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GANerated Hands for Real-time 3D Hand Tracking from Monocular RGB [article]

Franziska Mueller, Florian Bernard, Oleksandr Sotnychenko, Dushyant Mehta, Srinath Sridhar, Dan Casas, Christian Theobalt
2017 arXiv   pre-print
We address the highly challenging problem of real-time 3D hand tracking based on a monocular RGB-only sequence. Our tracking method combines a convolutional neural network with a kinematic 3D hand model, such that it generalizes well to unseen data, is robust to occlusions and varying camera viewpoints, and leads to anatomically plausible as well as temporally smooth hand motions. For training our CNN we propose a novel approach for the synthetic generation of training data that is based on a
more » ... ometrically consistent image-to-image translation network. To be more specific, we use a neural network that translates synthetic images to "real" images, such that the so-generated images follow the same statistical distribution as real-world hand images. For training this translation network we combine an adversarial loss and a cycle-consistency loss with a geometric consistency loss in order to preserve geometric properties (such as hand pose) during translation. We demonstrate that our hand tracking system outperforms the current state-of-the-art on challenging RGB-only footage.
arXiv:1712.01057v1 fatcat:7jxgkuoogfbb5itjoq2wbpftpa

Emergence ofBlastoschizomyces capitatusYeast Infections, Central Europe

Tanja Birrenbach, Sonja Bertschy, Franziska Aebersold, Nicolas J. Mueller, Yvonne Achermann, Konrad Muehlethaler, Stefan Zimmerli
2012 Emerging Infectious Diseases  
Mueller, Y. Achermann); and University of Bern, Bern (K. Muehlethaler, S.  ... 
doi:10.3201/eid1801.111192 pmid:22261201 pmcid:PMC3310123 fatcat:n3fi5pz3jnglnecwdlbnnwsonm

Real-time Joint Tracking of a Hand Manipulating an Object from RGB-D Input [article]

Srinath Sridhar, Franziska Mueller, Michael Zollhöfer, Dan Casas, Antti Oulasvirta, Christian Theobalt
2016 arXiv   pre-print
Real-time simultaneous tracking of hands manipulating and interacting with external objects has many potential applications in augmented reality, tangible computing, and wearable computing. However, due to difficult occlusions, fast motions, and uniform hand appearance, jointly tracking hand and object pose is more challenging than tracking either of the two separately. Many previous approaches resort to complex multi-camera setups to remedy the occlusion problem and often employ expensive
more » ... ntation and optimization steps which makes real-time tracking impossible. In this paper, we propose a real-time solution that uses a single commodity RGB-D camera. The core of our approach is a 3D articulated Gaussian mixture alignment strategy tailored to hand-object tracking that allows fast pose optimization. The alignment energy uses novel regularizers to address occlusions and hand-object contacts. For added robustness, we guide the optimization with discriminative part classification of the hand and segmentation of the object. We conducted extensive experiments on several existing datasets and introduce a new annotated hand-object dataset. Quantitative and qualitative results show the key advantages of our method: speed, accuracy, and robustness.
arXiv:1610.04889v1 fatcat:eobmqcu6abc6pjalqy4m3arsze

Convex Optimisation for Inverse Kinematics

Tarun Yenamandra, Florian Bernard, Jiayi Wang, Franziska Mueller, Christian Theobalt
2019 2019 International Conference on 3D Vision (3DV)  
We consider the problem of inverse kinematics (IK), where one wants to find the parameters of a given kinematic skeleton that best explain a set of observed 3D joint locations. The kinematic skeleton has a tree structure, where each node is a joint that has an associated geometric transformation that is propagated to all its child nodes. The IK problem has various applications in vision and graphics, for example for tracking or reconstructing articulated objects, such as human hands or bodies.
more » ... ost commonly, the IK problem is tackled using local optimisation methods. A major downside of these approaches is that, due to the non-convex nature of the problem, such methods are prone to converge to unwanted local optima and therefore require a good initialisation. In this paper we propose a convex optimisation approach for the IK problem based on semidefinite programming, which admits a polynomial-time algorithm that globally solves (a relaxation of) the IK problem. Experimentally, we demonstrate that the proposed method significantly outperforms local optimisation methods using different real-world skeletons.
doi:10.1109/3dv.2019.00043 dblp:conf/3dim/YenamandraBW0T19 fatcat:j4r6e26qjnhrjbg5ncnlkifonm

