Italian Chapter Conference 2007

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https://diglib.eg.org/handle/10.2312/911

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3D Objects Face Clustering using Unsupervised Mean Shift
(The Eurographics Association, 2007) Farenzena, M.; Cristani, M.; Castellani, U.; Fusiello, A.; Raffaele De Amicis and Giuseppe Conti
In this paper, a novel approach to face clustering is proposed. The aim is the completely unsupervised extraction of planes in a polygonal a mesh, obtained from a 3D reconstruction process. In this context, 3D coordinates points are inevitably affected by error, therefore resiliency is a primal concern in the analysis. The method is based on the Mean Shift clustering paradigm, devoted to separating modes of a multimodal non-parametric density, by using a kernel-based technique. A critical parameter, the kernel bandwidth size, is here automatically detected by following a well-accepted partition stability criterion. Experimental and comparative results on synthetic and real data validate the approach.
3D Scene Comparison using Topological Graphs
(The Eurographics Association, 2007) Paraboschi, L.; Biasotti, S.; Falcidieno, B.; Raffaele De Amicis and Giuseppe Conti
New technologies for shape acquisition and rendering of digital shapes have simplified the process of creating virtual scenes; nonetheless, shape annotation, recognition and manipulation of both the complete virtual scenes and even of subparts of them are still open problems. In this paper we deal with the problem of comparing two (or more) object sets, where each model is represented by an attributed graph. We will define a new distance to estimate the possible similarities among the sets of graphs and will validate our work using the shape graph [BGSF06].
Benefits of Innovative Technologies for "Territorial Communication": the Case of Study "Virtual Museum Net of Magna Graecia"
(The Eurographics Association, 2007) Bertacchini, P. A.; Dell'Accio, A.; Mallamaci, L.; Pantano, E.; Raffaele De Amicis and Giuseppe Conti
Territorial communication aims at giving visibility and recognizability to a particular territory by emphasizing its distinctive aspects. It does not only supply information, but it has also a persuasive function, exciting interest and curiosity in the message receivers. In this vision, the use of innovative communication channels, such as Webbased Geographical Information Systems, as well as multimedia technologies and three-dimensional graphics, could be very effective. In this paper we introduce a case of study, the "Virtual Museum Net of Magna Graecia", a system in which technologies offer original procedures for the fruition of Calabrian Cultural Heritage.
"Beyond the desktop, Out of the Office..." Designing Interactive Graphics Applications for Mobile Devices
(The Eurographics Association, 2007) Chittaro, Luca; Raffaele De Amicis and Giuseppe Conti
The recent availability of increasingly powerful PDAs and mobile phones is making it possible to develop new applications based on interactive (2D as well as 3D) graphics. However, limitations of mobile devices and the peculiar needs of users on-the-go require a careful design of applications that are specifically thought for mobile devices and users [Chi06]. Mobile graphics applications become even more innovative and provide functionalities that were unavailable on desktop systems when they are integrated with various sensors (e.g., GPS, accelerometers, heart rate monitors, pulseoximeters, ...) that allow one to adapt the behavior of the application according to position in space (location-awareness) and other parameters (context-awareness). In this way, the mobile device becomes able to choose what to draw and how to draw it on the display based on what is happening to the user as well as the physical world that surrounds her. Moreover, the data recorded by mobile sensors about the behavior of users on the move lends itself to the design of visualizations that can be important in domains such as health care, urban planning, geomarketing, emergency management, and others. This invited talk will first discuss why and how mobile graphics applications require to be approached differently from traditional ones. Then, it will demonstrate some new mobile applications that have been developed in domains as diverse as tourism, health and fitness, navigation, and architectural visualization. Finally, it will deal with the visualization of mobile users' behaviors by showing two different tools we have recently proposed [CRI06, NC07].
Bringing the Semantics into Digital Shapes: the AIM@SHAPE Approach
(The Eurographics Association, 2007) Falcidieno, Bianca; Raffaele De Amicis and Giuseppe Conti
This presentation describes the main objectives and achievements of the European Network of Excellence AIM@SHAPE. This NoE is aimed to advance research in the direction of semantic-based shape representations and tools able to acquire, build, transmit and process shapes with their associated knowledge. Acting on a multi-disciplinary research field, AIM@SHAPE deeply integrates geometry processing, computer graphics and vision with knowledge technologies. The core of the integration resides in the homogenisation of the approach to modelling shapes and their associated semantics using knowledge formalisation mechanisms: metadata and ontology. A main objective is also to develop an innovative e-science platform for modelling, processing and sharing digital shapes, called the Digital Shape Workbench (DSW). Through the definition of general and specific shape ontologies, the DSW is a framework able to store shapes, tools, and publications along with the knowledge related to them.
