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3/7/2008 Department of Computer Science Slide 1
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Single Viewpoint Symmetry- Based Model Completion for Efficient 3D - - PowerPoint PPT Presentation
Single Viewpoint Symmetry- Based Model Completion for Efficient 3D - - PowerPoint PPT Presentation
Single Viewpoint Symmetry- Based Model Completion for Efficient 3D Acquisition Alvin Law Daniel Aliaga Purdue University 3/7/2008 Department of Computer Science Slide 1 Motivation Goal: Capture a complete model from a single
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Observation
Discovering and using the symmetry can help capture
complete object models
Fill-in interior holes Extend the object “border” Complete the backside
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Model Completion
Steps
Input: initial capture from single viewpoint Discovery symmetry of object Use symmetry to add geometry to unseen regions of model Zip/watertight added regions of model
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Symmetry
Three cases supported
Bilateral Radial Surface-of-Revolution
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Bilateral Symmetry Detection
Compute symmetry plane
(sx, sy, theta, phi)
Minimize: total symmetric
distance between (p, q) pairs
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Radial Symmetry Detection
Compute axis of rotation
(s, t, u, v)
Minimize: total distance
between original point and replicated point on proposed model
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SOR Symmetry Detection
Compute axis of
rotation and disc radii
Minimize: radial
distance error between disc and points on disc
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Adding Geometry
Bilateral
Interior patches Extending borders
Radial
Repeat face n times
Surface of Revolution
Create synthetic object
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Zipping
Merge together
patches and model
Classify all patch
triangles
Inside Outside Split
Add zipping triangles
Minimize gap distance
patch model zip
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Watertight
Two means
Seal ends of model Create an inset
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