title: Computer-assisted coloring and illuminating based on a region-tree structure.
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' workload. This paper presents a new method for illumination and colorization of 2D drawings based on a region- tree representation. Starting from a hand-drawn cartoon, the proposed method 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, combined with an interpolation method that accurately computes a normal mapping for the illumination process. Different operators for curve and region attributes can be applied independently, obtaining different rendering effects.
authors.affiliation: Department of Mathematics, PUC-Rio, Rio de Janeiro, Brazil.
authors.forename: Renata
authors.initials: R
authors.lastname: Nascimento
authors.forename: Fabiane
authors.initials: F
authors.lastname: Queiroz
authors.forename: Allan
authors.initials: A
authors.lastname: Rocha
authors.forename: Tsang Ing
authors.initials: TI
authors.lastname: Ren
authors.forename: Vinicius
authors.initials: V
authors.lastname: Mello
authors.forename: Adelailson
authors.initials: A
authors.lastname: Peixoto
keywords: 2D drawing; Animation; Colorization; Illumination; Region-tree