A Computer-Assisted Colorization Algorithm based on Topological Difference

@article{Bezerra2006ACC,
  title={A Computer-Assisted Colorization Algorithm based on Topological Difference},
  author={Hedlena M. de A. Bezerra and Bruno Feij{\'o} and Luiz Velho},
  journal={2006 19th Brazilian Symposium on Computer Graphics and Image Processing},
  year={2006},
  pages={71-77}
}
Region-based approaches to cel painting typically use shape similarity and topology relations between regions of consecutive animation frames. This paper presents a new colorization algorithm based on topological differences defined over a hierarchical graph of adjacent regions, which allows an almost full automatic colorization process. Also this paper discusses other attributes that improve the solution of the image association problem 
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