Challenges for modern Scene-Graph Systems
(The Eurographics Association, 2007) Mueller-Wittig, Wolfgang; Voss, Gerrit; Raffaele De Amicis and Giuseppe Conti
Current scenegraph systems, especially systems used to build general purpose virtual reality systems, are trailing game engines and similar specialized systems in terms of the adaption of new renderingmethods like the different real-time shadow algorithms. This paper analysis the fundamental OpenGL state abstraction layers present in current scenegraph systems with respect to their influence on the adaption of new and complex rendering algorithms.
Collaborative Visualization of Sensor Data Through a Subscription based Architecture
(The Eurographics Association, 2007) Witzel, M.; Andreolli, M.; Conti, G.; Amicis, R. De; Araújo, B. De; Jota, R.; Jorge, J.; Raffaele De Amicis and Giuseppe Conti
In this paper we propose a collaborative prototype for the integration of Geographical Information System (GIS) sensor data into a distributed architecture for Virtual Reality. Sensor data of various origin and classified domains are provided using a topic subscription metaphor. A graphical editor, which allows creation/ import/export/manipulation of sensor data, serves as a real-time administrative interface to control the provision of topics/sensorial data and, at the same time, it is used as an interface to common GIS applications. A client application, responsible for the rendering, decides according to the context which data (timevarying, static) is relevant for the actual examination. Additionally, terrain cultures like forests, buildings, streets along with their geometrical and semantical attributes are provided by using queries to a Web Feature Service/PostGIS Database and translated to a 3D representation. These queries are broadcasted to all clients in the framework to assure at all times synchronicity of the examination data. Finally Session Management is enabled by storing the messages in a relational database to achieve persistency and recalling of the analysis process.
Daily Life in the Middle Ages - Parma in the Cathedral Age
(The Eurographics Association, 2007) Guidazzoli, Antonella; Ponti, Francesca Delli; Raffaele De Amicis and Giuseppe Conti
This experience is the result of a close interaction between computer science and historical studies. Technological knowledge and new tools for virtual reconstruction are not sufficient for Cultural Heritage philological works, but a close collaboration with historical experts is very important since the knowledge of both sciences have to work together in order for people to understand past civilizations. The aim of this exhibition is to improve the perception of events in the Middle Ages.
The Dance of the Air: a Case Study in Interactive Digital Art
(The Eurographics Association, 2007) Cuoghi, E.; Gherardi, R.; Toldo, R.; Raffaele De Amicis and Giuseppe Conti
This paper describes the conception and realization of an interactive art installation called The Dance of the Air . The whole process is taken as a case study for the different challenges encounteredduring the implementation of the system. The project is followed from the seminal idea to the artistic specifications, the translation into technical requirements and the final deployment step.
Developing a Virtual Training System in Aeronautical Industry
(The Eurographics Association, 2007) Gironimo, G. Di; Guida, M.; Raffaele De Amicis and Giuseppe Conti
The paper deals with the developing of a virtual training system to be implemented in an aeronautic company. The strength of the training method based on the use of Virtual Reality is the high degree of interactivity that it is possible to obtain in a virtual environment. In fact, unlike the traditional methods based on classroom lessons supported by slides and videos that only allow a passive participation of the users to the training, Virtual Reality, with its immersive environments, allows the students both to visualize realistically the contents of the lesson, and to interact with the represented objects. According to that, thanks to the collaboration with Alenia, one of the most important Italian companies in the aeronautical field, we elaborated an innovative virtual training methodology, named AVIRA, specifically dedicated to the users working with composed materials. For the development of this system we started from a real case regarding a particular production process of a specific component. The considered production process is the stratification/lamination of carboresin, used for the fabrication of aeronautical components of high technological content, that is currently active at Alenia Aeronautica in Foggia.
