Claudio Montani

Claudio Montani
Italian National Research Council | CNR · Institute of Information Science and Technology "Alessandro Faedo" ISTI

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90
Publications
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4,639
Citations

Publications

Publications (90)
Article
Full-text available
The paper presents the results of a 3D scanning campaign which sampled both the exterior facades of an ancient Basilica in Torcello (Venice, Italy) and some key elements of its interior. The targets of our scanning project were selected to be representative of different subjects, requiring different digital sampling technologies. We have used a ran...
Article
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In this paper we describe the virtual reconstruction of a dismantled and dispersed piece of art: the Funerary Complex of Arrigo VII. To faithfully reconstruct the monument, all of the statues and elements of the mausoleum have been acquired in digital 3D format; then, with advanced computer graphics techniques, some of the accredited reconstructing...
Article
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The paper presents the guidelines of the CENOBIUM project and the first results on the capitals of the cloister of Monreale (Sicily). The CENOBIUM project aims at demonstrating the strength of the integration of modern representation and analysis technologies in the context of the knowledge, documentation and fruition of 3D cultural heritage. The w...
Article
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Producing good quality 3D scanning models which encode color sampling is still a complex task. The acquisition of surface properties, such as the apparent color, is often decoupled from the acquisition of the geometry, leading to data defined in different reference systems. A common situation is to have several pictures of the scanned object with n...
Article
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The construction of detailed and accurate 3D mod- els is made easier by the increasing diffusion of D scanning devices. These allow to build accurate digital models of real 3D objects in a cost- and time-effective manner. The talk will present the capabilities of this technology focusing mainly on some issues which are preventing its wider use, suc...
Article
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We present a methodology, based on 3D scanned digital models, for measurement and monitoring wood deformations, caused by weather changes, in the trees of the fossilized Dunarobba forest. The Dunarobba forest, located in the central part of Italy, was discovered recently after some excavations to dig clay for bricks manufacturing. The removal of th...
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The paper presents a set of combined techniques to enhance the real-time visualization of simple or complex molecules (up to order of 106 atoms) space fill mode. The proposed approach includes an innovative technique for efficient computation and storage of ambient occlusion terms, a small set of GPU accelerated procedural impostors for space-fill...
Conference Paper
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In recent years the progress of D scanning technologies and the consequent growing commercialization of scan- ners opened a large spectrum of opportunities for many professionals. In particular, architects and engineers may access to a digital model of a building without having to model it using a CAD software. On the other hand, there are two impo...
Article
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Bone drilling is a fundamental task in several surgical procedures, including mastoidectomy, cochlear implanta- tion, orbital surgery. It consists in eroding the part of the bone in contact with the tip of the surgical tool when a sufficient pressure is exerted. Since the bone is an almost rigid material, the bone drilling simulations usually emplo...
Article
This chapter is dedicated to fast extraction of one or more isosurfaces from a structured or unstructured volume dataset by means of a drastic reduction of the visited cells. In particular, the chapter shows how the interval tree data structure-an optimally efficient search data structure to retrieve intervals of the real line that contain a given...
Article
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This paper proposes a novel technique to speed up the registration of 2D images to 3D models. This problem often arises in the process of digitalization of real objects, because pictures are often taken independently from the 3D geometry. Although there are a number of methods to solve the prob- lem of registration automatically, they all need some...
Article
Abstract Range map registration is still the most time consuming phase in the processing of 3D scanning data. This is because real scanning sets are composed of hundreds of range maps and their registration is still partially manual. We propose a new method to manage complex scan sets acquired by following a regular scanner pose pattern. Our goal i...
Article
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A new prospective for the study, documentation and presentation of Cultural Heritage is opened by the joint usage of the tools for the automatic reconstruction of digital 3D models and the instruments for interactive 3D visualization. New techniques are available to perform high-resolution sampling of both the shape and the multi-band reflection pr...
