Author

Hayat Rajani

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Preprint Aug 2026

Weakly Supervised Seafloor Segmentation for Seagrass Habitat Mapping in Side-Scan Sonar Imagery

Seagrass meadows are crucial blue-carbon habitats, and mapping their extent is a prerequisite for coastal management and carbon inventory. Optical satellite sensors cover large areas but cannot reach deep or turbid water, whereas side-scan sonar (SSS) images the seabed at high resolution and at any depth. Interpreting...

Hayat Rajani, Nuno Gracias, Rafael Garcia · 0 citations

Preprint Aug 2026

BenthicDINO: Physics-Informed Self-Distillation for View-Invariant Side-Scan Sonar Representations

Automated perception in side-scan sonar (SSS) imagery is severely hindered by physical acoustic artifacts, resulting in representations that inextricably mix intrinsic seabed reflectivity with transient viewing geometries. Existing self-supervised learning (SSL) frameworks rely on augmentations designed for natural ima...

Taqi Hamoda, Hayat Rajani, Nuno Gracias · 0 citations

Open access Nov 2025

Coarse-to-Fine Nonrigid Registration for Side-Scan Sonar Mosaicking

Side-scan sonar (SSS) mosaicking plays a crucial role in large-scale seabed mapping but is challenged by complex nonlinear, spatially varying distortions due to diverse sonar acquisition conditions. Existing rigid or affine registration methods fail to model such complex deformations, whereas traditional nonrigid techn...

Can Lei, Nuno Gracias, Rafael Garcia et al. · IEEE Transactions on Geoscie... · 0 citations