基于监督对比学习正则化的高分辨率SAR图像建筑物提取方法

康健; 王智睿; 祝若鑫; 孙显

doi:10.12000/JR21124

基于监督对比学习正则化的高分辨率SAR图像建筑物提取方法

doi: 10.12000/JR21124

康健¹,
王智睿^{2, 5, ,},
祝若鑫³,
孙显^{2, 4, 5}

1.
苏州大学电子信息学院苏州 215006
2.
中国科学院空天信息创新研究院北京 100190
3.
西安测绘研究所地理信息工程国家重点实验室西安 710054
4.
中国科学院大学电子电气与通信工程学院北京 100190
5.
中国科学院网络信息体系技术科技创新重点实验室 100190

基金项目: 国家自然科学基金(62101371, 62076241)，江苏省青年基金项目(BK20210707)

详细信息

作者简介:
康　健(1991–)，男，2019年在慕尼黑工业大学获得博士学位，现任苏州大学电子信息学院副教授，硕士生导师，IEEE会员，雷达学报客座编辑。主要研究方向为遥感图像智能解译

王智睿(1990–)，男，2018年在清华大学获得博士学位，现任中国科学院空天信息创新研究院助理研究员。主要研究方向为SAR图像智能解译

祝若鑫(1991–)，男，德国工学博士(Dr.-Ing.)，西安测绘研究所助理研究员。主要研究方向为社会感知和时空数据挖掘

孙　显(1981–)，男，中国科学院空天信息创新研究院研究员，博士生导师，IEEE高级会员，雷达学报青年编委。主要研究方向为计算机视觉与遥感图像理解

通讯作者:
王智睿 zhirui1990@126.com

责任主编：刘畅 Corresponding Editor: LIU Chang
中图分类号: TP753
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- 被引次数: 0
出版历程
- 收稿日期: 2021-09-07
- 修回日期: 2021-11-12
- 网络出版日期: 2021-12-03
- 刊出日期: 2022-02-28

Supervised Contrastive Learning Regularized High-resolution Synthetic Aperture Radar Building Footprint Generation

KANG Jian¹,
WANG Zhirui^{2, 5
, ,},
ZHU Ruoxin³,
SUN Xian^{2, 4, 5}

1.
School of Electronic and Information Engineering, Soochow University, Suzhou 215006, China
2.
Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China
3.
State Key Laboratory of Geo-Information Engineering, Xi’an Research Institute of Surveying and Mapping, Xi’an 710054, China
4.
School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100190, China
5.
Key Laboratory of Network Information System Technology (NIST), Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China

Funds: The National Natural Science Foundation of China (62101371, 62076241), Jiangsu Province Science Foundation for Youths (BK20210707)

More Information

Corresponding author: WANG Zhirui, zhirui1990@126.com

摘要

摘要: 近年来，高分辨合成孔径雷达(SAR)图像的智能解译技术在城市规划、变化监测等方面得到了广泛应用。不同于光学图像，SAR图像的获取方式、图像中目标的几何结构等因素制约了现有深度学习方法对SAR图像地物目标的解译效果。该文针对高分辨SAR图像城市区域建筑物提取，提出了基于监督对比学习的正则化方法，其主要思想是增强同一类别像素在特征空间中的相似性以及不同类别像素之间的差异性，使得深度学习模型能更加关注SAR图像中建筑物与非建筑物区域在特征空间中的区别，从而提升建筑物识别精度。利用公开的大场景SpaceNet6数据集，通过对比实验，提出的正则化方法，其建筑物提取精度相比于常用的分割方法在不同网络结构下至少提升1%，分割结果证明了该文方法在实际数据上的有效性，可以对复杂场景下的城市建筑物区域进行有效分割。此外，该方法也可以拓展应用于其他SAR图像像素级别的地物分割任务中。
- 合成孔径雷达 /
- SAR建筑物提取 /
- 深度学习 /
- 语义分割 /
- 对比学习
Abstract: Over the recent years, high-resolution Synthetic-Aperture Radar (SAR) images have been widely applied for intelligent interpretation of urban mapping, change detection, etc. Different from optical images, the acquisition approach and object geometry of SAR images have limited the interpretation performances of the existing deep-learning methods. This paper proposes a novel building footprint generation method for high-resolution SAR images. This method is based on supervised contrastive learning regularization, which aims to increase the similarities between intra-class pixels and diversities of interclass pixels. This increase will make the deep learning models focus on distinguishing building and nonbuilding pixels in latent space, and improve the classification accuracy. Based on public SpaceNet6 data, the proposed method can improve the segmentation performance by 1% compared to the other state-of-the-art methods. This improvement validates the effectiveness of the proposed method on real data. This method can be used for building segmentation in urban areas with complex scene background. Moreover, the proposed method can be extended for other types of land-cover segmentation using SAR images.
- Synthetic Aperture Radar (SAR) /
- SAR building footprint generation /
- Deep learning /
- Semantic segmentation /
- Contrastive learning

