CCTV: COMPARISON BETWEEN ANALOG SYSTEM AND DIGITAL ONES |
Analogical systems CCTV are born around 1960
for military application
CCTV, or closed circuit television, is a term which refers to a system of analog security cameras. CCTV cameras have been used effectively in many industries since their introduction in the 1960s. However, with the development of the IP camera systems of the future, traditional analog cameras of the past are becoming less competitive, and "CCTV" has begun to refer to any system of security cameras.
Analog CCTV systems begin to be popular in the 1970s for security and videosuirveillance
applications. The typical surveillance system was comprises of four components: a camera,
a cable network,a recorder, and a CRT monitor. Over the last 10 years thanks to the modern technology each one these
components have been digitized.
Schematically the greater limitations of the analog CCTV systems are:
- High maintenance costs: change of tapes, head alignment of video recorders etc.
- Image deterioration with time: Due to the cyclical tape use by the recorder, that over the time produce a quality degradation of the captured video
- Limited integration:Each installation of a new camera introduce excessive costs and time for redesign the entire system.
- Remote access not allowed: it was not possible have a remote access to the information recorded in different physical place.
In the
1990 the first digital recorder was born.
With the approach of the modern recording techniques it was possible to obtain the following advantages:
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The data access function was improved
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The image degradation was eliminated due to the digital nature of the device
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The compression and memorization techniques was improved
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The data access techniques was improved
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The new device are much more scalable and extensible
DVR technology versus modern IP Network Solution Surveillance
The digitization process makes devices function better and more efficiently for the
end user, and over time they also become much more cheaper than in the past. Most
products follow an evolutionary path beginning with discovery, through stages of
constant technological innovation, and then mass production.
With continuous product improvement come
better-functioning products, lower costs, and a steadily growing customer base.
After a
few years, the product based on digital technology begins to dominate the entire world market.
The same process of digitization has been playing out in the CCTV industry over the
last few years. Digital video recorders (DVRs) now constitute up to 80% of new CCTV systems.
But as end users have
become more familiar with DVR technology, they've realized that the DVR represents
just one more step in the ongoing digital evolution of CCTV systems.
Innovation has
continued beyond the DVR, and a viable, cost-effective alternative has emerged: IP Surveillance
or Networked Video. IP-Surveillance technology offers for the first time video transferred
over IP infrastructure-finally a surveillance concept that is fully digital.
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