Robust Reading Competition, retrieved May 31st, 2005 from http://algoval.essex.ac.uk/icdar/RobustWord.html.
R. Casey and E. Lecolinet, "A survey of methods and strategies in character segmentation", IEEE Trans. On Pattern Analysis and Mach. Intel., vol.18, 1996, pp.690-706.
H. Kim, "Segmentation-Free Printed Character Recognition by Relaxed Nearest Neighbor Learning of Windowed Operator", Proc. Sibgrapi - Brazilian Symp. on Comp. Graph. and Image Proc., 1999, pp. 195-204.
C. Thillou and B. Gosselin, "Color Binarization for complex camera-based images", Proc. of the Electronic Imaging Conference of SPIE/IS&T, 2005, pp. 301-308.
D.H. Hubel, "Eye, Brain, and Vision", Scientific American Library, no22, 1988.
D.J. Field, "Relations between the statistics of natural images and the response properties of cortical cells", Jour. of the Optical Society of America, 1987, pp. 2379-2394.
P. Kovesi, "Image Features From Phase Congruency", Videre: A Journal of Computer Vision Research, vol. 1, 1999.
N. Otsu, "A thresholding selection method from gray-level histogram", IEEE Trans. on Systems, Man, and Cybernetics, 1979, pp. 62-66.