This paper describes the concept of an autonomous robot for harvesting cucumbers in greenhouses. A
description is given of the working environment of the robot and the logistics of harvesting. It is stated that for a
2 ha Dutch nursery, 4 harvesting robots and one docking station are needed during the peak season. Based on these
preliminaries, the design specifications of the harvest robot are defined. The main requirement is that a single harvest
operation may take at most 10 s. Then, the paper focuses on the individual hardware and software components of the
robot. These include, the autonomous vehicle, the manipulator, the end-effector, the two computer vision systems
for detection and 3D imaging of the fruit and the environment and, finally, a control scheme that generates collisionfree
motions for the manipulator during harvesting. The manipulator has seven degrees-of-freedom (DOF). This is
sufficient for the harvesting task. The end-effector is designed such that it handles the soft fruit without loss of quality.
The thermal cutting device included in the end-effector prevents the spreading of viruses through the greenhouse.
The computer vision system is able to detect more than 95% of the cucumbers in a greenhouse. Using geometric
models the ripeness of the cucumbers is determined. A motion planner based on the A∗-search algorithm assures
collision-free eye-hand co-ordination. In autumn 2001 system integration took place and the harvesting robot was
tested in a greenhouse. With a success rate of 80%, field tests confirmed the ability of the robot to pick cucumbers
without human interference. On average the robot needed 45 s to pick one cucumber. Future research focuses on
hardware and software solutions to improve the picking speed and accuracy of the eye-hand co-ordination of the
robot