def identify_scanned_page(self, boxes, page_bbox, page_width, page_height):
plane = Plane(page_bbox)
plane.extend(boxes)
cid2obj = [set([i]) for i in range(len(boxes))] # initialize clusters
# default object map to cluster with its own index
obj2cid = list(range(len(boxes)))
prev_clusters = obj2cid
while (True):
for i1, b1 in enumerate(boxes):
for i2, b2 in enumerate(boxes):
box1 = b1.bbox
box2 = b2.bbox
if (box1[0] == box2[0] and box1[2] == box2[2]
and round(box1[3]) == round(box2[1])):
min_i = min(i1, i2)
max_i = max(i1, i2)
cid1 = obj2cid[min_i]
cid2 = obj2cid[max_i]
for obj_iter in cid2obj[cid2]:
cid2obj[cid1].add(obj_iter)
obj2cid[obj_iter] = cid1
cid2obj[cid2] = set()
if (prev_clusters == obj2cid):
break
prev_clusters = obj2cid
clusters = [[boxes[i] for i in cluster]
for cluster in filter(bool, cid2obj)]
if (len(clusters) == 1 and clusters[0][0].bbox[0] < -0.0
and clusters[0][0].bbox[1] <= 0
and abs(clusters[0][0].bbox[2] - page_width) <= 5
and abs(clusters[0][0].bbox[3] - page_height) <= 5):
return True
return False
def group_textlines(self, laparams, lines):
"""Patched class method that fixes empty line aggregation, and allows
run-time line margin detection"""
plane = Plane(self.bbox)
plane.extend(lines)
boxes = {}
for line in lines:
neighbors = line.find_neighbors(plane, laparams.line_margin)
if line not in neighbors or not line.get_text().strip():
continue
# Correct margin to paragraph specific
true_margin = laparams.line_margin
for obj1 in neighbors:
if obj1 is line:
continue
margin = min(abs(obj1.y0 - line.y1), abs(obj1.y1 - line.y0))
margin = margin * 1.05 / line.height
if margin < true_margin:
true_margin = margin
neighbors = line.find_neighbors(plane, true_margin)
if line not in neighbors:
continue
members = []
for obj1 in neighbors:
if not obj1.get_text().strip():
continue
members.append(obj1)
if obj1 in boxes:
members.extend(boxes.pop(obj1))
if isinstance(line, LTTextLineHorizontal):
box = LTTextBoxHorizontal()
else:
box = LTTextBoxVertical()
for obj in uniq(members):
box.add(obj)
boxes[obj] = box
done = set()
for line in lines:
if line not in boxes:
continue
box = boxes[line]
if box in done:
continue
done.add(box)
if not box.is_empty():
yield box
return
def group_textlines(self, laparams: LAParams,
lines: List[LTTextContainer]) -> Generator:
plane = Plane(self.bbox)
plane.extend(lines)
boxes: Dict[LTText, LTTextBox] = {}
for line in lines:
if isinstance(line, LTTextLineHorizontalExtended):
box = LTTextBoxHorizontal()
if self.rsrcmgr:
klass = line.maybe_classify(self.rsrcmgr)
if klass == LTTitle:
self.rsrcmgr.after_title = True
elif not self.rsrcmgr.after_abstract and klass == LTSectionHeader:
self.rsrcmgr.after_abstract = True
elif klass == LTSectionHeader and 'references' in line.get_text(
).lower():
self.rsrcmgr.after_ref = True
box = klass()
else:
box = LTTextBoxVertical()
if not isinstance(box, LTTitle) and not isinstance(
box, LTSectionHeader):
neighbors = line.find_neighbors_with_rsrcmgr(
plane, laparams.line_margin, self.rsrcmgr)
if line not in neighbors:
continue
else:
neighbors = [line]
members = []
for obj1 in neighbors:
members.append(obj1)
if obj1 in boxes:
members.extend(boxes.pop(obj1))
for obj in uniq(members):
