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    改进的残差式3D-CNN和近邻注意力的高光谱遥感图像分类

    Hyperspectral remote sensing image classification using improved residual 3D-CNN and neighborhood attention

    • 摘要: 在引起广泛关注的高光谱遥感图像分类中,同物异谱、同谱异物和少样本都大大限制了分类方法的性能。为了充分挖掘高光谱图像的空间-光谱特征,该文提出了一种改进的残差卷积和近邻注意力网络用于高光谱遥感图像分类。该方法包含3个部分:结合了残差连接和3D卷积神经网络(3D convolutional neural network,3D-CNN)的残差式光谱特征提取模块、使用混合卷积的空间-光谱特征融合模块、用于增强模型对同质区域的关注能力的近邻注意力模块。在3个公开的高光谱数据集Indian pines,Pavia University,Houston2013上的实验结果显示,相比近期先进高光谱分类方法,所提方法有更高的分类精度,且在使用10%以下训练样本的前提下总体精度可分别达到99.39%,99.67%和98.64%,实现了少样本下的高精度分类。

       

      Abstract: Hyperspectral remote sensing image classification has attracted widespread attention,yet the performance of classification methods remains greatly limited by challenges such as spectral variability (same object with different spectra),spectral confusion (different objects with similar spectra),and limited availability of training samples. To fully exploit the spatial-spectral features of hyperspectral images,this study proposed an improved network integrating residual convolution and neighborhood attention mechanisms. The proposed method consists of:(1) a residual-based spectral feature extraction module combining residual connections and a 3D convolutional neural network (3D-CNN);(2) a spatial-spectral feature fusion module using mixed convolutions;and (3) a neighborhood attention module designed to enhance the model's ability to focus on homogeneous regions. Experiments were conducted on three public hyperspectral datasets-Indian Pines,Pavia University,and Houston 2013. The results demonstrate that the proposed method achieves higher classification accuracy compared to recent state-of-the-art approaches. Using less than 10% of the samples for training,it attains overall accuracies of 99.39%,99.67%,and 98.64%,respectively,confirming its capability for high-accuracy classification under small-sample conditions.

       

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