Semantic-aware DropSplat: Adaptive Pruning of Redundant Gaussians for 3D Aerial-View Segmentation

• URL: http://arxiv.org/abs/2508.09626v2
• Date: Thu, 14 Aug 2025 08:26:32 GMT
• Title: Semantic-aware DropSplat: Adaptive Pruning of Redundant Gaussians for 3D Aerial-View Segmentation
• Authors: Xu Tang, Junan Jia, Yijing Wang, Jingjing Ma, Xiangrong Zhang,
• Abstract summary: We propose a novel 3D-AVS-SS approach named SAD-Splat to address semantic ambiguity in aerial images.<n>Our method integrates semantic confidence estimation with a learnable sparsity mechanism based on the Hard Concrete distribution.<n>It achieves an excellent balance between segmentation accuracy and representation compactness.
• Score: 15.196083762043004
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In the task of 3D Aerial-view Scene Semantic Segmentation (3D-AVS-SS), traditional methods struggle to address semantic ambiguity caused by scale variations and structural occlusions in aerial images. This limits their segmentation accuracy and consistency. To tackle these challenges, we propose a novel 3D-AVS-SS approach named SAD-Splat. Our method introduces a Gaussian point drop module, which integrates semantic confidence estimation with a learnable sparsity mechanism based on the Hard Concrete distribution. This module effectively eliminates redundant and semantically ambiguous Gaussian points, enhancing both segmentation performance and representation compactness. Furthermore, SAD-Splat incorporates a high-confidence pseudo-label generation pipeline. It leverages 2D foundation models to enhance supervision when ground-truth labels are limited, thereby further improving segmentation accuracy. To advance research in this domain, we introduce a challenging benchmark dataset: 3D Aerial Semantic (3D-AS), which encompasses diverse real-world aerial scenes with sparse annotations. Experimental results demonstrate that SAD-Splat achieves an excellent balance between segmentation accuracy and representation compactness. It offers an efficient and scalable solution for 3D aerial scene understanding.

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