Objectness Score
Understanding Objectness in Object Detection Models (Medium)
What is it?
It measures the probability of an object to exist in a proposed RoI.
High objectness -> image window likely contains an object
If an image has high objectness, we expect it to have:
Uniqueness in the whole image
Tight boundaries around the object
Different appearance to its surroundings
How is it computed
This score objectness score is given based on the IoU or Intersection-over-Union. The min value is 0 and the max is 1.
It's the ratio between:
the area of intersection between the anchor box and the GT bbox
the area of the union of both boxes.
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