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Research on state prediction method of tobacco curing process based on model fusion

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Abstract

China’s tobacco plantation industry includes a large scale and numerous employees. Nevertheless, the current tobacco curing control technology has higher labor intensity, however, it also cannot be adjusted based on the conditions of different tobacco leaves batches reducing the quality of tobacco. The tobacco’s quality can be improved after curing and labor intensity can be reduced by modeling the state prediction of the tobacco curing process, accurately predicting the state of the tobacco curing, and making timely adjustments to the curing process. The area, color, weight, and some chemical substances of tobacco leaves significantly change during the tobacco curing process. This can be theoretically used as the input feature of the state prediction model. However, it is difficult to calculate the changes of the area and the changes of chemical substances in real-time owing to the complexity of the intensive curing room environment. Only features such as color and weight are easier to extract indicating that the model has fewer available features, and the accuracy of prediction using a single model is relatively low. Considering this problem, a state prediction fusion model (SPFM) was proposed integrating Long-Short Term Memory (LSTM) and Extreme Gradient Boosting (XGBoost). At the same time, based on the characteristics of the data set, a new data processing is proposed for the tobacco curing data set. By denoising, the image, the characteristic values of the RGB (Red, Green, Blue), HSV (Hue, Saturation, Value) color space were extracted. Then, the data pre-processing such as standardization, data cleaning, and label digitization were performed on the data. Furthermore, an intelligent tobacco curing platform was designed to integrate data collection, online monitoring, data mining, and status prediction, and SPFM was embedded in the platform. A comparative test was conducted, based on the real data collected via a tobacco station in 2019. The results indicate that SPFM has a better performance compared to support vector machines, artificial neural network, and the base models of SPFM such as XGBoost and LSTM. The accuracy of SPFM is 0.974, with an increase of 4.8–59.7%; the macro recall of SPFM is 0.952, with an increase of 8.2%–49.9%; the macro recall of SPFM is 0.936, with an increase of 8.2–75.0%; and the macro F1-score of SPFM is 0.943, with an increase of 9.7–108.6%.

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Authors and Affiliations

  1. School of Automation, China University of Geosciences, Wuhan, China

    Yichao Wang

  2. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, China

    Lang Qin

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  1. Yichao Wang
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  2. Lang Qin
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Correspondence to Yichao Wang.

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Wang, Y., Qin, L. Research on state prediction method of tobacco curing process based on model fusion. J Ambient Intell Human Comput 13, 2951–2961 (2022). https://doi.org/10.1007/s12652-021-03129-5

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