Article
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Refurbishing Michelangelo's David has produced several useful restoration guidelines. These guidelines can help restorers select the proper procedures for the task and, objectively, assess the results. The work also has helped us develop innovative ways to process and visualize 3D data in cultural heritage projects. The David restoration was an ide...
Article
A new shape-from-silhouette algorithm for the creation of 3D digital models is presented. The algorithm is based on the use of the Marching Intersection (MI) data structure, a volumetric scheme which allows efficient representation of 3D polyhedra and reduces the boolean operations between them to simple boolean operations on linear intervals. MI s...
Article
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Standard texture mapping of real-world meshes suffers from the presence of seams that need to be introduced in order to avoid excessive distortions and to make the topology of the mesh compatible to the one of the texture domain. In contrast, cube maps provide a mechanism that could be used for seamless texture mapping with low distortion, but only...
Article
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The program of scientific investigations planned in the framework of the restoration of Michelangelo's David produced several useful guidelines for defining and developing innovative ways to process and visualize 3D data in cultural heritage applications. Our ultimate goal was to include 3D graphics among the tools which can help restorers select t...
Article
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A new algorithm for the integration of partially overlapping range images into a triangular mesh is presented. The algorithm consists of three main steps: it locates the intersections between the range surfaces and a reference grid chosen by the user, then merges all nearly coincident and redundant intersections according to a proximity criterion,...
Conference Paper
Full-text available
The results of a project aimed to the study, reconstruction and presentation to the public of a monument disassembled and dispersed, the mausoleum of the emperor Arrigo VII, are presented here. We used modern 3D graphics for the acquisition of accurate digital models of all the elements of the funerary complex, to draw hypothesis on its original ar...
Conference Paper
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Graffiti is a special form of art which gives us important knowledge on culture and social life of a lost civilization. Unfortunately, they are usually engraved on soft and non durable materials. The project described here originated from the request for a new approach to the preservation, study and ubiquitous access to Pompei's graffiti. A multidi...
Article
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Very large triangle meshes, i.e., meshes composed of millions of faces, are becoming common in many applications. Obviously, processing, rendering, transmission, and archiving of these meshes are not simple tasks. Mesh simplification and LOD management are a rather mature technology that, in many cases, can efficiently manage complex data. But, onl...
Article
How to render very complex datasets, and yet maintain interactive response times, is a hot topic in computer graphics. The MagicSphere idea originated as a solution to this problem, but its potential goes much further than this original scope. In fact, it has been designed as a very generical 3D widget: it defines a spherical volume of interest in...
Conference Paper
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Post-processing of 3D scanned data is still the bottleneck for a wider diffusion of this technology. In this paper we describe our second generation tools for processing 3D scanned data. In particular, our tools support: range maps alignment, range maps merge (or fusion), mesh simplification and color attribute management. This software package has...
Article
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A new system for the construction of highly realistic models of real free-form 3D objects is pro- posed, based on the integration of several techniques (automatic 3D scanning, inverse illumination, inverse texture-mapping and textured 3D graphics).Our system improves the quality of a D model (e.g. acquired with a range scanning device) by adding co...
Article
A solution is proposed to the problem of interactive visualization and rendering of volume data. Designed for parallel distributed memory MIMD architectures, the volume rendering system is based on the ray tracing (RF) visualization technique, the Sticks rep- resentation scheme (a data structure exploiting data coherence for the compression of clas...
Article
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A parallel solution to the visualisation of high resolution vol- ume data is presented. Based on the ray tracing (RT) visu- alization technique, the system works on a distributed memory MIMD architecture. A hybrid strategy to ray tracing parallelization is applied, using ray dataflow within an image partition approach. This strategy allows the flex...
Conference Paper
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A new shape-from-silhouette algorithm for the cre- ation of 3D digital models is presented. The al- gorithm is based on the use of the Marching In- tersection (MI) data structure, a volumetric scheme which allows efficient representation of 3D poly- hedra and reduces the boolean operations between them to simple boolean operations on linear inter-...