Dynamic Rail Inspection by Vision System
(The Eurographics Association, 2007) Cerniglia, D.; Nigrelli, V.; Prior, F.; Raffaele De Amicis and Giuseppe Conti
Current in-field rail track ultrasonic inspection technologies, requiring contact between the probes and the rail surface, show limitations as defect detection is affected by rail surface condition, rail head geometry and defect geometry and orientation. Moreover, inspection speeds are moderate. To improve rail flaw detection, the partnership of the U-Rail project - within the sixth EU framework programme - proposes a new non-contact ultrasonic inspection system, consisting of a pulsed laser and air-coupled transducers. For a proper positioning, the inspection unit includes a laser optic triangulation unit and an automatic positioning system. The first determines the position of the rail, processes the data and drives the positioning system. The U-Rail system allows high speed inspection of the complete rail section. The paper describes the system and results of research activities of two U-Rail partners.
An Efficient Algorithm for Adaptive Segmentation and Tessellation with Pixel Precision
(The Eurographics Association, 2007) Martinelli, Alessandro; Raffaele De Amicis and Giuseppe Conti
We propose a new algorithm to get a representation of a curved surface with the precision of the image pixel. This technique uses some results from Scan-line algorithms, but it considers also the new functionalities from graphics hardware and takes advantages from it. We explain the general method, with principles common to every kind of surface: then we illustrate how these principles can be applied to quadratic and cubic bezier triangles, showing formulas and some algorithm details.
Explicit Adaptive Tessellation based on re-parametrization on Graphics Hardware
(The Eurographics Association, 2007) Martinelli, Alessandro; Raffaele De Amicis and Giuseppe Conti
We propose to use an explicit function for adaptive tessellation of parametric curves and surfaces. This function behaves as a new parametrization from the surface domain (or curve domain) to the domain itself; it is build using information about derivatives and curvature: a fixed tessellation may be re-arranged in an adaptive tessellation, which takes care of those parts of the curve or surface which need to be tessellated more and those which may use a poorer tessellation. We show how to produce and how to use the kernel function with four example: a simple cubic curve, a spline curve, a cubic bezièr triangle and a cubic quadrilateral patch. For every example, we compare the fixed tessellation with the adaptive one: the number of vertexes used is always the same, but the points are re-arranged in a better way. At the end we show how to use commonly known forward differencing methods to evaluate both the explicit parametrization and the curve or surface; we also show how simply this method may be implemented on common graphics cards.
Flexible Multimodal Architecture for CAD Application
(The Eurographics Association, 2007) Dellisanti, M.; Fiorentino, M.; Monno, G.; Uva, A. E.; Raffaele De Amicis and Giuseppe Conti
Multimodal interfaces are proved to increase the input\output bandwidth for a more efficient interaction in 3D activities. This work presents a novel framework designed to simplify the configuration procedures and to provide a high level of flexibility in multimodal interfaces. We propose an innovative system architecture to decouple input and output configuration from the application level and a multimodal engine designed to manage and synchronize the different inputs. The flexibility of the system is ensured by the use of a hierarchical XML-based configuration structure. This framework can be applied to test the advantage of multimodal interfaces in VRAD applications and provides tools to explore the synergy of different input\output techniques
Form Features in Non-manifold Shapes: A First Classification and Analysis
(The Eurographics Association, 2007) Crovetto, Chiara; Floriani, Leila De; Giannini, Franca; Raffaele De Amicis and Giuseppe Conti
During the industrial design process, a product model undergoes several analyses. One of the most common ones is the finite element analysis. This kind of analysis needs a simplified model, which can include idealised parts, and thus it is usually non-manifold and non-regular. During the idealisation process, the semantic information attached to the CAD model, such as features or surface types, or information used for model simplification, e.g. assumptions on the behavior type, is usually lost, thus making more difficult re-using, or, at least taking advantage, of performed simulations and models. This would be made easier if a meaningful interpretation of the object subparts is available. To this aim, in this paper, we provide a taxonomy of form features in non-manifold shapes and we describe an approach for their identification based on a decomposition of a non-manifold shapes into uniformly dimensional components proposed in [DHH06]. The process presented is the first step towards the identification of form features, since it analyzes those features containing non-manifold singularities.
