Nitrogen Content Inversion of Corn Leaf Data Based on Deep Neural Network Model

To obtain excellent regression results under the condition of small sample hyperspectral data, a deep neural network with simulated annealing (SA-DNN) is proposed. According to the characteristics of data, the attention mechanism was applied to make the network pay more attention to effective features, thereby improving the operating efficiency. By introducing an improved activation function, the data correlation was reduced based on increasing the operation rate, and the problem of over-fitting was alleviated. By introducing simulated annealing, the network chose the optimal learning rate by itself, which avoided falling into the local optimum to the greatest extent. To evaluate the performance of the SA-DNN, the coefficient of determination (R²), root mean square error (RMSE), and other metrics were used to evaluate the model. The results show that the performance of the SA-DNN is significantly better than other traditional methods.