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Lifting methods allow to transform hard variational problems such as segmentation and optical flow estimation into convex problems in a suitable higher-dimensional space. The lifted models can then be efficiently solved to a global optimum,…

Numerical Analysis · Mathematics 2019-08-13 Thomas Vogt , Evgeny Strekalovskiy , Daniel Cremers , Jan Lellmann

We show that under natural and quite general assumptions, a large part of a matrix for a bounded linear operator on a Hilbert space can be preassigned. The result is obtained in a more general setting of operator tuples leading to…

Functional Analysis · Mathematics 2023-11-10 Vladimir Müller , Yuri Tomilov

A classification of 2-dimensional surfaces imbedded in spacetime is presented, according to the algebraic properties of their shape tensor. The classification has five levels, and provides among other things a refinement of the concepts of…

General Relativity and Quantum Cosmology · Physics 2008-11-26 José M M Senovilla

In this paper a novel efficient method for representation of facial action units by encoding an image sequence as a fourth-order tensor is presented. The multilinear tensor-based extension of the biased discriminant analysis (BDA)…

Computer Vision and Pattern Recognition · Computer Science 2010-04-06 Mahmoud Khademi , Mehran Safayani , Mohammad T. Manzuri-Shalmani

This paper shows how internal models for polymorphic lambda calculi arise in any 2-category with a notion of discreteness. We generalise to a 2-categorical setting the famous theorem of Peter Freyd saying that there are no sufficiently…

Category Theory · Mathematics 2014-10-16 Michal R. Przybylek

Abstract inner automorphisms can be used to promote any category into a 2-category, and we study two-dimensional limits and colimits in the resulting 2-categories. Existing connected colimits and limits in the starting category become…

Category Theory · Mathematics 2025-09-08 Pieter Hofstra , Martti Karvonen

Let $R$ denote a 2-fir. The notions of F-independence and algebraic subsets of R are defined. The decomposition of an algebraic subset into similarity classes gives a simple way of translating the F-independence in terms of dimension of…

Rings and Algebras · Mathematics 2007-05-23 A. Leroy , A. Ozturk

Slide-level classification for whole-slide images (WSIs) has been widely recognized as a crucial problem in digital and computational pathology. Current approaches commonly consider WSIs as a bag of cropped patches and process them via…

Computer Vision and Pattern Recognition · Computer Science 2024-07-12 Doanh C. Bui , Trinh Thi Le Vuong , Jin Tae Kwak

Recently, we have seen an increase in the global facial recognition market size. Despite significant advances in face recognition technology with the adoption of convolutional neural networks, there are still open challenges, such as when…

Computer Vision and Pattern Recognition · Computer Science 2021-10-19 Marcus de Assis Angeloni , Helio Pedrini

In this work we focus on learning facial representations that can be adapted to train effective face recognition models, particularly in the absence of labels. Firstly, compared with existing labelled face datasets, a vastly larger…

Computer Vision and Pattern Recognition · Computer Science 2024-03-14 Zhonglin Sun , Chen Feng , Ioannis Patras , Georgios Tzimiropoulos

We propose a simple approach to visual alignment, focusing on the illustrative task of facial landmark estimation. While most prior work treats this as a regression problem, we instead formulate it as a discrete $K$-way classification task,…

Computer Vision and Pattern Recognition · Computer Science 2018-02-15 Mengtian Li , Laszlo Jeni , Deva Ramanan

Confounding bias is a crucial problem when applying machine learning to practice, especially in clinical practice. We consider the problem of learning representations independent to multiple biases. In literature, this is mostly solved by…

Computer Vision and Pattern Recognition · Computer Science 2021-06-30 Xianjing Liu , Bo Li , Esther Bron , Wiro Niessen , Eppo Wolvius , Gennady Roshchupkin

Considering the question: how non-linear may a non-linear operator be in order to extend the linear regularization theory, we introduce the class of dilinear mappings, which covers linear, bilinear, and quadratic operators between Banach…

Numerical Analysis · Mathematics 2021-03-19 Robert Beinert , Kristian Bredies

A significant limiting factor in training fair classifiers relates to the presence of dataset bias. In particular, face datasets are typically biased in terms of attributes such as gender, age, and race. If not mitigated, bias leads to…

Computer Vision and Pattern Recognition · Computer Science 2020-06-09 Markos Georgopoulos , James Oldfield , Mihalis A. Nicolaou , Yannis Panagakis , Maja Pantic

Muscle-based systems have the potential to provide both anatomical accuracy and semantic interpretability as compared to blendshape models; however, a lack of expressivity and differentiability has limited their impact. Thus, we propose…

Computer Vision and Pattern Recognition · Computer Science 2018-12-10 Michael Bao , Matthew Cong , Stéphane Grabli , Ronald Fedkiw

We introduce characteristic functions for certain contractive liftings of row contractions. These are multi-analytic operators which classify the liftings up to unitary equivalence and provide a kind of functional model. The most important…

Operator Algebras · Mathematics 2007-07-11 Santanu Dey , Rolf Gohm

In this paper we present two different problems within the framework of shift-invariant theory. First, we develop a triangular form for shift-preserving operators acting on finitely generated shift-invariant spaces. In case of the normal…

Functional Analysis · Mathematics 2026-01-12 Elona Agora , Jorge Antezana , Diana Carbajal

We compare various viewpoints on down-sets (simplicial complexes), illustrating how the combinatorial inclusion-exclusion principle may serve as an alternative to more advanced methods of studying their face numbers.

Combinatorics · Mathematics 2015-03-13 Michal Adamaszek

The purpose of this paper is to investigate the global categorical symmetries that arise when gauging finite higher groups in three or more dimensions. The motivation is to provide a common perspective on constructions of non-invertible…

High Energy Physics - Theory · Physics 2024-07-17 Thomas Bartsch , Mathew Bullimore , Andrea E. V. Ferrari , Jamie Pearson

We study the problem of performing classification in a manner that is fair for sensitive groups, such as race and gender. This problem is tackled through the lens of disentangled and locally fair representations. We learn a locally fair…

Machine Learning · Computer Science 2022-05-06 Yaron Gurovich , Sagie Benaim , Lior Wolf
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