As-rigid-as-possible image registration for hand-drawn cartoon animations
Proceedings of the 7th International Symposium on Non-Photorealistic Animation and Rendering
A nonparametric regression model for virtual humans generation
Multimedia Tools and Applications
Energy-based image deformation
SGP '09 Proceedings of the Symposium on Geometry Processing
Temporal noise control for sketchy animation
Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Non-Photorealistic Animation and Rendering
Sketch-based skeleton-driven 2D animation and motion capture
Transactions on edutainment VI
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In this paper, we propose a fast and stable method for 2D shape deformation based on rigid square matching. Our method utilizes uniform quadrangular control meshes for 2D shapes and tries to maintain the rigidity of each square in the control mesh during user manipulation. A rigid shape matching method is performed to find an optimal pure rotational transformation for each square in the control mesh. An iterative solver is proposed to compute the final deformation result for the entire control mesh by minimizing the difference between the deformed vertices and their counterparts in the neighboring rigid square. The deformation result on the 2D shape is as rigid as possible and the details of the shape are preserved well. As extensions, we present a shape-aware splitting method to improve the deformation effect for coarse meshes and a simple sketch-based clustering method for skeletal deformation. Experiments with various 2D shapes show that our method is efficient and easy to use, and can provide physically plausible result for shapes of objects in real world. Therefore, our shape deformation method is especially suitable for applications in cartoon character animation. Copyright © 2008 John Wiley & Sons, Ltd.