US 6,983,013 B1
Method and device for encoding video signal
Pierre Gautier, Nogent-sur-Marne (France); Sandra Del Corso, Clamart (France); and Isabelle Lemaguet, Paris (France)
Assigned to Koninklijke Philips Electronics N.V., Eindhoven (Netherlands)
Appl. No. 9/806,091
PCT Filed Jul. 31, 2000, PCT No. PCT/EP00/07425
§ 371(c)(1), (2), (4) Date Mar. 26, 2001,
PCT Pub. No. WO01/10133, PCT Pub. Date Feb. 08, 2001.
Claims priority of application No. 99401969 (EP), filed on Aug. 03, 1999; and application No. 99403228 (EP), filed on Dec. 21, 1999.
Int. Cl. H04N 7/12 (2006.01)
U.S. Cl. 375—240 7 Claims
OG exemplary drawing
 
1. A method for encoding video signals corresponding to a sequence of frames each of which originally consists of two fields F1 and F2, in which the encoding step is preceded by a preprocessing step which itself comprises the sub-steps of:
(A) receiving the successive frames and delaying each of them with a delay of at least two fields;
(B) adjusting said delay according to the following dominance change criterion:
(a) when a change from an F1 dominance to an F2 dominance is detected, the first field of the first F2 dominant frame is suppressed, said delay being therefore decreased by a quantity equal to “one field” duration;
(b) when a change from an F2 dominance to an F1 dominance is detected, the last field of the last F2 dominant frame is repeated, the delay being therefore increased by a quantity equal to “one field” duration.