609 Works

Photon Splatting Using a View-Sample Cluster Hierarchy

Pierre Moreau, Erik Sintorn, Viktor Kämpe, Ulf Assarsson & Michael Doggett
Splatting photons onto primary view samples, rather than gathering from a photon acceleration structure, can be a more efficient approach to evaluating the photon-density estimate in interactive applications, where the number of photons is often low compared to the number of view samples. Most photon splatting approaches struggle with large photon radii or high resolutions due to overdraw and insufficient culling. In this paper, we show how dynamic real-time diffuse interreflection can be achieved by...

Accelerating Point Cloud Cleaning

Rickert L. Mulder & Patrick Marais
A laser scanning campaign to capture the geometry of a large heritage site can produce thousands of high resolution range scans. These must be cleaned to remove noise and artefacts. To accelerate the cleaning task, we can i) reduce the time required for batch-processing tasks, ii) reduce user interaction time, or iii) replace interactive tasks with more efficient automated algorithms. We present a point cloud cleaning framework that attempts to improve each of these aspects....

Ordering Triangles in Triangulated Terrains Over Regular Grids

Jesús Alonso & Robert Joan-Arinyo
In this work we report on a set of rules to visit triangles in triangulated height fields defined over regular grids in a back-to- front order with respect to an arbitrary viewpoint. With the viewpoint, we associate an axis-alligned local reference framework. Projections on the XY plane of the local axis and the bisector of the first and third quadrants define six sectors. Specific visiting rules for collections of triangles that project on each sector...

Mesh Saliency Analysis via Local Curvature Entropy

Max Limper, Arjan Kuijper & Dieter W. Fellner
We present a novel approach for estimating mesh saliency. Our method is fast, flexible, and easy to implement. By applying the well-known concept of Shannon entropy to 3D mesh data, we obtain an efficient method to determine mesh saliency. Comparing our method to the most recent, state-of-the-art approach, we show that results of at least similar quality can be achieved within a fraction of the original computation time. We present saliency-guided mesh simplification as a...

A General Micro-flake Model for Predicting the Appearance of Car Paint

Serkan Ergun, Sermet Önel & Aydin Ozturk
We present an approximate model for predicting the appearance of car paint from its paint composition. Representing the appearance of car paint is not trivial because of its layered structure which is composed of anisotropic scattering media. The Radiative Transfer Equation (RTE) is commonly used to represent the multiple scattering for the underlying structures. A number of techniques including the Monte Carlo approach, the discrete ordinates, the adding-doubling method, the Eddington approximation, as well as...

Visual Monitoring of Photovoltaic Systems

Jannis Harder, Patrick Riehmann, Stefan Wörfel, Tobias Krause & Bernd Froehlich
We developed a scalable visual analytics framework for managing and analyzing hundreds of geographically distributed photovoltaic systems. These systems deliver performance parameters at different levels as well as environmental parameters. Our web-based framework gathers the data in a central server and allows comparisons of production values across time and photovoltaic systems, analysis of component failures and reporting errors. It is in daily use by a regional energy provider for over one year and its capabilities...

Shape Adaptive Cut Lines

Matteo Colaianni, Christian Siegl, Jochen Süßmuth, Franz Rott & Günther Greiner
We present a novel method to express base layer and compression garments directly coupled to a human body geometry. Our system enables the transfer of a previously defined patch configuration from a virtual template avatar to arbitrary input bodies. A complete pipeline for the virtual development of second skin garments is presented. The system's strength is the transparent usage for two important scenarios in the apparel industry. On the one hand grading for a population...

Understanding Networks beyond Overlapping Clusters

Vladimir Guchev, S. Angelini & G. Amati
Tasks associated with the investigation of large complex clustered networks are widespread in various research areas. Among the popular and common approaches to exploratory analysis, it is definitely worthwhile to underscore the node-link-based graph visualization. However, despite the prevalence of node-link-based tools, its graphic design and geometric representation of topology almost invariably formed by a spontaneous spatial structure, or on the contrary, by a too rigidly ordered arrangement. Transformation possibilities of multivariate data structures may...

