mode detection and field elimination

1994-03-14

1995-09-19

Groody, James J.

Television

Synchronization

Sync separation

348 97, 348449, 348459, 348102, H04N 508

Patent

active

054520118

ABSTRACT:
A method for determining which of similar video fields may be excised to enhance video signal compression evaluates parameters of four successive fields denoted 0, 1, 2, and 3. Accumulated differences d(0, 2) and d(1,3) of corresponding pixels in successive frames are generated. In addition a determination is made whether fields 1 and 2 exhibit interlace characteristics. If they do not exhibit interlaced characteristics, a comparison is made of d(0, 2) and d(1, 3). If d(0, 2) is less than d(1, 3) by a predetermined amount, field 2 is excised from the signal stream and a code is generated to condition a receiver to display two of the remaining four fields in a three field interval. Subsequently the latter two fields of the set of 0, 1, 2 and 3 fields, and the next two occurring fields are similarly analyzed.

REFERENCES:
patent: 4641188 (1987-02-01), Dischert
patent: 4703358 (1987-10-01), Flannaghan
patent: 4982280 (1991-01-01), Lyon et al.
patent: 5111511 (1992-05-01), Ishii et al.
patent: 5191427 (1993-03-01), Richards et al.

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