Nhiều điều khoản và định nghĩa được sử dụng trong ngành công nghiệp bảo mật là duy nhất để giám sát CCTV, những người khác xuất phát từ Bây giờ bạn đã đọc kỹ thuật số CCTV Harwood, giám sát CCTV, Second Edition, và kiến thức của bạn đến cấp độ tiếp theo! | BONUS MATERIAL 275 interconnects clients and servers. This device makes it possible for devices to share the network bandwidth available on a network. In data communications a hub is a place of convergence where data arrives from one or more locations and is forwarded to one or more other locations. The hub acts as a wiring concentrator in networks based on star topologies rather than bus topologies in which computers are daisy-chained together. A hub usually includes a switch which is also sometimes considered a hub. With respect to its switching capability a hub can also be considered a router. Hue Corresponds to colors such as red blue and so on. Black gray and white do not have hue. Hum Electrical disturbance at the power supply frequency or harmonics thereof. Hum modulation Modulation of a radio frequency video or detected signal by hum. ICCD Intensified CCD A charge coupled device sensor camera fiber optically coupled to an image intensifier. The intensifier is a tube or microchannel plate. IEC International Telecommunications Union An international organization that sets standards for the goods and services in electrical and electronic engineering. See ISO. IDE Integrated Drive Electronics A hard disk drive with built-in electronics necessary for use with a computer. A popular interface to attach hard drives to PCs where the electronics of the controller are integrated with the drive instead of on a separate PC card. Identification image In television the criterion used to determine whether an object or person can be identified in the scene. It requires approximately 7 TV-line pairs to identify an object or person. 276 BONUS MATERIAL IEEE Institute of Electronic and Electrical Engineers A technical organization writing standards and publishing technical articles for the electronic and electrical industry. Illuminance Luminous flux incident per unit area of a surface luminous incidence. Illumination direct The lighting produced by visible radiation that .
