The use of a camera in a robot control loop can be performed with two types of architecture: the camera is said eye-in-hand when rigidly mounted on the robot end-effector and it is said eyeto-hand when it observes the robot within its work space. These two schemes have technical differences and they can play very complementary parts. Obviously, the eye-in-hand one has a partial but precise sight of the scene whereas the eye-to-hand camera has a less precise but global sight of it. The

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... of our work is to take advantage of both, free-standing and robotmounted sensors, in a cooperation scheme. The system we present in this paper performs two separate tasks: a positioning one that is ensured in the global image and a tracking one performed in the local image. For robustness considerations, the control law stability is proved and several cooperative schemes are studied and compared in experimental results.