Yoon, Ilhoon Kwon, Hyeongjun Kim, Jin Park, Junyoung Jang, Hyunsung Sohn, Kwanghoon 2024-12-30T03:00:17Z 2024-12-30T03:00:17Z 2024-12-13 2024-09 0302-9743 https://pubs.kist.re.kr/handle/201004/151424 Source-Free domain adaptive Object Detection (SFOD) is a promising strategy for deploying trained detectors to new, unlabeled domains without accessing source data, addressing significant concerns around data privacy and efficiency. Most SFOD methods leverage a Mean-Teacher (MT) self-training paradigm relying heavily on High-confidence Pseudo Labels (HPL). However, these HPL often overlook small instances that undergo significant appearance changes with domain shifts. Additionally, HPL ignore instances with low confidence due to the scarcity of training samples, resulting in biased adaptation toward familiar instances from the source domain. To address this limitation, we introduce the Low-confidence Pseudo Label Distillation (LPLD) loss within the Mean-Teacher based SFOD framework. This novel approach is designed to leverage the proposals from Region Proposal Network (RPN), which potentially encompasses hard-to-detect objects in unfamiliar domains. Initially, we extract HPL using a standard pseudo-labeling technique and mine a set of Low-confidence Pseudo Labels (LPL) from proposals generated by RPN, leaving those that do not overlap significantly with HPL. These LPL are further refined by leveraging class-relation information and reducing the effect of inherent noise for the LPLD loss calculation. Furthermore, we use feature distance to adaptively weight the LPLD loss to focus on LPL containing a larger foreground area. Our method outperforms previous SFOD methods on four cross-domain object detection benchmarks. Extensive experiments demonstrate that our LPLD loss leads to effective adaptation by reducing false negatives and facilitating the use of domain-invariant knowledge from the source model. Code is available at https://github.com/junia3/LPLD. English SPRINGER INTERNATIONAL PUBLISHING AG Enhancing Source-Free Domain Adaptive Object Detection with Low-Confidence Pseudo Label Distillation Conference 10.1007/978-3-031-72907-2_20 1 18th European Conference on Computer Vision (ECCV), v.15142, pp.337 - 353 18th European Conference on Computer Vision (ECCV) 15142 337 353 IT Milan, ITALY 2024-09-29 COMPUTER VISION - ECCV 2024, PT LXXXIV 001352890300020 2-s2.0-85208567712