The use of multi-camera systems in target tracking applications demands to know positions and orientations of each one
of the cameras in a global coordinate system. In this work is described the development and implementation of an extrinsic calibration
method for multi-camera systems. A theoretical analysis of each stage of the processisshown, pointing out methods and tools. Furthermore,
a new calibration pattern is proposed. The validation is performed with simple experiments and in a real deployment of IP cameras
