Marine oil spills are among the most significant sources of marine pollution. Synthetic aperture radar (SAR) has been used to improve oil spill observations because of its advantages in oil spill detection and identification. However, speckle noise, weak boundaries, and intensity inhomogeneity often exist in the oil spill regions of SAR imagery, which will seriously affect the accurate identification of oil spills. To enhance marine oil spill segmentation of SAR images, a fast, edge-preserving framework based on the distance-regularized level set evolution (DRLSE) model was proposed. Specifically, a bilateral filter penalty term is designed and incorporated into the DRLSE energy function (BF-DRLSE) to preserve the edges of oil spills, and an adaptive initial box boundary was selected for the DRLSE model to reduce the operation time complexity. Two sets of RadarSat-2 SAR data were used to test the proposed method. The experimental results indicate that the bilateral filtering scheme incorporated into the energy function during level set evolution improved the stability of level set evolution. Compared with other methods, the proposed improved BF-DRLSE algorithm displayed a higher overall segmentation accuracy (97.83%). In addition, using an appropriate initial box boundary for the DRLSE method accelerated the global search process, improved the accuracy of oil spill segmentation, and reduced computational time. Therefore, the results suggest that the proposed framework is effective and applicable for marine oil spill segmentation.
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The authors thank the reviewers and editors for their professional and diligent works.
Supported by the National Key R&D Program (No. 2017YFC1405600), the National Natural Science Foundation of China (Nos. 41776182, 42076182), and the Natural Science Foundation of Shandong Province (No. ZR2016DM16)
Data Availability Statement
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Wang, W., Sheng, H., Chen, Y. et al. A fast, edge-preserving, distance-regularized model with bilateral filtering for oil spill segmentation of SAR images. J. Ocean. Limnol. (2021). https://doi.org/10.1007/s00343-020-0105-7
- level sets
- bilateral filter
- marine oil spill segmentation
- synthetic aperture radar (SAR) imagery