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Table 2 Comparison of PSNR for seven methods

From: An innovative document image binarization approach driven by the non-local p-Laplacian

PSNR 2009 2010 2011 2012 Average
OTSU [3] 15.17 16.85 13.86 14.40 15.07
Niblack [5] 8.08 8.19 7.76 8.34 8.09
Bernsen [4] 4.55 4.14 4.50 3.98 4.29
Sauvola et al. [6] 15.16 15.34 15.22 14.83 15.14
Singh et al. [8] 12.99 14.99 13.69 13.28 13.74
Lu et al. [9] 15.86 16.81 14.69 16.25 15.90
Proposed 17.41 18.60 17.56 18.81 18.09