A container scanning system comprising: - a camera/sensor unit (211, 221; 311, 321, 331; 411; 500) movably mounted on a container handling crane, said camera/sensor unit (211, 221; 311, 321, 331; 411; 500) comprising a camera and/or a sensor for scanning the exterior surface of a container; and - a control unit operationally coupled to said camera/sensor unit (211, 221; 311, 321, 331; 411; 500), said control unit being able to obtain position information indicative for the operational position of said container handling crane, and said control unit being adapted to control movement of said camera/sensor unit (211, 221; 311, 321, 331; 411; 500) in function of said position information, CHARACTERIZED IN THAT - said container scanning system comprises a rail (201, 202; 301, 302, 303; 401; 510) mounted on a support or beam of said container handling crane, said rail (201, 202; 301, 302, 303; 401; 510) containing space for wiring; - said camera/sensor unit (211, 221; 311, 321, 331; 411; 500) is movably mounted along said rail (201, 202; 301, 302, 303; 401; 510); and - said container scanning system further comprises power lines in said space for wiring for power feeding said camera/sensor unit, wherein: - said rail (301, 302; 401; 510) is mounted substantially vertically-on a sea-side support (105, 106) or land-side support (107, 108) of said container handling crane; - said operational position is an operational height of said container handling crane; and - said camera/sensor unit (311, 321; 411; 500) is moved along said rail (301, 302; 401; 510) to said operational height where said camera and/or said sensor is able-to scan the exterior surface of said container while said container is moved across said vertical sea-side support (105, 106) or land-side support (107, 108) by said container handling crane, and/or wherein: - said rail is mounted substantially horizontally on a portal beam (103, 104) of said container handling crane; - said operational position is a distance from the quay border or a lane wherein said container is loaded or unloaded by said container handling crane; and - said camera/sensor unit is moved along said rail to a position where it is able to scan the exterior surface of a front-side or rear-side of said container while said container is moved vertically across said portal beam (103, 104) by said container handling crane. - a camera/sensor unit (211, 221; 311, 321, 331; 411; 500) movably mounted on a container handling crane, said camera/sensor unit (211, 221; 311, 321, 331; 411; 500) comprising a camera and/or a sensor for scanning the exterior surface of a container; and - a control unit operationally coupled to said camera/sensor unit (211, 221; 311, 321, 331; 411; 500), said control unit being able to obtain position information indicative for the operational position of said container handling crane, and said control unit being adapted to control movement of said camera/sensor unit (211, 221; 311, 321, 331; 411; 500) in function of said position information, CHARACTERIZED IN THAT - said container scanning system comprises a rail (201, 202; 301, 302, 303; 401; 510) mounted on a support or beam of said container handling crane, said rail (201, 202; 301, 302, 303; 401; 510) containing space for wiring; - said camera/sensor unit (211, 221; 311, 321, 331; 411; 500) is movably mounted along said rail (201, 202; 301, 302, 303; 401; 510); and - said container scanning system further comprises power lines in said space for wiring for power feeding said camera/sensor unit, wherein: - said rail (301, 302; 401; 510) is mounted substantially vertically-on a sea-side support (105, 106) or land-side support (107, 108) of said container handling crane; - said operational position is an operational height of said container handling crane; and - said camera/sensor unit (311, 321; 411; 500) is moved along said rail (301, 302; 401; 510) to said operational height where said camera and/or said sensor is able-to scan the exterior surface of said container while said container is moved across said vertical sea-side support (105, 106) or land-side support (107, 108) by said container handling crane, and/or wherein: - said rail is mounted substantially horizontally on a portal beam (103, 104) of said container handling crane; - said operational position is a distance from the quay border or a lane wherein said container is loaded or unloaded by said container handling crane; and - said camera/sensor unit is moved along said rail to a position where it is able to scan the exterior surface of a front-side or rear-side of said container while said container is moved vertically across said portal beam (103, 104) by said container handling crane.