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Displaying 1-50 out of 52 total
An Augmented Reality System for Astronomical Observations
Found in: Virtual Reality Conference, IEEE
By Andrei Lintu, Marcus Magnor
Issue Date:March 2006
pp. 119-126
Anyone who has gazed through the eyepiece of an astronomical telescope knows that, with the exception of the Moon and the planets, extra-solar astronomical objects are disappointing to observe visually. This is mainly due to their low surface brightness, b...
 
Reconstructing the Geometry of Flowing Water
Found in: Computer Vision, IEEE International Conference on
By Ivo Ihrke, Bastian Goldluecke, Marcus Magnor
Issue Date:October 2005
pp. 1055-1060
We present a recording scheme, image formation model and reconstruction method that enables image-based modeling of flowing bodies of water from multi-video input data. The recorded water is dyed with a fluorescent chemical to measure the thickness of a co...
 
Synthetic Generation of High-Dimensional Datasets
Found in: IEEE Transactions on Visualization and Computer Graphics
By Georgia Albuquerque,Thomas Löwe,Marcus Magnor
Issue Date:December 2011
pp. 2317-2324
Generation of synthetic datasets is a common practice in many research areas. Such data is often generated to meet specific needs or certain conditions that may not be easily found in the original, real data. The nature of the data varies according to the ...
 
Shape: A 3D Modeling Tool for Astrophysics
Found in: IEEE Transactions on Visualization and Computer Graphics
By Wolfgang Steffen, Nicholas Koning, Stephan Wenger, Christophe Morisset, Marcus Magnor
Issue Date:April 2011
pp. 454-465
We present a flexible interactive 3D morpho-kinematical modeling application for astrophysics. Compared to other systems, our application reduces the restrictions on the physical assumptions, data type, and amount that is required for a reconstruction of a...
 
Interactive Visualization and Simulation of Astronomical Nebulae
Found in: Computing in Science & Engineering
By Stephan Wenger,Marco Ament,Wolfgang Steffen,Nico Koning,Daniel Weiskopf,Marcus Magnor
Issue Date:May 2012
pp. 78-87
Interactive visualization and simulation of astrophysical phenomena help astronomers and enable digital planetariums and television documentaries to take their spectators on a journey into deep space to explore the astronomical wonders of our universe in 3...
 
Constrained example-based audio synthesis
Found in: Multimedia and Expo, IEEE International Conference on
By Stephan Wenger,Marcus Magnor
Issue Date:July 2011
pp. 1-6
Music and sound play an important role for the emotional involvement of the spectator in visual media such as movies, video games or artistic shows. However, the generation of suitable background music and atmospheric sound matching the visual context is a...
 
Motion Field Estimation from Alternate Exposure Images
Found in: IEEE Transactions on Pattern Analysis and Machine Intelligence
By Anita Sellent, Martin Eisemann, Bastian Goldlücke, Daniel Cremers, Marcus Magnor
Issue Date:August 2011
pp. 1577-1589
Traditional optical flow algorithms rely on consecutive short-exposed images. In this work, we make use of an additional long-exposed image for motion field estimation. Long-exposed images integrate motion information directly in the form of motion-blur. W...
 
Automated Analytical Methods to Support Visual Exploration of High-Dimensional Data
Found in: IEEE Transactions on Visualization and Computer Graphics
By Andrada Tatu, Georgia Albuquerque, Martin Eisemann, Peter Bak, Holger Theisel, Marcus Magnor, Daniel Keim
Issue Date:May 2011
pp. 584-597
Visual exploration of multivariate data typically requires projection onto lower dimensional representations. The number of possible representations grows rapidly with the number of dimensions, and manual exploration quickly becomes ineffective or even unf...
 
