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Motion compensated de-interlacing and motion estimation based on Yen's generalisation 1 of the sampling theorem (GST) have been proposed by Delogne 2 and Vandendorpe. 3 Motion estimation methods using three-fields have been designed on a block-by-block basis, minimising the difference between two GST predictions. We will show that this criterion degenerates into a two-fields criterion, leading to erroneous motion vectors, when the vertical displacement per field period is an even number ofdoi:10.1117/12.584602 dblp:conf/eiivcp/CiuhuH05 fatcat:k5o64c3sunhrvicdggekqcfrhy