RGB2Hands: Real-Time Tracking of 3D Hand Interactions from Monocular RGB Video [article]

Jiayi Wang, Franziska Mueller, Florian Bernard, Suzanne Sorli, Oleksandr Sotnychenko, Neng Qian, Miguel A. Otaduy, Dan Casas, Christian Theobalt
2021 arXiv   pre-print
The dense matching encoding (·) is defined analogously to the approach by Mueller et al. Intra-Hand Relative Depth.  ...  The most recent method by [Mueller et al. 2019 ] runs in real time while providing coarse interpenetration avoidance.  ... 
arXiv:2106.11725v1 fatcat:esmiakdncjco3cb6uhdzaqosoq

Rare Occurrence of Small-Bowel Volvulus Following Laparoscopic Appendectomy

Andrea Rossetti, Michel Adamina, Franziska Naef, M. Zadnikar, Sascha A. Mueller
2014 CRSLS MIS Case Reports from SLS  
Laparoscopy has proven to be safe for diagnostic and therapeutic purposes in patients with suspected acute appendicitis. Case Description: We report a case of a rare occurrence of small-bowel volvulus after laparoscopic appendectomy. Discussion: Moreover, laparoscopy has a number of advantages when compared with open surgery, including faster recovery and shorter length of stay. Nevertheless, laparoscopic appendectomy has a dedicated morbidity. A lifethreatening case of small-bowel volvulus
more » ... nd a properly applied surgical staple line is reported.
doi:10.4293/crsls.2014.00162 fatcat:peclx5c4pbaenpmi76kv2jkvta

Rechargeable-hybrid-seawater fuel cell

Jae-Kwang Kim, Franziska Mueller, Hyojin Kim, Dominic Bresser, Jeong-Sun Park, Du-Hyun Lim, Guk-Tae Kim, Stefano Passerini, Youngsik Kim
2014 NPG Asia Materials  
A novel energy conversion and storage system using seawater as a cathode is proposed herein. This system is an intermediate between a battery and a fuel cell, and is accordingly referred to as a hybrid fuel cell. The circulating seawater in this opencathode system results in a continuous supply of sodium ions, which gives this system superior cycling stability that allows the application of various alternative anodes to sodium metal by compensating for irreversible charge losses. Indeed, hard
more » ... rbon and Sn-C nanocomposite electrodes were successfully applied as anode materials in this hybrid-seawater fuel cell, yielding highly stable cycling performance and reversible capacities exceeding 110 mAh g − 1 and 300 mAh g − 1 , respectively.
doi:10.1038/am.2014.106 fatcat:wbua276gkfbzjnvilctn6wjl3i

Deciphering spatio-temporal fluorescence changes using multi-threshold event detection (MTED) [article]

Franziska E Mueller, Volodymyr Cherkas, Gebhard Stopper, Laura C Caudal, Laura Stopper, Frank Kirchhoff, Christian Henneberger, Evgeni G Ponimaskin, Andre Zeug
2020 bioRxiv   pre-print
Recent achievements in indicator optimization and imaging techniques promote the exploration of Ca2+ activity patterns as a main second messenger in many organs. Astrocytes are important regulators of brain activity and well known for their Ca2+-dependent modulation of neurons. However, standardized methods to analyze and interpret Ca2+ activity recordings are missing and hindering global comparisons. Here, we present a biophysics-based concept to analyze Ca2+ signals, which includes multiple
more » ... resholds and provides the experimenter with a comprehensive toolbox for a differentiated and in-depth characterization of Ca2+ signals. We analyzed various ex vivo and in vivo imaging datasets and verify the validity of our multi-threshold event detection (MTED) algorithm across Ca2+ indicators, imaging setups, and model systems from primary cell culture to awake, head-fixed mice. Applying our MTED concept enables standardized analysis and advances research using optical readouts of cellular activity to decrypt brain function. It allowed us to obtain new insights into the complex dependence of Ca2+ activity patterns on temperature and neuronal activity.
doi:10.1101/2020.12.06.413492 fatcat:rn26xsxterfexm62np54eqkwyi

