def compute_separators_morph(binary, scale, sepwiden=10, maxcolseps=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*maxcolseps)
vert = morph.select_regions(vert, sl.dim0, min=20*scale, nbest=maxcolseps)
return vert
def compute_separators_morph(binary: np.array, scale: float, sepwiden: int = 10, maxcolseps: int = 2) -> np.array:
"""Finds vertical black lines corresponding to column separators."""
logger.debug(u'Finding vertical black column lines')
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*maxcolseps)
vert = morph.select_regions(vert, sl.dim0, min=20*scale, nbest=maxcolseps)
return vert
def compute_colseps_conv(binary, scale=1.0, minheight=10, maxcolseps=2):
"""Find column separators by convolution and thresholding.
Args:
binary (numpy.array):
scale (float):
minheight (int):
maxcolseps (int):
Returns:
Separators
"""
h, w = binary.shape
# find vertical whitespace by thresholding
smoothed = gaussian_filter(1.0*binary, (scale, scale*0.5))
smoothed = uniform_filter(smoothed, (5.0*scale, 1))
thresh = (smoothed < np.amax(smoothed)*0.1)
# find column edges by filtering
grad = gaussian_filter(1.0*binary, (scale, scale*0.5), order=(0, 1))
grad = uniform_filter(grad, (10.0*scale, 1))
grad = (grad > 0.5*np.amax(grad))
# combine edges and whitespace
seps = np.minimum(thresh, maximum_filter(grad, (int(scale), int(5*scale))))
seps = maximum_filter(seps, (int(2*scale), 1))
# select only the biggest column separators
seps = morph.select_regions(seps, sl.dim0, min=minheight*scale,
nbest=maxcolseps+1)
return seps
def compute_separators_morph(binary: np.array,
scale: float,
sepwiden: int = 10,
maxcolseps: int = 2) -> np.array:
"""Finds vertical black lines corresponding to column separators."""
logger.debug('Finding vertical black column lines')
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 * maxcolseps)
vert = morph.select_regions(vert,
sl.dim0,
min=20 * scale,
nbest=maxcolseps)
return vert
