def compute_separators_morph(binary,scale,sepwiden=10,maxseps=2):
"""Finds vertical black lines corresponding to column separators."""
d0 = int(max(5,scale/4))
d1 = int(max(5,scale))+sepwiden
thick = morph.r_dilation(binary,(d0,d1))
vert = morph.rb_opening(thick,(10*scale,1))
vert = morph.r_erosion(vert,(d0//2,sepwiden))
vert = morph.select_regions(vert,sl.dim1,min=3,nbest=2*maxseps)
vert = morph.select_regions(vert,sl.dim0,min=20*scale,nbest=maxseps)
return vert
def compute_separators_morph(binary, scale, sepwiden, maxseps):
"""Finds vertical black lines corresponding to column separators."""
d0 = int(max(5, scale / 4))
d1 = int(max(5, scale)) + sepwiden
thick = morph.r_dilation(binary, (d0, d1))
vert = morph.rb_opening(thick, (10 * scale, 1))
vert = morph.r_erosion(vert, (d0 // 2, sepwiden))
vert = morph.select_regions(vert, sl.dim1, min=3, nbest=2 * maxseps)
vert = morph.select_regions(vert, sl.dim0, min=20 * scale, nbest=maxseps)
return vert
def compute_separators_morph_horizontal(binary, scale, widen=True):
"""Finds vertical black lines corresponding to column separators."""
span = 4
d0 = span #int(max(5, scale / 5))
if widen:
d1 = span + 1
else:
d1 = span
thick = morph.r_dilation(binary, (d1, d0))
hor = morph.r_opening(thick, (1, int(4 * scale)))
hor = morph.r_erosion(hor, (span, d0 // 2))
return hor
def compute_separators_morph_vertical(binary, scale, widen=True):
"""Finds vertical black lines corresponding to column separators."""
span = 3 #min(5, int(scale * 0.2))
d0 = span
if widen:
d1 = span + 1
else:
d1 = span
thick = morph.r_dilation(binary, (d0, d1))
vert = morph.r_opening(thick, (int(2 * scale), 1))
vert = morph.r_erosion(vert, (d0 // 2, span))
return vert
def compute_colseps_morph(binary, scale, maxseps=3, minheight=20, maxwidth=5):
"""Finds extended vertical whitespace corresponding to column separators
using morphological operations."""
boxmap = psegutils.compute_boxmap(binary, scale, (0.4, 5), dtype='B')
bounds = morph.rb_closing(B(boxmap), (int(5 * scale), int(5 * scale)))
bounds = maximum(B(1 - bounds), B(boxmap))
cols = 1 - morph.rb_closing(boxmap, (int(20 * scale), int(scale)))
cols = morph.select_regions(cols, sl.aspect, min=args.csminaspect)
cols = morph.select_regions(cols,
sl.dim0,
min=args.csminheight * scale,
nbest=args.maxcolseps)
cols = morph.r_erosion(cols, (int(0.5 + scale), 0))
cols = morph.r_dilation(cols, (int(0.5 + scale), 0),
origin=(int(scale / 2) - 1, 0))
return cols
def compute_colseps_morph(self, binary, scale):
"""Finds extended vertical whitespace corresponding to column separators
using morphological operations."""
boxmap = psegutils.compute_boxmap(binary, scale, dtype='B')
bounds = morph.rb_closing(B(boxmap), (int(5 * scale), int(5 * scale)))
bounds = np.maximum(B(1 - bounds), B(boxmap))
cols = 1 - morph.rb_closing(boxmap, (int(20 * scale), int(scale)))
cols = morph.select_regions(cols,
sl.aspect,
min=self.parameter['csminaspect'])
cols = morph.select_regions(cols,
sl.dim0,
min=self.parameter['csminheight'] * scale,
nbest=self.parameter['maxcolseps'])
cols = morph.r_erosion(cols, (int(0.5 + scale), 0))
cols = morph.r_dilation(cols, (int(0.5 + scale), 0),
origin=(int(scale / 2) - 1, 0))
return cols