box.add(obj)
boxes[obj] = box
done: Set[LTTextBox] = set()
for line in lines:
if line not in boxes:
continue
box = boxes[line]
if box in done:
continue
done.add(box)
if not box.is_empty():
yield box
return
def test_find_neighbors_vertical(self):
laparams = LAParams()
plane = Plane((0, 0, 50, 50))
line = LTTextLineVertical(laparams.word_margin)
line.set_bbox((4, 10, 6, 20))
plane.add(line)
bottom_aligned_right = LTTextLineVertical(laparams.word_margin)
bottom_aligned_right.set_bbox((6, 10, 8, 15))
plane.add(bottom_aligned_right)
top_aligned_left = LTTextLineVertical(laparams.word_margin)
top_aligned_left.set_bbox((2, 15, 4, 20))
plane.add(top_aligned_left)
centrally_aligned_overlapping = LTTextLineVertical(
laparams.word_margin)
centrally_aligned_overlapping.set_bbox((5, 13, 7, 17))
plane.add(centrally_aligned_overlapping)
not_aligned = LTTextLineVertical(laparams.word_margin)
not_aligned.set_bbox((6, 0, 8, 5))
plane.add(not_aligned)
wrong_width = LTTextLineVertical(laparams.word_margin)
wrong_width.set_bbox((6, 10, 10, 15))
plane.add(wrong_width)
neighbors = line.find_neighbors(plane, laparams.line_margin)
self.assertCountEqual(
neighbors,
[
line,
bottom_aligned_right,
top_aligned_left,
centrally_aligned_overlapping,
],
)
def test_find_neighbors_horizontal(self):
laparams = LAParams()
plane = Plane((0, 0, 50, 50))
line = LTTextLineHorizontal(laparams.word_margin)
line.set_bbox((10, 4, 20, 6))
plane.add(line)
left_aligned_above = LTTextLineHorizontal(laparams.word_margin)
left_aligned_above.set_bbox((10, 6, 15, 8))
plane.add(left_aligned_above)
right_aligned_below = LTTextLineHorizontal(laparams.word_margin)
right_aligned_below.set_bbox((15, 2, 20, 4))
plane.add(right_aligned_below)
centrally_aligned_overlapping = LTTextLineHorizontal(
laparams.word_margin)
centrally_aligned_overlapping.set_bbox((13, 5, 17, 7))
plane.add(centrally_aligned_overlapping)
not_aligned = LTTextLineHorizontal(laparams.word_margin)
not_aligned.set_bbox((0, 6, 5, 8))
plane.add(not_aligned)
wrong_height = LTTextLineHorizontal(laparams.word_margin)
wrong_height.set_bbox((10, 6, 15, 10))
plane.add(wrong_height)
neighbors = line.find_neighbors(plane, laparams.line_margin)
self.assertCountEqual(
neighbors,
[
line,
left_aligned_above,
right_aligned_below,
centrally_aligned_overlapping,
],
)
def given_plane_with_one_object(object_size=50, gridsize=50):
bounding_box = (0, 0, 100, 100)
plane = Plane(bounding_box, gridsize)
obj = LTComponent((0, 0, object_size, object_size))
plane.add(obj)
return plane, obj
def __init__(self, mentions, lines, region, min_cell_size=6.0):
"""
Constructor
"""
self.min_cell_size = min_cell_size
vlines, hlines = _split_vlines_hlines(lines)
self.xs = [v.xc for v in vlines]
self.ys = [h.yc for h in hlines]
# Remove closely clustered lines
# Also make sure there is at least 1 mega column for the table
self.xs = _retain_centroids(self.xs + [region.x0, region.x1],
min_cell_size)
self.ys = _retain_centroids(self.ys + [region.y0, region.y1],
min_cell_size)
self.xranges = list(zip(self.xs, self.xs[1:]))
self.yranges = list(zip(self.ys, self.ys[1:]))
self.num_cols = len(self.xranges)
self.num_rows = len(self.yranges)
# Grid contents
self._grid = np.full([self.num_rows, self.num_cols],
