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Dr Yann Savoye
Innsbruck University
POEMS´15: Polytopal Element Methods inMathematics and Engineering
October 30, 2015 www.animlife.com
"Free at Last"
Cage-based Living Geometry
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October 30, 2015 #2
Content
1. Introduction2. Background and Related Work3. Cage-based Inversion4. Cage-based Reskinning5. Cage-based Registration6. Cage-based Stylization7. Conclusions
Dr Yann Savoye
1
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October 30, 2015 Dr Yann Savoye #3
Bringing Life to Creatures
• Capturing Life-Like Dynamic Geometry Into Deformable Cages.• A new Graphics-To-Vision Strategy built around the cage-based scheme.• Several Technical Tools in Shape Modeling, Animation, 4D Vision.
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October 30, 2015 Dr Yann Savoye #4
Bringing Life to Creatures
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October 30, 2015 Dr Yann Savoye #5
Technical Pillars
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October 30, 2015 Dr Yann Savoye #6
Inspired from Traditional Animation
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October 30, 2015 #7
Content
1. Introduction2. Background and Related Work3. Cage-based Inversion4. Cage-based Reskinning5. Cage-based Registration6. Cage-based Stylization7. Conclusions
Dr Yann Savoye
2
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October 30, 2015 #8
Cage-based Performance Capture.
Dr Yann Savoye
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October 30, 2015 Dr Yann Savoye #9
Cage-based Deformation
Mean Value CoordinatesJu et al ‘05
Green CoordinatesLipman et al ‘08
Variational HarmonicsBen Chen et al ‘09 Harmonic Coordinates
Joshi et al ‘07
Biharmonic CoordinatesJacobson et al ‘07
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October 30, 2015 Dr Yann Savoye #10
Mean Value Coordinates
Mean Value Coordinates for Closed Triangular Meshes
Ju et al ‘05
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October 30, 2015 Dr Yann Savoye #11
Green Coordinates
Green CoordinatesLipman et al ‘08
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October 30, 2015 Dr Yann Savoye #12
Harmonic Coordinates
Harmonic Coordinates for Character ArticulationJoshi et al ‘07
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October 30, 2015 #13
Presentation Overview
Dr Yann Savoye
Cage-basedModeling
Cage-based Reskinning
Cage-basedRegistration
Cage-basedStylization
Interactive Modeling(User-Specified)
Animation Reskinning(Temporally Data-Driven)
Space-Time Capture(Video-based, Unsupervized)
Surface Exaggeration( Space-Time Filtering )
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October 30, 2015 #14
Presentation Overview
Dr Yann Savoye
Cage-basedModeling
Cage-based Reskinning
Cage-basedRegistration
Cage-basedStylization
Graphics Vision
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October 30, 2015 #15
Presentation Overview
Dr Yann Savoye
Cage-basedModeling
Cage-based Reskinning
Cage-basedRegistration
Cage-basedStylization
Graphics-To-Vision Strategy: Relaxing the prior knowledge on the data
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October 30, 2015 #16
Content
1. Introduction2. Background and Related Work3. Cage-based Inversion4. Cage-based Reskinning5. Cage-based Registration6. Cage-based Stylization7. Conclusions
Dr Yann Savoye
3
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October 30, 2015 #17
Cage-based Modeling
Dr Yann Savoye
Cage-based Reskinning
Cage-basedRegistration
Cage-basedStylization
Objective: Introduction of a core inverse cage-based technique.
Cage-basedModeling
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October 30, 2015 Dr Yann Savoye #18
Interactive Shape Modeling
Laplacian Mesh EditingSorkine et al ‘05
Volumetric Graph LaplacianZhou et al ‘05
As Rigid As PossibleSorkine et al ‘07
Mesh IKSumner et al ‘05
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October 30, 2015 Dr Yann Savoye #19
Inverse Cage-based Modeling
Sparse Contraints
Default Pose Resulting Deformation
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October 30, 2015 Dr Yann Savoye #20
Inverse Cage-based Modeling
• Least-Square Cage (regularisation term)
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October 30, 2015 Dr Yann Savoye #21
Inverse Cage-based Modeling
• Differential Cage Coordinates
• Laplacian Cage Operator
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October 30, 2015 Dr Yann Savoye #22
Inverse Cage-based Modeling
• User-Specified Deforming Constraints
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October 30, 2015 Dr Yann Savoye #23
GPU Barycentric Map
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October 30, 2015 Dr Yann Savoye #24
Inverse Cage-based Modeling
• Cage-based Fitting
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October 30, 2015 Dr Yann Savoye #25
Inverse Cage-based Modeling
• Sparse Linear Least-Square Fitting
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October 30, 2015 #26
Content
1. Introduction2. Background and Related Work3. Cage-based Inversion4. Cage-based Reskinning5. Cage-based Registration6. Cage-based Stylization7. Conclusions
Dr Yann Savoye
4
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October 30, 2015 #27
Cage-based Reskinning
Dr Yann Savoye
Cage-basedRegistration
Cage-basedStylization
Cage-basedModeling
Objective: Introduction of a core space-time cage fitting technique.
