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Digital Papercutting


Source: www.cs.cmu.edu
Topic: Papercutting

Sort Desciption: Digital Papercutting Yanxi LiuandJames Hays Carnegie Mellon University Ying-Qing Xuand Heung-Yeung Shum Microsoft Research Asia Figure1: Given a papercut-pattern (a), our algorithm performs analysis ...

Content Inside: Digital Papercutting Yanxi LiuandJames Hays Carnegie Mellon University Ying-Qing Xuand Heung-Yeung Shum Microsoft Research Asia Figure1: Given a papercut-pattern (a), our algorithm performs analysis, fold-then-cut plan generation and synthesis. The algorithm identifies the dihedral symmetry group D 2 x 4 in the outer-ring of the pattern (b), the inner bilateral symmetry (c) as well as the asymmetry region (the tail of the dragonfly). The fold-then-cut plan is generated by symmetry group indexing of each sub-region of thepapercut pattern (d). Finally, newpapercut patterns with the same motif as the input but different symmetry groups ( D 2 x 3 , D 2 x 7 respectively ineandf) are synthesized. SYNOPSIS We develop asymmetry-based computer analysis and synthesis platform that, given a digitized image of areal-world papercut-pattern, is able to (1) identify dihedral and frieze sym- metryaswellas asymmetric sub-patterns of the input; (2) generate a fold-then-cut plan that can be used to recreate the input papercut- pattern; and (3) synthesize newpapercut patterns by varying the motif automatically extracted from the input, or by varying the sym- metrygroup describing the structural organization of the input pa- percutpattern. We formalize a papercut-pattern as a composition of multiple sub-patterns that are either reflection symmetric (with dihedral or frieze symmetry groups) or reflection asymmetric. INTRODUCTION Symmetry or deviation from symmetry is the central theme of many different art forms, ranging from music, painting, sculpture to various decorative and folk arts. One of the most popular and accessible such art forms is that ofpapercutting, where symmetry is used both in its artistic design and its gener- ationprocess. Intrigued by this effective, seamless combination, we are interested in using computational means to reveal the rela- tionshipbetween the form and generative process fora digitized papercut-patt ...



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