None,
dtype=np.dtype(object))
grid = self._grid
# Record whether a particular cell boundary is present
line_plane = Plane(region.bbox)
line_plane.extend(lines)
vbars, hbars = self._mark_grid_bounds(line_plane, region)
cells = []
# Establish cell regions
for i in range(self.num_rows):
for j in range(self.num_cols):
if grid[i, j]:
continue # Skip already marked cells
# Merge with cell above
if i > 0 and not hbars[i, j]:
grid[i, j] = cell = grid[i - 1, j]
cell.rowend = i + 1
# Merge with cell left
elif j > 0 and not vbars[i, j]:
grid[i, j] = cell = grid[i, j - 1]
cell.colend = j + 1
# Create new cell otherwise
else:
grid[i, j] = cell = Cell([i, j])
cells.append(cell)
# Now get the cell's contents by using its boundary
text_plane = Plane(region.bbox)
text_plane.extend(mentions)
for cell in cells:
x0 = self.xs[cell.colstart]
x1 = self.xs[cell.colend]
y0 = self.ys[cell.rowstart]
y1 = self.ys[cell.rowend]
bbox = (x0, y0, x1, y1)
# Keep mentions whose centers are inside the cell
cell.texts = [
m for m in text_plane.find(bbox)
if inside(bbox, (m.xc, m.yc) * 2)
]
# TODO: provide HTML conversion here
self.get_normalized_grid()
def cluster_vertically_aligned_boxes(boxes, page_bbox, avg_font_pts, width,
char_width, boxes_segments, boxes_curves,
boxes_figures, page_width, combine):
# Too many "." in the Table of Content pages
if (len(boxes) == 0 or len(boxes) > 3500):
return []
plane = Plane(page_bbox)
plane.extend(boxes)
cid2obj = [set([i]) for i in xrange(len(boxes))] # initialize clusters
obj2cid = range(
len(boxes)) # default object map to cluster with its own index
prev_clusters = obj2cid
while (True):
for i1, b1 in enumerate(boxes):
for i2, b2 in enumerate(boxes):
if ((i1 == i2) or (obj2cid[i1] == obj2cid[i2])):
continue
if (b1.bbox[1] < b2.bbox[1]):
box1 = b1.bbox
box2 = b2.bbox
elif (b2.bbox[1] < b1.bbox[1]):
box1 = b2.bbox
box2 = b1.bbox
else:
# horizontally aligned
continue
if (
box2[1] < box1[3]
or (box2[1] - box1[1] < 1.5 * avg_font_pts)
or (box2[3] - box1[3] < 1.5 * avg_font_pts)
): # can probably do better if we find the average space between words
if (abs(box1[0] - box2[0]) < 3
or abs(box1[2] - box2[2]) < 3
or (((box1[0] + box1[2]) / 2)
== ((box2[0] + box2[2]) / 2))
or ((box1[0] < box2[0]) and (box1[2] > box2[0])) or
((box1[0] > box2[0]) and
(box2[2] > box1[0]))): # added center alignemnt
min_i = min(i1, i2)
max_i = max(i1, i2)
cid1 = obj2cid[min_i]
cid2 = obj2cid[max_i]
# move all objects from cluster cid2 to cid1
# reassign cluster ids for all such objects as well
for obj_iter in cid2obj[cid2]:
cid2obj[cid1].add(obj_iter)
obj2cid[obj_iter] = cid1
cid2obj[cid2] = set()
if (prev_clusters == obj2cid):
break
prev_clusters = obj2cid
clusters = [[boxes[i] for i in cluster]
for cluster in filter(bool, cid2obj)]
rid2obj = [set([i]) for i in xrange(len(boxes))] # initialize clusters
obj2rid = range(
len(boxes)) # default object map to cluster with its own index
prev_clusters = obj2rid
while (True):
for i1, b1 in enumerate(boxes):
for i2, b2 in enumerate(boxes):
if ((i1 == i2) or (obj2rid[i1] == obj2rid[i2])):
continue
box1 = b1.bbox
box2 = b2.bbox
if ((abs(box1[1] - box2[1]) < 0.11 * avg_font_pts)
or ((abs(box1[3] - box2[3]) < 0.11 * avg_font_pts))
