Search Results for author: Johannes Stegmaier

Found 30 papers, 8 papers with code

Annotated Biomedical Video Generation using Denoising Diffusion Probabilistic Models and Flow Fields

no code implementations26 Mar 2024 Rüveyda Yilmaz, Dennis Eschweiler, Johannes Stegmaier

It is composed of a denoising diffusion probabilistic model (DDPM) generating high-fidelity synthetic cell microscopy images and a flow prediction model (FPM) predicting the non-rigid transformation between consecutive video frames.

Cell Segmentation Denoising +1

Optimizing Retinal Prosthetic Stimuli with Conditional Invertible Neural Networks

no code implementations7 Mar 2024 Yuli Wu, Julian Wittmann, Peter Walter, Johannes Stegmaier

However, the information transmission between the camera and retinal cells is often limited by the low resolution of the electrode array and the lack of specificity for different ganglion cell types, resulting in suboptimal stimulations.

Specificity

Enhancing Lidar-based Object Detection in Adverse Weather using Offset Sequences in Time

no code implementations17 Jan 2024 Raphael van Kempen, Tim Rehbronn, Abin Jose, Johannes Stegmaier, Bastian Lampe, Timo Woopen, Lutz Eckstein

Our findings demonstrate that our novel method, involving temporal offset augmentation through randomized frame skipping in sequences, enhances object detection accuracy compared to both the baseline model (Pillar-based Object Detection) and no augmentation.

Object object-detection +1

SortedAP: Rethinking evaluation metrics for instance segmentation

1 code implementation9 Sep 2023 Long Chen, Yuli Wu, Johannes Stegmaier, Dorit Merhof

Designing metrics for evaluating instance segmentation revolves around comprehensively considering object detection and segmentation accuracy.

Instance Segmentation Object +4

Transformers for CT Reconstruction From Monoplanar and Biplanar Radiographs

no code implementations11 May 2023 Firas Khader, Gustav Müller-Franzes, Tianyu Han, Sven Nebelung, Christiane Kuhl, Johannes Stegmaier, Daniel Truhn

X-rays are widely available and even if the CT reconstructed from these radiographs is not a replacement of a complete CT in the diagnostic setting, it might serve to spare the patients from radiation where a CT is only acquired for rough measurements such as determining organ size.

Computed Tomography (CT)

Cascaded Cross-Attention Networks for Data-Efficient Whole-Slide Image Classification Using Transformers

no code implementations11 May 2023 Firas Khader, Jakob Nikolas Kather, Tianyu Han, Sven Nebelung, Christiane Kuhl, Johannes Stegmaier, Daniel Truhn

However, while the conventional transformer allows for a simultaneous processing of a large set of input tokens, the computational demand scales quadratically with the number of input tokens and thus quadratically with the number of image patches.

Image Classification whole slide images

A Deep Learning-based in silico Framework for Optimization on Retinal Prosthetic Stimulation

no code implementations7 Feb 2023 Yuli Wu, Ivan Karetic, Johannes Stegmaier, Peter Walter, Dorit Merhof

The pre-trained retinal implant model is also a U-Net, which is trained to mimic the biomimetic perceptual model implemented in pulse2percept.

Denoising Diffusion Probabilistic Models for Generation of Realistic Fully-Annotated Microscopy Image Data Sets

1 code implementation2 Jan 2023 Dennis Eschweiler, Rüveyda Yilmaz, Matisse Baumann, Ina Laube, Rijo Roy, Abin Jose, Daniel Brückner, Johannes Stegmaier

Recent advances in computer vision have led to significant progress in the generation of realistic image data, with denoising diffusion probabilistic models proving to be a particularly effective method.

