Journal of Computer Science and Technology ›› 2019, Vol. 34 ›› Issue (5): 1109-1122.doi: 10.1007/s11390-019-1963-3

Special Issue: Computer Graphics and Multimedia

• Computer Graphics and Multimedia • Previous Articles     Next Articles

CR-Morph: Controllable Rigid Morphing for 2D Animation

Wen-Wu Yang1, Member, CCF, Jing Hua1,2, Kun-Yang Yao1   

  1. 1 School of Computer and Information Engineering, Zhejiang Gongshang University, Hangzhou 310012, China;
    2 Department of Computer Science, Wayne State University, Michigan 48202, U.S.A
  • Received:2018-12-03 Revised:2019-07-24 Online:2019-08-31 Published:2019-08-31
  • About author:Wen-Wu Yang is currently an associate professor at the School of Computer and Information Engineering, Zhejiang Gongshang University, Hangzhou. Dr. Yang received his Ph.D. degree in computer science from the State Key Laboratory of CAD&CG, Zhejiang University, Hangzhou, in 2009. His research interests include cartoon animation, motion capture and motion synthesis.
  • Supported by:
    This work was supported by the National Natural Science Foundation of China under Grant Nos. 61003189, U1609215 and 61472363, and the US National Science Foundation under Grant Nos. 0915933, 0937586, and 1647200.

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This paper presents a rigidity-preserving morphing technique that blends a pair of 2D shapes in a controllable manner. The morphing is controllable in two aspects:1) motion dynamics in the interpolation sequences can be effectively enhanced through an intuitive skeleton control and 2) not only the boundaries but also the interior features of the source and target shapes are precisely aligned during the morphing. We introduce a new compatible triangulation algorithm to decompose the source and target shapes into isomorphic triangles. Moreover, a robust and motion-controllable rigiditypreserving transformation scheme is proposed to blend the compatible triangulations, ultimately leading to a morphing sequence which is appearance-preserving and with the desired motion dynamics. Our approach constitutes a powerful and easy-to-use morphing tool for two-dimensional animation. We demonstrate its versatility, effectiveness and visual accuracy through a variety of examples and comparisons to prior work.

Key words: compatible triangulation; disc-based interpolation; rigid morphing; skeleton-based dynamics;

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