Transferable Adversarial Attack on 3D Object Tracking in Point Cloud

3D point cloud tracking has recently witnessed considerable progress with deep learning. Such progress, however, mainly focuses on improving tracking accuracy. The risk, especially considering that deep neural network is vulnerable to adversarial perturbations, of a tracker being attacked is often neglected and rarely explored. In order to attract attentions to this potential risk and facilitate the study of robustness in point cloud tracking, we introduce a novel transferable attack network (TAN) to deceive 3D point cloud tracking. Specifically, TAN consists of a 3D adversarial generator, which is trained with a carefully designed multi-fold drift (MFD) loss. The MFD loss considers three common grounds, including classification, intermediate feature and angle drifts, across different 3D point cloud tracking frameworks for perturbation generation, leading to high transferability of TAN for attack. In our extensive experiments, we demonstrate the proposed TAN is able to not only drastically degrade the victim 3D point cloud tracker, i.e., P2B [21], but also effectively deceive other unseen state-of-the-art approaches such as BAT [33] and M-2 Track [34], posing a new threat to 3D point cloud tracking. Code will be available at https://github.com/Xiaoqiong-Liu/TAN.