21 citations · 52 across the 17 of their papers we have counts for
3 papers · 1 filter
Optimal translational-rotational invariant dictionaries for images
Davide Barbieri, Carlos Cabrelli, Eugenio Hernández +1
We provide the construction of a set of square matrices whose translates and rotates provide a Parseval frame that is optimal for approximating a given dataset of images. Our appro…
Approximation by group invariant subspaces
Davide Barbieri, Carlos Cabrelli, Eugenio Hernández +1
In this article we study the structure of -invariant spaces of . Here is a second countable LCA group. The invariance is with respect to the action of , a…
Extra invariance of principal shift invariant spaces and the Zak transform
Davide Barbieri, Eugenio Hernandez, Carolina A. Mosquera
We prove a necessary and sufficient condition for a principal shift invariant space of to be invariant under translations by the subgroup $\frac{1}{N} \mathbb{Z},…