Intelligent Identification Method of Crop Species Using Improved U-Net Network in UAV Remote Sensing Image

Aiming at the problems of incomplete classification features extraction of remote sensing images and low accuracy of crop classification in existing crop classification and recognition methods, a crop classification and recognition method using improved U-Net in Unmanned Aerial Vehicle (UAV) remote sensing images is proposed. First, the experimental data set is preprocessed. The data set is expanded by flipping transformation, translation transformation, and random cutting, which expands the number of data sets, and then the original image is cut to meet the requirements of the experiment for image size; Moreover, the network structure of U-Net is deepened, and the atrous spatial pyramid pooling (ASPP) structure is introduced after the encoder to better understand the semantic information and improve the ability of model mining data features; Finally, in order to prevent the overfitting of the deepened model, the dropout layer is introduced to weaken the joint adaptability between various neurons. Experiments show that the comprehensive OA and Kappa indexes of the proposed crop classification and recognition method based on improved U-Net are 92.14% and 0.896, respectively, which are better than the comparison methods. Therefore, the proposed method has good ability of crop classification and recognition.