Deep neural networks, albeit their great success on feature learning in various computer vision tasks, are usually considered as impractical for online visual tracking because they require very long training time and a large number of training samples. In this work, we present an efficient and very robust tracking algorithm using a single Convolutional Neural Network (CNN) for learning effective feature representations of the target object, in a purely online manner. Our contributions are multifold: First, we introduce a novel truncated structural loss function that maintains as many training samples as possible and reduces the risk of tracking error accumulation. Second, we enhance the ordinary Stochastic Gradient Descent approach in CNN training with a robust sample selection mechanism. The sampling mechanism randomly generates positive and negative samples from different temporal distributions, which are generated by taking the temporal relations and label noise into account. Finally, a lazy yet effective updating scheme is designed for CNN training. Equipped with this novel updating algorithm, the CNN model is robust to some long-existing difficulties in visual tracking such as occlusion or incorrect detections, without loss of the effective adaption for significant appearance changes. In the experiment, our CNN tracker outperforms all compared state-of-the-art methods on two recently proposed benchmarks which in total involve over 60 video sequences. The remarkable performance improvement over the existing trackers illustrates the superiority of the feature representations which are learned

本研究提出了一种利用单个卷积神经网络（CNN）实现在纯在线模式下学习目标对象有效特征表示的高效且非常强大的跟踪算法，其利用一种新颖的截断结构损失函数、稳健的样本选择机制和一种懒但有效的更新算法，使CNN在视觉跟踪中对遮挡或错误检测等难以处理的问题具有鲁棒性，在实验中，与现有跟踪器相比，该算法可以提高性能。

DeepTrack：在线学习区分性特征表示以实现鲁棒的视觉跟踪