Search Results for author: Timo Ropinski

Found 34 papers, 18 papers with code

Evaluating Text-to-Image Synthesis: Survey and Taxonomy of Image Quality Metrics

no code implementations18 Mar 2024 Sebastian Hartwig, Dominik Engel, Leon Sick, Hannah Kniesel, Tristan Payer, Poonam Poonam, Michael Glöckler, Alex Bäuerle, Timo Ropinski

Recent advances in text-to-image synthesis enabled through a combination of language and vision foundation models have led to a proliferation of the tools available and an increased attention to the field.

Image Generation

Attention-Guided Masked Autoencoders For Learning Image Representations

no code implementations23 Feb 2024 Leon Sick, Dominik Engel, Pedro Hermosilla, Timo Ropinski

Masked autoencoders (MAEs) have established themselves as a powerful method for unsupervised pre-training for computer vision tasks.

Object Discovery Unsupervised Pre-training

Open3DSG: Open-Vocabulary 3D Scene Graphs from Point Clouds with Queryable Objects and Open-Set Relationships

no code implementations19 Feb 2024 Sebastian Koch, Narunas Vaskevicius, Mirco Colosi, Pedro Hermosilla, Timo Ropinski

We co-embed the features from a 3D scene graph prediction backbone with the feature space of powerful open world 2D vision language foundation models.

Object

Lang3DSG: Language-based contrastive pre-training for 3D Scene Graph prediction

no code implementations25 Oct 2023 Sebastian Koch, Pedro Hermosilla, Narunas Vaskevicius, Mirco Colosi, Timo Ropinski

While it is widely accepted that pre-training is an effective approach to improve model performance in low data regimes, in this paper, we find that existing pre-training methods are ill-suited for 3D scene graphs.

Language Modelling

SGRec3D: Self-Supervised 3D Scene Graph Learning via Object-Level Scene Reconstruction

no code implementations27 Sep 2023 Sebastian Koch, Pedro Hermosilla, Narunas Vaskevicius, Mirco Colosi, Timo Ropinski

In the field of 3D scene understanding, 3D scene graphs have emerged as a new scene representation that combines geometric and semantic information about objects and their relationships.

Graph Learning Scene Understanding

Unsupervised Semantic Segmentation Through Depth-Guided Feature Correlation and Sampling

no code implementations21 Sep 2023 Leon Sick, Dominik Engel, Pedro Hermosilla, Timo Ropinski

We achieve this by (1) learning depth-feature correlation by spatially correlate the feature maps with the depth maps to induce knowledge about the structure of the scene and (2) implementing farthest-point sampling to more effectively select relevant features by utilizing 3D sampling techniques on depth information of the scene.

Feature Correlation Unsupervised Semantic Segmentation

Leveraging Self-Supervised Vision Transformers for Neural Transfer Function Design

no code implementations4 Sep 2023 Dominik Engel, Leon Sick, Timo Ropinski

In volume rendering, transfer functions are used to classify structures of interest, and to assign optical properties such as color and opacity.

ClusterNet: A Perception-Based Clustering Model for Scattered Data

no code implementations27 Apr 2023 Sebastian Hartwig, Christian van Onzenoodt, Dominik Engel, Pedro Hermosilla, Timo Ropinski

Finally, we compare our approach against existing state-of-the-art clustering techniques and can show, that ClusterNet is able to generalize to unseen and out of scope data.

Clustering Outlier Detection

LLMMaps -- A Visual Metaphor for Stratified Evaluation of Large Language Models

1 code implementation2 Apr 2023 Patrik Puchert, Poonam Poonam, Christian van Onzenoodt, Timo Ropinski

To support such stratified evaluations, we propose LLMMaps as a novel visualization technique that enables users to evaluate LLMs' performance with respect to Q&A datasets.

