1. A method of controlling the movement of a virtual camera whose image plane provides a cut-out from a captured image of a scene, the method comprising: defining a set of first pixel positions forming the boundary of the cut-out of the captured image; defining a set of second pixel positions for the boundary of the captured image; calculating a virtual camera rotation matrix to be applied to the first pixel positions, the virtual camera rotation matrix representative of the difference in at least one of the yaw and pitch of the image plane of the virtual camera and the image plane of the captured image of the scene, wherein the virtual camera rotation matrix is limited such that when one of the set of first pixel positions is transformed using the virtual camera rotation matrix, the transformed first pixel position is located within the boundary of the captured image.