Patent ID: 7965935

Claim:
A control device connected to a camera unit, the control device comprising: a storage control unit configured to cause a storage unit to store a plurality of images having a plurality of zooming positions shot by the camera unit at one of a plurality of shooting positions of the camera unit, and information of the one shooting position of the camera unit, in association with each other; a comparison unit configured to compare one image, in one of the plurality of zooming positions, newly shot by the camera unit at the one shooting position with one of the stored images with the one zooming position, with respect to optical information, and compare another image, in another one of the plurality of zooming positions, newly shot by the camera unit at the one shooting position with another one of the stored images with the another one zooming position, with respect to optical information, to detect a degree of a displacement of the camera unit with respect to the one shooting position; and a correction unit configured to compensate the displacement of the camera unit with respect to the shooting position if the displacement is detected, wherein said correction unit selects the another one stored image in the another one zooming position according to the degree of the displacement of the camera unit with respect to the one shooting position.