Connections between deep equilibrium and sparse representation models with application to hyperspectral image denoising

A Gkillas, D Ampeliotis… - IEEE Transactions on …, 2023 - ieeexplore.ieee.org
In this study, the problem of computing a sparse representation of multi-dimensional visual
data is considered. In general, such data eg, hyperspectral images, color images or video …

Federated dictionary learning from non-iid data

A Gkillas, D Ampeliotis… - 2022 IEEE 14th Image …, 2022 - ieeexplore.ieee.org
The problem of learning a common dictionary by following a federated learning framework,
in a network where each edge user may have statistically different data, is considered. In …

Subspace Parsimonious Dictionary Learning and its use in Federated Learning

D Ampeliotis, A Gkillas - 2023 24th International Conference on …, 2023 - ieeexplore.ieee.org
A federated dictionary learning problem, in which the edge devices have data with different
statistical properties, is considered. A dictionary learning cost function that can lead to …

Fast sparse coding algorithms for piece-wise smooth signals

A Gkillas, D Ampeliotis… - 2020 28th European …, 2021 - ieeexplore.ieee.org
The problem of computing a proper sparse representation matrix for a signal matrix that
obeys some local smoothness property, given an over-complete dictionary, is considered …

An Optimization-based Deep Equilibrium Model for Hyperspectral Image Deconvolution with Convergence Guarantees

A Gkillas, D Ampeliotis, K Berberidis - arxiv preprint arxiv:2306.06378, 2023 - arxiv.org
In this paper, we propose a novel methodology for addressing the hyperspectral image
deconvolution problem. This problem is highly ill-posed, and thus, requires proper priors …

[PDF][PDF] Optimization-based Models for Explainable Deep Learning Architectures in Multidimensional Signal Processing Applications

A Gkillas - 2024 - researchgate.net
The rapid advancements in technology and the proliferation of digital devices have led to an
unprecedented explosion of data [14]. This data is generated continuously by a myriad of …