A Fast and Robust Approach to Lane Marking Detection and Lane Tracking
Found in: Image Analysis and Interpretation, IEEE Southwest Symposium on
By Christian Lipski, Bjorn Scholz, Kai Berger, Christian Linz, Timo Stich, Marcus Magnor
Issue Date:March 2008
pp. 57-60
We present a lane detection algorithm that robustly detects and tracks various lane markings in real-time. The first part is a feature detection algorithm that transforms several input images into a top view perspective and analyzes local histograms. For t...
 
A Simple Framework for Natural Animation of Digitized Models
Found in: Graphics, Patterns and Images, SIBGRAPI Conference on
By Edilson de Aguiar, Rhaleb Zayer, Christian Theobalt, Hans-Peter Seidel, Marcus Magnor
Issue Date:October 2007
pp. 3-10
We present a versatile, fast and simple framework to generate animations of scanned human characters from input optical motion capture data. Our method is purely mesh-based and requires only a minimum of manual interaction. The only manual step needed to c...
 
Seeing People in Different Light-Joint Shape, Motion, and Reflectance Capture
Found in: IEEE Transactions on Visualization and Computer Graphics
By Christian Theobalt, Naveed Ahmed, Hendrik Lensch, Marcus Magnor, Hans-Peter Seidel
Issue Date:July 2007
pp. 663-674
<p><b>Abstract</b>—By means of passive optical motion capture, real people can be authentically animated and photo-realistically textured. To import real-world characters into virtual environments, however, surface reflectance properties ...
 
Global Depth from Epipolar Volumes--A General Framework for Reconstructing Non-Lambertian Surfaces
Found in: 3D Data Processing Visualization and Transmission, International Symposium on
By Timo Stich, Art Tevs, Marcus Magnor
Issue Date:June 2006
pp. 916-923
Using Epipolar Image Analysis in the context of the correspondence finding problem in depth reconstruction has several advantages. One is the elegant incorporation of prior knowledge about the scene or the surface reflection properties into the reconstruct...
 
Reflection Nebula Visualization
Found in: Visualization Conference, IEEE
By Marcus A. Magnor, Kristian Hildebrand, Andrei Lintu, Andrew J. Hanson
Issue Date:October 2005
pp. 33
Stars form in dense clouds of interstellar gas and dust. The residual dust surrounding a young star scatters and diffuses its light, making the star's
 
Reconstruction and Visualization of Planetary Nebulae
Found in: IEEE Transactions on Visualization and Computer Graphics
By Marcus Magnor, Gordon Kindlmann, Charles Hansen, Neb Duric
Issue Date:September 2005
pp. 485-496
From our terrestrially confined viewpoint, the actual three-dimensional shape of distant astronomical objects is, in general, very challenging to determine. For one class of astronomical objects, however, spatial structure can be recovered from conventiona...
 
Constrained Inverse Volume Rendering for Planetary Nebulae
Found in: Visualization Conference, IEEE
By Marcus Magnor, Gordon Kindlmann, Charles Hansen
Issue Date:October 2004
pp. 83-90
Determining the three-dimensional structure of distant astronomical objects is a challenging task, given that terrestrial observations provide only one viewpoint. For this task, bipolar planetary nebulae are interesting objects of study because of their pr...
 
M^3: Marker-Free Model Reconstruction and Motion Tracking from 3D Voxel Data
Found in: Computer Graphics and Applications, Pacific Conference on
By Edilson de Aguiar, Christian Theobalt, Marcus Magnor, Holger Theisel, Hans-Peter Seidel
Issue Date:October 2004
pp. 101-110
In computer animation, human motion capture from video is a widely used technique to acquire motion parameters. The acquisition process typically requires an intrusion into the scene in the form of optical markers which are used to estimate the parameters ...
 
Spacetime-Coherent Geometry Reconstruction from Multiple Video Streams
Found in: 3D Data Processing Visualization and Transmission, International Symposium on
By Marcus Magnor, Bastian Goldlücke
Issue Date:September 2004
pp. 365-372
By reconstructing time-varying geometry one frame at a time, one ignores the continuity of natural motion, wasting useful information about the underlying video-image formation process and taking into account temporally discontinuous reconstruction results...
 