High-resolution phase analyses and early crystallization processes of cement

Moritz-C. Schlegel, Urs Mueller, Ulrich Panne, Franziska Emmerling
2010 Acta Crystallographica Section A Foundations of Crystallography  
Schlegel a , Urs Mueller a , Ulrich Panne a , Franziska Emmerling a . a BAM Federal Institute of Materials Research and Testing, Berlin, Germany Materials Science, Technical University Darmstadt, Germany  ... 
doi:10.1107/s0108767310096017 fatcat:bjmzcphrp5hkdbmkflyg2i4cpy

Implementation of the 2021 molecular ESGO/ESTRO/ESP risk groups in endometrial cancer [article]

Sara Imboden, Denis Nastic, Mehran Ghaderi, Filippa Rydberg, Franziska Siegenthaler, Michael D. Mueller, Tilman T. Rau, Elisabeth Epstein, Joseph W. Carlson
2021 medRxiv   pre-print
Mueller, E. Epstein, 385 J.W. Carlson, Phenotype of POLE-mutated endometrial cancer, PLoS One. (2019). 386 doi:10.1371/journal.pone.0214318. 387 [16] E. Oliva, A. Cheung, S.  ... 
doi:10.1101/2021.03.25.21254244 fatcat:zghjzfsxwngijemkysylrne6ym

Neuropharmacology and Management of Chemotherapy-Induced Nausea and Vomiting in Patients with Breast Cancer

Karin Jordan, Judith Schaffrath, Franziska Jahn, Carsten Mueller-Tidow, Berit Jordan
2014 Breast Care  
/Jordan Breast Care 2014;9:246-253 Jordan/Schaffrath/Jahn/Mueller-Tidow/Jordan Jordan K, Gralla R, Jahn F, Molassiotis A: International antiemetic guidelines on chemotherapy induced nausea and  ...  aprepitant (or fosaprepitant) aprepitant (days 2-3)* Moderate palonosetron + DEX (alternative 5-HT3 RA if palonosetron is not available) Breast Care 2014;9:246-253 Jordan/Schaffrath/Jahn/Mueller-Tidow  ... 
doi:10.1159/000366300 pmid:25404883 pmcid:PMC4209272 fatcat:r35kp5vjwnb3pgbxokhk65sdyu

Cobalt orthosilicate as a new electrode material for secondary lithium-ion batteries

Franziska Mueller, Dominic Bresser, Nathalie Minderjahn, Julian Kalhoff, Sebastian Menne, Steffen Krueger, Martin Winter, Stefano Passerini
2014 Dalton Transactions  
Co2SiO4 is investigated for the first time as lithium-ion active material and a lithium storage mechanism is proposed including the reversible formation of Li4SiO4.
doi:10.1039/c4dt01325e pmid:25043460 fatcat:v3toartkfvb5bjwn3hbigyccvq

