Search Results for author: Roland Kwitt

Found 35 papers, 19 papers with code

uniGradICON: A Foundation Model for Medical Image Registration

1 code implementation9 Mar 2024 Lin Tian, Hastings Greer, Roland Kwitt, Francois-Xavier Vialard, Raul San Jose Estepar, Sylvain Bouix, Richard Rushmore, Marc Niethammer

We therefore propose uniGradICON, a first step toward a foundation model for registration providing 1) great performance \emph{across} multiple datasets which is not feasible for current learning-based registration methods, 2) zero-shot capabilities for new registration tasks suitable for different acquisitions, anatomical regions, and modalities compared to the training dataset, and 3) a strong initialization for finetuning on out-of-distribution registration tasks.

Image Registration Medical Image Registration

Latent SDEs on Homogeneous Spaces

1 code implementation NeurIPS 2023 Sebastian Zeng, Florian Graf, Roland Kwitt

We consider the problem of variational Bayesian inference in a latent variable model where a (possibly complex) observed stochastic process is governed by the solution of a latent stochastic differential equation (SDE).

Bayesian Inference Variational Inference

On Measuring Excess Capacity in Neural Networks

1 code implementation16 Feb 2022 Florian Graf, Sebastian Zeng, Bastian Rieck, Marc Niethammer, Roland Kwitt

We study the excess capacity of deep networks in the context of supervised classification.

Comparing object recognition in humans and deep convolutional neural networks -- An eye tracking study

no code implementations30 Jul 2021 Leonard E. van Dyck, Roland Kwitt, Sebastian J. Denzler, Walter R. Gruber

Deep convolutional neural networks (DCNNs) and the ventral visual pathway share vast architectural and functional similarities in visual challenges such as object recognition.

Object Recognition

ICON: Learning Regular Maps Through Inverse Consistency

2 code implementations ICCV 2021 Hastings Greer, Roland Kwitt, Francois-Xavier Vialard, Marc Niethammer

We explore if it is possible to obtain spatial regularity using an inverse consistency loss only and elucidate what explains map regularity in such a context.

Representation Learning Translation

Sparse Pose Trajectory Completion

no code implementations1 May 2021 Bo Liu, Mandar Dixit, Roland Kwitt, Gang Hua, Nuno Vasconcelos

In the absence of dense pose sampling in image space, these latent space trajectories provide cross-modal guidance for learning.

Novel View Synthesis Object

Dissecting Supervised Contrastive Learning

1 code implementation17 Feb 2021 Florian Graf, Christoph D. Hofer, Marc Niethammer, Roland Kwitt

Minimizing cross-entropy over the softmax scores of a linear map composed with a high-capacity encoder is arguably the most popular choice for training neural networks on supervised learning tasks.

Contrastive Learning

A Shooting Formulation of Deep Learning

no code implementations NeurIPS 2020 François-Xavier Vialard, Roland Kwitt, Susan Wei, Marc Niethammer

Continuous-depth neural networks can be viewed as deep limits of discrete neural networks whose dynamics resemble a discretization of an ordinary differential equation (ODE).

Topologically Densified Distributions

1 code implementation ICML 2020 Christoph D. Hofer, Florian Graf, Marc Niethammer, Roland Kwitt

We study regularization in the context of small sample-size learning with over-parameterized neural networks.

Deep Multi-View Learning via Task-Optimal CCA

1 code implementation17 Jul 2019 Heather D. Couture, Roland Kwitt, J. S. Marron, Melissa Troester, Charles M. Perou, Marc Niethammer

Canonical Correlation Analysis (CCA) is widely used for multimodal data analysis and, more recently, for discriminative tasks such as multi-view learning; however, it makes no use of class labels.

MULTI-VIEW LEARNING

Connectivity-Optimized Representation Learning via Persistent Homology

1 code implementation21 Jun 2019 Christoph Hofer, Roland Kwitt, Mandar Dixit, Marc Niethammer

In particular, we control the connectivity of an autoencoder's latent space via a novel type of loss, operating on information from persistent homology.

Representation Learning

Graph Filtration Learning

1 code implementation ICML 2020 Christoph D. Hofer, Florian Graf, Bastian Rieck, Marc Niethammer, Roland Kwitt

We propose an approach to learning with graph-structured data in the problem domain of graph classification.

General Classification Graph Classification

Metric Learning for Image Registration

1 code implementation CVPR 2019 Marc Niethammer, Roland Kwitt, Francois-Xavier Vialard

Our approach is a radical departure from existing deep learning approaches to image registration by embedding a deep learning model in an optimization-based registration algorithm to parameterize and data-adapt the registration model itself.