Space-Time Isosurface Evolution for Temporally Coherent 3D Reconstruction
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By Bastian Goldluecke, Marcus Magnor
Issue Date:July 2004
pp. 350-355
We model the dynamic geometry of a time-varying scene as a 3D isosurface in space-time. The intersection of the isosurface with planes of constant time yields the geometry at a single time instant. An optimal fit of our model to multiple video sequences is...
 
Enhancing Silhouette-Based Human Motion Capture with 3D Motion Fields
Found in: Computer Graphics and Applications, Pacific Conference on
By Christian Theobalt, Joel Carranza, Marcus A. Magnor, Hans-Peter Seidel
Issue Date:October 2003
pp. 185
<p>High-quality non-intrusive human motion capture is necessary for acquistion of model-based free-viewpoint video of human actors. Silhouette-based approaches have demonstrated that they are able to accurately recover a large range of human motion f...
 
A Graphics Hardware Implementation of the Generalized Hough Transform for fast Object Recognition, Scale, and 3D Pose Detection
Found in: Image Analysis and Processing, International Conference on
By Robert Strzodka, Ivo Ihrke, Marcus Magnor
Issue Date:September 2003
pp. 188
The generalized Hough transform constitutes a well-known approach to object recognition and pose detection. To attain reliable detection results, however, a very large number of candidate object poses and scale factors need to be considered. In this paper ...
 
Joint 3D-Reconstruction and Background Separation in Multiple Views using Graph Cuts
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By Bastian Goldlücke, Marcus A. Magnor
Issue Date:June 2003
pp. 683
This paper deals with simultaneous depth map estimation and background separation in a multi-view setting with several fixed calibrated cameras, two problems which have previously been addressed separately. We demonstrate that their strong interdependency ...
 
Capturing the Shape of a Dynamic World - Fast !
Found in: Shape Modeling and Applications, International Conference on
By Marcus Magnor, Hans-Peter Seidel
Issue Date:May 2003
pp. 3
Acquiring on-line the evolving shape of a dynamic scene from a handful of video streams may be considered one of the most challenging, but at the same time also most auspicious tasks in contemporary computer graphics and computer vision research. The antic...
 
Interactive Rendering of Translucent Objects
Found in: Computer Graphics and Applications, Pacific Conference on
By Hendrik P.A. Lensch, Michael Goesele, Philippe Bekaert, Jan Kautz, Marcus A. Magnor, Jochen Lang, Hans-Peter Seidel
Issue Date:October 2002
pp. 214
This paper presents a rendering method for translucent objects, in which view point and illumination can be modified at interactive rates. In a preprocessing step the impulse response to incoming light impinging at each surface point is computed and stored...
 
Combining 2D Feature Tracking and Volume Reconstruction for Online Video-Based Human Motion Capture
Found in: Computer Graphics and Applications, Pacific Conference on
By Christian Theobalt, Marcus Magnor, Pascal Schüler, Hans-Peter Seidel
Issue Date:October 2002
pp. 96
The acquisition of human motion data is of major importance for creating interactive virtual environments, intelligent user interfaces, and realistic computer animations. Today?s performance of off-the-shelf computer hardware enables marker-free non-intrus...
 
Geometry-based Automatic Object Localization and 3-D Pose Detection
Found in: Image Analysis and Interpretation, IEEE Southwest Symposium on
By Marcus A. Magnor
Issue Date:April 2002
pp. 0144
Given the image of a real-world scene and a polygonal 3-D model of a depicted object, its apparent size, image coordinates, and 3-D orientation are autonomously detected. Based on matching silhouette outline to edges in the image, an extensive search in pa...
 
Cost volume-based interactive depth editing in stereo post-processing
Found in: Proceedings of the 10th European Conference on Visual Media Production (CVMP '13)
By Kai Ruhl, Marcus Magnor, Martin Eisemann
Issue Date:November 2013
pp. 1-6
In the post production of a stereoscopic visual media production, high-quality depth or disparity maps are essential for a number of workflow components, from initial layer separation, over editing transfers, to the final depth compositing. With automatic ...
     
