| 摘要 |
An optical surveillance system for use, e.g. in detecting shoplifting in retail outlets is disclosed, in which a surveillance assembly provided with an optical detector (such as a closed circuit television camera) is mounted on a rail, permitting the optical detector to be selectively positioned, for example to reduce blind spots due to obstacles. The rail may, for example, be ceiling mounted, or may form part of furniture, freezer cabinets, etc. Image signals from the optical detector are carried by at least one electrical conductor along the rail and the system may have provision for transmission of control signals along the rail to the surveillance assembly. |
