The dictionary approach for spherical deconvolution

Thanh Mai Pham Ngoc (1) , Vincent Rivoirard (2)

1 LM-Orsay - Laboratoire de Mathématiques d'Orsay
2 CEREMADE - CEntre de REcherches en MAthématiques de la DEcision

We consider the problem of estimating a density of probability from indirect data in the spherical convolution model. We aim at building an estimate of the unknown density as a linear combination of functions of an overcomplete dictionary. The procedure is devised through a well-calibrated l1-penalized criterion. The spherical deconvolution setting has been barely studied so far, and the two main approches to this problem, namely the SVD and the hard thresholding ones considered only one basis at a time. The dictionary approach allows to combine various bases and thus enhances estimates sparsity. We provide an oracle inequality under global coherence assumptions. Moreover, the calibrated procedure that we put forward gives very satisfying results in the numerical study when compared with other procedures.

Mots clés: Second generation wavelets; Density deconvolution; Dictionary; Lasso estimate; Oracle inequalities; Calibration; Sparsity; Second generation wavelets.

Domaines: Statistiques [math.ST]; Théorie [stat.TH]

Thanh Mai Pham Ngoc, Vincent Rivoirard. The dictionary approach for spherical deconvolution. Journal of Multivariate Analysis, 2013, 115, pp.138-156. ⟨hal-00616519⟩