SiamSampler: Video-Guided Sampling for Siamese Visual Tracking

We present SiamSampler, the first to our knowledge investigating video sampling in visual object tracking. We observe that the random sampling applied in Siamese-based trackers cannot focus on important data or ensure data diversity, hindering the effective training of networks. This paper proposes the Video-Guided Sampling Strategy to solve the problems in random sampling from both inter and intra-video levels. At the inter-video level, we propose Modified Gaussian Sampling Strategy (MGSS) to automatically assign higher sampling probabilities to longer and more difficult videos and reduce the sampling probabilities of shorter and easier videos. At the intra-video level, the Farthest Image Pair Sampling Strategy (FPSS) is proposed to increase the diversity of training data. Extensive experiments on general benchmarks demonstrate the effectiveness of our method. Compared with the baseline model, our method improves tracking performance on five datasets, without affecting the testing speed.