Human Robot Interaction in Virtual Reality
(The Eurographics Association, 2007) Gironimo, G. Di; Marzano, A.; Tarallo, A.; Raffaele De Amicis and Giuseppe Conti
In this paper, we describe a framework which helps designers visualize and verify the results of robotic work cell simulation in a Virtual Environment (VE). The system aims at significantly reducing production costs and error sources during manufacturing processes. The means to achieve these goals are the development of a prototypical VE for the support of robots planning tasks, reuse of animation events, and the implementation of customization tools for animation elements and their behavior. By using advanced Virtual Reality (VR) techniques, the system is also able to direct the focus of the observer to interesting events, objects and time-frames during robotic simulations in order to highlight the Human Robot Interaction within the manufacturing systems.
ImaginationTOOLS (TM)- A 3D Environment for Learning and Playing Music
(The Eurographics Association, 2007) Bilotta, E.; Pantano, P.; Bertacchini, F.; Gabriele, L.; Longo, G.; Mazzeo, V.; Rizzuti, C.; Talarico, A.; Tocci, G.; Vena, S.; Raffaele De Amicis and Giuseppe Conti
In this paper, we present ImaginationTOOLS, a software which uses mathematical models to generate, analyse and synthesize sound and music. User learns in an imaginary 3D-city basic concepts on mathematical models and music by interacting with pedagogical agents; composes in a laboratory room using a manipulatory agent-like interface; listens to music in an immersive room and creates interactive music with ad-hoc designed instruments and performs and shares music on the net. It represents a real advancement on the existing similar scientificallyoriented products available on the market and it is considered a fusion of different music and multimedia technologies, with a strong developmental trend into physical interaction design. It is the first software using 3D interaction in a 3D environment to produce sound and music, extending the potential of musicians by experimenting in the psycho-acoustical domain of sound and overcoming the problems of musical education, with simple interface.
Marker-less Real-time Camera Registration for Mixed Reality
(The Eurographics Association, 2007) Liverani, Alfredo; Grandi, Stefania; Raffaele De Amicis and Giuseppe Conti
A real-time and robust algorithm for 3D camera registration in a Mixed Reality (MR) environment is described in this paper. The most used technique for camera pose (position and orientation with respect to a fixed or moving object) is based on fiducial marker tracking. This method guarantees good results in real-time with a single camera, but needs several high contrast printed markers on external world in order to make possible the calculation of camera parameters and positioning. Thus real 3D geometric data are grabbed only through already known markers. The aim of this research is a real-time monocular camera tracking and registration through automatic image features extraction from video streaming. The first implementation of the method, several examples and confrontation with non interactive algorithm for SFM (Structure From Motion) have demonstrated that this meets the real-time response and sufficient precision needed by a Mixed Reality environment.
Medical Visualization with New Generation Spatial 3D Displays
(The Eurographics Association, 2007) Agus, Marco; Bettio, Fabio; Gobbetti, Enrico; Pintore, Giovanni; Raffaele De Amicis and Giuseppe Conti
In this paper the capabilities of a modern spatial 3D display are exploited for medical visualization tasks. The systemgives multiple viewers the illusion of seeing virtual objects floating at fixed physical locations. The usage of this kind of display in conjunction with 3D visualization techniques helps disambiguating complex images, so it is proven to be a real advantage for immediate understanding and visualization of medical data.We demonstrate this by reporting on some preliminary test cases of direct volume rendering techniques (Maximum Intensity Projection and X Ray simulation), as well as an example of a collaborative medical diagnostic application for analysis of Abdominal Aortic Aneurysms.
Methods for Spatial Data Quality of 3D City Models
(The Eurographics Association, 2007) Krämer, Michel; Haist, Jörg; Reitz, Thorsten; Raffaele De Amicis and Giuseppe Conti
3D city models are nowadays used in very different applications. Due to this, the commercial exchange and, thus, the demand for high quality data becomes more and more important. We describe a quality model that defines common parameters used for spatial quality measurement, especially when dealing with 3D city models. Therefore, we explore different representations of city models: the reality, the user's idea and the digital data set. A welldefined mathematical formalism which addresses the different quality parameters is presented. This formalism also helps to create algorithms for measurement and improvement of spatial data quality. The aim is to be able to define uniformed criteria which can be easily transformed into software. The implemented prototype serves as base for the evaluation in which we provide examples based on actual data sets using typical quality requirements.

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