or (round((box1[1] + box1[3]) / 2) == round(
(box2[1] + box2[3]) / 2))):
min_i = min(i1, i2)
max_i = max(i1, i2)
rid1 = obj2rid[min_i]
rid2 = obj2rid[max_i]
for obj_iter in rid2obj[rid2]:
rid2obj[rid1].add(obj_iter)
obj2rid[obj_iter] = rid1
rid2obj[rid2] = set()
if (prev_clusters == obj2rid):
break
prev_clusters = obj2rid
not_merge = set()
for i1, b1 in enumerate(boxes):
for i2 in cid2obj[obj2cid[i1]]:
if (i1 == i2):
continue
row1 = obj2rid[i1]
row2 = obj2rid[i2]
if (row1 == row2):
continue
if (b1.bbox[1] < b2.bbox[1]):
box1 = b1.bbox
box2 = b2.bbox
elif (b2.bbox[1] < b1.bbox[1]):
box1 = b2.bbox
box2 = b1.bbox
else:
# horizontally aligned
continue
text_1 = 0.0
for obj in rid2obj[row1]:
text_1 += boxes[obj].bbox[2] - boxes[obj].bbox[0]
text_2 = 0.0
for obj in rid2obj[row2]:
text_2 += boxes[obj].bbox[2] - boxes[obj].bbox[0]
if (abs(text_1 - text_2) / width > 0.1):
min_i = min(i1, i2)
max_i = max(i1, i2)
not_merge.add((min_i, max_i))
# Alignment Features
# If text boxes are very close in a row
if_row_connected = defaultdict(int)
num_row_connected = defaultdict(lambda: 1)
# If text is merged using span code in adjacent rows, this feature tells the number of times the cluster went through span based clustering
if_connected_by_span = defaultdict(int)
num_connected_by_span = defaultdict(lambda: 1)
# If columns were merged using cluster alignment
if_connected_by_align = defaultdict(int)
num_connected_by_align = defaultdict(lambda: 1)
# If vertical columns were merged
if_vertical_columns_merged = defaultdict(int)
num_vertical_columns_merged = defaultdict(lambda: 1)
# Number of Line Segments, Curves and Figures
num_segments = defaultdict(int)
num_curves = defaultdict(int)
num_figures = defaultdict(int)
# Average Word Space
total_word_space = defaultdict(float)
avg_word_space = defaultdict(float)
avg_word_space_norm = defaultdict(float)
node_space = defaultdict(float)
avg_node_space = defaultdict(float)
avg_node_space_norm = defaultdict(float)
cid2obj = [set([i]) for i in xrange(len(boxes))] # initialize clusters
obj2cid = range(
len(boxes)) # default object map to cluster with its own index
prev_clusters = obj2cid
# add the code for merging close text boxes in particular row
while (True):
for i1, b1 in enumerate(boxes):
for i2, b2 in enumerate(boxes):
if ((i1 == i2) or (obj2cid[i1] == obj2cid[i2])):
continue
box1 = b1.bbox
box2 = b2.bbox
if (obj2rid[i1] == obj2rid[i2]):
if (((b1.bbox[0] < b2.bbox[0]) and
((b2.bbox[0] - b1.bbox[2]) <= 2 * char_width)) or
((b2.bbox[0] < b1.bbox[0]) and
((b1.bbox[0] - b2.bbox[2]) <= 2 * char_width))):
min_i = min(i1, i2)
max_i = max(i1, i2)
cid1 = obj2cid[min_i]
cid2 = obj2cid[max_i]
for obj_iter in cid2obj[cid2]:
cid2obj[cid1].add(obj_iter)
obj2cid[obj_iter] = cid1
cid2obj[cid2] = set()
# Features
if_row_connected[cid1] = 1
if_row_connected[cid2] = 0
num_row_connected[cid1] += num_row_connected[cid2]
num_row_connected[cid2] = 0
if (prev_clusters == obj2cid):
break
prev_clusters = obj2cid
# vertical alignment code
while (True):
for i1, b1 in enumerate(boxes):
for i2, b2 in enumerate(boxes):
if ((i1 == i2) or (obj2cid[i1] == obj2cid[i2])):
continue
if (b1.bbox[1] < b2.bbox[1]):
box1 = b1.bbox
box2 = b2.bbox
