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Filter too small segments in coco converter #321

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merged 2 commits into from
Apr 1, 2019
+15 −5
Merged

Filter too small segments in coco converter #321

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1b0b456
Add filtering of small segments
Feb 13, 2019
5062a32
Add polygon-area-threshold command line argument
Feb 18, 2019
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9 changes: 7 additions & 2 deletions utils/coco/converter.py
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Original file line number Diff line number Diff line change
Expand Up @@ -52,11 +52,12 @@ def parse_args():
return parser.parse_args()


def mask_to_polygon(mask, tolerance=1.0):
def mask_to_polygon(mask, tolerance=1.0, area_threshold=5):
"""Convert object's mask to polygon [[x1,y1, x2,y2 ...], [...]]
Args:
mask: object's mask presented as 2D array of 0 and 1
tolerance: maximum distance from original points of polygon to approximated
area_threshold: if area of a polygon is less than this value, remove this small object
"""
polygons = []
# pad mask with 0 around borders
Expand All @@ -77,7 +78,11 @@ def mask_to_polygon(mask, tolerance=1.0):
for i in range(0, len(reshaped_contour)):
if reshaped_contour[i] < 0:
reshaped_contour[i] = 0
polygons.append(reshaped_contour)
# Check if area of a polygon is enough
rle = mask_util.frPyObjects([reshaped_contour], mask.shape[0], mask.shape[1])
area = mask_util.area(rle)
if sum(area) > area_threshold:
polygons.append(reshaped_contour)
return polygons

def draw_polygons(polygons, img_name, input_dir, output_dir, draw_labels):
Expand Down