Yuan Yan Tang Xinge You Skeletonization of Ribbon-Like Shapes Based on a New Wavelet Function. 1118-1133 2003 25 IEEE Trans. Pattern Anal. Mach. Intell. 9 http://doi.ieeecomputersociety.org/10.1109/TPAMI.2003.1227987 db/journals/pami/pami25.html#TangY03