CCTV

CCTV

CCTV Installation

CCTV is massively powerful tool for not just deterring crime, but also capturing the people responsible should you be unfortunate enough to be a victim of crime.

Closed Circuit Television (CCTV)

 

select security systems genie bulletClosed-circuit television (CCTV), also known as video surveillance, is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors.

It differs from normal household television in that the signal is not openly transmitted, though it may employ point to point wireless links.

Although almost all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require monitoring such as bars, banks, casinos, schools, hotels, airports, hospitals, restaurants, military installations, convenience stores and other areas where security is a requirement.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central control room, for example when the environment is not suitable for humans. CCTV systems may operate continuously or only as required to monitor a particular event.

A more advanced form of CCTV, utilizing digital video recorders (DVRs), provides recording for possibly many years, with a variety of quality and performance options and extra features (such as motion detection and email alerts).

More recently, decentralized IP cameras, some equipped with megapixel sensors, support recording directly to network-attached storage devices, or internal flash for completely stand-alone operation.

There are about 350 million surveillance cameras worldwide as of 2016. About 65% of these cameras are installed in Asia.

CCTV use is widespread in the UK.  According to newspaper reports (Telegraph, Guardian) there is a surveillance camera for every 11 people.gemini security solutions cctv dome

Cameras are widely and overtly deployed every day, they are sited within both over-ground and underground train carriages, above supermarket checkout points almost any place you can think of.

Whatever our own personal views, the irrefutable benefit of CCTV systems are its crime prevention and detection capabilities.

Like it or not, monitored camera surveillance is essential in many businesses, not just for the safety of staff and customers, but also for the security of the premises, property & cash.

 

System Technologies

When investing in a CCTV solution you are presented with an almost overwhelming number of choices. However, the real consideration will be whether to invest in an Analogue (HD) or IP CCTV cameras.

 

Recording & Monitoring

gemini security solutions genie wnvr432p5CCTV recording cameras are linked to recording devices (DVRs / NVRs) either locally or onto an internet network.

Recorded images can then be monitored efficiently and safely from a remote point, password login can give access even to hand-held devices such as tablets or mobile phones connected to the internet.

Technology has evolved a long way forward since its first use by Siemens back in the 1940s.

 

Analogue Camera Overview

An Analogue surveillance camera is fitted with a CCD (charge-coupled device) sensor that digitises the light that falls on its surface capturing the image for processing.

Before transmission of the video, the image has to be converted back to an analogue signal so that it can be viewed on video monitor or recorder.

Analogue cameras must be NTSC/PAL compliant and are limited to a maximum resolution that is equivalent of 0.3 megapixels.

Analogue CCTV systems transmit video over coax or UTP (unshielded twisted pair) cabling to a digital video recorder (DVR).

At this point the video is digitised and stored.

Most modern DVRs have network capabilities giving the user the option to access the feed remotely from a local area network and with the proper configuration, from across a wide area network or over the internet.

The benefit of a local area network set-up is that there are no videotapes to change; instead the video is stored on hard drives or a networked drive typically on a FIFO (first-on, first-off) basis so that there is always a rolling video archive over a user defined number of days / months.

 

Analogue HD

We are currently upgrading existing CCTV systems which are cabled with coaxial cable (traditional analogue wiring) with HD cameras as a good upgrade solution which removes the added cost or re-cabling.

Our CCTV supplier has a large range of high quality HD-SDI cameras, recorders and accessories available. HD-SDI (High Definition Serial Digital Interface) unites the high quality images of IP with the point to point configuration of analogue systems.gemini security solutions genie wip5bv5

This technology is a great way to upgrade an existing analogue system to digital. (*Subject to cable quality)

• Unlike IP, HD-SDI operates over the familiar closed circuit system which eliminates any security threats that could compromise the system and also the need for IT expertise to
support and manage it.

 Similar to your HD TV at home HD-SDI can offer impeccable picture quality for your CCTV system giving 720p and 1080p resolution in real time (25fps). This broadcast quality does not have bandwidth issues since it is connected directly to the DVR from point-to-point.

• HD-SDI Digital Video Recorders generally allow remote access via a web browser or mobile phone device to enable the system to be monitored and controlled remotely if required.

 

IP Camera Overview

gemini security solutions gemini wip4vdv5g“IP” stands for Internet Protocol which is the low-level programming language used to transmit data between computers in your home and the Internet.

This means that an IP camera is like a little computer that you connect to, to access your video and as such you do not require a direct connection to a PC to operate meaning they can be placed anywhere within a network and accessed remotely at any time.

Consequently they do not require a DVR; instead they operate with a NVR (network video recorder), which in most cases is just software that runs on a computer or server as it doesn't need to convert analogue video to digital.

The video footage can then be stored on new or existing network RAID (redundant array of independent disks) drives as directed by the NVR software.

In contrast to an Analogue camera, an IP camera excels in capturing high definition, megapixel images as captured data is digitized directly from the sensor, and because of their increased computing power they can perform more advanced functions such as detecting motion to trigger recording or tampering and act on it by emailing, uploading or recording images or video to an internal storage card external storage device.

 

Why Analogue and IP Each Have Their Place

With the addition of any new technology there is always a period of adoption and adaptation.

Gemini Security Solutions will still supply & Install Analogue cameras if we feel that they will meet the client’s security requirements.

For an impartial look at IP Cameras v Analogue Cameras we have detailed below a list to compare the attributes and limitations of both technologies:

 

Compatibility

Analogue: Analogue video has been a universal standard for several decades. Virtually any analogue CCTV camera can be plugged into any DVR, regardless of brand.gemini security solutions camera tower

IP: Each time you add an IP camera, you have to make sure that the NVR supports that particular model. However many IP camera producers now support a large variety of communication protocols.

 

Cost

Analogue: Analogue cameras and peripheral equipment are significantly lower in price to their IP counterparts but in the long-term can be more expensive due to limits on the number of fixed camera per DVR.

IP: Whilst the actual purchase cost for an IP camera is more expensive, in many scenarios it is more cost effective in the long-term. A single IP camera can do the job of several analogue and it is easier to expand in the future.

 

Quality

Analogue: Analogue CCD cameras perform well across a variety of lighting conditions and manage motion well.

Analogue cameras transmit the video image to the DVR uncompressed where it can be viewed live with no latency pre-compression.

IP: IP cameras excel in capturing high definition, with the ability to zoom in. However some IP cameras can introduce latency, which becomes an issue when an operator needs to track something live. For this reason Gemini Security Solutions a very careful in choosing the manufacturers we use.

 

CCTV Maintenance

Analogue: Analogue cameras are unmanaged devices as they are pretty simple in comparison.

However, at Gemini Security Solutions we would still recommend an annual maintenance contract to ensure the available images are always the best possible.

IP: An IP camera is a network appliance and requires specialist maintenance – this is something that can be covered by an annual support/maintenance contract, which may add to the overall system cost.

See Maintenance for further information.

 

Expansion & Storage

Analogue: DVR costs are fairly simple to understand. A DVR is a single unit, and has a single cost. However have a fixed number of inputs that cannot be expanded upon.

IP: NVR software is typically licensed on a per camera basis and must be installed on a networked computer. The storage requirements for megapixel cameras are significant, and may require additional network storage.

 

 

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