Sparse localized deformation components
Found in: ACM Transactions on Graphics (TOG)
By Christian Theobalt, Marcus Magnor, Kiran Varanasi, Markus Wacker, Stephan Wenger, Thomas Neumann
Issue Date:November 2013
pp. 1-10
We propose a method that extracts sparse and spatially localized deformation modes from an animated mesh sequence. To this end, we propose a new way to extend the theory of sparse matrix decompositions to 3D mesh sequence processing, and further contribute...
     
Integrating approximate depth data into dense image correspondence estimation
Found in: Proceedings of the 9th European Conference on Visual Media Production (CVMP '12)
By Christian Lipski, Felix Klose, Kai Ruhl, Marcus Magnor
Issue Date:December 2012
pp. 26-31
High-quality dense image correspondence estimation between two images is an essential prerequisite for many tasks in visual media production, one prominent example being view interpolation. Due to the ill-posed nature of the correspondence estimation probl...
     
High detail marker based 3D reconstruction by enforcing multiview constraints
Found in: ACM SIGGRAPH 2012 Posters (SIGGRAPH '12)
By Christian Theobalt, Kiran Varanasi, Marcus Magnor, Markus Wacker, Thomas Neumann
Issue Date:August 2012
pp. 1-1
We present a 3D reconstruction method enabling high resolution marker-based capturing of deforming surfaces. In contrast to previous work, we allow all markers to look exactly the same and do not rely on temporal tracking. This implies considerable advanta...
     
Single-trial EEG classification of artifacts in videos
Found in: ACM Transactions on Applied Perception (TAP)
By Marcus Magnor, Maryam Mustafa, Stefan Guthe
Issue Date:July 2012
pp. 1-15
In this article we use an ElectroEncephaloGraph (EEG) to explore the perception of artifacts that typically appear during rendering and determine the perceptual quality of a sequence of images. Although there is an emerging interest in using an EEG for ima...
     
Evaluation of video artifact perception using event-related potentials
Found in: Proceedings of the ACM SIGGRAPH Symposium on Applied Perception in Graphics and Visualization (APGV '11)
By Lea Lindemann, Marcus Magnor, Stephan Wenger
Issue Date:August 2011
pp. 53-58
When new computer graphics algorithms for image and video editing, rendering or compression are developed, the quality of the results has to be evaluated and compared. Since the produced media are usually to be presented to an audience it is important to p...
     
Space-time visual effects as a post-production process
Found in: Proceedings of the 1st international workshop on 3D video processing (3DVP '10)
By Christian Linz, Christian Lipski, Christian Theobalt, Lorenz Rogge, Marcus Magnor
Issue Date:October 2010
pp. 1-6
Space-time visual effects play an increasingly prominent role in recent motion picture productions as well as TV commercials. Currently, these effects must be meticulously planned before extensive, specialized camera equipment can be precisely positioned a...
     
Photo zoom: high resolution from unordered image collections
Found in: ACM SIGGRAPH 2010 Posters (SIGGRAPH '10)
By Elmar Eisemann, Hans-Peter Seidel, Marcus Magnor, Martin Eisemann
Issue Date:July 2010
pp. 1-1
We present a system to automatically construct high resolution images from an unordered set of low resolution photos. It consists of an automatic preprocessing step to establish correspondences between any given photos. The user may then choose one image a...
     
Multi-image interpolation based on graph-cuts and symmetric optical flow
Found in: ACM SIGGRAPH 2010 Posters (SIGGRAPH '10)
By Christian Linz, Christian Lipski, Marcus A. Magnor
Issue Date:July 2010
pp. 1-1
Multi-image interpolation in space and time has recently received considerable attention. Typically, the interpolated image is synthesized by adaptively blending several forward-warped images. Blending itself is a low-pass filtering operation: the interpol...
     
