Robust Tracking via Fully Exploring Background Prior Knowledge

Typical Siamese-based trackers focus on the target region and pay less attention to the background area. However, the background area can provide the tracker with prior knowledge about the target surroundings. Nonetheless, since the tracker can naturally utilize the target template for localization, importing additional background knowledge requires proper design so that the background area prior knowledge can be fully explored. Furthermore, the introduction of the entire background regions is redundant. Instead, the part background distractors in the regions are more meaningful for the discrimination of the tracker. In this work, we propose a background prior knowledge fully explored tracker for robust tracking. Firstly, we present a Transformer-based explicitly and fully background-utilizing scheme by boosting the tracker to independently exploit the background for localization. Specifically, a target-distractor independent decoder explicitly utilizes the background knowledge by making the target and the distractors independently perform fusion with the search feature. Secondly, we design a simple yet efficient discriminative distractors mining module to refine the background prior knowledge by replacing the whole background region with the mined background distractors. Extensive experiments demonstrate that the proposed method performs favorably against state-of-the-art trackers on nine benchmarks.