A Framework for Virtual Restoration of Ancient Documents by Combination of Multispectral and 3D Imaging (English)

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Historical documents often undergo various changes over time, that alter their original state and reduce their legibility. Digital techniques are widely applied for document preservation, archiving, analysis and dissemination over the Internet. The goal of restoration is to improve the document legibility for both human and automatic operators, to extract patterns and enhance colour reproduction. Our paper presents a framework for virtual restoration of ancient documents based on a combination of multispectral acquisition, 3D imaging and digital image analysis. The proposed framework consists of several steps. First, digital representations of the documents are acquired as multispectral images and 3D surface maps, the latter reconstructed by a structured light technique. A multispectral camera and a digital projector are used in triangular configuration for 2D and 3D data acquisition. Then the multispectral images are registered against possible misalignments, and the 3D surface representation is used to correct geometrical distortions. Document flattening is then performed by 3D surface parameterization and texture mapping. Statistical techniques of decorrelation are applied to extract individual context parts of the document patterns (stamp, text, etc.) and to attenuate interferences. The processed data are then binarized by the proper segmentation technique. The entire digital object history - all the acquisition and processing steps, with the corresponding parameters - is stored in metadata files. These data can be exploited in a future evaluation of the restoration process and can be used for either the creation of an expert knowledge database or the extraction of cross-document observations and conclusions.

Table of contents conference proceedings

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1
A Framework for Virtual Restoration of Ancient Documents by Combination of Multispectral and 3D Imaging
Bianco, Gianfranco / Bruno, Fabio / Tonazzini, A. / Salerno, E. / Savino, P. / Zitova, B. / Sroubek, F. / Console, E. | 2010
9
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Pintore, Giovanni / Combet, Roberto / Gobbetti, Enrico / Marton, Fabio / Turner, Russell | 2010
17
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Giachetti, Andrea / Guitián, J. A. Iglesias / Gobbetti, Enrico | 2010
25
Manual Segmentation and Semantic-based Hierarchical Tagging of 3D models
Papaleo, Laura / Floriani, Leila De | 2010
33
Mixed Reality and Gesture Based Interaction for Medical Imaging Applications
Abate, Andrea F. / Nappi, Michele / Ricciardi, Stefano / Tortora, Genoveffa | 2010
41
Towards a Voting Scheme for Calculating Light Source Positions from a given Target Illumination
Zmugg, René / Havemann, Sven / Fellner, Dieter W. | 2010
49
Two Examples of GPGPU Acceleration of Memory-intensive Algorithms
Marras, Stefano / Mura, Claudio / Gobbetti, Enrico / Scateni, Riccardo / Scopigno, Roberto | 2010
57
An Adaptive Video Surveillance Architecture for Behavior Analysis
Zini, Luca / Noceti, Nicoletta / Odone, Francesca | 2010
65
3D Body Model Construction and Matching for Real Time People Re-Identification
Baltieri, Davide / Vezzani, Roberto / Cucchiara, Rita | 2010
73
Facile: a System for Artificial Face Dataset Generation
Brambilla, Andrea / Colombo, Alessandro | 2010
81
Mutual Correspondences: An Hybrid Method for Image-to-geometry Registration
Sottile, Michele / Dellepiane, Matteo / Cignoni, Paolo / Scopigno, Roberto | 2010
89
Improving 2D-3D Registration by Mutual Information using Gradient Maps
Palma, Gianpaolo / Corsini, Massimiliano / Dellepiane, Matteo / Scopigno, Roberto | 2010
95
Adaptive Quad Mesh Simplification
Bozzo, Agostino / Panozzo, Daniele / Puppo, Enrico / Pietroni, Nico / Rocca, Luigi | 2010
103
Building Morphological Representations for 2D and 3D Scalar Fields
Comic, Lidija / Floriani, Leila De / Iuricich, Federico | 2010
111
A Dimension-Independent and Extensible Framework for Huge Geometric Models
Canino, David | 2010
117
Toward Wide-Area Camera Localization for Mixed Reality
Garro, Valeria / Fusiello, Andrea | 2010
123
Composition of Texture Atlases for 3D Mesh Multi-texturing
Pagés, Rafael / Arnaldo, Sergio / Morán, Francisco / Berjón, Daniel | 2010
129
Developing a Web 3.0 E-learning Portal with X3D Technologies
Cerbo, Francesco Di / Dodero, Gabriella / Papaleo, Laura | 2010
135
Modeling Liquidus Hypersurfaces through Simplicial Complexes
Natali, Mattia / Attene, Marco / Ottonello, Giulio | 2010
141
Natural Interaction and Computer Graphics Applications
Iacolina, Samuel A. / Lai, Alessandro / Soro, Alessandro / Scateni, Riccardo | 2010
147
Tools and Applications for Teaching and Research in Computer Graphics
Guggeri, Fabio / Livesu, Marco / Scateni, Riccardo | 2010
153
Monitor-Based tracking system for Wide Augmented Reality Environments
Re, Guido Maria / Caruso, Giandomenico / Belluco, Paolo / Bordegoni, Monica | 2010