point-based techniques mei ’ e fang wednesday, november 1, 2006
TRANSCRIPT
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Point-based techniques
Mei’e FangWednesday, November 1, 2006
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contents
relative conceptions of point-based surfaces
point-based representations point-based geometry processing point-based rendering a paper on computing areas of point-
based surfaces
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main references
Leif Kobbelt, Mario Botsch. A survey of point-based techniques in computer graphics. Computers & Graphics, 2004 28: 801-814.
Yu-Shen Liu, Jun-Hai Yong, Hui Zhang, Dong-Ming Yan, Jia-Guang Sun. A quasi-Monte Carlo method for computing areas of point-sampled surfaces. CAD, 2006 38: 55-68.
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Relative conceptions
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NURBS → Meshes → Point-clouds
The topological consistency becomes more and more simply.
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neighborhoods and normals
two kinds of neighborhoods Euclidean neighborhoods not suited for irregularly sampled
surfaces and unreliable in some cases k-nearest neighborhoods a naturally adaptive neighborhood
relation
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Amenta, N., Bern, M., Kamvysselis, M., 1998. A new Voronoi-based surface reconstruction algorithm. In: Proc. of ACM SIGGRAPH 98.
Andersson, M., Giesen, J., Pauly, M., Speckmann, B., 2004. Bounds on the k-neighborhood for locally uniformly sampled surfaces. In: Proc. of Symp. on Point-Based Graphics 04. pp. 167–171.
J. Sankaranarayanan, H. Samet, and A. Varshney, A Fast k-Neighborhood Algorithm for Large Point Clouds. Proceedings of the Symposium on Point-Based Graphics July 29 - 30, 2006, Boston, MA
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the estimation of normals the covariance matrix:
The eigenvector corresponding to the smallest eigenvalue gives an estimate for the normal direction.
Hoppe, H., DeRose, T., Duchamp, T., McDonald, J., Stuetzle, W., 1992. Surface reconstruction from unorganized points. In: Proc. of ACM SIGGRAPH92. pp. 71–78.
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Point-based representations purely point-based
representations surface splats moving least-squares surfaces
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point clouds
purely point-based representations
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Grossman, J. P., Dally, W. J., 1998. Point sample rendering. In: Proc. Of Eurographics Workshop on Rendering 98. pp. 181–192.
Similar to image-based approaches, this representation is also constructed from several views of an input object, but it differs in that each pixel is a surface sample containing geometric position and (view-independent) surface color.
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Kalaiah, A., Varshney, A., 2003. Statistical point geometry. In: Proc. of Eurographics Symposium on Geometry Processing 03. pp. 107–115.
using a hierarchical PCA analysis to partition the geometry and its attributes (normals and colors) into a set of local Gaussian probability distributions
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Botsch, M., Wiratanaya, A., Kobbelt, L., 2002. Efficient high quality rendering of point sampled geometry. In: Proc. of Eurographics Workshop on Rendering 02.
considering the quantization precision to minimize redundancy and using a hierarchical PBR to reduce the memory cost
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PBR of a circle with different quantization levels
(left: 5 bit, right 10 bit)
and different sampling densities
(top:2/32, bottom: 2/1024).
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Zwicker, M., Pfister, H., van Baar, J., Gross, M., 2001. Surface splatting. In:Proc. of ACM SIGGRAPH 01. pp. 371–378.
circular disks→elliptical splats
surface splats
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two tangential axes: the principal curvature directions of the underlying surfacetwo respective radii: inversely proportional to the corresponding minimum and maximum curvatures
superiorities:the same topological flexibility as pure point clouds;the same approximation order as triangle meshes;locally the best linear approximant to a smooth surface;
elliptical splats
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Pauly, M., Keiser, R., Kobbelt, L., Gross, M., 2003. Shape modeling with point-sampled geometry. In: Proc. of ACG SIGGRAPH 03.
representing sharp features
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moving least-squares surfaces
g is found by minimizing
H is found by minimizing
The weight function
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• Alexa, M., Behr, J., Cohen-Or, D., Fleishman, S., Levin, D., Silva, C. T., 2003. Computing and rendering point set surfaces. IEEE Transactions on Visualization and Computer Graphics 9 (1), 3–15.
• Alexa, M., Adamson, A., 2004. On normals and projection operators for surfaces defined by point sets.In: Proc. of Symp. on Point-Graphics 04.pp. 149–155.
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Amenta, N., Kil, Y., 2004. Defining point-set surfaces. In: Proc. of ACM SIGGRAPH 04.
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Point-based geometry processing
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noise removalPauly, M., Gross, M., 2001. Spectral processing of point-sampled geometry.
In: Proc. of ACM SIGGRAPH 01.
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Original Patch Gaussian Wiener noise+blur Layout Filter Filter
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summary versatile spectral decomposition of
point-based models
effective filtering
adaptive resampling
efficient processing of large point-sampled models
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Pauly, M., Keiser, R., Gross, M., 2003. Multi-scale feature extraction onpoint-sampled surfaces. In: Proc. of Eurographics 03.
