Faisal Shafait Daniel Keysers Thomas M. Breuel Performance Evaluation and Benchmarking of Six-Page Segmentation Algorithms. 941-954 2008 30 IEEE Trans. Pattern Anal. Mach. Intell. 6 http://doi.ieeecomputersociety.org/10.1109/TPAMI.2007.70837 db/journals/pami/pami30.html#ShafaitKB08