HTML全文

图 1 监督对比学习正则化的SAR图像建筑物提取模型示意图

Figure 1. Supervised contrastive learning regularized SAR building footprint segmentation model

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图 2 城市地区的多模态遥感图像

Figure 2. Multi-modality remote sensing images for urban areas

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图 3 对比学习特征空间中的难易特征

Figure 3. The easy and hard query feature vectors for contrastive learning

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图 4 本文所采用的常用的DeepLabV3+与UNet网络结构

Figure 4. The CNN architectures of DeepLabV3+ and UNet exploited in this paper

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图 5 SpaceNet6城市地区全极化SAR图像(分辨率：0.5 m)

Figure 5. Examples of SpaceNet6 full polarization SAR images (Resolution: 0.5 m)

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图 6 不同方法的建筑物提取结果

Figure 6. Different methods for building footprint extraction of SAR images

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图 7 提出算法选取到的难查询像素：第1行为输入SAR图像，第2行为像素预测类别的置信度，颜色越深表示置信度越低

Figure 7. Selection of hard query pixels: The first row is the input SAR images and the second row shows the classification confidences

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图 8 DeepLabV3+[ResNet50]模型在有与没有对比损失正则化下得到建筑物区域像素特征之间的相似性直方图

Figure 8. The histogram of the feature similarities among the building pixels obtained by the trained DeepLabV3+[ResNet50] models with and without the contrastive loss

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图 9 不同查询及键像素数量对所提出方法的敏感性分析(采用DeepLabV3+网络结构)

Figure 9. The sensitivity analysis of the proposed method under different numbers of query and key pixels (The CNN architecture of DeepLabV3+ is adopted)

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图 10 所提出方法得到的大范围城市地区建筑物提取结果(DeepLabV3+[ResNet50])

Figure 10. The large-scale urban building extraction result based on the proposed method (DeepLabV3+[ResNet50])

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表 1 训练过程采用的数据增强方法

Table 1. Adopted data augmentation methods for training

数据增强	数值
随机裁剪	512×512
水平翻转	0.5
归一化	均值：128 方差：32

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表 2 训练过程中的参数设定

Table 2. Other parameters for training

参数	数值
M_q	256
M_k	512
$ \tau $	0.1
D	128
$ \delta $	0.97
Learning rate	1×10^–3
Batch size	16
Epoch	200

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表 3 不同网络模型及损失函数下的建筑物提取性能比较(单位：%)

Table 3. Performance comparison of the building segmentation based on different methods (Unit: %)

网络模型	损失函数	IoU	Dice	Precision	Recall
U-Net^[15]	Focal+Dice	34.98[1.48]	51.81[1.61]	62.30[1.50]	44.42[2.38]
DeepLabV3+[ResNet34]	Focal+Dice	48.40[0.14]	65.23[0.13]	76.95[0.37]	56.61[0.03]
DeepLabV3+[ResNet34]	Focal+Dice+CL	49.81[0.31]	66.50[0.28]	78.32[0.48]	57.78[0.68]
DeepLabV3+[ResNet50] DeepLabV3+[ResNet50]	Focal+Dice Focal+Dice+CL	48.72[0.48] 50.15[0.62]	65.51[0.43] 66.79[0.54]	76.55[0.31] 78.30[0.48]	57.26[0.49] 58.25[0.87]
U-Net[ResNet34]	Focal+Dice	49.09[0.12]	65.85[0.11]	77.36[0.13]	57.33[0.20]
U-Net[ResNet34]	Focal+Dice+CL	50.62[0.58]	67.21[0.52]	76.32[0.25]	60.05[0.97]
U-Net[ResNet50]	Focal+Dice	49.24[0.30]	65.99[0.27]	77.37[0.23]	57.53[0.34]
U-Net[ResNet50]	Focal+Dice+CL	50.99[1.18]	67.53[1.03]	78.21[1.32]	59.50[2.36]

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