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Open AccessArticle

Water Areas Segmentation from Remote Sensing Images Using a Separable Residual SegNet Network

by Liguo Weng 1,2,*, Yiming Xu 1, Min Xia 1,2,*, Yonghong Zhang 1, Jia Liu 1 and Yiqing Xu 3
1
Collaborative Innovation Center on Atmospheric Environment and Equipment Technology, Nanjing University of Information Science and Technology, Nanjing 210044, China
2
College of Information Science and Technology, Nanjing Forestry University, Nanjing 210037, China
3
Jiangsu Key Laboratory of Big Data Analysis Technology, Nanjing University of Information Science and Technology, Nanjing 210044, China
*
Authors to whom correspondence should be addressed.
ISPRS Int. J. Geo-Inf. 2020, 9(4), 256; https://doi.org/10.3390/ijgi9040256
Received: 21 February 2020 / Revised: 4 April 2020 / Accepted: 15 April 2020 / Published: 18 April 2020
(This article belongs to the Special Issue Geospatial Artificial Intelligence)
Changes on lakes and rivers are of great significance for the study of global climate change. Accurate segmentation of lakes and rivers is critical to the study of their changes. However, traditional water area segmentation methods almost all share the following deficiencies: high computational requirements, poor generalization performance, and low extraction accuracy. In recent years, semantic segmentation algorithms based on deep learning have been emerging. Addressing problems associated to a very large number of parameters, low accuracy, and network degradation during training process, this paper proposes a separable residual SegNet (SR-SegNet) to perform the water area segmentation using remote sensing images. On the one hand, without compromising the ability of feature extraction, the problem of network degradation is alleviated by adding modified residual blocks into the encoder, the number of parameters is limited by introducing depthwise separable convolutions, and the ability of feature extraction is improved by using dilated convolutions to expand the receptive field. On the other hand, SR-SegNet removes the convolution layers with relatively more convolution kernels in the encoding stage, and uses the cascading method to fuse the low-level and high-level features of the image. As a result, the whole network can obtain more spatial information. Experimental results show that the proposed method exhibits significant improvements over several traditional methods, including FCN, DeconvNet, and SegNet. View Full-Text
Keywords: semantic segmentation; water area segmentation; encoder-decoder; depthwise separable convolution; residual network semantic segmentation; water area segmentation; encoder-decoder; depthwise separable convolution; residual network
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Weng, L.; Xu, Y.; Xia, M.; Zhang, Y.; Liu, J.; Xu, Y. Water Areas Segmentation from Remote Sensing Images Using a Separable Residual SegNet Network. ISPRS Int. J. Geo-Inf. 2020, 9, 256.

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