Compute bounding box overlap ratio

returns
the overlap ratio between each pair of bounding boxes `overlapRatio`

= bboxOverlapRatio(`bboxA`

,`bboxB`

)`bboxA`

and `bboxB`

.
The function returns the `overlapRatio`

value between `0`

and `1`

,
where `1`

implies a perfect overlap.

additionally
lets you specify the method to use for computing the ratio. You must
set the `overlapRatio`

= bboxOverlapRatio(`bboxA`

, `bboxB`

, `ratioType`

)`ratioType`

to either `'Union'`

or `'Min'`

.