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Automation of agricultural work has been expected to solve several problems of Japan's agriculture and help farmers. Now it is becoming a key to keep sustainability of national agricultural production. Thus we are now trying to develop a robot combine harvester. Attempts have been made to develop robot combine harvester. Although a few prototypes can run and automatically harvest rice and wheat, unloading work, in which grains are unloaded through harvester's auger into a grain container on a truck, has not yet been automated. In this paper, a method using machine vision is presented to position the harvester's spout at an appropriate point. Experimental results show that this method has sufficient accuracy.