Integrated High-Quality Acquisition of Geometry and Appearance for Cultural Heritage
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1 Integrated High-Quality Acquisition of Geometry and Appearance for Cultural Heritage Christopher Schwartz, Michael Weinmann, Roland Ruiters, Reinhard Klein Institute of Computer Science II Computer Graphics 1 26/10/2011
2 Outline Motivation Previous Work Overview Acquisition Postprocessing Results Conclusion 2 26/10/2011
3 MOTIVATION 3 26/10/2011
4 Motivation Digitization of CH artefacts Public dissemination (see my talk tomorrow) Exchange between experts and institutions Novel tools for research 4 26/10/2011
5 Motivation The shapes of objects are scanned in HQ but what about appearance? Geometry only With texture Correct appearance 5 26/10/2011
6 Object Appearance Impression of reflection of incident light Influenced by features on different scales Macroscopic Mesoscopic Microscopic Viewpoint and Illumination dependent 6 26/10/2011
7 Form of Representation Macroscopic scale 3D shape Explicit representation (e.g. polygon mesh) Mesoscopic scale Individually resolved by human perception Statistical representation not accurate Explicit representation too costly Microscopic scale Alignment of microscopic structures Statistical representation (e.g. BRDF) Image based! 7 26/10/2011
8 Form of Representation Macroscopic scale 3D shape Explicit representation (e.g. polygon mesh) Mesoscopic scale Individually resolved by human perception Statistical representation not accurate Explicit representation too costly Microscopic scale Alignment of microscopic structures Statistical representation (e.g. BRDF) Image based! 8 26/10/2011
9 Form of Representation Macroscopic scale 3D shape Explicit representation (e.g. polygon mesh) Mesoscopic scale Individually resolved by human perception Statistical representation not accurate Explicit representation too costly Microscopic scale Alignment of microscopic structures Statistical representation (e.g. BRDF) Bidirectional Texture Function 9 26/10/2011
10 Why BTF? Data-driven No model assumption No statistical approximation High compression ratios Good rendering properties Full light transport simulation Realtime Streamable over the Internet see my talk tomorrow 10 26/10/2011
11 PREVIOUS WORK 11 26/10/2011
12 reference rendering reference rendering Previous Work Lensch et al. 2003: SVBRDF + external geometry + Good geometry - Analytical BRDF model assumption - Mesoscale only indicated with normal-mapping - Separate acquisition registration problem Müller et al. 2005: BTF + shape from silhouette + Meso- and Microscale effects captured with BTF + Integrated acquisition - Poor geometry Holroyd et al. 2010: SVBRDF + structured light + High-quality geometry + Integrated acquisition - Analytical BRDF model assumptions - Mesoscale only indicated with normal-mapping - Very sparse reflectance sampling 12 26/10/2011
13 OVERVIEW 13 26/10/2011
14 Goal: Digital Replica Digital Replica Arbitrary viewpoint Arbitrary illumination Arbitrary arrangement (virtual scene) High-quality geometry High-quality appearance (BTF) Acquisition integrated in one setup No error-prone registration No movement during acquisition Suitable for non-rigid objects Automatable 14 26/10/2011
15 The proposed pipeline Structured Light HDR Images Geometry Reconstruction Real Object Image Acquisition View/Light Dependent HDR Images Weinmann et al. 2011, 3DIMPVT Digitized Object BTF Resampling & Hole Filling Camera Calibration 3D Mesh 15 26/10/2011
16 ACQUISITION 16 26/10/2011
17 The Capture Setup Multi-Camera Dome 151 cameras: Canon PowerShot G9 12 Megapixels Integrated flash Rapid acquisition 8 projectors: Acer C20 Pico At different positions Completely computer controlled 17 26/10/2011
18 Appearance Measurement Acquire light/view combinations: 151 flashes 151 cams HDR: 3 exposures 68,403 images 2.5 hours 453 flash discharges a few seconds under 100W tungsten lamp 18 26/10/2011
19 Geometry Measurement Acquire structured light sequences: 8 projectors 38 patterns 151 cams HDR: 3 exposures 137,712 images 1.2 hours 19 26/10/2011
20 Calibration Geometric From structured light: Weinmann et al Radiometric Cameras: Known response curves Flashes: Capture reflectance standards for every discharge 20 26/10/2011
21 POSTPROCESSING 21 26/10/2011
22 Geometry Reconstruction Weinmann et al. 2011: HQ triangle meshes ABF++: Parameterization V U 22 26/10/2011
23 Appearance Reconstruction For every point: 23 26/10/2011
24 Appearance Reconstruction For every point: Measurement BTF Tabulated ( ) Camera hemispheres Tabulated ( ) In local orientation Local hemispheres 24 26/10/2011
25 Appearance Reconstruction Gather samples Not measured Irregular Occlusion 25 26/10/2011
26 Resampling & Hole Filling Representative points (random sampling) Irregular samples & confidence Interpolate both Radial Basis Functions 26 26/10/2011
27 Resampling & Hole Filling Perform clustering Build low-rank basis per cluster Non-negative Matrix Factorization 27 26/10/2011
28 Resampling & Hole Filling All points RBF interpolation Project into bases Data-driven regularization cluster-center Choose representation with minimum error Blend with interpolation w.r.t. confidence 28 26/10/2011
29 RESULTS 29 26/10/2011
30 Datasets Geometry: 250k 560k vertices (500k 1M Δ) Edge length 317 µm Appearance: BTF Spatial resolution (4.2 Megapixel) Texel 117 µm surface resolution Angular resolution Uncompressed: GB Compressed: 1.59 GB (780 MB,125MB) Resampling: 25 hours Compression: 8 hours 30 26/10/2011
31 Quality 31 26/10/2011
32 Faithfulness Photographic picture Our Result (tonemapped HDR) Polynomial Texture Map Malzbender et al (Single view and LDR!) 32 26/10/2011
33 Photorealistic Rendering 33 26/10/2011
34 Photorealistic Rendering 34 26/10/2011
35 Interactive Inspection 35 26/10/2011
36 CONCLUSION 36 26/10/2011
37 Conclusion High-quality Digital Replicas Free viewpoint Arbitrary illumination Photorealistic Realtime Integrated acquisition setup Geometry + appearance Rapid automated acquisition Processing pipeline Triangle Mesh + BTF Technical Contribution 37 26/10/2011
38 Questions Thank you for your attention! Datasets are available for download at ftp://btf.cs.uni-bonn.de Acknowledgement: The research leading to these results was partially funded by the European Community s Seventh Framework Programme (FP7/ ) under grant agreement n ; and by the German Science Foundation (DFG) under research grant KL 1142/ /10/2011
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