some questions in utils.augmentations.py

[YingdiZhang]

in line 9:
def intersect(box_a, box_b):
max_xy = np.minimum(box_a[:, 2:], box_b[2:])
min_xy = np.maximum(box_a[:, :2], box_b[:2])
inter = np.clip((max_xy - min_xy), a_min=0, a_max=np.inf)
return inter[:, 0] * inter[:, 1]
what is the meaning of box_a and box_b? dose it means four coordinates of bounding box？
（xmin，ymin，xmax，ymax） . And what exactly does max_xy and min_xy mean? I am a little confused here.

[zhangkaij]

the coordinates of bounding box is (xmin, ymin, xmax, ymax). max_xy and min_xy is to calculate the coordinate of overlapping regions. max_xy is the coordinates of the top left corner point and the min_xy is the coordinates of the lower right point.

[YingdiZhang]

thans for your reply！it seems box_a is a 2D array, dose box_a represent a set of bounding boxes while box_b represent only one bounding box？ @zhangkaij

[zhangkaij]

both them are a set of bounding boxes