Video Surveillance & CCTV Introduction Video

Author: John Honovich, Published on Jan 04, 2009

Getting started with video surveillance? This report covers the basic elements of video surveillance, walking you through each aspect including cameras, recorders, power, cabling and wireless.

In addition to the report, we are providing a high quality 30 minute video "Introduction to Video Surveillance," to help those who prefer to watch and learn. Two excerpts of the video are included in this report. The entire downloadable video only costs $9 USD.

CCTV vs Video Surveillance

Before you learn about any technical details, you should know that the field is called by a few names: CCTV, Video Surveillance and IP Video.

CCTV is the most traditional term and is still the preferred term in the UK and Commonwealth countries. The acronynm stands for Closed Circuit TV and signifies that the video is not publicly shared (i.e., it is closed unlike broadcast TV which is public). For better or worse, the term CCTV is increasingly viewed as referring to legacy, outdated technology.

Video surveillance is the most commonly used term in most of the world and the most accurate. Video is being used to surveill, that is to watch, the activities of an area. It does carry negative connotation for the general public because of the implication that people are being watched and privacy is being compromised.

IP Video is the newest term and reflects the new wave of technology that is being used in video surveillance / CCTV systems -- the use of computers to capture, record and transmit video.

VCR vs DVR

Almost everyone records the video from their surveillance cameras. The choices are actually similar to what you have for entertainment: VCRs, DVRs and NVRs.

A surprising number of people still talk about and search for VCRs (20% of Google searches for security recorders are still for VCRs).

Get Video Surveillance News In Your Inbox
Get Video Surveillance News In Your Inbox

However, in 2009, literally no one should be using a VCR because the costs are so close and the functionality is so superior for DVRs. Indeed, the new trend is away from DVRs and to NVRs.

PC vs Appliance

When choosing your recorder, you can use an appliance - that is a purpose built computer that has the video management software pre-loaded or you can buy your own PC and build it yourself.

At the very low end, using an existing PC can save you money. If you only want to record a few cameras and you do not want to spend much money, you can take the time to install an encoder card and load the software on your PC.

If you do not want to spend a lot of time, an appliance (for example, a DVR) is a simple way to quickly and simply connect cameras and have a video management system. This is a common choice in the range of 8 - 32 cameras.

Power

All your equipment is going to need power. With the recorder, power is generally pretty simple because (1) its usually in a fixed position and (2) its usually near a power supply (like most desktop PCs). With cameras, providing power can be much trickier. Usually you will put cameras all over your facility and often outside of your facility as well. The challenge here is that most locations you want to put cameras are not close to power outlets. Making the issue worse, for both security and aesthetic reasons, you do not want to run a power cord from the camera down to a wall outlet.

The general solution is to run the power on a cable alongside the camera. Indeed, there are special cables made for just this (often called siamese to indicate cables for both power and video transmission). If you are installing multiple cameras, you can run these cables back to a headend and then use a camera power supply to terminate power for all cameras.

Most security cameras are powered by either 12V DC or 24V AC power sources. The vast majority of consumer security cameras (for use in home and small business security camera systems) utilize 12V DC power supplies. This low voltage is consumer friendly and the 12V DC power supply can simply be plugged into a standard wall socket. For large scale commercial systems 24V AC is very commonly used to power security cameras. The voltage drop over longer cable lengths (which can be hundreds of feet or more) is much less significant with 24V AC versus 12V DC.

If you are using IP cameras, you can run power and video transmission directly over your network cable (caled power over ethernet or PoE). However, you need a special switch or device to provide PoE and that adds about $30 more per camera.

Cables and Connectors

Two of the most common types of cables used are the RG-59 coaxial cable and the 'All-in-One' cable. The RG-59 coax cable is very common in commercial installations where cable runs are long and a robust, shielded transmission cable is a must. However, use of coax cable requires the proper stripping an installation of connectors to ensure proper video signal transmission and is best left to professionals. For consumer security cameras, the All-in-One cable, which is comprised of a 12V power cable joined a video cable is the most popular choice. The All-in-One cable is convenient to use and is suitable for the short distances typical of a home or small business system.

The two most common types of connectors in consumer security cameras are the BNC and RCA type connectors. Depending on the manufacturer the video output cables of the camera are fitted with BNC and others with RCA. Some of the All-in-One cables have BNC or RCA terminals, again depending on the manufacturer. Same with the recording device. There are adapters that allow the BNC connector to be used with the RCA connector to allow connection of the security camera, All-in-One cable and the recording/monitoring device.

Camera Chip

The vast majority of security cameras utilize a CCD (charge coupled device) composed of thousands of individual sensors that translate the incoming light into an electrical video signal. This video signal is then sent to a recording device or monitor where it is converted into video images. This video clip demonstrates some of the basics of CCD chips:



Size of Camera Chips

The three most common CCD chip sizes used in security cameras are 1/4", 1/3" and 1/2". In general, for a given quality of chip, the larger the chip size, the more area available for light gathering and the more sensitive it is to incoming light. However, a larger CCD chip of inferior quality may not necessarily be brighter than a smaller chip with a superior design. The 1/3" chip seems to be the most common size used in consumer security cameras. Consideration of CCD size is important when choosing the focal length as this will affect the coverage width and magnification.

