title: Stylized and abstract painterly rendering system using a multiscale segmented sphere hierarchy.
abstract: This paper presents a novel system framework for interactive, three-dimensional, stylized, abstract painterly rendering. In this framework, the input models are first represented using 3D point sets and then this point-based representation is used to build a multiresolution bounding sphere hierarchy. From the leaf to root nodes, spheres of various sizes are rendered into multiple-size strokes on the canvas. The proposed sphere hierarchy is developed using multiscale region segmentation. This segmentation task assembles spheres with similar attribute regularities into a meaningful region hierarchy. These attributes include colors, positions, and curvatures. This hierarchy is very useful in the following respects: 1) it ensures the screen-space stroke density, 2) controls different input model abstractions, 3) maintains region structures such as the edges/boundaries at different scales, and 4) renders models interactively. By choosing suitable abstractions, brush stroke, and lighting parameters, we can interactively generate various painterly styles. We also propose a novel scheme that reduces the popping effect in animation sequences. Many different stylized images can be generated using the proposed framework.
authors.affiliation: Computer Graphics Group/Visual System Laboratory, Department of Computer Science and Engineering, National Cheng-Kung University, Tainan, Taiwan. dodowell@csie.ncku.edu.tw
authors.forename: Ming-Te
authors.initials: MT
authors.lastname: Chi
authors.forename: Tong-Yee
authors.initials: TY
authors.lastname: Lee
mesh_terms: D000465:Algorithms; D003196:Computer Graphics; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D010151:Paintings; D010363:Pattern Recognition, Automated / Q000379:methods; D014584:User-Computer Interface