Free-form deformation of solid geometric models
SIGGRAPH '86 Proceedings of the 13th annual conference on Computer graphics and interactive techniques
Piecewise cubic mapping functions for image registration
Pattern Recognition
The Computation of Visible-Surface Representations
IEEE Transactions on Pattern Analysis and Machine Intelligence
Curves and surfaces for computer aided geometric design
Curves and surfaces for computer aided geometric design
Inkwell: A 2-D animation system
Proceedings of the 18th annual conference on Computer graphics and interactive techniques
Feature-based image metamorphosis
SIGGRAPH '92 Proceedings of the 19th annual conference on Computer graphics and interactive techniques
Interactive skeleton techniques for enhancing motion dynamics in key frame animation
Communications of the ACM
A two-dimensional interpolation function for irregularly-spaced data
ACM '68 Proceedings of the 1968 23rd ACM national conference
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NPAR '00 Proceedings of the 1st international symposium on Non-photorealistic animation and rendering
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IEEE Transactions on Visualization and Computer Graphics
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IEEE Computer Graphics and Applications
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IEEE Computer Graphics and Applications
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CA '96 Proceedings of the Computer Animation
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TPCG '03 Proceedings of the Theory and Practice of Computer Graphics 2003
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ISCGAV'04 Proceedings of the 4th WSEAS International Conference on Signal Processing, Computational Geometry & Artificial Vision
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CGI'06 Proceedings of the 24th international conference on Advances in Computer Graphics
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The work described here extends the power of 2D animation with a form of texture mapping conveniently controlled by line drawings. By tracing points, line segments, spline curves, or filled regions on an image, the animator defines features which can be used to animate the image. Animations of the control features deform the image smoothly. This development is in the tradition of “skeleton”-based animation, and “feature”-based image metamorphosis. By employing numerics developed in the computer vision community for rapid visual surface estimation, several important advantages are realized. Skeletons are generalized to include curved “bones,” the interpolating surface is better behaved, the expense of computing the animation is decoupled from the number of features in the drawing, and arbitrary holes or cuts in the interpolated surface can be accommodated. The same general scattered data interpolation technique is applied to the problem of mapping animation from one image and set of features to another, generalizing the prescriptive power of animated sequences and encouraging reuse of animated motion.