how to define whether a targer is fast or slow?

[Jee-King]

Hi, thanks for your great datasets.

In OTB, Fast Motion is defined as the motion of the ground truth is larger than tm pixels (tm=20). How do you define whether the target is fast or slow in LaSOT? Is it same with OTB？ or calculate it as: where pi denotes the object center location and si = sqrt(wihi) represents the object size.

Thanks！

[HengLan]

Hi, Jee-King,

Thanks for your interest. In LaSOT, the FM is defined as "The motion of the target is larger than the size (size=sqrt(w^2+h^2)) of its bounding box". Check Table 2 in the paper for definition.

Thanks.

[Jee-King]

the FM is defined as:

i and i+1 represent two adjacent frames. In a video sequence, if this video is defined the FM. is it right?

[HengLan]

Your understanding of FM (the above equation) is correct. The P_i denotes the center point of the target in frame (i). For the bottom equation, I believe this should be right. Since a video is labeled with FM if FM happens in any one frame.

[Jee-King]

Thank you very much :rose:

[HengLan]

No problem. Glad it helps :)