Laparoscopic Indocyanine Green Sentinel Lymph Node Mapping in Endometrial Cancer

Andrea Papadia, Sara Imboden, Franziska Siegenthaler, Maria Luisa Gasparri, Stefan Mohr, Susanne Lanz, Michael D. Mueller
2016 Annals of Surgical Oncology  
Background. In endometrial cancer (EMCA), indocyanine green (ICG) sentinel lymph node (SLN) mapping has been reported, mainly in conjunction with robotic surgery. Objective. We aimed to evaluate detection rates, sensitivity, and false negative (FN) rate of laparoscopic ICG SLN mapping in EMCA, and to evaluate differences in surgical outcomes between patients subjected to SLN biopsy only versus lymphadenectomy. Methods. A retrospective analysis of EMCA patients undergoing ICG SLN mapping ±
more » ... (PLND) and/or para-aortic lymphadenectomy (PALND) was performed. Detection rates were calculated for the entire cohort. Sensitivity and FN rates were calculated for patients undergoing lymphadenectomy after SLN mapping, and surgical outcome was compared among patients undergoing SLN mapping only versus lymphadenectomy. Results. Of 75 patients, 33 underwent SLN mapping and 42 underwent SLN mapping followed by PLND/PALND. Overall and bilateral detection rates were 96 % (72/75) and 88 % (66/75), respectively, and the median number of removed SLNs, pelvic non-SLNs (NSLN) and para-aortic NSLNs was 3, 27, and 19, respectively. With a FN rate of 8.3 %, only one patient had bilateral FN SLNs and a metastatic para-aortal NSLN. Estimated blood loss (EBL) and operative (OR) time were significantly lower in patients undergoing SLN mapping only. No differences in complication rates between patients undergoing SLN mapping only and patients undergoing lymphadenectomy were recorded. Conclusions. Laparoscopic ICG SLN mapping has excellent overall and bilateral detection rates and a low FN rate. Compared with lymphadenectomy, SLN biopsy is associated with significantly lower EBL and shorter OR time.
doi:10.1245/s10434-016-5090-x pmid:26790667 pmcid:PMC4889624 fatcat:tjsbime63zfgzp6oiclotjtha4

Real-Time Hand Tracking Under Occlusion from an Egocentric RGB-D Sensor

Franziska Mueller, Dushyant Mehta, Oleksandr Sotnychenko, Srinath Sridhar, Dan Casas, Christian Theobalt
2017 2017 IEEE International Conference on Computer Vision Workshops (ICCVW)  
We present an approach for real-time, robust and accurate hand pose estimation from moving egocentric RGB-D cameras in cluttered real environments. Existing methods typically fail for hand-object interactions in cluttered scenes imaged from egocentric viewpoints-common for virtual or augmented reality applications. Our approach uses two subsequently applied Convolutional Neural Networks (CNNs) to localize the hand and regress 3D joint locations. Hand localization is achieved by using a CNN to
more » ... timate the 2D position of the hand center in the input, even in the presence of clutter and occlusions. The localized hand position, together with the corresponding input depth value, is used to generate a normalized cropped image that is fed into a second CNN to regress relative 3D hand joint locations in real time. For added accuracy, robustness and temporal stability, we refine the pose estimates using a kinematic pose tracking energy. To train the CNNs, we introduce a new photorealistic dataset that uses a merged reality approach to capture and synthesize large amounts of annotated data of natural hand interaction in cluttered scenes. Through quantitative and qualitative evaluation, we show that our method is robust to self-occlusion and occlusions by objects, particularly in moving egocentric perspectives.
doi:10.1109/iccvw.2017.82 dblp:conf/iccvw/MuellerMS0CT17 fatcat:dqdrwatsqfd5vixaxwzw3fr6lu

Deep Brain Recordings Using an Implanted Pulse Generator in Parkinson's Disease

Wolf-Julian Neumann, Franziska Staub, Andreas Horn, Julia Schanda, Joerg Mueller, Gerd-Helge Schneider, Peter Brown, Andrea A. Kühn
2015 Neuromodulation (Malden, Mass.)  
Objectives-Recent studies suggest that oscillatory beta activity could be used as a state biomarker in patients with Parkinson's disease for subthalamic closed-loop stimulation with the intention of improving clinical benefit. Here we investigate the feasibility of subthalamic recordings via a novel chronically implanted pulse generator. Methods-Subthalamic local field potential recordings were obtained from eight patients before and during deep brain stimulation (DBS). All data were analyzed
more » ... the frequency domain using Fourier transform based methods and compared between ON and OFF stimulation conditions. Results-Distinct peaks of oscillatory beta band activity were found in 12 of 15 electrodes. DBS induced a significant frequency specific suppression of oscillatory beta activity (p = 0.002). Conclusion- The results of the study suggest that oscillatory beta band synchronization and it's modulation by DBS is recordable with a system suitable for chronic implantation and may serve as a biomarker for subthalamic closed-loop stimulation in patients with Parkinson's disease.
doi:10.1111/ner.12348 pmid:26387795 pmcid:PMC4881811 fatcat:y5xdt4eacjdchkujakwxqo6q5e
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