Denoising Segmentation

Medical Diffusion: Denoising Diffusion Probabilistic Models for 3D Medical Image Generation

1 code implementation7 Nov 2022 Firas Khader, Gustav Mueller-Franzes, Soroosh Tayebi Arasteh, Tianyu Han, Christoph Haarburger, Maximilian Schulze-Hagen, Philipp Schad, Sandy Engelhardt, Bettina Baessler, Sebastian Foersch, Johannes Stegmaier, Christiane Kuhl, Sven Nebelung, Jakob Nikolas Kather, Daniel Truhn

Furthermore, we demonstrate that synthetic images can be used in a self-supervised pre-training and improve the performance of breast segmentation models when data is scarce (dice score 0. 91 vs. 0. 95 without vs. with synthetic data).

Computed Tomography (CT) Denoising +3

Semi- and Self-Supervised Multi-View Fusion of 3D Microscopy Images using Generative Adversarial Networks

no code implementations5 Aug 2021 Canyu Yang, Dennis Eschweiler, Johannes Stegmaier

Recent developments in fluorescence microscopy allow capturing high-resolution 3D images over time for living model organisms.

3D fluorescence microscopy data synthesis for segmentation and benchmarking

1 code implementation21 Jul 2021 Dennis Eschweiler, Malte Rethwisch, Mareike Jarchow, Simon Koppers, Johannes Stegmaier

Automated image processing approaches are indispensable for many biomedical experiments and help to cope with the increasing amount of microscopy image data in a fast and reproducible way.

Benchmarking

Robust 3D Cell Segmentation: Extending the View of Cellpose

1 code implementation3 May 2021 Dennis Eschweiler, Richard S. Smith, Johannes Stegmaier

Increasing data set sizes of 3D microscopy imaging experiments demand for an automation of segmentation processes to be able to extract meaningful biomedical information.

Cell Segmentation Instance Segmentation +2

Semi-Automatic Generation of Tight Binary Masks and Non-Convex Isosurfaces for Quantitative Analysis of 3D Biological Samples

1 code implementation30 Jan 2020 Sourabh Bhide, Ralf Mikut, Maria Leptin, Johannes Stegmaier

Current in vivo microscopy allows us detailed spatiotemporal imaging (3D+t) of complete organisms and offers insights into their development on the cellular level.

Cell Segmentation Segmentation

Towards Automatic Embryo Staging in 3D+T Microscopy Images using Convolutional Neural Networks and PointNets

no code implementations1 Oct 2019 Manuel Traub, Johannes Stegmaier

Automatic analyses and comparisons of different stages of embryonic development largely depend on a highly accurate spatiotemporal alignment of the investigated data sets.

Algorithms used for the Cell Segmentation Benchmark Competition at ISBI 2019 by RWTH-GE

no code implementations15 Apr 2019 Dennis Eschweiler, Johannes Stegmaier

The presented algorithms for segmentation and tracking follow a 3-step approach where we detect, track and finally segment nuclei.

Cell Segmentation Clustering +1

The MATLAB Toolbox SciXMiner: User's Manual and Programmer's Guide

no code implementations11 Apr 2017 Ralf Mikut, Andreas Bartschat, Wolfgang Doneit, Jorge Ángel González Ordiano, Benjamin Schott, Johannes Stegmaier, Simon Waczowicz, Markus Reischl

The decision to a Matlab-based solution was made to use the wide mathematical functionality of this package provided by The Mathworks Inc. SciXMiner is controlled by a graphical user interface (GUI) with menu items and control elements like popup lists, checkboxes and edit elements.

Time Series Analysis

New Methods to Improve Large-Scale Microscopy Image Analysis with Prior Knowledge and Uncertainty

no code implementations30 Aug 2016 Johannes Stegmaier

Multidimensional imaging techniques provide powerful ways to examine various kinds of scientific questions.

Fuzzy-based Propagation of Prior Knowledge to Improve Large-Scale Image Analysis Pipelines

no code implementations3 Aug 2016 Johannes Stegmaier, Ralf Mikut

The general concept introduced in this contribution represents a new approach to efficiently exploit prior knowledge to improve the result quality of image analysis pipelines.

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