Belief propagation optical flow for high-resolution image morphing
Found in: ACM SIGGRAPH 2010 Posters (SIGGRAPH '10)
By Christian Linz, Christian Lipski, Marcus Magnor
Issue Date:July 2010
pp. 1-1
Over the last decade, considerable progress has been made on the so-called early vision problems. We present an optical flow algorithm for image morphing that incorporates recent advances in feature matching, energy minimization, stereo vision and image se...
     
Predictive rendering
Found in: ACM SIGGRAPH ASIA 2009 Courses (SIGGRAPH ASIA '09)
By Alan Chalmers, Alexander Wilkie, Andrea Weidlich, Marcus Magnor
Issue Date:December 2009
pp. 1-428
This course intends to serve two closely related purposes: to provide an accurate definition of the term "predictive rendering" and to present the technological foundations for research in this area. The first goal of the course (a clear definition of the ...
     
A ghosting artifact detector for interpolated image quality assessment
Found in: Proceedings of the 6th Symposium on Applied Perception in Graphics and Visualization (APGV '09)
By Anita Sellent, Christian Linz, Christian Lipski, Kai Berger, Marcus Magnor
Issue Date:September 2009
pp. 128-128
We present a no-reference image quality metric for image interpolation. The approach is capable of detecting ghosting artifacts, e.g., in image based rendering scenarios. Based on the assumption that ghosting artifacts can be detected locally, the perceive...
     
Virtual video camera: image-based viewpoint navigation through space and time
Found in: SIGGRAPH '09: Posters (SIGGRAPH '09)
By Christian Linz, Christian Lipski, Kai Berger, Marcus Magnor
Issue Date:August 2009
pp. 1-1
We present an image-based rendering system to viewpoint-navigate through space and time of complex real-world, dynamic scenes. Our approach accepts unsynchronized, uncalibrated multi-video footage as input. Inexpensive, consumer-grade camcorders suffice to...
     
3D reconstruction of planetary nebulae using hybrid models
Found in: SIGGRAPH '09: Posters (SIGGRAPH '09)
By Christophe Morisset, Marcus Magnor, Stephan Wenger, Wolfgang Steffen
Issue Date:August 2009
pp. 1-1
Distant astrophysical objects like planetary nebulae can normally only be observed from a single point of view, which makes deducing plausible 3D models a hard task that usually involves a lot of manual work [Nadeau et al. 2001]. However, additional physic...
     
Time-resolved 3d capture of non-stationary gas flows
Found in: ACM Transactions on Graphics (TOG)
By Art Tevs, Bradley Atcheson, Derek Bradley, Hans-Peter Seidel, Ivo Ihrke, Marcus Magnor, Wolfgang Heidrich
Issue Date:December 2008
pp. 1-49
Fluid simulation is one of the most active research areas in computer graphics. However, it remains difficult to obtain measurements of real fluid flows for validation of the simulated data. In this paper, we take a step in the direction of capturing flow ...
     
Perception-motivated interpolation of image sequences
Found in: Proceedings of the 5th symposium on Applied perception in graphics and visualization (APGV '08)
By Christian Linz, Christian Wallraven, Douglas Cunningham, Marcus Magnor, Timo Stich
Issue Date:August 2008
pp. 113-118
We present a method for image interpolation which is able to create high-quality, perceptually convincing transitions between recorded images. By implementing concepts derived from human vision, the problem of a physically correct image interpolation is re...
     
Image morphing for space-time interpolation
Found in: ACM SIGGRAPH 2007 posters on XX (SIGGRAPH '07)
By Marcus Magnor, Timo Stich
Issue Date:August 2007
pp. 181-es
The human brain automatically attempts to interpret the physical visual inputs from our eyes in terms of plausible motion of the viewpoint and/or of the observed object or scene [Ellis 1938; Graham 1965; Giese and Poggio 2003]. In the physical world, the r...
     
