| 摘要 |
A security system ( 20 ) includes at least one camera ( 22 ) that provides a reference image regarding an area within a field of vision ( 24 ) of the camera ( 22 ). A controller ( 30 ) determines whether a difference between at least a portion of a test image obtained by the camera ( 22 ) and a corresponding portion of the reference image indicates tampering with the camera. Disclosed examples detect a variety of tampering conditions and provide an indication of camera tampering so that corrective or preventative measures may be taken.
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