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use polygon_for_parent from ocrd_utils #146

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use polygon_for_parent from ocrd_utils #146

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2 changes: 1 addition & 1 deletion ocrd_tesserocr/crop.py
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@
coordinates_of_segment,
bbox_from_polygon,
bbox_from_points,
polygon_for_parent,
polygon_from_bbox,
points_from_polygon,
bbox_from_xywh,
Expand All @@ -27,7 +28,6 @@
from ocrd import Processor

from .config import TESSDATA_PREFIX, OCRD_TOOL
from .segment_region import polygon_for_parent

TOOL = 'ocrd-tesserocr-crop'
LOG = getLogger('processor.TesserocrCrop')
Expand Down
28 changes: 1 addition & 27 deletions ocrd_tesserocr/segment_region.py
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Original file line number Diff line number Diff line change
@@ -1,7 +1,6 @@
from __future__ import absolute_import

import os.path
from shapely.geometry import Polygon
from tesserocr import (
PyTessBaseAPI,
PSM, RIL, PT
Expand All @@ -12,6 +11,7 @@
make_file_id,
assert_file_grp_cardinality,
coordinates_for_segment,
polygon_for_parent,
polygon_from_points,
polygon_from_x0y0x1y1,
points_from_polygon,
Expand All @@ -23,7 +23,6 @@
MetadataItemType,
LabelsType, LabelType,
CoordsType,
PageType,
OrderedGroupType,
ReadingOrderType,
RegionRefIndexedType,
Expand Down Expand Up @@ -304,28 +303,3 @@ def _process_page(self, it, page, page_image, page_coords, page_id):
not og.get_UnorderedGroupIndexed()):
# schema forbids empty OrderedGroup
ro.set_OrderedGroup(None)

def polygon_for_parent(polygon, parent):
"""Clip polygon to parent polygon range.

(Should be moved to ocrd_utils.coordinates_for_segment.)
"""
childp = Polygon(polygon)
if isinstance(parent, PageType):
if parent.get_Border():
parentp = Polygon(polygon_from_points(parent.get_Border().get_Coords().points))
else:
parentp = Polygon([[0,0], [0,parent.get_imageHeight()],
[parent.get_imageWidth(),parent.get_imageHeight()],
[parent.get_imageWidth(),0]])
else:
parentp = Polygon(polygon_from_points(parent.get_Coords().points))
if childp.within(parentp):
return polygon
interp = childp.intersection(parentp)
if interp.is_empty:
# FIXME: we need a better strategy against this
raise Exception("intersection of would-be segment with parent is empty")
if interp.type == 'MultiPolygon':
interp = interp.convex_hull
return interp.exterior.coords[:-1] # keep open