417 Works

Natural Language Interfaces for Data Analysis with Visualization: Considering What Has and Could Be Asked

Arjun Srinivasan & John T. Stasko
Natural language is emerging as a promising interaction paradigm for data analysis with visualization. Designing and implementing Natural Language Interfaces (NLIs) is a challenging task, however. In addition to being able to process and understand natural language expressions, NLIs for data visuailzation must consider other factors including input modalities, providing input affordances, and explaining system results, among others. In this article, we examine existing NLIs for data analysis with visualization, and compare and contrast them...

Pairwise Matching of Stone Tools Based on Flake-Surface Contour Points and Normals

Yang Xi, Katsutsugu Matsuyama & Kouichi Konno
Stone tools constitute the main artifacts facilitating archaeological research of the Paleolithic era. The reassembly of stone tools is the most important research work for analyzing human activities of that period. In recent decades, large numbers of methods have been presented to solve various registration or matching problems for point clouds; however, few methods have been successfully applied to the matching of flakes, a type of stone tool. Therefore, we propose a new matching method...

Detail Highlighting using a Shadow Edge Histogram

Anastasios Gkaravelis & Georgios Papaioannou
In this paper we propose a simple and effective technique for setting up a configuration of directional light sources to accentuate the prominent geometric features of complex objects by increasing the local shadow contrast near them. Practical applications of such a task are encountered among others in professional photography, and cinematography. The method itself, which is based on a voting mechanism, quickly produces consistent and view-independent results, with minimal user intervention.

Procedural Generation of Natural Environments with Restrictions

Cristina Gasch, Miguel Chover & Inmaculada Remolar
Natural environments are a very important part of virtual worlds, both for video games and for simulators, but their manual creation can be a very expensive job. The procedural creation of these, allows to generate them easily and quickly, although there is no way to control the final result quickly and accurately. The purpose of this work is to present a new method of creation, that allows the procedural generation of a natural environment for...

Retrieval of Surfaces with Similar Relief Patterns

S. Biasotti, E. Moscoso Thompson, M. Aono, A. Ben Hamza, B. Bustos, S. Dong, B. Du, A. Fehri, H. Li, F. A. Limberger, M. Masoumi, M. Rezaei, I. Sipiran, L. Sun, A. Tatsuma, S. Velasco Forero, R. C. Wilson, Y. Wu, J. Zhang, T. Zhao, F. Fornasa & A. Giachetti
This paper presents the results of the SHREC'17 contest on retrieval of surfaces with similar relief patterns. The proposed task was created in order to verify the possibility of retrieving surface patches with a relief pattern similar to an example from a database of small surface elements. This task, related to many real world applications, requires an effective characterization of local "texture" information not depending on patch size and bending. Retrieval performances of the proposed...

C++ Compile Time Polymorphism for Ray Tracing

Stefan Zellmann & Ulrich Lang
Reducing the amount of conditional branching instructions in innermost loops is crucial for high performance code on contemporary hardware architectures. In the context of ray tracing algorithms, typical examples for branching in inner loops are the decisions what type of primitive a ray should be tested against for intersection, or which BRDF implementation should be evaluated at a point of intersection. Runtime polymorphism, which is often used in those cases, can lead to highly expressive...

Evaluating and Comparing Game-controller based Virtual Locomotion Techniques

Bhuvaneswari Sarupuri, Simon Hoermann, Mary C. Whitton & Robert W. Lindeman
The incremental hardware costs of virtual locomotion are minimized when the technique uses interaction capabilities available in controllers and devices that are already part of the VE system, e.g., gamepads, keyboards, and multi-function controllers. We used a different locomotion technique for each of these three devices: gamepad thumb-stick (joystick walking), a customized hybrid keyboard for gaming (speedpad walking), and an innovative technique that uses the orientation and triggers of the HTC Vive controllers (TriggerWalking). We...

