About the angle of rbox

[lz20061213]

Thanks great work!
I have a question about the angle of rbox:
In the paper, i find the angle regression term is . Does the angle of GT rbox (for example, HRSC2016 dataset) in this paper ranges from -90 to 90?

[ming71]

thanks for your attention. The angle range in this implementation is (-45 , 45]

[lz20061213]

:( Thanks, I still cofused about the definitation about GT angle. As i see, there has many represtations：

1. opencv, form R3Det, range [-90, 0), but the width of a ship will not be the largest side
2. straightforward, range from [0, 360), direction of a ship with x-axis, anticlockwise, the width is largest side, height another
3. ...
   if the GT angle is [-90, 0) or (-45, 45]，how to judge the direction?

[ming71]

The angle value uniquely determines the oriented rectangle under a specific definition method. In addition, the meaning of the angle value under different definition methods is also different.

[lz20061213]

That's right，but in such situation, is the angle same for 1 and 2 (or 3 and 4)?

[ming71]

1=2, 3=4, 2!=3

[lz20061213]

1=2, 3=4, 2!=3

Got it. Thanks a lot!