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import math
import numpy as np
class InvalidFormat(Exception):
pass
def segmentation_to_bbox(segmentation):
x1 = min([pt[0] for contour in segmentation for pt in contour])
y1 = min([pt[1] for contour in segmentation for pt in contour])
x2 = max([pt[0] for contour in segmentation for pt in contour])
y2 = max([pt[1] for contour in segmentation for pt in contour])
return (x1, y1, x2, y2)
def cal_cell_bbox(table):
cells_bbox = list()
for cell in table['cells']:
if 'segmentation' not in cell:
cell_bbox = None
else:
segmentation = list()
if 'sublines' in cell:
for subline in cell['sublines']:
segmentation.extend(subline['segmentation'])
if len(segmentation) == 0:
segmentation = cell['segmentation']
if len(segmentation) == 0:
cell_bbox = None
else:
cell_bbox = segmentation_to_bbox(segmentation)
cells_bbox.append(cell_bbox)
return cells_bbox
def cal_cell_spans(table):
layout = table['layout']
num_cells = len(table['cells'])
cells_span = list()
for cell_id in range(num_cells):
cell_positions = np.argwhere(layout == cell_id)
y1 = np.min(cell_positions[:, 0])
y2 = np.max(cell_positions[:, 0])
x1 = np.min(cell_positions[:, 1])
x2 = np.max(cell_positions[:, 1])
assert np.all(layout[y1:y2, x1:x2] == cell_id)
cells_span.append([x1, y1, x2, y2])
return cells_span
def cal_fg_bg_span(spans, edge):
num_span = len(spans)
bg_spans = list()
for idx in range(num_span):
if spans[idx] is None:
continue
if idx == 0:
if spans[idx][0] <= 0:
continue
else:
if spans[idx-1] is None:
continue
if spans[idx][0] <= spans[idx-1][1]:
continue
if idx == num_span - 1:
if spans[idx][1] >= edge:
continue
else:
if spans[idx+1] is None:
continue
if spans[idx][1] >= spans[idx+1][0]:
continue
bg_spans.append(spans[idx])
fg_spans = list()
for idx in range(num_span+1):
if idx == 0:
s = 0
else:
if spans[idx-1] is None:
continue
s = spans[idx-1][1]
if idx == num_span:
e = edge
else:
if spans[idx] is None:
continue
e = spans[idx][0]
if e <= s:
continue
fg_spans.append([s, e])
return fg_spans, bg_spans
def shrink_spans(spans, size):
new_spans = list()
for idx, (start, end) in enumerate(spans):
if idx == 0:
if start <= 0:
start = 1
else:
_, pre_end = spans[idx - 1]
if start <= pre_end:
shrink_distance = pre_end - start + 1
start = start + math.ceil(shrink_distance / 2)
if idx == len(spans) - 1:
if end >= size:
end = size - 1
else:
next_start, _ = spans[idx + 1]
if end >= next_start:
shrink_distance = end - next_start + 1
end = end - math.ceil(shrink_distance / 2)
if end - start < 1:
raise InvalidFormat()
new_spans.append([start, end])
return new_spans
def cal_row_span(table, cells_span, cells_bbox, height):
layout = table['layout']
rows_span = list()
for row_idx in range(layout.shape[0]):
row = layout[row_idx, :]
y1s = list()
y2s = list()
for cell_id in row:
cell_span = cells_span[cell_id]
cell_bbox = cells_bbox[cell_id]
if (cell_span[1] == row_idx) and (cell_bbox is not None):
y1s.append(cell_bbox[1])
if (cell_span[3] == row_idx) and (cell_bbox is not None):
y2s.append(cell_bbox[3])
if (len(y1s) > 0) and (len(y2s) > 0):
y1 = min(max(1, min(y1s)), height-1)
y2 = min(max(1, max(y2s) + 1), height-1)
rows_span.append([y1, y2])
else:
raise InvalidFormat()
rows_span = shrink_spans(rows_span, height)
rows_fg_span, rows_bg_span = cal_fg_bg_span(rows_span, height)
return rows_fg_span, rows_bg_span
def cal_col_span(table, cells_span, cells_bbox, width):
layout = table['layout']
cols_span = list()
for col_idx in range(layout.shape[1]):
col = layout[:, col_idx]
x1s = list()
x2s = list()
for cell_id in col:
cell_span = cells_span[cell_id]
cell_bbox = cells_bbox[cell_id]
if (cell_span[0] == col_idx) and (cell_bbox is not None):
x1s.append(cell_bbox[0])
if (cell_span[2] == col_idx) and (cell_bbox is not None):
x2s.append(cell_bbox[2])
if (len(x1s) > 0) and (len(x2s) > 0):
x1 = min(max(1, min(x1s)), width-1)
x2 = min(max(1, max(x2s) + 1), width-1)
cols_span.append([x1, x2])
else:
raise InvalidFormat()
cols_span = shrink_spans(cols_span, width)
cols_fg_span, cols_bg_span = cal_fg_bg_span(cols_span, width)
return cols_fg_span, cols_bg_span
def extract_fg_bg_spans(table, image_size):
width, height = image_size
cells_bbox = cal_cell_bbox(table)
cells_span = cal_cell_spans(table)
# cal rows fg bg span
rows_fg_span, rows_bg_span = cal_row_span(
table, cells_span, cells_bbox, height
)
# cal cols fg bg span
cols_fg_span, cols_bg_span = cal_col_span(
table, cells_span, cells_bbox, width
)
return rows_fg_span, rows_bg_span, cols_fg_span, cols_bg_span, cells_span
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