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Self-intersection handling #961

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merged 2 commits into from
Nov 5, 2023
Merged

Self-intersection handling #961

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64e1534
Self-intersection handling
sergiev Nov 3, 2023
c0bc45f
Merge branch 'main' into patch-1
fcakyon Nov 5, 2023
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8 changes: 8 additions & 0 deletions sahi/utils/coco.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,8 @@
from typing import Dict, List, Optional, Set, Union

import numpy as np
from shapely import MultiPolygon
from shapely.validation import make_valid
from tqdm import tqdm

from sahi.utils.file import is_colab, load_json, save_json
Expand Down Expand Up @@ -223,6 +225,12 @@ def __init__(

def get_sliced_coco_annotation(self, slice_bbox: List[int]):
shapely_polygon = box(slice_bbox[0], slice_bbox[1], slice_bbox[2], slice_bbox[3])
samp = self._shapely_annotation.multipolygon
if not samp.is_valid:
valid = make_valid(samp)
if not isinstance(valid, MultiPolygon):
valid = MultiPolygon([valid])
self._shapely_annotation.multipolygon = valid
intersection_shapely_annotation = self._shapely_annotation.get_intersection(shapely_polygon)
return CocoAnnotation.from_shapely_annotation(
intersection_shapely_annotation,
Expand Down