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Correct usage of euclidean distances in motmetrics.utils.compare_to_groundtruth() #168

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Aug 31, 2022
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Correct usage of euclidean distances in motmetrics.utils.compare_to_groundtruth() #168

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15 changes: 13 additions & 2 deletions motmetrics/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -37,7 +37,8 @@ def compare_to_groundtruth(gt, dt, dist='iou', distfields=None, distth=0.5):
Kwargs
------
dist : str, optional
String identifying distance to be used. Defaults to intersection over union.
String identifying distance to be used. Defaults to intersection over union ('iou'). Euclidean
distance ('euc') and squared euclidean distance ('seuc') are also supported.
distfields: array, optional
Fields relevant for extracting distance information. Defaults to ['X', 'Y', 'Width', 'Height']
distth: float, optional
Expand All @@ -51,9 +52,19 @@ def compute_iou(a, b):
return iou_matrix(a, b, max_iou=distth)

def compute_euc(a, b):
return np.sqrt(norm2squared_matrix(a, b, max_d2=distth**2))

def compute_seuc(a, b):
return norm2squared_matrix(a, b, max_d2=distth)

compute_dist = compute_iou if dist.upper() == 'IOU' else compute_euc
if dist.upper() == 'IOU':
compute_dist = compute_iou
elif dist.upper() == 'EUC':
compute_dist = compute_euc
elif dist.upper() == 'SEUC':
compute_dist = compute_seuc
else:
raise f'Unknown distance metric {dist}. Use "IOU", "EUC" or "SEUC"'

acc = MOTAccumulator()

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