elif (b2.bbox[1] < b1.bbox[1]):
box1 = b2.bbox
box2 = b1.bbox
else:
# horizontally aligned
continue
if (
box2[1] < box1[3]
or (box2[1] - box1[1] < 1.5 * avg_font_pts)
or (box2[3] - box1[3] < 1.5 * avg_font_pts)
): # can probably do better if we find the average space between words
if (
abs(box1[0] - box2[0]) < 3
or abs(box1[2] - box2[2]) < 3
or (((box1[0] + box1[2]) / 2)
== ((box2[0] + box2[2]) / 2))
): # or ((box1[0]<box2[0]) and (box1[2]>box2[0])) or ((box1[0]>box2[0]) and (box2[2]>box1[0]))): #added center alignemnt
min_i = min(i1, i2)
max_i = max(i1, i2)
if ((min_i, max_i) not in not_merge):
cid1 = obj2cid[min_i]
cid2 = obj2cid[max_i]
# move all objects from cluster cid2 to cid1
# reassign cluster ids for all such objects as well
for obj_iter in cid2obj[cid2]:
cid2obj[cid1].add(obj_iter)
obj2cid[obj_iter] = cid1
cid2obj[cid2] = set()
# Features
if_connected_by_span[cid1] = 1
if_connected_by_span[cid2] = 0
if (if_row_connected[cid1] == 1
or if_row_connected[cid2] == 1):
if_row_connected[cid1] = 1
num_row_connected[cid1] += num_row_connected[
cid2]
num_row_connected[cid2] = 0
if_row_connected[cid2] = 0
num_connected_by_span[
cid1] = num_connected_by_span[
cid1] + num_connected_by_span[cid2]
num_connected_by_span[cid2] = 0
if (prev_clusters == obj2cid):
break
prev_clusters = obj2cid
# blacklist nearly half-page wide clusters before horizontal merging
cid2obj2 = cid2obj[:]
obj2cid2 = obj2cid[:]
blacklist = set()
blacklist_obj = set()
for cid_iter in range(len(cid2obj2)):
cid = cid2obj2[cid_iter]
xmin = float("Inf")
xmax = float("-Inf")
for obj in cid:
xmin = min(xmin, boxes[obj].bbox[0])
xmax = max(xmax, boxes[obj].bbox[2])
if (((xmax - xmin) > width / 2.75 and (xmax - xmin) < width / 2)
or ((xmax - xmin) > 0.9 * width)):
blacklist.add(cid_iter)
for obj in cid:
blacklist_obj.add(obj)
for obj_iter in rid2obj[obj2rid[obj]]:
if (boxes[obj_iter].bbox[0] >= xmin
and boxes[obj_iter].bbox[2] <= xmax):
blacklist_obj.add(obj_iter)
# create a cluster span
cid2span = {}
for cid in range(len(cid2obj)):
cid2span[cid] = {}
cid2span[cid]["min_x"] = float("Inf")
cid2span[cid]["min_y"] = float("Inf")
cid2span[cid]["max_x"] = float("-Inf")
cid2span[cid]["max_y"] = float("-Inf")
for obj in cid2obj[cid]:
cid2span[cid]["min_x"] = min(cid2span[cid]["min_x"],
boxes[obj].bbox[0])
cid2span[cid]["max_x"] = max(cid2span[cid]["max_x"],
boxes[obj].bbox[2])
cid2span[cid]["min_y"] = min(cid2span[cid]["min_y"],
boxes[obj].bbox[1])
cid2span[cid]["max_y"] = max(cid2span[cid]["max_y"],
boxes[obj].bbox[3])
cid2cid = {}
cid_pair_compared = set()
cid2cid2 = [cid for cid in range(len(cid2obj))]
for i1, b1 in enumerate(boxes):
for i2, b2 in enumerate(boxes):
if (i1 == i2):
continue
if (i1 in blacklist_obj or i2 in blacklist_obj):
continue
cid1 = obj2cid[i1]
cid2 = obj2cid[i2]
if ((min(cid1, cid2), max(cid1, cid2)) in cid_pair_compared):
continue
if (cid1 == cid2):
continue
if (obj2rid[i1] == obj2rid[i2]):
continue
if (cid1 not in cid2cid):
cid2cid[cid1] = set()
if (cid2 not in cid2cid):
cid2cid[cid2] = set()
if (cid2span[cid1]["min_y"] < cid2span[cid2]["min_y"]):
box1 = [
cid2span[cid1]["min_x"], cid2span[cid1]["min_y"],
cid2span[cid1]["max_x"], cid2span[cid1]["max_y"]
]
box2 = [
