Multi-mode system and method for spraying pesticide by unmanned aerial vehicle based on image processing

The invention discloses a multi-mode system for spraying a pesticide by an unmanned aerial vehicle based on image processing. The system comprises a main control module mounted on the unmanned aerialvehicle. The system further comprises a communication module mounted on the unmanned aerial vehicle, which is used for wireless signal transmission between the main control module and a console; a spraying pattern module, which receives an instruction send by the main control module, so as to control positions and doses of pesticide spraying, and control the unmanned aerial vehicle to reciprocate;an image circling and processing module, which is used for performing image circling on crops, calculating growth states of the crops in each circled image and transmitting the growth states to the master control module; a motion pattern module, which receives the instruction send by the main control module to control whether the unmanned aerial vehicle translates in a horizontal direction or not; a position control modul