3D Annotation Transfer

Andreas Scalas, Michela Mortara & Michela Spagnuolo
In the last few years, there has been an increase in digitalization efforts within the Cultural Heritage field, which boosted the interest for new strategies to improve documentation standards. While these concepts have been largely studied for most of the CH content types, 3D data still need to be fully worked out as document types. One of the most innovative methods to glue the documentation (i.e. the semantics) of the artifacts to their geometry is...

Setting up Virtual Geographic Environments in Unity

Karsten Rink, Lars Bilke & Olaf Kolditz
We propose a setup for presenting complex heterogenous environmental data in a Virtual Reality environment. After a number of pre-processing steps required to integrate various data sets in a unified context, our workflow uses the Unity engine in combination with MiddleVR to create interactive applications for Virtual Reality environments to support research and evaluation for case studies containing domain-specific data from environmental monitoring and modelling. Typical challenges are described when handling such data in a...

3D Reconstruction of Facade and the Statues of the Church ''Maria Santissima dell'Elemosina'' in Biancavilla

Simone Federico Tomasello & Miriam Caterina Pazzi
3D modelling plays a key role in the reconstruction of cultural heritage assets. It allows to give an idea of the original condition of a cultural heritage before time and weathering effects. This paper presents the 3D reconstruction of the church ''Maria Santissima dell'Elemosina'' through various software for modelling, as well as the acquisition and processing of elements. High resolution photos has been employed for faithful reproduction of the models details.

Molecular Visualization of Computational Biology Data: A Survey of Surveys

Naif Alharbi, Mohammad Alharbi, Xavier Martinez, Michael Krone, Alexander S. Rose, Marc Baaden, Robert S. Laramee & Matthieu Chavent
Visualizations for computational biology have been developing for over 50 years. With recent advances in both computational biology and computer graphics techniques, these fields have witnessed rapid technological advances in the last decade. Thus, coping with the large number of scientific articles from both fields is a challenging task. Furthermore, there remains a gap between the two communities of visualization and computational biology, resulting in additional challenges to bridge the divide. A team of computational...

Visualization of ERT Data for Archaeological Purposes

Paulo Bernardes, Mafalda Alves, Bruno Pereira, Joaquim Madeira, Manuela Martins & Luis Fontes
This work presents a visualization methodology for the correct comprehension and interpretation of ERT data by archaeologists. The authors developed a methodology based not only in colour mapping and slicing techniques but also on contouring and interaction procedures, obtaining an alternative to the traditional 2D pseudosection data visualization workflows. The implementation was carried out with the Visualization Toolkit from Kitware Inc. and is illustrated using two data samples: the first one was obtained on a...

A Unified Process for Visual-Interactive Labeling

Jürgen Bernard, Matthias Zeppelzauer, Michael Sedlmair & Wolfgang Aigner
Assigning labels to data instances is a prerequisite for many machine learning tasks. Similarly, labeling is applied in visualinteractive analysis approaches. However, the strategies for creating labels often differ in the two fields. In this paper, we study the process of labeling data instances with the user in the loop, from both the machine learning and visual-interactive perspective. Based on a review of differences and commonalities, we propose the 'Visual-Interactive Labeling' (VIAL) process, conflating the...

Schrödinger Operator for Sparse Approximation of 3D Meshes

Yoni Choukroun, Gautam Pai & Ron Kimmel
We introduce a Schrödinger operator for spectral approximation of meshes representing surfaces in 3D. The operator is obtained by modifying the Laplacian with a potential function which defines the rate of oscillation of the harmonics on different regions of the surface. We design the potential using a vertex ordering scheme which modulates the Fourier basis of a 3D mesh to focus on crucial regions of the shape having high-frequency structures and employ a sparse approximation...

Declarative Spatial Reasoning for Intelligent Cinematography

Mehul Bhatt, Carl Schultz, Jakob Suchan & Przemyslaw Walega
We present computational visuo-spatial representation and reasoning from the viewpoint of the research areas of artificial intelligence, spatial cognition and computation, and human-computer interaction. The particular focus is on demonstrating recent advances in the theory and practice of spatial reasoning, and its significance and potential as a foundational AI method for (intelligent) computational cinematography & editing systems.

