Methods for repeated field detection

Details Methods for repeated field detection Methods for repeated field detection

1995-04-04

1997-02-25

Kostak, Victor R.

Television

Format conversion

Changing number of fields for standard conversion

348558, H04N 701

Patent

active

056063733

ABSTRACT:
A system and method for repeat field detection for use in rate conversion and video encoding of the type contemplated by the MPEG standards. Before encoding a frame, first field in the current frame is compared to the previously occurring field of the same parity. Next, a single number (the inter-field parameter) is generated, which is a measure of the difference between the two fields. If the inter-field parameter is below a threshold a signal is generated to indicate that the current field is a repeat of the previous field of the same parity. Otherwise, the signal is generated to indicate that the field is not a repeat of the previous field of the same parity (i.e. the field likely contains at least one small area of motion).

REFERENCES:
patent: 4485403 (1984-11-01), Illetschko
patent: 4652907 (1987-03-01), Fling
patent: 4982280 (1991-01-01), Lyon et al.
patent: 4987489 (1991-01-01), Harley et al.
patent: 5406333 (1995-04-01), Martin
patent: 5412435 (1995-05-01), Nakajima

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