• 基于差异增强与边缘感知的耕地变化检测方法研究

    Research on cropland change detection method based on difference-guided and edge-aware mechanisms

    • 遥感变化检测技术旨在观察和分析同一地区在不同时间段内的遥感影像,以确定该地区发生变化的位置、类型和范围。针对现有耕地变化检测方法中存在变化耕地与背景之间边缘模糊,且变化耕地间边界黏连的问题,提出了一种基于差异增强和边缘感知的耕地变化检测网络(DGEANet)。DGEANet使用孪生ResNet网络从双时相遥感图像中提取多尺度、多层次特征;设计的差异注意力增强模块,接受不同尺度的双时相特征,增强不同时相特征图差异性和关联性;模型在各尺度下引入边缘感知模块和边缘引导模块识别变化地块边界,增强模型感知变化能力的同时强化变化边缘的完整性;此外,设计了并行注意力融合模块,通过对特征图进行并行空间-通道注意力计算和像素级别的细节恢复,实现对不同大小变化地块的有效提取。同时,使用边缘感知图计算辅助损失,通过给变化地块边缘进行深层监督,来改善网络训练,同时增强模型对变化地块提取的完整性。在耕地变化检测数据集CLCD和PX-CLCD上进行了定性与定量实验分析,证明了所提方法的有效性与良好的的变化检测精度。

       

      Abstract: Remote sensing change detection technology aims to observe and analyze remote sensing images of the same area at different times to determine the locations, types, and extent of changes. Addressing the issues of blurred edges between changed cropland and background and boundary adhesion between changed cropland in existing methods, a cropland change detection network based on difference enhancement and edge awareness (DGEANet) is proposed. DGEANet uses a Siamese ResNet to extract multi-scale, multi-level features from bi-temporal remote sensing images. The proposed Cross Attention Difference Enhancement module receives multi-scale bi-temporal features, enhancing the difference and correlation between temporal features. Edge-aware module and edge-guided module are introduced at each scale to identify cropland boundaries, improving change detection accuracy while enhancing edge integrity of the changed areas. Additionally, a parallel attention fusion module calculates spatial-channel attention in parallel and performs pixel-level detail recovery, enabling effective extraction of changed cropland of varying sizes. Auxiliary edge-aware loss is used to apply deep supervision to change boundaries, improving network training and enhancing the integrity of extracted change regions. DGEANet achieves high detection accuracy on standard cropland change detection datasets, CLCD and PX-CLCD, demonstrating the method's effectiveness.

       

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