La Caméra Enchantée

Jarek Rossignac
A rich set of tools have been developed for designing and animating camera motions. Most of them optimize some geometric measure while satisfying a set of geometric constraints. Others strive to provide an intuitive graphical user interface for manipulating the camera motion or the key poses that control it. We will start by reviewing examples of such tools developed by the speaker and his collaborators and students. These include a 6 DoF GUI for moving...

An Inclusive Approach to Digital Heritage: Preliminary Achievements Within the INCEPTION Project

Federica Maietti, Marco Medici & Emanuele Piaia
At the end of the second year of activity and after having completed the first steps in the development of its main goals, the project "INCEPTION - Inclusive Cultural Heritage in Europe through 3D Semantic Modelling" is now facing different challenging actions starting from already developed advancement in 3D data capturing. Semantic modelling for Cultural Heritage buildings in H-BIM environment and the development of the INCEPTION platform for deployment and valorisation of enriched 3D models...

Bone Fracture and Lesion Assessment using Shape-Adaptive Unfolding

Hannes Martinke, Christian Petry, Stefan Großkopf, Michael Suehling, Grzegorz Soza, Bernhard Preim & Gabriel Mistelbauer
The assessment of rib bone fractures and lesions consists of many images that have to be thoroughly inspected slice-by-slice and rib-by-rib. Existing visualization methods, such as curved planar reformation (CPR), reduce the number of images to inspect and, in turn, the time spent per case. However, this task remains time-consuming and exhausting. In this paper, we propose a novel rib unfolding strategy that considers the cross-sectional shape of each rib individually and independently. This leads...

Data Painter: A Tool for Colormap Interaction

Omniah H. Nagoor, Rita Borgo & Mark W. Jones
The choice of a mapping from data to color should involve careful consideration in order to maximize the user understanding of the underlying data. It is desirable for features within the data to be visually separable and identifiable. Current practice involves selecting a mapping from predefined colormaps or coding specific colormaps using software such as MATLAB. The purposes of this paper are to introduce interactive operations for colormaps that enable users to create more visually...

Challenges in Appearance Capture and Predictive Modeling of Textile Materials

Carlos Castillo, Carlos Aliaga & Jorge López-Moreno
The appearance of cloth is the result of complex light interactions within the structures present in textile materials, particularly challenging due to their multi-scale nature. In addition to the inherent complexity of cloth rendering, there is a lack of connection between computer graphics techniques and manufacturing processes followed in industry. We discuss existing techniques and pose questions about which are the right paths to follow for a better synergy between CG and textile research, including...

The ArchAIDE Project: Results and Perspectives After the First Year

Francesco Banterle, Matteo Dellepiane, Tim Evans, Gabriele Gattiglia, Barak Itkin & Massimo Zallocco
The ArchAIDE project is a Horizon 2020 project that has the main goal to digitally support the day-to-day operations on the field of archaeologists. This allows them to reduce time and costs of delivering an accurate and quick classification of ancient pottery artifacts. To effectively reach such ambitious goal, the project has several sub-goals: (semi-)automatic digitalization of archaeological catalogs, a mobile app to be used on site for live classification of sherds with the generation...

Visual Analysis of Geolocated Echo Chambers in Social Media

Michael Hundt, Bruno Schneider, Mennatallah El-Assady, Daniel A. Keim & Alexandra Diehl
In news media, echo chambers refer to situations in which information is amplified or reinforced by communication and repetition. The characteristic of an echo chamber is, therefore, the absence of controversial discussions and a narrow set of opinions about a topic. We propose the use of Visual Analytics to describe spatiotemporal distributions of echo chambers using Twitter data, for specific geolocated events, such as concerts, strikes, demonstrations, etc. We analyze the echo chambers for Boston...

Registration Year

  • 2017