The prevalent approach in domain adaptive object detection adopts a two-stage architecture (Faster R-CNN) that involves a number of hyper-parameters and hand-crafted designs such as anchors, region pooling, non-maximum suppression, etc. Such architecture makes it very complicated while adopting certain existing domain adaptation methods with different ways of feature alignment. In this work, we adopt a one-stage detector and design DA-DETR, a simple yet effective domain adaptive object detection network that performs inter-domain alignment with a single discriminator. DA-DETR introduces a hybrid attention module that explicitly pinpoints the hard-aligned features for simple yet effective alignment across domains. It greatly simplifies traditional domain adaptation pipelines by eliminating sophisticated routines that involve multiple adversarial learning frameworks with different types of features. Despite its simplicity, extensive experiments show that DA-DETR demonstrates superior accuracy as compared with highly-optimized state-of-the-art approaches.

设计了 DA-DETR，一种域自适应物体检测变压器，引入信息融合以实现从一个带标记的源域到一个未标记的目标域的有效传输，并采用 CTBlender 对卷积神经网络特征和变换器特征进行聚合。在多个广泛采用的域自适应基准测试中，DA-DETR 不断实现卓越的检测性能。

DA-DETR: 带信息融合的领域自适应检测变压器