Search Results for author: Marco Viola

Found 5 papers, 3 papers with code

Cartoon-texture evolution for two-region image segmentation

no code implementations7 Mar 2022 Laura Antonelli, Valentina De Simone, Marco Viola

Two-region image segmentation is the process of dividing an image into two regions of interest, i. e., the foreground and the background.

Image Segmentation Segmentation +2

Sparse Approximations with Interior Point Methods

no code implementations26 Feb 2021 Valentina De Simone, Daniela di Serafino, Jacek Gondzio, Spyridon Pougkakiotis, Marco Viola

Large-scale optimization problems that seek sparse solutions have become ubiquitous.

Portfolio Optimization Optimization and Control Numerical Analysis Numerical Analysis 65K05, 90C51, 90C25, 65F10, 65F08, 90C90

Using gradient directions to get global convergence of Newton-type methods

1 code implementation2 Apr 2020 Daniela di Serafino, Gerardo Toraldo, Marco Viola

The renewed interest in Steepest Descent (SD) methods following the work of Barzilai and Borwein [IMA Journal of Numerical Analysis, 8 (1988)] has driven us to consider a globalization strategy based on SD, which is applicable to any line-search method.

Optimization and Control Numerical Analysis Numerical Analysis 65K05, 90C30, 49M15 G.1.6

A subspace-accelerated split Bregman method for sparse data recovery with joint l1-type regularizers

1 code implementation14 Dec 2019 Valentina De Simone, Daniela di Serafino, Marco Viola

We propose a subspace-accelerated Bregman method for the linearly constrained minimization of functions of the form $f(\mathbf{u})+\tau_1 \|\mathbf{u}\|_1 + \tau_2 \|D\,\mathbf{u}\|_1$, where $f$ is a smooth convex function and $D$ represents a linear operator, e. g. a finite difference operator, as in anisotropic Total Variation and fused-lasso regularizations.

Optimization and Control Numerical Analysis Numerical Analysis 65K05, 90C25 G.1.6

ACQUIRE: an inexact iteratively reweighted norm approach for TV-based Poisson image restoration

1 code implementation27 Jul 2018 Daniela di Serafino, Germana Landi, Marco Viola

We propose a method, called ACQUIRE, for the solution of constrained optimization problems modeling the restoration of images corrupted by Poisson noise.

Optimization and Control 90C25, 65K05, 94A08

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