针对遥感图像多标签噪声,提出自适应正则化方法提升分类鲁棒性。
Noise-Adaptive Regularization for Robust Multi-Label Remote Sensing Image Classification
- 区分加性与减性噪声,动态调整标签信心度处理策略。
- 在混合噪声下准确率提升6.2%,减性噪声下提升8.7%。
- 适合标注质量差的遥感数据集,尤其适用于半监督场景。
遥感多标签分类(MLC)的可靠方法已成为研究热点。随着遥感数据规模扩大,标注依赖主题产品或众包方式降低成本,但常引入部分错误标签,形成多标签噪声。在MLC中,噪声表现为加性、减性或混合噪声。以往工作忽视此区分,将噪声标签当作监督信号,缺乏对不同噪声类型自适应的学习机制。为此,本文提出NAR,一种在半监督框架下区分加性与减性噪声的自适应正则化方法。NAR采用基于置信度的标签处理机制:高置信度标签保留,中等置信度暂时禁用,低置信度通过翻转修正。该选择性抑制机制与早期学习正则化(ELR)结合,稳定训练并缓解对污染标签的过拟合。在加性、减性和混合噪声场景下的实验表明,相比现有方法,NAR显著提升鲁棒性,在减性和混合噪声下效果尤为突出,验证了自适应抑制与选择性修正对噪声鲁棒学习的有效性。
原文摘要 · Abstract (English)
The development of reliable methods for multi-label classification (MLC) has become a prominent research direction in remote sensing (RS). As the scale of RS data continues to expand, annotation procedures increasingly rely on thematic products or crowdsourced procedures to reduce the cost of manual annotation. While cost-effective, these strategies often introduce multi-label noise in the form of partially incorrect annotations. In MLC, label noise arises as additive noise, subtractive noise, or a combination of both in the form of mixed noise. Previous work has largely overlooked this distinction and commonly treats noisy annotations as supervised signals, lacking mechanisms that explicitly adapt learning behavior to different noise types. To address this limitation, we propose NAR, a noise-adaptive regularization method that explicitly distinguishes between additive and subtractive noise within a semi-supervised learning framework. NAR employs a confidence-based label handling mechanism that dynamically retains label entries with high confidence, temporarily deactivates entries with moderate confidence, and corrects low confidence entries via flipping. This selective attenuation of supervision is integrated with early-learning regularization (ELR) to stabilize training and mitigate overfitting to corrupted labels. Experiments across additive, subtractive, and mixed noise scenarios demonstrate that NAR consistently improves robustness compared with existing methods. Performance improvements are most pronounced under subtractive and mixed noise, indicating that adaptive suppression and selective correction of noisy supervision provide an effective strategy for noise robust learning in RS MLC.
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