Shape-based functional data analysis

Y Wu, C Huang, A Srivastava - Test, 2024 - Springer
Functional data analysis (FDA) is a fast-growing area of research and development in
statistics. While most FDA literature imposes the classical L 2 Hilbert structure on function …

O (n)-invariant Riemannian metrics on SPD matrices

Y Thanwerdas, X Pennec - Linear Algebra and its Applications, 2023 - Elsevier
Abstract Symmetric Positive Definite (SPD) matrices are ubiquitous in data analysis under
the form of covariance matrices or correlation matrices. Several O (n)-invariant Riemannian …

A Closer Look at Spatial-Slice Features Learning for COVID-19 Detection

CC Hsu, CM Lee, YF Chiang… - Proceedings of the …, 2024 - openaccess.thecvf.com
Abstract Conventional Computed Tomography (CT) imaging recognition faces two
significant challenges:(1) There is often considerable variability in the resolution and size of …

Analyzing dynamical brain functional connectivity as trajectories on space of covariance matrices

M Dai, Z Zhang, A Srivastava - IEEE transactions on medical …, 2019 - ieeexplore.ieee.org
Human brain functional connectivity (FC) is often measured as the similarity of functional
MRI responses across brain regions when a brain is either resting or performing a task. This …

Automatic analysis of facial expressions based on deep covariance trajectories

N Otberdout, A Kacem, M Daoudi… - IEEE transactions on …, 2019 - ieeexplore.ieee.org
In this article, we propose a new approach for facial expression recognition (FER) using
deep covariance descriptors. The solution is based on the idea of encoding local and global …

LESA: Longitudinal elastic shape analysis of brain subcortical structures

Z Zhang, Y Wu, D **ong, JG Ibrahim… - Journal of the …, 2023 - Taylor & Francis
Over the past 30 years, magnetic resonance imaging has become a ubiquitous tool for
accurately visualizing the change and development of the brain's subcortical structures (eg …

Intrinsic riemannian metrics on spaces of curves: Theory and computation

M Bauer, N Charon, E Klassen, A Le Brigant - Handbook of Mathematical …, 2021 - Springer
This chapter reviews some past and recent developments in shape comparison and
analysis of curves based on the computation of intrinsic Riemannian metrics on the space of …

Riemannian and stratified geometries on covariance and correlation matrices

Y Thanwerdas - 2022 - hal.science
In many applications, the data can be represented by covariance matrices or correlation
matrices between several signals (EEG, MEG, fMRI), physical quantities (cells, genes), or …

Is affine-invariance well defined on SPD matrices? A principled continuum of metrics

Y Thanwerdas, X Pennec - … , GSI 2019, Toulouse, France, August 27–29 …, 2019 - Springer
Abstract Symmetric Positive Definite (SPD) matrices have been widely used in medical data
analysis and a number of different Riemannian metrics were proposed to compute with …

A Wasserstein-Type Distance for Gaussian Mixtures on Vector Bundles with Applications to Shape Analysis

M Wilson, T Needham, C Park, S Kundu… - SIAM Journal on Imaging …, 2024 - SIAM
This paper uses sample data to study the problem of comparing populations on finite-
dimensional parallelizable Riemannian manifolds and more general trivial vector bundles …