cid2span[cid2]["min_x"], cid2span[cid2]["min_y"],
cid2span[cid2]["max_x"], cid2span[cid2]["max_y"]
]
else:
box1 = [
cid2span[cid2]["min_x"], cid2span[cid2]["min_y"],
cid2span[cid2]["max_x"], cid2span[cid2]["max_y"]
]
box2 = [
cid2span[cid1]["min_x"], cid2span[cid1]["min_y"],
cid2span[cid1]["max_x"], cid2span[cid1]["max_y"]
]
if (((box1[1] < box2[1]) and (box1[3] > box2[1]))
or ((box1[1] > box2[1]) and (box1[1] < box2[3]))):
continue
cid_pair_compared.add((min(cid1, cid2), max(cid1, cid2)))
query_rect = (min(box1[0], box2[0]), min(box1[1], box2[1]),
max(box1[2], box2[2]), max(box1[3], box2[3]))
connected = True
for i3, b3 in enumerate(boxes):
if ((i3 == i1) or (i3 == i2)):
continue
if (obj2cid[i1] == obj2cid[i3] or obj2cid[i2] == obj2cid[i3]):
continue
box3 = b3.bbox
if (intersect(query_rect, box3)):
connected = False
break
if (
((round(box1[0]) == round(box2[0])
or round(box1[2]) == round(box2[2])) and connected)
or (round((box1[0] + box1[2]) / 2) == round(
(box2[0] + box2[2]) / 2) and connected)
): # or (abs((box1[0]+box1[2])/2-(box2[0]+box2[2])/2)<0.1*char_width and connected)):# or ((box1[0]<box2[0]) and (box1[2]>box2[0])) or ((box1[0]>box2[0]) and (box2[2]>box1[0]))): #added center alignemnt
cid2cid[min(cid1, cid2)].add(max(cid1, cid2))
min_cid = min(cid1, cid2)
max_cid = max(cid1, cid2)
for cid_iter in cid2cid2:
if (cid2cid2[cid_iter] == cid2cid2[max_cid]):
cid2cid2[cid_iter] = cid2cid2[min_cid]
# post-process cid2cid
cid2obj2 = cid2obj[:]
obj2cid2 = obj2cid[:]
for cid in range(len(cid2cid2)):
cid_merge = cid2cid2[cid]
if (cid != cid_merge):
for obj_iter in cid2obj2[cid]:
cid2obj2[cid_merge].add(obj_iter)
obj2cid2[obj_iter] = cid_merge
cid2obj2[cid] = set()
# Features
if_connected_by_align[cid_merge] = 1
if_connected_by_align[cid] = 0
if (if_row_connected[cid_merge] == 1
or if_row_connected[cid] == 1):
if_row_connected[cid_merge] = 1
num_row_connected[cid_merge] += num_row_connected[cid]
num_row_connected[cid] = 0
if_row_connected[cid2] = 0
if (if_connected_by_span[cid_merge] == 1
or if_connected_by_span[cid] == 1):
if_connected_by_span[cid_merge] = 1
num_connected_by_span[cid_merge] += num_connected_by_span[cid]
num_connected_by_span[cid] = 0
if_connected_by_span[cid] = 0
num_connected_by_align[cid_merge] += num_connected_by_align[cid]
num_connected_by_align[cid] = 0
# code to merge columns for table
prev_clusters = obj2cid2
while (True):
for obj1, b1 in enumerate(boxes):
cid1 = obj2cid2[obj1]
rid1 = obj2rid[obj1]
if (cid1 in blacklist):
continue
if (obj1 in blacklist_obj):
continue
for obj2, b2 in enumerate(boxes):
if (obj1 == obj2):
continue
if (obj2cid2[obj2] == cid1):
rid2 = obj2rid[obj2]
if (rid1 == rid2):
continue
for obj3 in rid2obj[rid2]:
cid3 = obj2cid2[obj3]
if (obj3 in blacklist_obj):
continue
if (cid1 != cid3):
for obj4 in cid2obj2[cid3]:
if (obj4 == obj3):
continue
if (obj2rid[obj4] == rid1):
min_cid = min(cid1, cid3)
max_cid = max(cid1, cid3)
for obj_iter in cid2obj2[max_cid]:
cid2obj2[min_cid].add(obj_iter)
obj2cid2[obj_iter] = min_cid
cid2obj2[max_cid] = set()
# Features
if_vertical_columns_merged[min_cid] = 1
if_vertical_columns_merged[max_cid] = 0
num_vertical_columns_merged[
min_cid] += num_vertical_columns_merged[
max_cid]
