Convolutional neural network-based approaches for semantic segmentation rely on supervision with pixel-level ground truth, but may not generalize well to unseen image domains. As the labeling process is tedious and labor intensive, developing algorithms that can adapt source ground truth labels to the target domain is of great interest. In this paper, we propose an adversarial learning method for domain adaptation in the context of semantic segmentation. Considering semantic segmentations as structured outputs that contain spatial similarities between the source and target domains, we adopt adversarial learning in the output space. To further enhance the adapted model, we construct a multi-level adversarial network to effectively perform output space domain adaptation at different feature levels. Extensive experiments and ablation study are conducted under various domain adaptation settings, including synthetic-to-real and cross-city scenarios. We show that the proposed method performs favorably against the state-of-the-art methods in terms of accuracy and visual quality.

本文提出了一种基于对抗学习的语义分割领域适应方法，该方法采用输出空间的对抗学习，并构建了多层对抗网络来有效地执行不同特征层面的输出空间域适应。在各种域适应设置下进行了大量实验和消融研究，并展示出该方法在准确性和视觉质量方面表现优越。

学习适应语义分割的结构化输出空间