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annotation centroid are computed explicitly and projected at that step if required
author Nicolas Saunier <nicolas.saunier@polymtl.ca>
date Fri, 05 Dec 2014 16:41:11 -0500
parents d44eba0db517
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# get object id, first and last frame numbers, length and number of features
select OF.object_id, min(P.frame_number) as frame1, max(P.frame_number) as frame2, max(P.frame_number)-min(P.frame_number) as length, count(OF.trajectory_id) as nfeatures from positions P, objects_features OF where P.trajectory_id = OF.trajectory_id group by OF.object_id order by nfeatures asc;