Mod\`ele g\'eom\'etrique pour une Caract\'erisation morphom\'etrique d'individus dans des conditions \textit{in situ}

We develop a non invasive method for determine morphometric caracteristic of individuals. We modelize a individual by a polyarticulated chain of rigid segments and each of these segments corresponds to a volume. For this, each segment is photographed under two orthogonal plans and each image is digitalized. By assuming that the border of each segment can be described under cylindric coordinates, the border is reconstructed by interpolation. Finally, the principal morphometric data are determined.