Object Detection (YOLO)

Definition

Object detection finds and labels objects with bounding boxes in images.

Powers self-driving cars, CCTV analytics and proctoring.

Diagram

Flowchart

Example: IoU of two boxes

a, b = (0, 0, 2, 2), (1, 1, 3, 3)
iw = max(0, min(a[2], b[2]) - max(a[0], b[0]))
ih = max(0, min(a[3], b[3]) - max(a[1], b[1]))
inter = iw * ih
print(round(inter / (4 + 4 - inter), 3))

Output: 0.143

Key points

• IoU measures box overlap
• mAP evaluates detectors

Interview questions

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