#duplicates

Question 1: Single choice

Two detections overlap the same ground-truth car: one with confidence 0.9 and IoU 0.8, the other with confidence 0.7 and IoU 0.6. With an IoU threshold of 0.5, how are they counted when precision is computed?

The 0.9 detection is a true positive and the 0.7 detection a false positive1
Each is a true positive, since each has an IoU over 0.52
Each is a false positive, since the car was detected twice3
The 0.7 detection is ignored, counting neither as a true nor as a false positive4

Timed test