Reference : A new automatic video multitracking system able to follow a large school
Scientific congresses and symposiums : Paper published in a book
Life sciences : Zoology
http://hdl.handle.net/2268/6102
A new automatic video multitracking system able to follow a large school
English
Delcourt, Johann mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Biologie du comportement - Ethologie et psychologie animale >]
Becco, Christophe mailto [Université de Liège - ULg > Département de physique > Département de physique >]
Vandewalle, Nicolas mailto [Université de Liège - ULg > Département de physique > Physique statistique >]
Poncin, Pascal mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Biologie du comportement - Ethologie et psychologie animale >]
2005
Proceedings of Measuring Behavior 2005
Noldus, L.P.P.J.
Grieco, F.
Loijens, L. W. S.
Zimmerman, P. H.
Noldus Information technology
405-406
Yes
No
International
90-74821-71-5
Wageningen
The Netherlands
Measuring Behavior 2005
du 30 aoüt au 2 septembre 2005
Noldus Information technology
Wageningen
The Netherlands
[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.
Unité Biologie du Comportement: Laboratoire d'éthologie des poissons et des amphibiens
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Researchers ; Professionals
http://hdl.handle.net/2268/6102

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Restricted access
DelcourtMeasuringbehavior2005.pdfPublisher postprint423.19 kBRequest copy

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.