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bounding box

The smallest axis-aligned rectangle that contains a shape.

A shape's bounding box is the smallest axis-aligned rectangle containing every point of its boundary -- a cheap, coarse stand-in for a shape's location and extent, used throughout later chapters (object detection, tracking) wherever a full contour is more precision than the task needs.

Examples

  • A detector reports a person's location as the rectangle from (120,40) to (210,300) rather than the full outline of their body.

See also

contour intersection over union (IoU)
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