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Weyrich, T., Pauly, M., Heinzle, S., Keiser, R., Scandella, S., Gross, M., 2004.Post-processing of scanned 3D surface data. In: Proc. of Symp. on Point-Based Graphics 04. pp. 85–94.
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decimation
three kinds of decimation methods Pauly, M., Gross, M., Kobbelt, L., 2002. Efficient simplification of point-sampled surfaces. In: Proc. of IEEE Visualization 02.
hierarchical clustering method iterative simplification particle simulation
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clustering method
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iterative simplification
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particle simulation
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comparison
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Wu, J., Kobbelt, L., 2004. Optimized subsampling of point sets for surfacesplatting. In: Proc. of Eurographics 04.
a simplification method especially designed for splat-based surface
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editing
Zwicker, M., Pauly, M., Knoll, O., Gross, M., 2002. PointShop 3D: An interactive system for point-based surface editing. In: Proc. of ACM SIGGRAPH02.
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Adams, B., Wicke, M., Dutr´e, P., Gross, M., Pauly, M., Teschner, M., 2004.Interactive 3D painting on point-sampled objects. In: Proc. of Symp. onPoint-Based Graphics 04. pp. 57–66.
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deformationPauly, M., Keiser, R., Kobbelt, L., Gross, M., 2003. Shape modeling with point-sampled geometry. In: Proc. of ACG SIGGRAPH 03.
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PDE-based segmentation, texture synthesis, texture inpainting and geometry smoothing
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Constructive Solid Geometry technique
references• Clarenz, U., Rumpf, M., Telea, A., 2004. Finite elements on point based surfaces.In: Proc. of Symp. on Point-Based Graphics 04. pp. 201–211.
• Adams, B., Dutre, P., 2003. Interactive boolean operations on surfel-bounded solids. In: Proc. of ACM SIGGRAPH 03. pp. 651–656.
• Adams, B., Dutre, P., 2004. Boolean operations on surfel-bounded solids using programmable graphics hardware. In: Proc. of Symp. on Point-Based Graphics 04. pp. 19–24.
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Point-based rendering
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Botsch, M., Spernat, M., Kobbelt, L., 2004.Phong splatting. In: Proc. of Symp. on Point-Based Graphics 04.
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References Grossman, J. P., Dally, W. J., 1998. Point sample rendering.
In: Proc. Of Eurographics Workshop on Rendering 98. pp. 181–192.
Dachsbacher, C., Vogelgsang, C., Stamminger, M., 2003. Sequential point trees. In: Proc. of ACM SIGGRAPH 03.
Botsch, M., Kobbelt, L., 2003. High-quality point-based rendering on modern GPUs. In: Proc. of Pacific Graphics 03.
Guennebaud, G., Paulin, M., 2003. Efficient screen space approach for hardware accelerated surfel rendering. In: Proc. of Vision, Modeling, and Visualization 03.
Botsch, M., Spernat, M., Kobbelt, L., 2004. Phong splatting. In: Proc. Of Symp. on Point-Based Graphics 04.
Zwicker, M., Räsänen, J., Botsch, M., Dachsbacher, C., Pauly, M., 2004. Perspective accurate splatting. In: Proc. of Graphics Interface 04.
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Computing the areas of point-based surfaces
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Quasi-Monte Carlo method
Yu-Shen Liu, Jun-Hai Yong, Hui Zhang, Dong-Ming Yan, and Jia-Guang Sun. A quasi-Monte Carlo method for computing areas of point-sampled surfaces. Computer-Aided Design 2006; 38(1): 55-68.
Li X, Wang W, Martin RR, Bowyer A. Using low-discrepancy sequences and the Crofton formula to compute surface areas of geometric models. Comput Aided Design 2003;35(9):771–82.
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the Cauchy–Crofton formula
the area formula of B
integration approximation
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steps
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the smallest enclosing ball of point sets
Gärtner B. Fast and robust smallest enclosing balls. In: Proc. 7th Annual European Symposium on Algorithms (ESA). Volume 1643 of Lecture Notes in Computer Science, Springer-Verlag (1999), p. 325-338, 1999.
http://www.inf.ethz.ch/personal/gaertner/miniball.html
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generating uniformly distributed lines
http://mathworld.wolfram.com/SpherePointPicking.html
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the LPSI algorithm
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collecting and clustering inclusion points
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classifying clusters
(a) Q contains no intersection point. (b) Q contains only one touching point.
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(c) Q contains only one intersection point. (d) Q contains two intersection points.
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approximation errors
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Ohtake Y., Belyaev A., Alexa M., Turk G., Seidel H.P. Multi-level
partition of unity implicits. In: Proceedings of SIGGRAPH’03; 2003.
p. 463-470.
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http://graphics.stanford.edu/data/3Dscanrep/
Desbrun M., Meyer M., SchrÖder P., Barr A.H. Implicit fairing of irregular meshes using diffusion and curvature flow. In: Proceedings of SIGGRAPH’99; 1999. p. 317-324.
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applications
several point-based processing applications such as property computation, area-preserving smoothing, shape recognition, matching…