Document image binarization by two-stage block extraction and background intensity determination.

Yi-Hong Tseng Hsi-Jian Lee Document image binarization by two-stage block extraction and background intensity determination. 33-44 2008 11 Pattern Anal. Appl. 1 http://dx.doi.org/10.1007/s10044-007-0077-7 db/journals/paa/paa11.html#TsengL08