arXiv:2412.11535cs.CV2024-12被引 9

根据无人机飞行高度自适应调整图像分区,提升跨视角定位精度

Scale-adaptive UAV Geo-localization via Height-aware Partition Learning

  • 利用飞行高度预测尺度因子,动态调整图像分区大小
  • 在多个尺度不一致场景下达到当前最优定位准确率
  • 适合无人机地理定位、遥感图像匹配等实际应用

无人机地理定位因航拍图像与卫星视图间显著外观差异面临挑战。现有方法通常假设视图间尺度一致,并依赖预定义分区对齐,通过局部特征构建实现视角不变表示。然而在真实场景中,无人机飞行状态变化导致跨视图尺度不匹配,严重影响性能。为此,我们提出一种基于高度感知的自适应分区学习框架,利用已知飞行高度预测尺度因子并动态调整特征提取。核心贡献是高度感知调整策略,计算航拍与卫星视图的相对高度比,动态调节分区尺寸,显式对齐分区对间的语义信息。该策略集成于尺度自适应局部分区网络(SaLPN),在原有方形分区基础上提取细粒度与全局特征。此外,提出显著性引导优化策略,进一步提升检索准确率。大量实验验证,所提方法在多种尺度不一致场景下实现当前最优定位精度,且对尺度变化具有强鲁棒性。代码将公开。

原文摘要 · Abstract (English)

UAV Geo-Localization faces significant challenges due to the drastic appearance discrepancy between dronecaptured images and satellite views. Existing methods typically assume a consistent scaling factor across views and rely on predefined partition alignment to extract viewpoint-invariant representations through part-level feature construction. However, this scaling assumption often fails in real-world scenarios, where variations in drone flight states lead to scale mismatches between cross-view images, resulting in severe performance degradation. To address this issue, we propose a scale-adaptive partition learning framework that leverages known drone flight height to predict scale factors and dynamically adjust feature extraction. Our key contribution is a height-aware adjustment strategy, which calculates the relative height ratio between drone and satellite views, dynamically adjusting partition sizes to explicitly align semantic information between partition pairs. This strategy is integrated into a Scale-adaptive Local Partition Network (SaLPN), building upon an existing square partition strategy to extract both finegrained and global features. Additionally, we propose a saliencyguided refinement strategy to enhance part-level features, further improving retrieval accuracy. Extensive experiments validate that our height-aware, scale-adaptive approach achieves stateof-the-art geo-localization accuracy in various scale-inconsistent scenarios and exhibits strong robustness against scale variations. The code will be made publicly available.

无人机定位跨视角匹配自适应分区几何定位

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