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Analysis of Ancient Mosaic Images for Dedicated ... - Institut Fresnel

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xii<br />

2.4.2 The CENOBIUM Project: an Integrated Visual Comparison <strong>of</strong> Historiated Capitals 50<br />

2.4.3 Classifying and Archiving Carved Faces: the Bayon Digital Archival Project . . . . 51<br />

2.5 Physical Reproduction from the Digital Model . . . . . . . . . . . . . . . . . . . . . . . 52<br />

2.6 Virtual Reconstruction and Re-assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 53<br />

2.6.1 Virtual Reconstruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53<br />

2.6.2 Virtual Re-assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55<br />

2.6.3 Virtual Repainting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57<br />

2.7 Supporting the Restoration Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58<br />

2.7.1 Tools <strong>for</strong> Investigation and Diagnostics . . . . . . . . . . . . . . . . . . . . . . . 59<br />

2.7.2 Tools Supporting Knowledge Management . . . . . . . . . . . . . . . . . . . . . 62<br />

2.8 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65<br />

Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67<br />

3 Accurate and Detailed Image-Based 3D Documentation <strong>of</strong> Large Sites and Complex Objects 73<br />

Fabio Remondino<br />

3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73<br />

3.2 Reality-based 3D Modeling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74<br />

3.2.1 Techniques and Methodologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75<br />

3.2.2 Multi-sensor and Multi-source Data Integration . . . . . . . . . . . . . . . . . . . 76<br />

3.2.3 Standards in Digital 3D Documentation . . . . . . . . . . . . . . . . . . . . . . . 78<br />

3.3 Photogrammetry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79<br />

3.3.1 Image Data Acquisition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80<br />

3.3.2 Camera Calibration and Image Orientation . . . . . . . . . . . . . . . . . . . . . 82<br />

3.3.3 3D Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87<br />

3.3.4 Structuring and Modeling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89<br />

3.3.5 Texturing and Visualization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90<br />

3.3.6 Main Applications and Actual Problems . . . . . . . . . . . . . . . . . . . . . . . 93<br />

3.4 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95<br />

Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96<br />

4 Processing Sampled 3D Data: Reconstruction and Visualization Technologies 105<br />

Marco Callieri, Matteo Dellepiane, Paolo Cignoni, Roberto Scopigno<br />

4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106<br />

4.1.1 Sources <strong>of</strong> Sampled 3D Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106<br />

4.2 Basic Geometric Processing <strong>of</strong> Scanned Data . . . . . . . . . . . . . . . . . . . . . . . . 108<br />

4.2.1 The 3D Scanning Pipeline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109<br />

4.2.2 Implementing Range Maps Alignment as an Automatic Process . . . . . . . . . . 113<br />

4.2.3 Enhancing Incomplete Surface Sampling . . . . . . . . . . . . . . . . . . . . . . 115<br />

4.3 Color Sampling and Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116<br />

4.3.1 Basic Acquisition <strong>of</strong> Color Data . . . . . . . . . . . . . . . . . . . . . . . . . . . 116<br />

4.3.2 Recovering Camera Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117<br />

4.3.3 Mapping Complex Photographic Detail on 3D Models . . . . . . . . . . . . . . . 119<br />

4.3.4 Advanced Color Data Acquisition: Sampling Surface Reflection Properties . . . . 120<br />

4.4 MeshLab: an Open Source Tool <strong>for</strong> Processing 3D Scanned Data . . . . . . . . . . . . . . 121<br />

4.5 Efficient Visualization and Management <strong>of</strong> Sampled 3D Data . . . . . . . . . . . . . . . 123<br />

4.5.1 Simplification and Multiresolution Management <strong>of</strong> Huge Models . . . . . . . . . 124

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