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72 lines
2.2 KiB
Python
Executable File
72 lines
2.2 KiB
Python
Executable File
import numpy as np
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from shapely.geometry import Polygon
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#import Polygon
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"""
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:param det_x: [1, N] Xs of detection's vertices
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:param det_y: [1, N] Ys of detection's vertices
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:param gt_x: [1, N] Xs of groundtruth's vertices
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:param gt_y: [1, N] Ys of groundtruth's vertices
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##############
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All the calculation of 'AREA' in this script is handled by:
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1) First generating a binary mask with the polygon area filled up with 1's
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2) Summing up all the 1's
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"""
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def area(x, y):
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polygon = Polygon(np.stack([x, y], axis=1))
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return float(polygon.area)
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def approx_area_of_intersection(det_x, det_y, gt_x, gt_y):
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"""
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This helper determine if both polygons are intersecting with each others with an approximation method.
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Area of intersection represented by the minimum bounding rectangular [xmin, ymin, xmax, ymax]
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"""
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det_ymax = np.max(det_y)
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det_xmax = np.max(det_x)
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det_ymin = np.min(det_y)
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det_xmin = np.min(det_x)
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gt_ymax = np.max(gt_y)
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gt_xmax = np.max(gt_x)
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gt_ymin = np.min(gt_y)
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gt_xmin = np.min(gt_x)
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all_min_ymax = np.minimum(det_ymax, gt_ymax)
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all_max_ymin = np.maximum(det_ymin, gt_ymin)
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intersect_heights = np.maximum(0.0, (all_min_ymax - all_max_ymin))
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all_min_xmax = np.minimum(det_xmax, gt_xmax)
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all_max_xmin = np.maximum(det_xmin, gt_xmin)
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intersect_widths = np.maximum(0.0, (all_min_xmax - all_max_xmin))
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return intersect_heights * intersect_widths
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def area_of_intersection(det_x, det_y, gt_x, gt_y):
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p1 = Polygon(np.stack([det_x, det_y], axis=1)).buffer(0)
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p2 = Polygon(np.stack([gt_x, gt_y], axis=1)).buffer(0)
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return float(p1.intersection(p2).area)
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def area_of_union(det_x, det_y, gt_x, gt_y):
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p1 = Polygon(np.stack([det_x, det_y], axis=1)).buffer(0)
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p2 = Polygon(np.stack([gt_x, gt_y], axis=1)).buffer(0)
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return float(p1.union(p2).area)
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def iou(det_x, det_y, gt_x, gt_y):
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return area_of_intersection(det_x, det_y, gt_x, gt_y) / (
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area_of_union(det_x, det_y, gt_x, gt_y) + 1.0)
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def iod(det_x, det_y, gt_x, gt_y):
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"""
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This helper determine the fraction of intersection area over detection area
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"""
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return area_of_intersection(det_x, det_y, gt_x, gt_y) / (
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area(det_x, det_y) + 1.0)
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