From [30 - Hei Law, Jia Deng: CornerNet: Detecting Objects as Paired Keypoints]:
image816×773 252 KB
So the reference without comment how they do something different would seem to indicate that they do something very similar, i.e. I expect them to see how much you can move the bounding box (keeping the size the same, if they only consider the center, I guess) while keeping IoU >= 0.7. Without some thought, I wouldn’t know whether axial or some diagonal translation is crucial, but you could experiment with that. This would be the radius. Then you could take 1/3 like in the reference or so.
Whether that is exactly what they do, I don’t know. However, I would expect to get radii that look somewhat similar to the ones pictured.
Best regards
Thomas