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segment-line: validate intersection with parent #120

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merged 2 commits into from
Apr 8, 2020
Merged

segment-line: validate intersection with parent #120

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segment-line: validate intersection with parent
bertsky Mar 5, 2020
a6659f0
segment-table: use sparse text mode
bertsky Apr 5, 2020
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14 changes: 13 additions & 1 deletion ocrd_tesserocr/segment_line.py
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Original file line number Diff line number Diff line change
Expand Up @@ -111,7 +111,19 @@ def process(self):
line_poly = Polygon(line_polygon)
if not line_poly.within(region_poly):
# this could happen due to rotation
line_poly = line_poly.intersection(region_poly).convex_hull
interline = line_poly.intersection(region_poly)
if interline.is_empty:
continue # ignore this line
if hasattr(interline, 'geoms'):
# is (heterogeneous) GeometryCollection
area = 0
for geom in interline.geoms:
if geom.area > area:
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area = geom.area
interline = geom
if not area:
continue
line_poly = interline.convex_hull
line_polygon = line_poly.exterior.coords
line_polygon = coordinates_for_segment(line_polygon, region_image, region_coords)
line_points = points_from_polygon(line_polygon)
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