Wireless Transmision

While using cables is the most common way of transmitting surveillance video, wireless video is often used to deploy cameras in places where laying cable is problematic.

Many, if not, most security incidents happen outdoors. The challenge with outdoor surveillance is that this can be over large areas and those areas rarely have ready access to conduit, cables or existing network infrastructure. Wireless systems are used to overcome this problem.

Wireless systems range from simple $100 short tange kits to systems that cost tens of thousands and can cover cities. (Be careful with cheap wireless though as wireless system deployments are risky.) This video excerpt demonstrates the basic concepts behind wireless transmission.

If you are trying to learn the basics, the Video will help you see and appreciate the various aspects of video surveillance.

If you have questions about basic video surveillance topics, definitely use the comments to ask. Let's make this a forum for beginners to learn about video surveillance.

Related Reports

The Russian SMP Security Robot on Dec 08, 2016
A Russian manufacturer, SMP, has a commercially available outdoor security robot, at a lower price and with much less marketing than their main...
IP Networking Course January 2017 on Dec 08, 2016
This is the only networking course designed specifically for video surveillance professionals plus it includes live training, personal help and...
Power Drill Selection Guide on Dec 06, 2016
Boring holes is a basic part of running cables for most security system projects. To do so, you will need to choose the right drills for various...
Genetec Lower Cost Sharp V LPR Camera on Nov 23, 2016
Genetec has announced the latest offering in their AutoVu Sharp line, promising new features, simplified installation, and lower price. In this...
Massively Strong Maglock (Securitron) on Nov 16, 2016
One of the market's strongest maglocks has a twist: the 4,000 pounds claimed bond power is not purely magnetic. Securitron's hybrid MM15 maglock...
Dahua 4MP HD Analog Tested on Nov 10, 2016
A few years ago, analog was SD only. In the past few years, HD analog, up to 1080p, has become commonplace. Now, HD analog is doubling its max...
Intel Movidius Targets Video Surveillance Market on Oct 25, 2016
The most commonly used chips in IP cameras come from Ambarella, Hisilicon or TI. Now, Movidius, who Intel announced acquiring in September, is...
Move Aside Cisco, Axis Has A Network Switch For Integrators on Oct 18, 2016
Cisco is a common choice for network switches, including in our Favorite Network Switches survey, but now Axis is releasing a 16 port PoE+ switch...
Lead Hikvision Ezviz Direct-to-Customer Sales on Oct 10, 2016
Hikvision continues to ramp up its direct-to-customer sales. And you can lead the team. In this note, we examine what Hikvision is seeking, what...
4 Biggest Low Light Problems on Oct 10, 2016
100 integrators told IPVM what their biggest problems were with low light images. The most commonly cited themes were: Limited IR Range Uneven...

Most Recent Industry Reports

Knightscope - $122,509 Revenue, $2.5 Million Loss Seeks $20 Million Investment on Dec 09, 2016
The robot that ran over a child, Knightscope, wants money and they need it. Investors can invest as little as $1,000 to participate and...
The Russian SMP Security Robot on Dec 08, 2016
A Russian manufacturer, SMP, has a commercially available outdoor security robot, at a lower price and with much less marketing than their main...
How Hikvision Beats Its OEMs on Dec 08, 2016
Hikvision GM declared that they are not aggressive with their competitors. But some of their own OEM partners disagree. Inside, we reveal a key...
Dahua Discontinuing H.264 Only Products on Dec 08, 2016
Dahua has taken a stand for H.265 and is discontinuing its H.264 only products. We examine the shakeup inside this...
IP Networking Course January 2017 on Dec 08, 2016
This is the only networking course designed specifically for video surveillance professionals plus it includes live training, personal help and...
Hikvision vs Dahua Mobile Apps Tested on Dec 07, 2016
With smartphone use and low-cost video recorders surging, many user's main interface to their surveillance system is their phone. With mobile video...
Paxton Drops US Reps, Plans Major Expansion on Dec 07, 2016
Paxton is gearing up to make a big run at  US access control success. The first step they have made is to cut all US Rep Firms, in anticipation of...
Axis Partner Elder Care Video Analytics (Smartervision) on Dec 07, 2016
Can video analytics be used to improve the care of the elderly? Axis and a video analytics startup, Smartervision, are working together to do so....
Sony IP Camera Backdoor Uncovered on Dec 06, 2016
A backdoor has been uncovered in ~80 Sony IP camera models, attackers can remotely enable telnet on the camera, and then potentially login as root,...

The world's leading video surveillance information source, IPVM provides the best reporting, testing and training for 10,000+ members globally. Dedicated to independent and objective information, we uniquely refuse any and all advertisements, sponsorship and consulting from manufacturers.

About | FAQ | Contact