通过中心化复制粘贴增强火灾分割数据,提升小样本下火区识别准确率。
Centralized Copy-Paste: Enhanced Data Augmentation Strategy for Wildland Fire Semantic Segmentation
- 从源图提取火区集群,中心化聚焦核心区域后粘贴到目标图
- 在小规模标注数据上显著提升火区分割的像素精度和召回率
- 特别适合火灾监测等关键场景下的小样本语义分割任务
训练语义分割模型需大量标注图像,但在野火科学领域,可靠公开标注数据集稀缺,标注成本高昂。本文提出中心化复制粘贴数据增强方法(CCPDA),旨在提升深度学习多类分割模型对火区的识别能力。该方法包含三步:(i) 在源图像中识别火区簇;(ii) 采用中心化技术聚焦火区核心区域;(iii) 将优化后的火区簇粘贴至目标图像。该策略在保持火区本质特征的同时增加数据多样性。通过加权多目标优化方法对比多种增强手段,验证了其有效性。数值分析表明,该方法显著提升了火区类别的分割性能,相较于其他方法在火区识别上表现更优,尤其适用于标注数据少、火区具有高操作价值的实际场景。
原文摘要 · Abstract (English)
Collecting and annotating images for the purpose of training segmentation models is often cost prohibitive. In the domain of wildland fire science, this challenge is further compounded by the scarcity of reliable public datasets with labeled ground truth. This paper presents the Centralized Copy-Paste Data Augmentation (CCPDA) method, for the purpose of assisting with the training of deep-learning multiclass segmentation models, with special focus on improving segmentation outcomes for the fire-class. CCPDA has three main steps: (i) identify fire clusters in the source image, (ii) apply a centralization technique to focus on the core of the fire area, and (iii) paste the refined fire clusters onto a target image. This method increases dataset diversity while preserving the essential characteristics of the fire class. The effectiveness of this augmentation technique is demonstrated via numerical analysis and comparison against various other augmentation methods using a weighted sum-based multi-objective optimization approach. This approach helps elevate segmentation performance metrics specific to the fire class, which carries significantly more operational significance than other classes (fuel, ash, or background). Numerical performance assessment validates the efficacy of the presented CCPDA method in alleviating the difficulties associated with small, manually labeled training datasets. It also illustrates that CCPDA outperforms other augmentation strategies in the application scenario considered, particularly in improving fire-class segmentation performance.
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