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arXiv 2007.02277cs.CVeess.IV
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基于弱监督领域自适应的航卫影像建筑物区域分割

Weakly Supervised Domain Adaptation for Built-up Region Segmentation in Aerial and Satellite Imagery

Information Technology University(信息技术大学)

Javed Iqbal, Mohsen Ali

摘要:

本文提出了一种新的领域自适应算法来处理卫星和航空图像所带来的挑战,并证明了其有效性的建筑物区域分割问题。建筑面积估算是理解人类对环境的影响、公共政策的影响和一般城市人口分析的重要组成部分。航空和卫星图像的多样性以及缺乏覆盖这种多样性的标记数据使得机器学习算法难以概括这些任务,特别是在多个领域。另一方面,由于缺乏强的空间上下文和结构,与地面图像相比,现有的无监督领域自适应方法的应用导致次优适应。我们深入研究了现有的领域自适应方法的局限性,并提出了一个弱监督的适应策略,我们假设图像级标签可用于目标域。更具体地说,我们设计了一个内置的区域分割网络(作为编码器-解码器),添加了一个图像分类头来指导自适应。设计的系统能够解决多个卫星和航空图像数据集的视觉差异的问题,从高分辨率(HR)到非常高的分辨率(VHR)。通过手工标记卢旺达的73.4平方公里,创建了一个现实而具有挑战性的HR数据集,捕获了不同地形上的各种建筑结构。与现有数据集相比,开发的数据集空间丰富,涵盖了各种建筑场景,包括森林和沙漠中的建筑区,泥屋,锡和彩色屋顶。通过自适应单源域进行了大量的实验,以分割出目标域。与现有的最先进的方法相比,我们在IoU中实现了11.6%-52%的高增益。

英文摘要:

This paper proposes a novel domain adaptation algorithm to handle the challenges posed by the satellite and aerial imagery, and demonstrates its effectiveness on the built-up region segmentation problem. Built-up area estimation is an important component in understanding the human impact on the environment, the effect of public policy, and general urban population analysis. The diverse nature of aerial and satellite imagery and lack of labeled data covering this diversity makes machine learning algorithms difficult to generalize for such tasks, especially across multiple domains. On the other hand, due to the lack of strong spatial context and structure, in comparison to the ground imagery, the application of existing unsupervised domain adaptation methods results in the sub-optimal adaptation. We thoroughly study the limitations of existing domain adaptation methods and propose a weakly-supervised adaptation strategy where we assume image-level labels are available for the target domain. More specifically, we design a built-up area segmentation network (as encoder-decoder), with an image classification head added to guide the adaptation. The devised system is able to address the problem of visual differences in multiple satellite and aerial imagery datasets, ranging from high resolution (HR) to very high resolution (VHR). A realistic and challenging HR dataset is created by hand-tagging the 73.4 sq-km of Rwanda, capturing a variety of build-up structures over different terrain. The developed dataset is spatially rich compared to existing datasets and covers diverse built-up scenarios including built-up areas in forests and deserts, mud houses, tin, and colored rooftops. Extensive experiments are performed by adapting from the single-source domain, to segment out the target domain. We achieve high gains ranging 11.6%-52% in IoU over the existing state-of-the-art methods.

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