Weakly-Supervised Optical Flow Estimation for Time-of-Flight

1 code implementation11 Oct 2022 Michael Schelling, Pedro Hermosilla, Timo Ropinski

Indirect Time-of-Flight (iToF) cameras are a widespread type of 3D sensor, which perform multiple captures to obtain depth values of the captured scene.

Motion Compensation Optical Flow Estimation

Monocular Depth Decomposition of Semi-Transparent Volume Renderings

1 code implementation27 Jun 2022 Dominik Engel, Sebastian Hartwig, Timo Ropinski

Additionally, we investigate how these networks can be extended to further obtain color and opacity information, in order to create a layered representation of the scene based on a single color image.

Monocular Depth Estimation

Neural Activation Patterns (NAPs): Visual Explainability of Learned Concepts

no code implementations20 Jun 2022 Alex Bäuerle, Daniel Jönsson, Timo Ropinski

Promising methods for discovering learned features are based on analyzing activation values, whereby current techniques focus on analyzing high activation values to reveal interesting features on a neuron level.

Contrastive Representation Learning for 3D Protein Structures

no code implementations31 May 2022 Pedro Hermosilla, Timo Ropinski

Learning from 3D protein structures has gained wide interest in protein modeling and structural bioinformatics.

Contrastive Learning Protein Function Prediction +1

Differentiable Electron Microscopy Simulation: Methods and Applications for Visualization

no code implementations8 May 2022 Ngan Nguyen, Feng Liang, Dominik Engel, Ciril Bohak, Peter Wonka, Timo Ropinski, Ivan Viola

We propose a new microscopy simulation system that can depict atomistic models in a micrograph visual style, similar to results of physical electron microscopy imaging.

Denoising

Clean Implicit 3D Structure from Noisy 2D STEM Images

1 code implementation CVPR 2022 Hannah Kniesel, Timo Ropinski, Tim Bergner, Kavitha Shaga Devan, Clarissa Read, Paul Walther, Tobias Ritschel, Pedro Hermosilla

Scanning Transmission Electron Microscopes (STEMs) acquire 2D images of a 3D sample on the scale of individual cell components.

Gaussian Mixture Convolution Networks

1 code implementation ICLR 2022 Adam Celarek, Pedro Hermosilla, Bernhard Kerbl, Timo Ropinski, Michael Wimmer

This paper proposes a novel method for deep learning based on the analytical convolution of multidimensional Gaussian mixtures.

Visual Identification of Problematic Bias in Large Label Spaces

1 code implementation17 Jan 2022 Alex Bäuerle, Aybuke Gul Turker, Ken Burke, Osman Aka, Timo Ropinski, Christina Greer, Mani Varadarajan

With our approach, different models and datasets for large label spaces can be systematically and visually analyzed and compared to make informed fairness assessments tackling problematic bias.

Fairness

Variance-Aware Weight Initialization for Point Convolutional Neural Networks

no code implementations7 Dec 2021 Pedro Hermosilla, Michael Schelling, Tobias Ritschel, Timo Ropinski

Appropriate weight initialization has been of key importance to successfully train neural networks.

RADU: Ray-Aligned Depth Update Convolutions for ToF Data Denoising

1 code implementation CVPR 2022 Michael Schelling, Pedro Hermosilla, Timo Ropinski

Time-of-Flight (ToF) cameras are subject to high levels of noise and distortions due to Multi-Path-Interference (MPI).

Denoising

Data-driven deep density estimation

1 code implementation23 Jul 2021 Patrik Puchert, Pedro Hermosilla, Tobias Ritschel, Timo Ropinski

Density estimation plays a crucial role in many data analysis tasks, as it infers a continuous probability density function (PDF) from discrete samples.

Density Estimation

A3GC-IP: Attention-Oriented Adjacency Adaptive Recurrent Graph Convolutions for Human Pose Estimation from Sparse Inertial Measurements

no code implementations23 Jul 2021 Patrik Puchert, Timo Ropinski

Conventional methods for human pose estimation either require a high degree of instrumentation, by relying on many inertial measurement units (IMUs), or constraint the recording space, by relying on extrinsic cameras.

