pairwise_ioa

pairwise_ioa(boxes1: Boxes, boxes2: Boxes) -> np.ndarray

• Description:

  pairwise_ioa is a function used to calculate the Intersection over Area (IoA) between two lists of bounding boxes. This function computes the IoA for all N x M pairs of bounding boxes. The input bounding boxes must be of type Boxes.

• Parameters

  • boxes1 (Boxes): The first list of bounding boxes, containing N bounding boxes.
  • boxes2 (Boxes): The second list of bounding boxes, containing M bounding boxes.

• Returns

  • np.ndarray: IoA matrix with shape [N, M].

• Notes

  • IoA is defined as intersection(boxes1, boxes2) / area(boxes2).

• Exceptions

  • TypeError: boxes1 or boxes2 is not Boxes.
  • ValueError: Empty boxes exist (width/height <= 0).

• Example

  import capybara as cb
  
  boxes1 = cb.Boxes([[10, 20, 50, 80], [20, 30, 60, 90]])
  boxes2 = cb.Boxes([[20, 30, 60, 90], [30, 40, 70, 100]])
  ioa = cb.pairwise_ioa(boxes1, boxes2)
  print(ioa)
  # >>> [[0.625 0.33333334]
  #      [1.0 0.625]]