num_vertical_columns_merged[max_cid] = 0
if (if_row_connected[min_cid] == 1
or if_row_connected[max_cid] == 1):
if_row_connected[min_cid] = 1
num_row_connected[
min_cid] += num_row_connected[
max_cid]
num_row_connected[max_cid] = 0
if_row_connected[max_cid] = 0
if (if_connected_by_span[min_cid] == 1
or if_connected_by_span[max_cid]
== 1):
if_connected_by_span[min_cid] = 1
num_connected_by_span[
min_cid] += num_connected_by_span[
max_cid]
num_connected_by_span[max_cid] = 0
if_connected_by_span[max_cid] = 0
if (if_connected_by_align[min_cid] == 1
or if_connected_by_align[max_cid]
== 1):
if_connected_by_align[min_cid] = 1
num_connected_by_align[
min_cid] += num_connected_by_align[
max_cid]
num_connected_by_align[max_cid] = 0
if_connected_by_align[max_cid] = 0
break
if (prev_clusters == obj2cid2):
break
prev_clusters = obj2cid2
clusters = [[boxes[i] for i in cluster]
for cluster in filter(bool, cid2obj2)]
nodes = [Node(elems) for elems in clusters]
node_indices = [i for i, x in enumerate(cid2obj2) if x]
# for idx in range(len(nodes)):
# print idx, node_indices[idx], nodes[idx]
merge_indices = [i for i in range(len(node_indices))]
page_stat = Node(boxes)
nodes, merge_indices = merge_nodes(nodes, plane, page_stat, merge_indices)
# Features
for idx in range(len(merge_indices)):
if (merge_indices[idx] != idx):
cid1 = node_indices[merge_indices[idx]]
cid2 = node_indices[idx]
if (if_row_connected[cid1] == 1 or if_row_connected[cid2] == 1):
if_row_connected[cid1] = 1
num_row_connected[cid1] += num_row_connected[cid2]
num_row_connected[cid2] = 0
if_row_connected[cid2] = 0
if (if_connected_by_span[cid1] == 1
or if_connected_by_span[cid2] == 1):
if_connected_by_span[cid1] = 1
num_connected_by_span[cid1] += num_connected_by_span[cid2]
num_connected_by_span[cid2] = 0
if_connected_by_span[cid2] = 0
if (if_connected_by_align[cid1] == 1
or if_connected_by_align[cid2] == 1):
if_connected_by_align[cid1] = 1
num_connected_by_align[cid1] += num_connected_by_align[cid2]
num_connected_by_align[cid2] = 0
if_connected_by_align[cid2] = 0
if (if_vertical_columns_merged[cid1] == 1
or if_vertical_columns_merged[cid2] == 1):
if_vertical_columns_merged[cid1] = 1
num_vertical_columns_merged[
cid1] += num_vertical_columns_merged[cid2]
num_vertical_columns_merged[cid2] = 0
if_vertical_columns_merged[cid2] = 0
# Get Word Spacing Features
rid2space = defaultdict(float)
rid2space_norm = defaultdict(float)
row_indices = [i for i, x in enumerate(rid2obj) if x]
for rid in row_indices:
obj_list = list(rid2obj[rid])
if (len(obj_list) == 1):
rid2space[rid] = 0
continue
obj_boxes = [boxes[obj].bbox[0] for obj in obj_list]
sorted_obj_idx = [
i[0] for i in sorted(enumerate(obj_boxes), key=lambda x: x[1])
]
for obj_idx in range(len(sorted_obj_idx) - 1):
rid2space[rid] += boxes[obj_list[sorted_obj_idx[obj_idx + 1]]].bbox[2] - \
boxes[obj_list[sorted_obj_idx[obj_idx]]].bbox[0]
rid2space_norm[rid] = rid2space[rid] / (len(obj_list) - 1)
for idx, node in enumerate(nodes):
node_idx = node_indices[idx]
if (merge_indices[idx] == idx):
obj_list = []
for idx_iter in range(len(merge_indices)):
if (merge_indices[idx_iter] == idx):
obj_list += list(cid2obj2[node_indices[idx_iter]])
obj_list = list(set(obj_list))