Deformable Medical Image Registration Diffeomorphic Medical Image Registration +2

Stochastic Block Models with Multiple Continuous Attributes

no code implementations7 Mar 2018 Natalie Stanley, Thomas Bonacci, Roland Kwitt, Marc Niethammer, Peter J. Mucha

While there are recent examples in the literature that combine connectivity and attribute information to inform community detection, our model is the first augmented stochastic block model to handle multiple continuous attributes.

Attribute Collaborative Filtering +3

Feature Space Transfer for Data Augmentation

no code implementations CVPR 2018 Bo Liu, Xudong Wang, Mandar Dixit, Roland Kwitt, Nuno Vasconcelos

A new architecture, denoted the FeATure TransfEr Network (FATTEN), is proposed for the modeling of feature trajectories induced by variations of object pose.

Data Augmentation Object +2

Deep Learning with Topological Signatures

4 code implementations NeurIPS 2017 Christoph Hofer, Roland Kwitt, Marc Niethammer, Andreas Uhl

Inferring topological and geometrical information from data can offer an alternative perspective on machine learning problems.

BIG-bench Machine Learning Topological Data Analysis

AGA: Attribute-Guided Augmentation

1 code implementation CVPR 2017 Mandar Dixit, Roland Kwitt, Marc Niethammer, Nuno Vasconcelos

We implement our approach as a deep encoder-decoder architecture that learns the synthesis function in an end-to-end manner.

Attribute Data Augmentation +3

Compressing networks with super nodes

1 code implementation13 Jun 2017 Natalie Stanley, Roland Kwitt, Marc Niethammer, Peter J. Mucha

Community detection is a commonly used technique for identifying groups in a network based on similarities in connectivity patterns.

Social and Information Networks Physics and Society

Fast Predictive Multimodal Image Registration

no code implementations31 Mar 2017 Xiao Yang, Roland Kwitt, Martin Styner, Marc Niethammer

We introduce a deep encoder-decoder architecture for image deformation prediction from multimodal images.

Image Registration

Efficient Registration of Pathological Images: A Joint PCA/Image-Reconstruction Approach

no code implementations31 Mar 2017 Xu Han, Xiao Yang, Stephen Aylward, Roland Kwitt, Marc Niethammer

Registration involving one or more images containing pathologies is challenging, as standard image similarity measures and spatial transforms cannot account for common changes due to pathologies.

Image Reconstruction

AGA: Attribute Guided Augmentation

1 code implementation8 Dec 2016 Mandar Dixit, Roland Kwitt, Marc Niethammer, Nuno Vasconcelos

We implement our approach as a deep encoder-decoder architecture that learns the synthesis function in an end-to-end manner.

Attribute Data Augmentation +3

Fast Predictive Image Registration

no code implementations8 Jul 2016 Xiao Yang, Roland Kwitt, Marc Niethammer

We present a method to predict image deformations based on patch-wise image appearance.

Image Registration

One-Shot Learning of Scene Locations via Feature Trajectory Transfer

no code implementations CVPR 2016 Roland Kwitt, Sebastian Hegenbart, Marc Niethammer

In particular, we leverage a recently introduced dataset with fine-grain annotations to estimate feature trajectories for a collection of transient attributes and then show how these trajectories can be transferred to new image representations.

Attribute One-Shot Learning +1

Statistical Topological Data Analysis - A Kernel Perspective

no code implementations NeurIPS 2015 Roland Kwitt, Stefan Huber, Marc Niethammer, Weili Lin, Ulrich Bauer

We consider the problem of statistical computations with persistence diagrams, a summary representation of topological features in data.

Topological Data Analysis Two-sample testing

Parametric Regression on the Grassmannian

no code implementations14 May 2015 Yi Hong, Nikhil Singh, Roland Kwitt, Nuno Vasconcelos, Marc Niethammer

We then specialize this idea to the Grassmann manifold and demonstrate that it yields a simple, extensible and easy-to-implement solution to the parametric regression problem.

Crowd Counting regression

Proceedings of The 39th Annual Workshop of the Austrian Association for Pattern Recognition (OAGM), 2015

no code implementations30 Apr 2015 Sebastian Hegenbart, Roland Kwitt, Andreas Uhl

The 39th annual workshop of the Austrian Association for Pattern Recognition (OAGM/AAPR) provides a platform for presentation and discussion of research progress as well as research projects within the OAGM/AAPR community.

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