Surface Reconstruction from Range Images

Gianfranco Mariosa, Nicola Fioraio, Alessandro Franchi & Luigi Di Stefano
In this work we propose an algorithm for fast and detailed surface reconstruction from range images. Our method extends the well-known Ball Pivoting Algorithm (BPA) so to exploit the inherent structure of range images, outperforming the state-of-theart both in terms of reconstruction quality and computation time. Moreover, we have investigated on automatic estimation of the algorithm's parameters and, in particular, we propose a novel robust approach to estimate the sequence of radii required by BPA,...

Icosahedral Maps for a Multiresolution Representation of Earth Data

Mohammad Imrul Jubair, Usman Alim, Niklas Röber, John Clyne & Ali Mahdavi-Amiri
The icosahedral non-hydrostatic (ICON) model is a digital Earth model based on an icosahedral representation and used for numerical weather prediction. In this paper, we introduce icosahedral maps that are designed to fit the geometry of different cell configurations in the ICON model. These maps represent the connectivity information in ICON in a highly structured two-dimensional hexagonal representation that can be adapted to fit different cell configurations. Our maps facilitate the execution of a multiresolution...

Image Based Bio-CAD Modeling and Its Applications to Biomedical and Tissue Engineering

B. Starly, A. Darling, C. Gomez, J. Nam, , W. Sun , A. Shokoufandeh & W. Regli
CAD has been traditionally used to assist in engineering design and modeling for representation, analysis and manufacturing. Advances in Information Technology and in Biomedicine have created new uses for CAD with many novel and important biomedical applications, particularly in tissue engineering in which the CAD based bio-tissue informatics model provides critical information of tissue biological, biophysical, and biochemical properties for modeling, design, and fabrication of complex tissue substitutes. This paper will present some salient advances...

Gloss Editing in Light Fields

Yulia Gryaditskaya, Belen Masia, Piotr Didyk, Karol Myszkowski & Hans-Peter Seidel
With the improvement of both acquisition techniques, and computational and storage capabilities, we are witnessing an increasing presence of multidimensional scene representations. Two-dimensional, conventional images are gradually losing their hegemony, leaving room for novel formats. Among these, light fields are gaining importance, further propelled by the recent reappearance of virtual reality. Content generation is one of the stumbling blocks in this realm, and light fields are one of the main input sources of content. As...

Exploring and Expanding the Continuum of OIT Algorithms

Chris Wyman
Order independent transparency (OIT) proves challenging for modern rasterization-based renderers. Rendering without transparency can limit the quality of visual effects, so researchers have proposed various algorithms enabling and approximating OIT. Unfortunately, this work generally has restrictions limiting its applicability. To identify directions for improvement, we performed an in-depth categorization of existing transparency techniques and placed them on a multi-dimensional continuum. This categorization shows how prior published techniques relate to each other and highlights unexposed parts...

CompaRing: Reducing Costs of Visual Comparison

Christian Tominski
Comparison is a frequent task when analyzing data. In visualization, comparison tasks are naturally carried out based on a visual representation of the data. Visual comparison allows us to gain insight where plain computations of numerical differences alone cannot grasp the complex interdependencies in the data. Yet, visual comparison also comes at a cost. There are costs when interpreting the visual representation and costs when interactively carrying out the comparison.We present techniques to reduce some...

Automatic Display Zoom Using Face Size of Camera Image

Yuki Satale & Kenji Funahashi
When it is hard to see a small font size document that is in your hand, you usually move it closer to your face. When you want to see the whole of a large sheet such as a map, you usually get it away from your face. On the other hand when you get into a same situation on a PC screen and tablet device, you zoom it using a mouse or doing pinch operation....

Towards Multi-user Provenance Tracking of Visual Analysis Workflows over Multiple Applications

Claudia Hänel, Mohammad Khatami, Torsten W. Kuhlen & Benjamin Weyers
Provenance tracking for visual analysis workflows is still a challenge as especially interaction and collaboration aspects are poorly covered in existing realizations. Therefore, we propose a first prototype addressing these issues based on the PROV model. Interactions in multiple applications by multiple users can be tracked by means of a web interface and, thus, allowing even for tracking of remote-located collaboration partners. In the end, we demonstrate the applicability based on two use cases and...

