BoundaryIOU for very small objects

[sauradip]

Congratulations for the awesome work!

I have a doubt which is - How will the boundaries be generated if the objects are very small ? I observed, that it does not generate boundaries for let say a very small square mask of size 2 x 2.

[bowenc0221]

Because the size of the boundary is independent on the size of the object (we find this is a good property of Boundary IoU), if the boundary size is larger than the object size, we keep the original mask according to the math in our paper.