PTZ (Pan/Tilt/Zoom）cameras have been widely used in visual surveillance domain because of its capability of changing both view angle and image resolution.Dual PTZ camera system is one of the simplest systems that multi resolution information and stereo information can be obtained synchronously.Although there are few related researches about dual PTZ camera system in the state of the art

we believe it has wide aspplication prospects.Building the common coordinate system is an important problem in dual PTZ camera calibration

which can be used for image alignment and stereo matching.From this point

we adopt the longitude latitude coordinate system and use a multi fundamental matrix approach to deal with the calibration problem.Traditional multi camera calibration approaches mainly deal with the static cameras

and which always take advantage of the known camera locations or use calibration tools.The proposed calibration is independent to specific PTZ parameters

which is very convenient in application.The experimental results show the practicality of our approach.