College of Computer Science and Information Technology Central South University of Forestry and Technology Changsha 410004 China;
College of Computer Science and Information Technology Central South University of Forestry and Technology Changsha 410004 China;
College of Computer Science and Electronic Engineering Hunan University Changsha 410082 China;
College of Computer Science and Information Technology Central South University of Forestry and Technology Changsha 410004 China;
College of Computer Science and Information Technology Central South University of Forestry and Technology Changsha 410004 China;
College of Computer Science and Information Technology Central South University of Forestry and Technology Changsha 410004 China;
Image augmentation; small-scale dataset; deep feature; deep learning; convolutional neural network;