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09/11/2006 Bharathi Manivannan A.S Motion Warping International Conference on Computer Graphics and Interactive Techniques, SIGGRAPH’95 - -Andrew Witkin.

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Presentation on theme: "09/11/2006 Bharathi Manivannan A.S Motion Warping International Conference on Computer Graphics and Interactive Techniques, SIGGRAPH’95 - -Andrew Witkin."— Presentation transcript:

1 09/11/2006 Bharathi Manivannan A.S Motion Warping International Conference on Computer Graphics and Interactive Techniques, SIGGRAPH’95 - -Andrew Witkin and Zoran Popovi´c

2 09/11/2006 Bharathi Manivannan A.S Motion Set of motion curves each giving model’s parameters as a function of time Set of motion curves each giving model’s parameters as a function of time t Ө

3 09/11/2006 Bharathi Manivannan A.S Warping Continuous family of transformations of a graphical object Continuous family of transformations of a graphical object –Transforming Shape –Transforming Attribute

4 09/11/2006 Bharathi Manivannan A.S Motion Warping A technique for editing captured or key framed animation based on warping of the motion parameter curves Complex motions (Human walk, playing tennis) are radically reshaped with few keyframes

5 09/11/2006 Bharathi Manivannan A.S Why Motion Editing?? Fix Imperfect motions Fix Imperfect motions Reuse motions from Library in multiple settings Reuse motions from Library in multiple settings Dynamically generate motions for interactive environment Dynamically generate motions for interactive environment

6 09/11/2006 Bharathi Manivannan A.S Background SOFTIMAGE TM, ALIAS TM, WAVEFRONT TM SOFTIMAGE TM, ALIAS TM, WAVEFRONT TM –Curve Fitting, Global Scaling and Translation (Not suitable for Large scale Transformations) Data mapping to Image Morphing points (Litwinovicz and Williams [SIGGRAPH ’94]) Function Fitting [H. Ko and N. I. Badler] Motion Curve Filtering (M. Unuma and R. Takeuchi) Multi-resolution Curve Fitting (A. Finkelstein and D. H. Salesin [SIGGRAPH ’94] ) Blending Techniques (K. Perlin [IEEE Transactions on Visualization and Computer Graphics ])

7 09/11/2006 Bharathi Manivannan A.S Signal Deformation Time warping Time warping Scale and offset Scale and offset Ө t Ө ’ (t) Ө(t)

8 09/11/2006 Bharathi Manivannan A.S Concatenation Blending Blending t Ө Ө1Ө1 Ө2Ө2 Ө blend Ө1Ө1 Ө2Ө2

9 09/11/2006 Bharathi Manivannan A.S Time for Videos

10 09/11/2006 Bharathi Manivannan A.S Conclusion Few motion warping key frames to modify prototype motions Few motion warping key frames to modify prototype motions Simple Blending to join overlapping motion clips Simple Blending to join overlapping motion clips Fits well into Familiar keyframe animation paradigm Fits well into Familiar keyframe animation paradigm Limitations Limitations –Difficulty in enforcing geometric constraints between keys –Extreme Warps are prone to look distorted and unnatural


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