基于近红外光谱技术结合改进的CS-BPNN樱桃番茄SSC和Vc含量检测

为实现精确预测樱桃番茄中SSC和Vc含量，该研究提出一种改进杜鹃鸟搜索算法优化的BP神经网络(Back Propagation Neural Network Optimized by Improved Cuckoo Search Algorithm,ICS-BPNN)模型。采集样品在1 350～1 800 nm的近红外光谱数据，首先采用不同方法进行预处理；然后利用稳定性竞争性自适应重加权算法(Stability Competitive Adaptive Reweighting Algorithm,SCARS)、遗传算法(Genetic Algorithm,GA)和自动有序预测因子选择算法(Automatic Ordinal Predictor Selection Algorithm,Auto OPS)3种方法进行特征波长提取；最后结合机器学习方法建立了BP神经网络(Back Propagation Neural Network,BPNN)和基于杜鹃鸟搜索的BP神经网络模型(Back Propagation Neural Network Optimized by Cuckoo Searc...

Soluble Solids Content and Vitamin C Detection in Cherry Tomatoes Based on Near Infrared Spectroscopy Combined with Improved CS-BPNN

To accurately predict soluble solids and vitamin C content in cherry tomatoes, a backpropagation neural network model optimized using the improved cuckoo search algorithm (ICS-BPNN) is proposed. The near-infrared spectra of the samples at 1 350~1 800 nm were collected and pre-processed using different methods. The stability competitive adaptive reweighted sampling (SCARS), genetic (GA), and automatic ordinal predictor selection (Auto OPS) algorithms were then employed to extract the characteristic wavelength. BPNN and CS-BPNN models were established using machine learning methods. To further enhance accuracy and convergence of the models, an adaptive algorithm was introduced to improve the probability of cuckoo egg elimination, and the cross-border nests were newly processed via ICS-BPNN. The optimized models demonstrated ideal results. The results showed that the coefficients of determination, R2c and R2p of the soluble solid content were 0.83 and 0.85, respectively; the root mean square error of calibration (RMSEC) and prediction (RMSEP) sets were 0.85 and 0.79, respectively. The vitamin C content obtained using the optimized model had R2c and R2p of 0.91 and 0.91, respectively. The RMSEC and RMSEP values were 0.48 and 0.45, respectively. Thus, a combination of near-infrared spectroscopy and improved machine learning methods can achieve the rapid and non-destructive predictive analysis of the internal quality of cherry tomatoes.