Image morphing for space-time interpolation
Found in: ACM SIGGRAPH 2007 sketches on XX (SIGGRAPH '07)
By Marcus Magnor, Timo Stich
Issue Date:August 2007
pp. 87-es
The human brain automatically attempts to interpret the physical visual inputs from our eyes in terms of plausible motion of the viewpoint and/or of the observed object or scene [Ellis 1938; Graham 1965; Giese and Poggio 2003]. In the physical world, the r...
     
GPU-based light wavefront simulation for real-time refractive object rendering
Found in: ACM SIGGRAPH 2007 sketches on XX (SIGGRAPH '07)
By Art Tevs, Christian Theobalt, Gernot Ziegler, Hans-Peter Seidel, Ivo Ihrke, Marcus Magnor
Issue Date:August 2007
pp. 54-es
In our paper on Eikonal Rendering [1], presented in the SIGGRAPH 2007 main paper program, we propose a novel algorithm to render a variety of sophisticated lighting effects in and around refractive objects in real-time on a single PC. Our method enables us...
     
Imaging and 3D tomographic reconstruction of time-varying, inhomogeneous refractive index fields
Found in: ACM SIGGRAPH 2007 sketches on XX (SIGGRAPH '07)
By Bradley Atcheson, Derek Bradley, Hans-Peter Seidel, Ivo Ihrke, Marcus Magnor, Wolfgang Heidrich
Issue Date:August 2007
pp. 32-es
Time varying, inhomogeneous refractive index fields are every-where, from hot air rising above a fire and mirages above hot roads in the summer, to gases flowing from pressurized containers, and mixtures of different liquids. We present a novel method for ...
     
Eikonal rendering: efficient light transport in refractive objects
Found in: ACM Transactions on Graphics (TOG)
By Art Tevs, Christian Theobalt, Gernot Ziegler, Hans-Peter Seidel, Ivo Ihrke, Marcus Magnor
Issue Date:July 2007
pp. 1-35
We present a new method for real-time rendering of sophisticated lighting effects in and around refractive objects. It enables us to realistically display refractive objects with complex material properties, such as arbitrarily varying refractive index, in...
     
Beyond one perspective: using video camera arrays for graphics
Found in: Material presented at the ACM SIGGRAPH 2006 conference (SIGGRAPH '06)
By Bennett Wilburn, Marcus Magnor
Issue Date:July 2006
pp. 7-es
Capture, analysis, and rendering of dynamic, real-world scenes and phenomena using multiple video cameras. This course describes hardware, calibration, and algorithms. Topics include modeling dynamic geometry and volumetric phenomena (such as smoke and fir...
     
Automatic generation of personalized human avatars from multi-view video
Found in: Proceedings of the ACM symposium on Virtual reality software and technology (VRST '05)
By Christian Theobalt, Edilson de Aguiar, Hans-Peter Seidel, Marcus Magnor, Naveed Ahmed
Issue Date:November 2005
pp. 257-260
In multi-user virtual environments real-world people interact via digital avatars. In order to make the step from the real world onto the virtual stage convincing the digital equivalent of the user has to be personalized. It should reflect the shape and pr...
     
Video-based rendering
Found in: ACM SIGGRAPH 2005 Courses (SIGGRAPH '05)
By Christian Theobalt, German Cheung, Marc Pollefeys, Marcus Magnor, Wojciech Matusik
Issue Date:July 2005
pp. 1-es
In Madagascar, crowds here created using PDI/Dream Works' proprietary mob system. The mob system allows a large crowd to be built by combining a small number of cycle-based animations with small numbers of character types, body types, hair/fur styles, clot...
     
Image-based tomographic reconstruction of flames
Found in: Proceedings of the 2004 ACM SIGGRAPH/Eurographics symposium on Computer animation (SCA '04)
By Ivo Ihrke, Marcus Magnor
Issue Date:August 2004
pp. 365-373
Non-invasively determining the three-dimensional structure of real flames is a challenging task. We present a tomographic method for reconstructing a volumetric model from multiple images of fire. The method is similar to sparse-view computerized tomograph...
     
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