ORBi: Delcourt Johann - A new automatic video multitracking system able to follow a large school

Reference : A new automatic video multitracking system able to follow a large school


	Document type :	Scientific congresses and symposiums : Paper published in a book
	Discipline(s) :	Life sciences : Zoology
	To cite this reference:	http://hdl.handle.net/2268/6102

Title :	A new automatic video multitracking system able to follow a large school
Language :	English
Author, co-author :	Delcourt, Johann [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Biologie du comportement - Ethologie et psychologie animale >]
	Becco, Christophe [Université de Liège - ULg > Département de physique > Département de physique >]
	Vandewalle, Nicolas [Université de Liège - ULg > Département de physique > Physique statistique >]
	Poncin, Pascal [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Biologie du comportement - Ethologie et psychologie animale >]
Publication date :	2005
Main document title :	Proceedings of Measuring Behavior 2005
Author, co-author :	Noldus, L.P.P.J.
	Grieco, F.
	Loijens, L. W. S.
	Zimmerman, P. H.
Publisher :	Noldus Information technology
Pages :	405-406
Peer reviewed :	Yes
On invitation :	No
Audience :	International
ISBN :	90-74821-71-5
City :	Wageningen
Country :	The Netherlands
Event name :	Measuring Behavior 2005
Event date :	du 30 aoüt au 2 septembre 2005
Event organizer :	Noldus Information technology
Event place (city) :	Wageningen
Event country :	The Netherlands
Abstract :	[en] The study of shoaling behaviours is tackled by scientists by three approaches: the field, laboratory and computer modelling approach. The field studies are complicated and permit rarely an analysis of individual positions. The third approach, consisting of development of mathematic models, is artificial. It requires a comparison with empiric results to validate and to determine the explications’ degree of each model. Thanks to the developments of digital imaging techniques, the laboratory studies on fish are able to measure the behavioural parameters with precision, impossible to realize with manual recording. Multitracking systems are rare and of recent development. These are insufficient to study the real size of shoals, often composed of hundreds of .shes. We have developed a new system of multitracking thanks to collaboration with the G.R.A.S.P. The G.R.A.S.P. has before realised other multitracking systems to follow some hundreds physical objects. Our video multitracking system is able to detect and to track more than a hundred unmarked fishes by gray scaling technique during some minutes. It permits an analysis as well at the group level as at the individual level. The multitraking program is able to attribute a number at each fish and to follow each one during the whole duration of the track. Our system permits the analysis of the movement of each individual, even if the trajectories of two fishes cross each other. It is possible thanks to the theoretical estimation of trajectory of each fish, compared with the real trajectory (analysis with feedback). The human eye is always necessary to detect the errors in identification but reediting is possible. However, if the fishes don’t move too rapidly, a rate of 25 images /s gives very good results, without too much visual expertise from the experimenter. If the fishes are too fast (i.e. escape response), it is better to use a high speed camera.
Research units :	Unité Biologie du Comportement: Laboratoire d'éthologie des poissons et des amphibiens
Funders :	Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Target :	Researchers ; Professionals
Permalink :	http://hdl.handle.net/2268/6102

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