Recently the problem of cross-domain object detection has started drawing attention in the computer vision community. In this paper, we propose a novel unsupervised cross-domain detection model that exploits the annotated data in a source domain to train an object detector for a different target domain. The proposed model mitigates the cross-domain representation divergence for object detection by performing cross-domain feature alignment in two dimensions, the depth dimension and the spatial dimension. In the depth dimension of channel layers, it uses inter-channel information to bridge the domain divergence with respect to image style alignment. In the dimension of spatial layers, it deploys spatial attention modules to enhance detection relevant regions and suppress irrelevant regions with respect to cross-domain feature alignment. Experiments are conducted on a number of benchmark cross-domain detection datasets. The empirical results show the proposed method outperforms the state-of-the-art comparison methods.

本文提出一种新颖的无监督跨领域检测模型，在源域中利用标注数据训练一个针对不同目标域的物体探测器，通过在两个维度上进行跨领域特征对齐，即深度和空间维度，来缓解物体检测中的跨领域表示差异。实验证明该模型胜过现有的比较方法。

跨领域目标检测的二维特征对齐