min_region_area = 15
min_aspect_ratio = 0.06
max_aspect_ratio = 3
max_eccentricity = 0.995
min_solidity = 0.3
min_region_extent = 0.2
max_region_extent = 0.9
min_euler_number = -4
min_stroke_width_metric = 0.4
expansion_amount = 0.02
thresh_sauvola_window_size = 9
