1. College of Information Engineering, Guangdong Eco-Engineering Polytechnic, Guangzhou 510520, China
2. Foshan-Zhongke Innovation Research Institute of Intelligent Agriculture and Robotics, Foshan 528231, China
3. College of Electronic Engineering, South China Agricultural University, Guangzhou 510642, China
4. Guangdong Academy of Forestry Sciences, Guangzhou 510520, China
5. Zhujiang College, South China Agricultural University, Guangzhou 510642, China