Data Augmentation Graph Learning +1

Finding Nano-Ötzi: Semi-Supervised Volume Visualization for Cryo-Electron Tomography

no code implementations4 Apr 2021 Ngan Nguyen, Ciril Bohak, Dominik Engel, Peter Mindek, Ondřej Strnad, Peter Wonka, Sai Li, Timo Ropinski, Ivan Viola

Our technique shows the high impact in target sciences for visual data analysis of very noisy volumes that cannot be visualized with existing techniques.

Electron Tomography Segmentation

exploRNN: Understanding Recurrent Neural Networks through Visual Exploration

no code implementations9 Dec 2020 Alex Bäuerle, Patrick Albus, Raphael Störk, Tina Seufert, Timo Ropinski

In an empirical study, we assessed 37 subjects in a between-subjects design to investigate the learning outcomes and cognitive load of exploRNN compared to a classic text-based learning environment.

Deep Volumetric Ambient Occlusion

1 code implementation19 Aug 2020 Dominik Engel, Timo Ropinski

We present a novel deep learning based technique for volumetric ambient occlusion in the context of direct volume rendering.

Enabling Viewpoint Learning through Dynamic Label Generation

1 code implementation10 Mar 2020 Michael Schelling, Pedro Hermosilla, Pere-Pau Vazquez, Timo Ropinski

Optimal viewpoint prediction is an essential task in many computer graphics applications.

Classifying the classifier: dissecting the weight space of neural networks

1 code implementation13 Feb 2020 Gabriel Eilertsen, Daniel Jönsson, Timo Ropinski, Jonas Unger, Anders Ynnerman

of neural network classifiers, and train a large number of models to represent the weight space.

16k

Total Denoising: Unsupervised Learning of 3D Point Cloud Cleaning

1 code implementation ICCV 2019 Pedro Hermosilla, Tobias Ritschel, Timo Ropinski

We show that denoising of 3D point clouds can be learned unsupervised, directly from noisy 3D point cloud data only.

Denoising valid

Training Object Detectors on Synthetic Images Containing Reflecting Materials

no code implementations29 Mar 2019 Sebastian Hartwig, Timo Ropinski

While synthesized data sets can be used to overcome this challenge, it is important that these data sets close the reality gap, i. e., a model trained on synthetic image data is able to generalize to real images.

Image Generation Object

Net2Vis -- A Visual Grammar for Automatically Generating Publication-Tailored CNN Architecture Visualizations

1 code implementation11 Feb 2019 Alex Bäuerle, Christian van Onzenoodt, Timo Ropinski

To convey neural network architectures in publications, appropriate visualizations are of great importance.

Deep-learning the Latent Space of Light Transport

1 code implementation12 Nov 2018 Pedro Hermosilla, Sebastian Maisch, Tobias Ritschel, Timo Ropinski

Thus, we suggest a two-stage operator comprising of a 3D network that first transforms the point cloud into a latent representation, which is later on projected to the 2D output image using a dedicated 3D-2D network in a second step.

Computational Efficiency

Classifier-Guided Visual Correction of Noisy Labels for Image Classification Tasks

1 code implementation9 Aug 2018 Alex Bäuerle, Heiko Neumann, Timo Ropinski

We thus propose a novel approach that uses the power of pretrained classifiers to visually guide users to noisy labels, and let them interactively check error candidates, to iteratively improve the training data set.

BIG-bench Machine Learning General Classification +1

Monte Carlo Convolution for Learning on Non-Uniformly Sampled Point Clouds

1 code implementation5 Jun 2018 Pedro Hermosilla, Tobias Ritschel, Pere-Pau Vázquez, Àlvar Vinacua, Timo Ropinski

We propose an efficient and effective method to learn convolutions for non-uniformly sampled point clouds, as they are obtained with modern acquisition techniques.

Point Cloud Segmentation

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