Jie Qiu 0002 Hock Soon Seah Feng Tian Quan Chen Zhongke Wu Enhanced auto coloring with hierarchical region matching. 463-473 2005 16 Journal of Visualization and Computer Animation 3-4 http://dx.doi.org/10.1002/cav.86 db/journals/jvca/jvca16.html#QiuSTCW05