Recently, discriminatively learned correlation filters (DCF) has drawn much attention in visual object tracking community. The success of DCF is potentially attributed to the fact that a large amount of samples are utilized to train the ridge regression model and predict the location of object. To solve the regression problem in an efficient way, these samples are all generated by circularly shifting from a search patch. However, these synthetic samples also induce some negative effects which decrease the robustness of DCF based trackers. In this paper, we propose a Convolutional Regression framework for visual tracking (CRT). Instead of learning the linear regression model in a closed form, we try to solve the regression problem by optimizing a one-channel-output convolution layer with Gradient Descent (GD). In particular, the receptive field size of the convolution layer is set to the size of object. Contrary to DCF, it is possible to incorporate all "real" samples clipped from the whole image. A critical issue of the GD approach is that most of the convolutional samples are negative and the contribution of positive samples will be submerged. To address this problem, we propose a novel Automatic Hard Negative Mining method to eliminate easy negatives and enhance positives. Extensive experiments are conducted on a widely-used benchmark with 100 sequences. The results show that the proposed algorithm achieves outstanding performance and outperforms almost all the existing DCF based algorithms.

本文提出了一种卷积回归框架（Convolutional Regression framework），并采用梯度下降法（Gradient Descent）对一个仅输出单通道的卷积层进行优化，以解决视觉物体跟踪的线性回归问题。相较于基于切片生成合成样本的区别相关滤波（Discriminatively Learned Correlation Filters，DCF），“卷积回归框架”可以利用整个图像剪裁出的所有实际样本进行跟踪，同时还提出了新的 “自动化难反例挖掘（Automatic Hard Negative Mining）”方法来排除容易算法的反例以提升跟踪效果。在广泛使用的100个序列中进行了大量实验，结果表明该算法实现了卓越的性能，并优于几乎所有现有的基于DCF的算法。

卷积回归用于视觉跟踪