Cage-based Reskinning
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October 30, 2015 Dr Yann Savoye #28
Surface Performance Capture
Surface CaptureStarck and Hilton ‘07 Skin Capture
Park and Hodgins ‘06
Performance CaptureDe Aguiar et al. “08
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October 30, 2015 Dr Yann Savoye #29
Highly Non-Rigid Surfaces
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October 30, 2015 Dr Yann Savoye #30
Generic and Shape-Aware Cages
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October 30, 2015 Dr Yann Savoye #31
Harmonic Coordinates
Harmonic Rigging
Cage-Model Setup Cage Voxelization Volumetric Heat diffusion
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October 30, 2015 Dr Yann Savoye #32
Cage-based Performance Animation
• Space-Time Cage Optimization
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October 30, 2015 Dr Yann Savoye #33
Silhouette Consistency
• Evaluation: Silhouette Consistency
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October 30, 2015 #34
Content
1. Introduction2. Background and Related Work3. Cage-based Inversion4. Cage-based Reskinning5. Cage-based Registration6. Cage-based Stylization7. Conclusions
Dr Yann Savoye
5
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October 30, 2015 #35
Cage-based Registration
Dr Yann Savoye
Cage-basedStylization
Cage-basedModeling
Cage-based Reskinning
Objective: Extending the system toward unaligned geometric targets.
Cage-basedRegistration
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October 30, 2015 Dr Yann Savoye #36
Geometric Reconstruction
Polyhedral Visual HullMatusik et al ‘01
Watertight ReconstructionHornung et al ‘07
Multi-view StereoLiu et al ‘10
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October 30, 2015 Dr Yann Savoye #37
Geometric Registration
Piecewise Rigid registrationPekelny et al ‘08
Non-Rigid RegistrationLi et al ‘08
Patch-based RegistrationBudd et al ‘10
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October 30, 2015 Dr Yann Savoye #38
• Camera Projection Operator
• Silhouette-based Visual Cone
• Voxel-based Visual Hull
Target Geometry from Silhouettes
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October 30, 2015 Dr Yann Savoye #39
Volumetric Shape Carving
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October 30, 2015 Dr Yann Savoye #40
Watertight Surface Polygonization
• Temporally Inconsistent Surface
• Laplacian Surface Smoothing
• Oriented Target Point Clouds
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October 30, 2015 Dr Yann Savoye #41
Target Geometry from Silhouettes
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October 30, 2015 Dr Yann Savoye #42
Normal-Guided Correspondences
• Normal-Guided Pruning.• Standard Shepard Interpolation for compatible candidates. • Locally Weighted Correspondences.
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October 30, 2015 Dr Yann Savoye #43
• Biharmonic Cage-based Coordinates
• Per-Handle Biharmonic Field
• Flexible Local Rigidity Field
Biharmonic Overlapping Fields
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October 30, 2015 Dr Yann Savoye #44
Elasto-Plastic Optimization
• Re-Weighted Iterative Subspace Solver
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October 30, 2015 Dr Yann Savoye #45
Cage-based Template Registration
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October 30, 2015 Dr Yann Savoye #46
Space-Time Output Surface
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October 30, 2015 #47
Content
1. Introduction2. Background and Related Works3. Cage-based Inversion4. Cage-based Reskinning5. Cage-based Registration6. Cage-based Stylization7. Conclusions
Dr Yann Savoye
6
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October 30, 2015 #48
Cage-based Stylization
Dr Yann Savoye
Cage-basedModeling
Cage-based Reskinning
Objective: Exaggerating surface motion by cage-based filtering.
Cage-basedRegistration
Cage-basedStylization
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October 30, 2015 Dr Yann Savoye #49
Cage-based Shape Exaggeration
• Input Animation Mesh Sequence
• Cage-based Conversion
• Temporal Cage Parameters
• Cage-based Filtering
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October 30, 2015 Dr Yann Savoye #50
Cage-based Shape Exaggeration
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October 30, 2015 #51
Content
1. Introduction2. Background and Related Work3. Cage-based Inversion4. Cage-based Reskinning5. Cage-based Registration6. Cage-based Stylization7. Conclusions
Dr Yann Savoye
7
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October 30, 2015 Dr Yann Savoye #52
• Capturing Life-Like Dynamic Geometry Into Cages.• A new Graphics-To-Vision Strategy built around the cage-based scheme.• Several Technical Tools in Shape Modeling, Animation, 4D Vision.
Conclusions
• Cage-based Registration / Filtering / Reskinning.• Cage-based Fitting And Non-Rigid ICP Scheme. • Unsupervized Correspondences and Watertight Point Cloud. • Silhouette-Awareness and Shape-Awareness.• Scalability / Interactivity / Linearity / Efficiency / Simplicity.
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October 30, 2015 Dr Yann Savoye #53
Caged or not caged?
Even if shapes are enclosed inside cages, highly non-rigid deformation is allowed by a few degree of freedom – shapes are free at last!
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October 30, 2015 #54
To add fuel to the fire…
Cage-based Performance CaptureStudies in Computational Intelligence – vol 509
Springer Book
Dr Yann Savoye