By Herman Kruegle
This revision of the vintage booklet on CCTV know-how, CCTV Surveillance, offers a complete exam of CCTV, masking the purposes of varied structures, find out how to layout and set up a process, and the way to settle on the appropriate undefined. bearing in mind the ever-changing advances in know-how utilizing electronic innovations and the web, CCTV Surveillance, moment variation, is totally up-to-date with the new developments in electronic cameras and electronic recorders, distant tracking through the web, and CCTV integration with different safety platforms. carrying on with within the celebrated culture of the 1st version, the second one variation is written to function an invaluable source for the end-user in addition to the technical practitioner. each one bankruptcy starts off with an outline, and offers the newest details at the suitable apparatus, describing the features, beneficial properties and alertness of every machine. assurance of getting older or out of date expertise is lowered to a historic standpoint, and 8 fresh chapters disguise electronic video know-how, multiplexers, built-in camera-lens-housing, clever domes, and swift deployment CCTV platforms. * Serves as an crucial source on CCTV thought* comprises 8 new chapters at the use of electronic elements and different similar applied sciences that experience obvious a up to date explosion in use * absolutely illustrated, the publication includes thoroughly up-to-date pictures and diagrams that signify the most recent in CCTV know-how developments
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Extra info for CCTV Surveillance, 2nd Edition 2006 Video Practices and Technology
The transmission media carries the electrical video signal from the camera to the remote monitor. Hard-wired media choices include: (a) coaxial, (b) two-wire unshielded twisted-pair (UTP), (c) fiber-optic cable, (d) LAN, (e) WAN, (f) intranet, and (g) Internet network. Wireless choices include: (a) radio frequency (RF), (b) microwave, or (c) optical infrared (IR). Signals can be analog or digital. Monitor. The video monitor or computer screens display (CRT, LCD or plasma) the camera image by converting the electrical video signal back into a visible image on the monitor screen.
Its FL is variable from wide-angle to narrow-angle (telephoto) FOV (Figure 2-14). The overall camera/lens FOV depends on the lens FL and the camera sensor size as shown in Figure 2-14. Zoom lenses consist of multiple lens groups that are moved within the lens barrel by means of an external zooming ring (manual or motorized), thereby changing the lens FL and angular FOV without having to switch lenses or refocusing. Zoom focal length ratios can range from 6 to 1 up to 50 to 1. Zoom lenses are usually large and used on pan/tilt mounts viewing over large areas and distances (25–500 feet).
To detect one object located within the area of another the objects must differ in reflectivity, color, or texture. Therefore, if a red box is in front of a green wall and both have the same reflectivity and texture, the box will not be seen on a monochrome video system. In this case, the total reflectivity in the visible spectrum is the same for the green wall and the red box. This is where the color camera shows its advantage over the monochrome camera. The case of a color scene is more complex.