A Graph Association Motion-Aware Tracker for Tiny Object in Satellite Videos

Satellite video object tracking involves tracking a specified tiny object within a wide scene. The insufficient appearance features of these tiny objects pose significant challenges to appearance-based object trackers, particularly in situations involving occlusion, target blur, and similar interferences. In this paper, a novel Graph Association MOtion-aware tracker (GAMO) is proposed for tiny object in satellite videos, which integrates motion and spatial relationship information. First, a Gaussian motion estimator is proposed that decouples motion into velocity and direction, rather than using traditional x-y movement modeling. This estimator predicts the object's position and estimates motion uncertainty with a directional motion probability map. Furthermore, the estimated motion serves as a prior to guide the proposal sampling. A probabilistic proposal sampling module is designed that samples candidate bounding boxes according to the directional motion probability map, focusing on the region where the target is most likely to appear. Additionally, we implement a graph association module to model and propagate the spatial relationships between the target and neighboring objects over time. This relationship information assists the appearance features in distinguishing the target from similar interferences. Experiments on the Skysat-1, SV248S, and VISO datasets demonstrate the superiority of the proposed tracker. GAMO leverages motion and surrounding information, resulting in significant improvements with minimal computational overhead. The code and results will be publicly available in https://github.com/Midkey/GAMO.