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We propose new methods for estimating the frontier of a set of points. The estimates are defined as kernel functions covering all the points and whose associated support is of smallest surface. They are written as linear combinations of kernel functions applied to the points of the sample. The weights of the linear combination are then computed by solving a(More)
Digital image analysis appears to be more and more relevant to the study of physical phenomena involving uid motion, and of their evolution over time. In that context, 2D deformable motion analysis is one of the most important issues to be investigated. The interpretation of such deformable 2D ow elds can generally be stated as the characterization of(More)
We discuss new methods for the recovery of signals with block-sparse structure, based on 1-minimization. Our emphasis is on the efficiently computable error bounds for the recovery routines. We optimize these bounds with respect to the method parameters to construct the estimators with improved statistical properties. We justify the proposed approach with(More)
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