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Why you need digital surveillance

Is your Surveillance System working for you?

Here are 10 reasons why going for digital surveillance will be a great move to make.

  • Monitoring private areas to detect incidents and to co-ordinate police responses.
  • Recording events for use as evidence and to inform investigations.
  • Directed surveillance of suspected offenders.
  • The idea of being identified on camera serves as deterrent for criminal activity – although the evidence for this is inconclusive
  • Allow safe identification of visitors without having to stand in harm’s way or compromise point of entry.
  • Facilitate the identification, apprehension and prosecution of offenders in relation to crime and public order.
  • Provide evidence of a failed appointment in event personnel hired to complete task on site wonderingladyclaims to have left due to your absence.
  • Keep track of persons, vehicles and valuables exiting and entering your premises
  • Greatly boosts the efficiency of security personnel by correcting errors associated with human nature (drowsiness, lunch break, rest room time out, etc.)
  • Keep concerned persons aware of all activities on premises during absence

Insight into Camera Specifications

Insight into Camera Specifications

The main criteria of a camera’s performance are its sensitivity and resolution. Secondary considerations are color or monochrome and indoor or outdoor suitability.

Sensitivity is the camera’s ability to respond to light levels. Resolution defines the amount of picture detail in the image produced by the camera.

Camera Resolution

This is expressed as the number of television lines that the camera is capable of producing. For example a basic bullet camera may have a resolution of 420TVL.

Cameras with much higher resolution have become more affordable in recent times, with small dome cameras now offering 1000TVL resolution.

IP Cameras (Internet Protocol) offer resolutions of 720p(1280 x 720) and 1080p (1920 x 1080). They are connected to recorder by CAT5 or CAT6 network cables.

The latest format is HD-Turbo or HD-TVI. These cameras offer 1080p resolution but the images can be sent over standard coaxial cable.

Whichever type and resolution of camera chosen it must be matched to suitable recorder.

Indoor/Outdoor Cameras

If a camera is to be sited outside and is not going to be mounted in an enclosure it must be classed as weather resistant.

The cable entry points are sealed and most bullet cameras come with trailing leads that allows the connections to be made inside the building. Typically 18inches (~45cm) should be sufficient. One bullet camera under review had only a few centimeters of cable. This means the connection would be exposed to the elements. Needless to say this model did not meet the selection criteria of Cliqenect.

The strength and durability of the casing is difficult to quantify but we have rejected cameras with flimsy plastic enclosures, particularly wireless cameras where the antenna dish looks like it could be easily damaged.

Light Levelslow_light

Choosing the correct camera to operate in ambient light conditions is possibly the most important although most tricky specification to understand.

cctv_cameraLight levels are usually measured in Lux. This is a measure of the light energy arriving on an area 1 meter squared of surface per second.

Typical Light Levels are:

Full Summer Sunlight: 50,000 Lux
Dull Daylight: 10,000 Lux
Shop/Office environment: 500 Lux
Dawn/Dusk: 1 – 10 Lux
Main Street Lighting: 30 Lux
Side Street Lighting: 0.5 – 3 Lux

The golden rule when deciding which camera to use for a given lighting condition is not to choose one that will only just give a picture. Try to give the camera approximately 10 times its quoted minimum scene illumination. Most cameras will be able to cope with excess light. The major problem is when they do not have enough light to produce a picture.

The sensitivity of covert cameras with pin-hole lenses are often quoted as 0.1Lux @f1.4. This seems to indicate that the camera will work in ¼ moonlight. Actually the pin-hole lens will have an aperture ratio of something like f4 and so the camera will need approximately 1 Lux to produce a picture.pin_hole

Unless your house is directly under main-street lighting the light level is probably less than 1 Lux at the front and even lower at the back. Bright security flood lights in theory help but often produce dark shadows a short distance from the house.

A monochrome camera rated at 0.05 Lux will produce reasonable results. Color needs a little more. However, color cameras achieve good night-time vision by switching to a monochrome mode. You will never get good night-time color pictures without huge amounts of additional lighting. So think carefully about the added cost of color over monochrome cameras. As most people are used to color television it sets a standard so it is very common to still select a color camera knowing it will switch to monochrome mode at night.

Monochrome cameras respond well to additional IR (infra red) lighting. With this in mind true night-vision cameras include a ring of IR LEDs. Color cameras also offer IR illumination but as stated previously will switch to monochrome at night even with the IR LEDs turned on. These are true night-vision cameras and are rate at 0 Lux.

Guide to CCTV – Cliqenect Online

Guide to CCTV – Cliqenect Online

There are a vast range of CCTV products and prices to choose from in the marketplace but little information to help discriminate between them. Here are some examples.

A camera described as good in low-level light will often not produce images at night unless there is additional lighting. There may be no explanation or qualification of the term low-level light.

Wireless cameras can be fitted in minutes as there are no cables to run back to your TV or monitor. However, the cameras still require a power source and while battery power is convenient, the energy consumption is great giving a working time of less than 24 hours (as low as 2 on some products tested).
Wireless connectivity is nevertheless very useful for some applications however.

At Cliqenect, we test various CCTV products, and use only equipment that meet your security surveillance requirements.

Cameras
The traditional CCTV camera has a very industrial style and, therefore, many people would not find this suitable for fitting to their homes or shops.analog-cameras
This traditional style is actually a housing that is designed to keep the camera dry and within the recommended operating temperature. Thermostatic heating elements within the casing also reduce condensation and misting.
These types of top-end cameras are usually specified without a lens, this being chosen to give the required focal length and field of view. Motorized pan and zoom lenses allow an observer to follow or move in closer to the person or object in view.
We can supply these types of cameras to those of you who do not find the price prohibitive. Please contact Cliqenect here with your requirements.

orignallogoFortunately, for those of us with more down-to-earth budgets modern technologies now allow the production of cameras with excellent performance. There are two common types of CCTV cameras, CMOS and CCD. CMOS sensors were used for the lower quality cameras. However, with the introduction of High Definition CMOS sensors from Sony this is no longer the case.
There is little point installing a CCTV camera if it is incapable of allowing you to easily identify who or what is being captured and recorded. CCD and HD CMOS cameras provide pin-point clarity and are deployed by Cliqenect wherever possible.At the lower resolution the Sharp sensor is now extremely good and is ideal in capturing quick changing scenes.Integrated cameras and lenses often referred to as “bullet cameras” are sealed to prevent ingress of moisture. The sealing is so good that they can be permanently immersed to some considerable depth in water if required.
Bullet cameras do not need a heater and their small size makes them highly suitable for fitting to domestic and commercial properties. It is not possible to make adjustment to these cameras because they are permanently sealed. Most of the bullet cameras Cliqenect deploys are fitted with a 3.6mm lens which gives a 72 deg angle of view which is suitable for most domestic and small commercial properties. Please contact us if you require alternatives.
Another type of enclosure is the Anti-Vandal dome. modern-cameraAgain the cameras are sealed and often specified with IR LEDs for night-vision. These type of cameras are now the most popular for domestic and commercial installations.
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