Article
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This paper presents the initial results of the "Minerva Project" obtained by means of two different 3D scanning techniques. The Minerva of Arezzo is a bronze statue (Archaeological Museum in Florence) currently under restoration. The "Minerva project" intends to show how 3D techniques can integrate standard diagnostic methods giving useful and powe...
Article
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Automatic 3D acquisition devices (often called 3D scanners) allow to build highly accurate models of real 3D objects in a cost- and time-effective manner. We have experimented this technology in a particular application context: the acquisition of Cultural Heritage artefacts. Specific needs of this domain are: medium-high accuracy, easy of use, aff...
Article
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The paper presents a simple and efficient algorithm for the removal of small topological inconsistencies and high frequency details from surface models. The method, called Marching Intersections (MI), adopts a volumetric approach and acts as a resampling filter: all the intersection points between the input model and the lines of a user selected 3D...
Article
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Multiresolution representations are widely used in many visualization contexts and applications, since they provide optimal management of the data representation by using at each time instant a level of detail most appropriate for the application requirements. Unfortunately, current solutions do not allow the topology of the object to be changed, a...
Conference Paper
Full-text available
The paper presents a simple and efficient algorithm for the removal of small topological inconsistencies and high frequency details from surface models. The method, called marching intersections (MI), adopts a volumetric approach and acts as a resampling filter. All the intersection points between the input model and the lines of a user selected 3D...
Article
Performing a really interactive and physically-based simulation of complex soft objects is still an open problem in computer animation/simulation. Given the application domain of virtual surgery training, a complete model should be quite realistic, interactive and should enable the user to modify the topology of the objects. Recent papers propose t...
Article
The paper goal is to fit trilinear iso-surfaces out of volume data, by adopting an adaptive mesh refinement approach and therefore supporting a higher accuracy with respect to standard MC solutions. In order to be correct, adaptive refinement must be applied to a topologically correct initial mesh patch. For this reason, we designed a new, Exhausti...
Article
. The paper focuses on the improvement of the quality of isosurfaces #tted on volume datasets with respect to standard MC solutions. The new solution presented improves the precision in the reconstruction process using an approach based on mesh re#nement and driven by the evaluation of the trilinear reconstruction #lter. The iso-surface reconstruct...
Article
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Since the introduction of techniques for isosurface extraction from volumetric datasets, one of the hardest problems has been to reduce the number of generated triangles (or polygons). This paper presents an algorithm that considerably reduces the number of triangles generated by a Marching Cubes algorithm, while presenting very close or shorter ru...
Conference Paper
Full-text available
Multi-resolution representations are widely used in many data visualization contexts and applications. The adoption of a multi-resolution approach provides the optimal management of a data representation, using at each instant of time a level of detail that is more adequate for the given action or task to be performed. Recently, multi-resolution ha...
Conference Paper
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The techniques for reducing the size of a volume dataset by preserving both the geometrical/topological shape and the information encoded in an attached scalar field are attracting growing interest. Given the framework of incremental 3D mesh simplification based on edge collapse, we propose an approach for the integrated evaluation of the error int...
Article
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The techniques for reducing the size of a volume dataset by preserving both the geometrical/topological shape and the information encoded in an attached scalar field are attracting growing interest. Given the framework of incre-mental 3D mesh simplification based on edge collapse, the paper proposes an approach for the integrated evaluation of the...
Article
Full-text available
Many sophisticated solutions have been proposed to reduce the geometric complexity of 3D meshes. A less studied problem is how to preserve on a simplified mesh the detail (e.g. color, high frequency shape detail, scalar fields, etc.) which is encoded in the original mesh. We present a general approach for preserving detail on simpli- fied meshes wh...
