iKUN: Speak to Trackers without Retraining
Authors: Yunhao Du, Cheng Lei, Zhicheng Zhao, Fei Su

Referring multi-object tracking (RMOT) aims to track multiple objects based on input textual descriptions. Previous works realize it by simply integrating an extra textual module into the multi-object tracker. However they typically need to retrain the entire framework and have difficulties in optimization. In this work we propose an insertable Knowledge Unification Network termed iKUN to enable communication with off-the-shelf trackers in a plug-and-play manner. Concretely a knowledge unification module (KUM) is designed to adaptively extract visual features based on textual guidance. Meanwhile to improve the localization accuracy we present a neural version of Kalman filter (NKF) to dynamically adjust process noise and observation noise based on the current motion status. Moreover to address the problem of open-set long-tail distribution of textual descriptions a test-time similarity calibration method is proposed to refine the confidence score with pseudo frequency. Extensive experiments on Refer-KITTI dataset verify the effectiveness of our framework. Finally to speed up the development of RMOT we also contribute a more challenging dataset Refer-Dance by extending public DanceTrack dataset with motion and dressing descriptions. The codes and dataset are available at https://github.com/dyhBUPT/iKUN.