Online Filtering Training Samples for Robust Visual Tracking

In recent years, discriminative trackers show its great tracking performance, that is mainly due to the online updating using samples collected during tracking. The model could adapt appearance changes of objects and the background well after updating. But these trackers have a serious disadvantage that wrong samples may cause severe model degradation. Most of the training samples in the tracking phase are obtained according to the tracking result of the current frame. Wrong training samples will be collected when the tracking result is inaccurate, seriously affecting the discrimination ability of the model. Besides, partial occlusion also leads to the same problem. In this paper, we propose an optimization module named MetricNet for online filtering training samples. It applies a matching network containing the classification and distance branches, and uses multiple metric methods for different type samples. MetricNet optimizes the training sample set by recognizing wrong and redundant samples, thereby improving the tracking performance. The proposed MetricNet can be regarded as an independent optimization module and integrated into all discriminative trackers updated online. Extensive experiments on three tracking datasets show its effectiveness and generalization ability. After applying MetricNet to MDNet, the tracking result is increased by 5.3% in terms of the success plot on the LaSOT dataset. Our project is available at https://github.com/zj5559/MetricNet.