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		<citationkey>NascimentoQuRoReMePe:2011:CoIl2D</citationkey>
		<author>Nascimento, Renata,</author>
		<author>Queiroz, Fabiane,</author>
		<author>Rocha, Allan,</author>
		<author>Ren, Tsang Ing,</author>
		<author>Mello, Vinicius,</author>
		<author>Peixoto, Adelailson,</author>
		<affiliation>Department of Mathematics, PUC–Rio, Rio de Janeiro, Brazil</affiliation>
		<affiliation>Department of Computer Science, UFPE, Pernambuco, Brazil</affiliation>
		<affiliation>Department of Computer Science, PUC–Rio, Rio de Janeiro, Brazil</affiliation>
		<affiliation>Department of Computer Science, UFPE, Pernambuco, Brazil</affiliation>
		<affiliation>Institute of Mathematics, UFBA, Salvador, Brazil</affiliation>
		<affiliation>Institute of Mathematics, UFAL, Maceió, Brazil</affiliation>
		<title>Colorization and Illumination of 2D Animations  Based on a Region-tree Representation</title>
		<conferencename>Conference on Graphics, Patterns and Images, 24 (SIBGRAPI)</conferencename>
		<year>2011</year>
		<editor>Lewiner, Thomas,</editor>
		<editor>Torres, Ricardo,</editor>
		<booktitle>Proceedings</booktitle>
		<date>Aug. 28 - 31, 2011</date>
		<publisheraddress>Los Alamitos</publisheraddress>
		<publisher>IEEE Computer Society</publisher>
		<conferencelocation>Maceió</conferencelocation>
		<keywords>drawing, region-tree, illumination, colorization,animation.</keywords>
		<abstract>Colorization and illumination are key processes for creating animated cartoons. Computer assisted methods have been incorporated in animation/illustration systems to reduce the artists' effort. This paper presents a new strategy for illumination and colorization of 2D drawings based on a region-tree. Starting from a hand-drawn cartoon, it extracts geometric and topological information and builds a tree structure, ensuring independence among parts of the drawing, such as curves and regions. Based on this structure and its attributes, a colorization method that propagates through consecutive frames of animation is proposed, together with an interpolation method that accurately computes a normal mapping for the illumination process. Different operators on curve and region attributes can be applied independently, obtaining different rendering effects.</abstract>
		<language>en</language>
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