IoU divides the overlap area of two boxes by their combined area. A detection counts as correct when its IoU with the ground-truth box clears a threshold, often 0.5. It also drives non-max suppression and tracker matching.
Definition
Intersection over Union — how much a predicted box overlaps the true box, 0 to 1. The yardstick for 'is this detection correct?'
IoU divides the overlap area of two boxes by their combined area. A detection counts as correct when its IoU with the ground-truth box clears a threshold, often 0.5. It also drives non-max suppression and tracker matching.
Also known as
intersection over union, Jaccard index
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