juniorComputer Vision
What is IoU in object detection?
Updated May 15, 2026
Short answer
IoU measures overlap between predicted and ground truth bounding boxes.
Deep explanation
IoU = area of overlap / area of union. It evaluates detection accuracy.
Real-world example
Evaluating pedestrian detection in autonomous cars.
Common mistakes
- Ignoring IoU thresholds in evaluation.
Follow-up questions
- What is a good IoU threshold?
- How is IoU used in NMS?