The diffusion of Radon Shape
In 1977, D. G. Kendall [J. Appl. Probab. 28 (1991), no. 1, 225--230; MR1090460 (92f:60135)] considered diffusions of shape induced by independent Brownian motions in Euclidean space. In this paper, we consider a different class of diffusions of shape, induced by the projections of a randomly rotating, labelled ensemble. In particular, we study diffusions of shapes induced by projections of planar triangular configurations of labelled points onto a fixed straight line. That is, we consider the process in $\Sigma^3_1$ (the shape space of triads in $\Bbb R$) that results from extracting the `shape information' from the projection of a given labelled planar triangle as this evolves under the action of Brownian motion in SO(2). We term the thus-defined diffusions Radon diffusions and derive explicit stochastic differential equations and stationary distributions. The latter belong to the family of angular central Gaussian distributions. In addition, we discuss how these Radon diffusions and their limiting distributions are related to the shape of the initial triangle, and explore whether the relationship is bijective. The triangular case is then used as a basis for the study of processes in $\Sigma^k_1$ arising from projections of an arbitrary number, $k$, of labelled points on the plane. Finally, we discuss the problem of Radon diffusions in the general shape space $\Sigma^k_n$.
Keywords: Single-particle biophysics ; circular Brownian motion ; Kendall's shape theory ; angular central Gaussian distribution ; integral geometry ; stochastic geometry ; random processes of geometrical objects ; Radon diffusion ; Radon transform ; singular value decomposition
Record created on 2009-03-31, modified on 2016-08-08