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基于小波特征和邻域信息的无人机高光谱影像农作物精细分类方法

Crop fine classification method with UAV hyperspectral images based on wavelet features and neighborhood information

  • 摘要: 农业是保障国家经济稳定和社会发展的基础产业,利用无人机高光谱影像进行精确的作物分类与制图,对农业生产管理和政策制定至关重要。依据无人机高光谱影像同时具有高光谱分辨率和高空间分辨率的特点,提出一种基于小波特征和邻域信息的无人机高光谱影像农作物精细分类方法。该方法首先通过多级小波分解提取高光谱信号的趋势与细节特征,利用训练样本自我验证筛选出最优特征组合并优化分类器参数;随后引入邻域分析扩展地物的特征信息,增强作物空间差异较明显区域的样本代表性并获得最优小波特征集进行最终分类。试验结果表明,相比于常规原始光谱特征分类,采用小波变换特征分类精度由73.90%提升至83.68%,增幅达9.78个百分点,结合邻域信息分类精度进一步提升至86.29%。该方法有效提升农作物分类精度,并有效减少农作物分类过程中由于光谱特征相似和受作物长势不同、土壤裸露等空间差异因素所带来的干扰,验证了小波变换与邻域分析相结合在高光谱影像分类中的有效性。

     

    Abstract: Agriculture is a foundational industry that ensures national economy stability and social development.Using of UAV hyperspectral images for precise crop classification and mapping is crucial for agricultural production management and policy-making.According to characteristics of UAV hyperspectral images with both high spectral resolution and high spatial resolution, a crop fine classification method based on wavelet features and neighborhood information was proposed.Firstly, trend and detail features of hyperspectral signals were extracted by multi-level wavelet decomposition, training samples were used to self-validation to filter out optimal feature combination and optimize classifier parameters.Subsequently, neighborhood analysis was introduced to extend feature information of surface features, enhance samples representativeness in areas with significant spatial differences in crops, and obtain optimal wavelet feature set for final classification.Experimental results showed that, compared with conventional original spectral feature classification, classification accuracy using wavelet feature transform increased from 73.90% to 83.68%, an improvement of 9.78 percentage point, combining neighborhood information further increased classification accuracy to 86.29%.This method effectively improved accuracy of crop classification and significantly reduced interference caused by spatial differences such as spectral feature similarities, variations in crop growth, and soil exposure during crop classification process.Effectiveness of wavelet transform combined with neighborhood analysis in hyperspectral image classification was verified.

     

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