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Hierarchical coastline detection in SAR images based on spectral-textural features and global–local information

Hierarchical coastline detection in SAR images based on spectral-textural features and global–local information

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© The Institution of Engineering and Technology
Received 06/02/2019, Accepted 16/08/2019, Revised 15/07/2019, Published 21/08/2019

This study presents a novel approach to detect the coastline from single-polarisation synthetic aperture radar (SAR) images. The proposed method encompasses land/sea segmentation, coastline detection, and refinement. A novel spectral–textural segmentation framework (STSF) is proposed by using the spectral–textural features extracted from the input image patches. The STSF distinguishes various coastal/sea types and is robust to noise. Also, a hierarchical region-based level set method (LSM) is proposed to detect the coastline, accurately. The first LSM step applies global information for evolution. The LSM initialisation is performed using the obtained rough segmentation, which is very practical as the final LSM evolution depends on the initial value, particularly on complex SAR images. The global region-based LSM (GRB-LSM) step modifies the previous segmentation and approaches to the coastline. To improve accuracy, a local region-based LSM (LRB-LSM) is proposed. Therefore, in the second LSM step, the LRB-LSM applies to the results of GRB-LSM step. The LRB-LSM improves the accuracy of the detected coastline while ensuring its smoothness. To verify the performance of the proposed method, several high-resolution SAR images from different microwave bands and various coastal environments are used. The performance of the proposed method is confirmed by the given experiments.

Inspec keywords: geophysical image processing; image segmentation; feature extraction; synthetic aperture radar; radar imaging; image texture

Other keywords: rough segmentation; global region-based LSM step; LRB-LSM; input image patches; global–local information; local region-based LSM; GRB-LSM step; novel spectral–textural segmentation framework; hierarchical region-based level set method; final LSM evolution; hierarchical coastline detection; previous segmentation; complex SAR images; STSF; detected coastline; spectral–textural features; LSM initialisation; high-resolution SAR images; global information; single-polarisation synthetic aperture radar images

Subjects: Optical, image and video signal processing; Radar equipment, systems and applications; Computer vision and image processing techniques; Other topics in statistics; Instrumentation and techniques for geophysical, hydrospheric and lower atmosphere research

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