Sketch-based design for green geometry and image deformation |
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Authors: | Bin Sheng Weiliang Meng Hanqiu Sun Enhua Wu |
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Affiliation: | 1. Department of Computer Science and Engineering, Shanghai Jiao Tong University, Shanghai, China 2. Department of Computer Science and Engineering, The Chinese University of Hong Kong, Shatin, Hong Kong, China 3. Institute of Software, Chinese Academy of Sciences, LIAMA-NLPR, CAS Institute of Automation, Beijing, China 4. The Chinese University of Hong Kong, Shatin, Hong Kong, China 5. Institute of Software, Chinese Academy of Sciences, Beijing, China 6. University of Macau, Macau, China
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Abstract: | User interfaces have traditionally followed the WIMP (window, icon, menu, pointer) paradigm. Though functional and powerful, they are usually cumbersome for a novice user to design a complex model, requiring considerable expertise and effort. This paper presents a system for designing geometric models and image deformation with sketching curves, with the use of Green coordinates. In 3D modeling, the user first creates a 3D model by using a sketching interface, where a given 2D curve is interpreted as the projection of the 3D curve. The user can add, remove, and deform these control curves easily, as if working with a 2D line drawing. For a given set of curves, the system automatically identifies the topology and face embedding by applying graph rotation system. Green coordinates are then used to deform the generated models with detail-preserving property. Also, we have developed a sketch-based image-editing interface to deform image regions using Green coordinates. Hardware-assisted schemes are provided for both control shape deformation and the subsequent surface optimization, the experimental results demonstrate that 3D/2D deformations can be achieved in realtime. |
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