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[资源] 【分享】Digital CCTV_A Security Professional's Guide.2008

Digital CCTV_A Security Professional's Guide
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Authors(Editors):
Emily Harwood
Publisher: Butterworth-Heinemann
Pub Date: 2010
Pages: 328
ISBN:
ISBN 13: 978-0-7506-7745-5
ISBN 10: 0-7506-7745-7

Introduction
Growth naturally stimulates change, and CCTV technology has
been no exception. A system that once merely required cameras,
cabling, and video monitors has now become a complex electronic
confi guration of equipment intertwined with both computer and
telecommunications technologies. This dramatic change is directly
related to the introduction of digital technology. Why do we need
to understand how digital technology works, and what does it
have to do with the future of security? It’s simple—the newest
revolution in technology is pervasive computing. Computers
are or soon will be everywhere, linked to everything, and everything
will be connected by the Internet—including security
systems.
Upheavals within the electronics industry have been persistent
and are well known. For example, most everyone remembers
how eight track players were relegated to the trash heap without
so much as a backward glance. Phonograph records were shut out
by compact discs and the consumer VCR has virtually been
replaced by the DVD player. In the security industry, the revolution
from analog to digital is similar to these earlier advancements
and will probably be looked at with the same amount of disdain
regarding archaic processes of the past. Digital technology is
exploding around us, yet a large amount of industry professionals
are still looking for a comprehensive explanation of digital video
as a security technology.
Security professionals today understand how the components
of a CCTV system work. They know the applications, limits,
strengths, weaknesses, and relative costs of lenses, cameras, camera
mounts, pan/tilt units, and housings. Such knowledge enables
professionals to design systems and to select from a myriad of
products just the right components, resulting in a CCTV system
that will meet customer performance requirements and budgets.
There is, however, a concern that digital CCTV equipment
concepts have not been adequately explained. The reality is that
digital technology is much more than a trend and requires a rather
extensive learning process if one can intelligently buy, sell, install,
or recommend digital video products. In today’s environment, it
is essential for the security professional to know how the Internet
works and how LANs and WANs function in relation to the World
Wide Web.

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