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International Journal of Computer Games Technology
Volume 2008, Article ID 135398, 7 pages
Research Article

Auto Coloring with Enhanced Character Registration

1Interaction and Entertainment Research Center, School of Computer Engineering, Nanyang Technological University, 50 Nanyang Drive, Singapore 637553
2College of Information Science and Technology, Beijing Normal University, Beijing 100875, China

Received 27 July 2007; Accepted 2 October 2007

Academic Editor: Kevin Kok Wai Wong

Copyright © 2008 Jie Qiu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


An enhanced character registration method is proposed in this paper to assist the auto coloring for 2D animation characters. After skeletons are extracted, the skeleton of the character in a target frame is relocated based on a stable branch in a reference frame. Subsequently the characters among a sequence are automatically matched and registered. Occlusion are then detected and located in certain components segmented from the character. Two different approaches are applied to color regions in components without and with occlusion respectively. The approach has been tested for coloring a practical animation sequence and achieved high coloring accuracy, showing its applicability in commercial animation production.