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    基于MAML算法的高分五号高光谱图像小样本植被分类

    MAML algorithm-based few-shot vegetation classification for GF-5 hyperspectral images

    • 摘要: 传统深度学习算法要求输入大量的样本标签,但遥感高质量样本的获取难度和成本均较大,限制了算法的性能和应用效果。对此,该文提出了一种基于模型无关元学习(model-agnostic meta-learning,MAML)算法的高光谱图像植被分类方法,该方法旨在样本数量稀缺的情况下,利用少量样本实现高效分类。基于2023年4月7日潍坊地区的高分五号高光谱遥感图像,使用MAML框架基于光谱特征和空间-光谱特征构建了2种元学习模型进行植被分类实验。实验结果表明,采用空间-光谱模型在每类仅设置20个样本的条件下,整体精度达到84%,单一类别的最高精度为89%; 相比不使用MAML框架的分类方法,整体精度和各植被类型的分类精度均有显著提高,验证了在小样本条件下该方法的有效性和准确性。

       

      Abstract: Conventional deep learning-based algorithms require substantial annotated samples as input. However, high-quality remote sensing image samples are constrained by acquisition challenges and high cost, limiting both performance and application effectiveness of these algorithms. Given the heavy reliance of conventional algorithms on substantial annotated samples, this paper proposed a vegetation classification method for hyperspectral images based on the model-agnostic meta-learning (MAML) algorithm. This method aims to achieve efficient classification using a small number of samples under conditions of sample scarcity. Based on the GF-5 hyperspectral remote sensing images of the Weifang region captured on April 7, 2023, this study constructed two meta-learning models within the MAML framework using spectral features and spatial-spectral features, respectively. Subsequently, it conducted vegetation classification experiments using the two models. Experimental results show that, with only 20 samples per class, the spatial-spectral model achieved an overall accuracy of 84%, with a maximum single-class accuracy of 89%. Compared with conventional classification methods, the MAML-based method presented significant enhancements in overall accuracy and the classification accuracy across all vegetation types. This verified the effectiveness and accuracy of this method under few-shot conditions.

       

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