ICAT-EGVE 2016- Posters and Demos: Frontmatter

Tom Coffin, Gabriel Zachmann, Akihiko Shirai, Regis Kopper & Pedro Morillo

Real-time Simulation of Large Elasto-Plastic Deformation with Shape Matching

Nuttapong Chentanez, Matthias Müller & Miles Macklin
Shape matching is a popular method for simulating deformable objects in real time as it is fast and stable at large time steps. Although shape matching can simulate large elastic deformation and ductile fracturing, until now, they are limited to scenarios with relatively small plastic deformation. In this work, we present a method for simulating deformable solids undergoing large plastic deformation and topological changes using shape matching within the position based dynamics (PBD) framework. This...

Using Icicle Trees to Encode the Hierarchical Structure of Source Code

Ivan Bacher, Brian Mac Namee & John D. Kelleher
This paper presents a study which evaluates the use of a tree visualisation (icicle tree) to encode the hierarchical structure of source code. The tree visualisation was combined with a source code editor in order to function as a compact overview to facilitate the process of comprehending the global structure of a source code document. Results from our study show that providing an overview visualisation led to an increase in accuracy and a decrease in...

Efficient 3D Content Creation using Point Sampled Geometry

Markus Gross
In recent years, point primitives have received a growing attention in computer graphics. The emergence of affordable 3D scanning devices along with the demand for ever more geometric detail has created the need to efficiently process and display very large point sampled models. At data sizes where triangle based methods approach their limits, point representations feature a variety of advantages. Since points provide a discretization of geometry without explicit storage of topology, they enable us...

Terracotta Reassembly from Fragments Based on Surface Ornamentation Adjacency Constraints

Yuhe Zhang, Guohua Geng, Xiaoran Wei & Shunli Zhang
This paper introduces a method that enables the reassembly of fragments with incompleteness in fracture surfaces and break-curves. The incompleteness of the fracture surfaces and break-curves, both contribute to the failure of all previous geometry-driven techniques for reassembly of 3D objects. The proposed method is preferable because it depends on the surface ornamentation-the structured feature lines, which are often complete and can provide enough surface adjacency constraints. Finally, we demonstrate the benefits of our method...

Painted Stained Glass

Lars Doyle & David Mould
We propose a new region-based method for stained glass rendering of an input photograph. We achieve more regular region sizes than previous methods by using simple linear iterative clustering, or SLIC, to obtain tile boundaries. The SLIC regions respect image edges but provide an oversegmentation suitable for stained glass. We distinguish between important boundaries that match image edges, and unimportant boundaries that do not; we then resegment regions with unimportant boundaries to create more regular...

Manifold Visualization via Short Walks

Yang Zhao, Sotirios Tasoulis & Teemu Roos
Visualizing low-dimensional non-linear manifolds underlying high-dimensional data is a challenging data analysis problem. Different manifold visualization methods can be characterized by the associated definitions of proximity between highdimensional data points and score functions that lead to different low-dimensional embeddings, preserving different features in the data. The geodesic distance is a popular and well-justified metric. However, it is very hard to approximate reliably from finite samples especially between far apart points. In this paper, we propose...

Interactive Web-based Visualization for Accessibility Mapping of Transportation Networks

Alexander Schoedon, Matthias Trapp, Henning Hollburg & Jürgen Döllner
Accessibility is a fundamental aspect in transportation, routing, and spare-time activity planning concerning traveling in modern cities. In this context, interactive web-based accessibility-map visualization techniques and systems are important tools for provisioning, exploration, analysis, and assessment of multi-modal and location-based travel time data and routing information. To enable their effective application, such interactive visualization techniques demands for flexible mappings with respect to user-adjustable parameters such as maximum travel times, the types of transportation used, or...

Is This Seat Taken? Behavioural Analysis of the Telethrone: A Novel Situated Telepresence Display

John O'Hare, Robert C. A. Bendall, John Rae, Graham Thomas, Bruce Weir & David J. Roberts
We present research with two novel components; a system which may improve current small group telecommunication, and an experiment to test the efficacy. Telethrone projects a remote user onto a chair, bringing them into your space. The chair acts as a situated display which can support multi party head gaze, eye gaze, and body torque such that each observer knows where the projected user is looking. It is simpler to implement and cheaper than current...

Registration Year

  • 2016
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