Article
Full-text available
. In this paper we propose a new approach for mapping and blending textures on 3D geometries. The system starts from a 3D mesh which represents a real object and improves this model with pictorial detail. Texture detail is acquired via a common photographic process directly from the real object. These images are then registered and stitched on the...
Article
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How to render very complex datasets, and yet maintain interactive response times, is a hot topic in volume rendering. In this paper we focus on projective visualization of datasets represented via tetrahedral tessellations. Direct projective visualization is performed by sorting tetrahedra with respect to view direction and then by projecting them...
Article
Since the introduction of standard techniques for isosurface extraction from volumetric datasets, one of the hardest problems has been to reduce the number of triangles (or polygons) generated. This paper presents an algorithm that considerably reduces the number of polygons generated by a Marching Cubes-like scheme without excessively increasing t...
Conference Paper
Full-text available
In this paper we propose a new approach for mapping and blending textures on 3D geometries. The system starts from a 3D mesh which represents a real object and improves this model with pictorial detail. Texture detail is ac- quired via a common photographic process directly from the real object. These images are then registered and stitched on the...
Article
Full-text available
A method is proposed which supports the extraction of isosurfaces from irregular volume data, represented by tetrahedral decomposition, in optimal time. The method is based on a data structure called interval tree, which encodes a set of intervals on the real line, and supports efficient retrieval of all intervals containing a given value. Each cel...
Article
This document is available in .ps format at our web site (http://miles.cnuce.cnr.it/cg/bibliography.html). This workwas partially founded by the Progetto Coordinato "Modelli multirisoluzione per la visualizzazione di campi scalari multidimensionali" of the Italian National Research Council (CNR). We wish to thank those who have made available on th...
Article
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Volume Visualization techniques have advanced considerably since the first international symposium held on this topic eight years ago. This paper briefly reviews the techniques proposed for the visualization of irregular (or scattered) volume datasets. In particular, methods which adopt simplicial decompositions of E 3 space are considered, and thi...
Article
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The paper proposes a computer-oriented interpretation of the laws ruling the elevation of #gures in bas- or high-relief sculptures, and presents some simple algorithms and a prototypal, public-domain software tool for the generation of 3D bas- and high-reliefs starting from 3D surface models. 1 Introduction Relief is the sculptural technique where...
Conference Paper
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Many sophisticated solutions have been proposed to reduce the geometric complexity of 3D meshes. A problem studied less often is how to preserve on a simplified mesh the detail (e.g., color, high frequency shape detail, scalar fields, etc.) which is encoded in the original mesh. We present a general approach for preserving detail on simplified mesh...
Article
Full-text available
Very large graphics models are common in a number of applications, and many different simplification methods have recently been developed. Some of them support the construction of multiresolution representations of the input meshes. On the basis of these innovative techniques, we foresee a modeling framework based on three separate stages (shape mo...
Article
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The paper deals with Delaunay Triangulations (DT) in Ed space. This classic computational geometry problem is studied from the point of view of the efficiency, extendibility to any dimensionality, and ease of implementation. A new solution to DT is proposed, based on an original interpretation of the well-known Divide and Conquer paradigm. One of t...
Article
In many applications the need for an accurate simplification of surface meshes is becoming more and more urgent. This need is not only due to rendering speed reasons, but also to allow fast transmission of 3D models in network-based applications. Many different approaches and algorithms for mesh simplification have been proposed in the last few yea...
Conference Paper
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The paper addresses the problem of the representation of three-dimensional works of art (e.g. sculptures, architectural elements, vases, etc.) in a web-based environment. Specifically, we propose a system for the visual presentation of the 3D results of a standard SQL query to distributed archives. The system solves the general problem of the remot...
Article
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A system to represent and visualize scalar volume data at multiple resolution is presented. The system is built on a multiresolution model based on tetrahedral meshes with scattered vertices that can be obtained from any initial dataset. The model is built off-line through data simplification techniques, and stored in a compact data structure that...