基于光谱技术的桔子汁品种鉴别方法的研究

为了实现桔子汁不同品种的快速光谱鉴别,首先采用主成分分析法对光谱数据进行聚类分析,从定性分析的角度得到四种不同品种桔子汁的特征差异.同时将小波变换用于对大量光谱数据的压缩,并结合RBF神经网络建立桔子汁品种鉴别的定量分析模型.该模型将小波压缩后的数据作为神经网络的输入向量,建立径向基函数RBF神经网络.4个品种共240个样本用来建立RBF神经网络的训练模型,剩余的60个样本用于预测.预测结果表明,小波变换结合RBF神经网络的桔子汁品种鉴别的准确率达到100%.说明文章提出的基于光谱技术的鉴别方法具有很好的分类能力,它为桔子汁品种的快速鉴别提供了一种新方法.

Research on Discrimination Method of Orange Juice Variety Based on Spectroscopy Technology

In order to quickly analyze varieties of orange juice with near infrared spectra,firstly,principal component analysis(PCA) was used to analysze the clustering of orange juice samples,and the characteristic differentia of four orange juice varieties was obtained through qualitative analysis.Then plentiful spectral data were compressed by wavelet transform(WT) and the model was built with radial basis function neural network(RBF-NN),which offered a quantitative analysis of orange juice varieties discrimination.The model regarded the compressed data as the input of RBF-NN input vectors and built a RBF-NN model.Two hundred forty samples from four varieties were selected randomly to build the training model,which in turn was used to predict the varieties of 60 unknown samples.The discrimination rate of 100% was achieved by WT-RBFNN method.It was indicated that wavelet transform combined with RBF-NN is an available method for variety discrimination based on the near infrared reflectance spectroscopy technology.It offered a new approach to the fast discrimination of varieties of orange juice .