rid_list = list(set([obj2rid[obj] for obj in obj_list]))
for rid in rid_list:
total_word_space[node_idx] += rid2space[rid]
avg_word_space_norm[node_idx] += rid2space_norm[rid]
obj_boxes = [
boxes[obj].bbox[0] for obj in rid2obj
if obj in cid2obj2[node_idx]
]
sorted_obj_idx = [
i[0]
for i in sorted(enumerate(obj_boxes), key=lambda x: x[1])
]
for obj_idx in range(len(sorted_obj_idx) - 1):
node_space[node_idx] += boxes[obj_list[sorted_obj_idx[obj_idx + 1]]].bbox[2] - \
boxes[obj_list[sorted_obj_idx[obj_idx]]].bbox[0]
avg_node_space_norm[node_idx] += node_space[node_idx] / (
len(obj_boxes) - 1)
avg_word_space[node_idx] = total_word_space[node_idx] / len(
rid_list)
avg_word_space_norm[node_idx] /= len(rid_list)
avg_node_space[node_idx] = node_space[node_idx] / len(rid_list)
avg_node_space_norm[node_idx] /= len(rid_list)
new_nodes = []
new_node_indices = []
for idx in range(len(merge_indices)):
if (merge_indices[idx] == idx):
new_nodes.append(nodes[idx])
new_node_indices.append(node_indices[idx])
nodes = new_nodes
node_indices = new_node_indices
# Features
for idx, node in enumerate(nodes):
node_idx = node_indices[idx]
node_bbox = (node.x0, node.y0, node.x1, node.y1)
for i1, b1 in enumerate(boxes_segments):
if (intersect(node_bbox, b1.bbox)):
num_segments[node_idx] += 1
for i1, b1 in enumerate(boxes_figures):
if (intersect(node_bbox, b1.bbox)):
num_figures[node_idx] += 1
for i1, b1 in enumerate(boxes_curves):
if (intersect(node_bbox, b1.bbox)):
num_curves[node_idx] += 1
tables = []
table_indices = []
for idx, node in enumerate(nodes):
node_idx = node_indices[idx]
isTable = True
if node.is_table():
for elem in node.elems:
if ("table" in elem.get_text().lower()):
continue
if ((node.width - elem.bbox[2] + elem.bbox[0]) <
2 * char_width):
isTable = False
if (isTable):
tables.append(node)
table_indices.append(node_idx)
if (combine == True):
node_features = [0] * 17
for idx, node in enumerate(nodes):
node_idx = node_indices[idx]
node_features = [
sum(x) for x in zip(node_features, [
if_row_connected[node_idx], num_row_connected[node_idx],
if_connected_by_span[node_idx],
num_connected_by_span[node_idx],
if_connected_by_align[node_idx],
num_connected_by_align[node_idx],
if_vertical_columns_merged[node_idx],
num_vertical_columns_merged[node_idx],
num_segments[node_idx], num_curves[node_idx],
num_figures[node_idx], total_word_space[node_idx],
avg_word_space[node_idx], avg_word_space_norm[node_idx],
node_space[node_idx], avg_node_space[node_idx],
avg_node_space_norm[node_idx]
])
]
return [], node_features
else:
table_features = []
for idx, table in enumerate(tables):
table_idx = table_indices[idx]
table_features += [[
if_row_connected[table_idx], num_row_connected[table_idx],
if_connected_by_span[table_idx],
num_connected_by_span[table_idx],
if_connected_by_align[table_idx],
num_connected_by_align[table_idx],
if_vertical_columns_merged[table_idx],
num_vertical_columns_merged[table_idx],
num_segments[table_idx], num_curves[table_idx],
num_figures[table_idx], total_word_space[table_idx],
avg_word_space[table_idx], avg_word_space_norm[table_idx],
node_space[table_idx], avg_node_space[table_idx],
avg_node_space_norm[table_idx]
]]
return tables, table_features