a system for automatically acquiring high - resolution images by steering a pan - tilt - zoom camera at targets detected in a fixed camera view is provided . the system uses automatic or manual calibration between multiple cameras . using automatic calibration , the homography between the cameras in a home position is estimated together with the effects of pan and tilt controls and the expected height of a person in the image . these calibrations are chained together to steer a slave camera . the manual calibration scheme steers a camera to the desired region of interest and calculates the pan , tile and zoom parameters accordingly .