CCTV Systems

Delta Security offers a full range of CCTV products utilizing Analogue, IP and Hybrid technologies from a number of quality manufacturers and suppliers. A complete CCTV portfolio enables us to offer a complete solution design tailored to address our individual customer needs.

CCTV System Types:

Delta Security offers a full range of CCTV solutions to meet a customer’s specific requirements.

• Analogue Camera Systems ~ these use analogue cameras that are connected to a Digital Video Recorder (DVR). Analogue cameras come in a varying range of quality and cost so Delta Security regularly bench test new cameras to ensure that we can recommend cameras that meet the exacting standards of build quality, low light operation and high quality image processors that we require. Camera manufacturers usually state resolution in TVL’s, which range from 400tvl to 700tvl and Delta Security aim to install cameras that are always at the highest resolution possible. DVR’s have replaced the older time-lapse video recorders for recording of camera images and these also vary in quality and cost. The quality of recorded images is dependent on two main factors; resolution of recorded images (CIF) and picture per second recorded (PPS). Delta Security aim to offer D1 (highest quality) recording at a minimum rate of 6pps on all systems.
• IP Camera Systems ~ these systems use IP Network cameras connected to the client’s Local Area Network (LAN) and the images are stored on Servers. IP cameras stream video images (large data sizes) over the LAN and as such require the Network to be the highest quality possible utilising a fibre backbone with high quality Gigabit switches. IP camera systems are only as good as the Network they work with so they may not suit every application.
• Hybrid Systems ~ these are DVR’s that have the capacity to record analogue cameras but also have the ability to record a number of IP cameras. This means that analogue cameras can be used to keep the cost and network requirements within budget but IP (Internet Protocol) Mp (Megapixel) cameras can be added for key areas that require a higher degree of image resolution.
• HD Systems ~ this is one of the newest technologies in CCTV and allows the use of HD (1080p) cameras to be recorded to a DVR. HD cameras require co-axial cabling (full copper core) and record onto a DVR at HD quality. If an existing CCTV system requires upgrading for better images and has a good co-axial infrastructure then a HD system would definitely be a consideration.

Explanation of CCTV terms:

Record Quality: the standard of measurement for quality is CIF with options of recording are usually offered on CCTV recorders, these are:

QCIF (176x144 pixels) ~ lowest quality
CIF (352x288 pixels) ~ low end quality
2CIF (704x288 pixels) ~ medium quality
VGA (640x480 pixels) ~ standard VGA quality
D1 (720x576 pixels) ~ high quality analogue DVR
720P (1280x720 pixels) ~ 720p high definition IP systems
960p (1280x960 pixels) ~ 960p high definition IP and some analogue DVR’s
1.3Mp (1280x1024 pixels) ~ 1Mp high definition IP systems
2Mp (1600x1200 pixels) ~ 2Mp high definition IP systems
1080p (1920x1080 pixels) ~ HD high definition systems
3Mp (2048x1536 pixels) ~ 3Mp high end IP systems
5Mp (2592x1944 pixels) ~ 5Mp high limited high end IP systems

Frames per Second (FPS) ~ Pictures per Second (PPS): the number of video images recorded per second. It is reckoned that the Human Eye can only see at 16fps (unless at times of stress / adrenaline), so to record at 25fps may not be required (unless in a Casino or cash handling environment) and we would recommend that a frame rate of between 6fps ~ 10fps is used.

Continual or Motion Detection Recording: whether the unit records constantly or when pixel movement on screen is detected. When motion detection is used it is hard to say how long the recording storage time will be as it will be dependent on pixel movement (clouds, tree movement etc) and we would normally record continually or with internal cameras on motion detection only.

Image Quality: image quality is defined by four terms – Monitor, Detect, Recognise and Identify:

 

• Monitoring ~ when reviewing images it is possible to track the presence and movements of a person within view with an image of a 1.6m person taking up 5% of the screen height.

• Detection ~ when reviewing it allows observation of persons around an incident and supply details of individuals (hair colour, clothes style etc) but without the ability to recognise the person. The image of a 1.6m person taking up 10% of the screen height.

• Recognition ~ when reviewing images persons can be recognised from the images with a high degree of certainty with an image of a 1.6m person taking up 50% of the screen height.

• Identification ~ when reviewing images the detail should be of a quality to enable a person to be identified to a level to allow prosecution with an image of a 1.6m person taking up 120% of the screen height.

 

Delta Security can offer a free survey of any new or existing CCTV system and discuss with the customer which system would suit their requirements and budget.