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IP and Megapixel Cameras:

For clients who require maximum quality images from their CCTV cameras, the only option really is megapixel cameras. Some manufactures such as aVIGILon have managed to bring out cameras which have 29 Megapixels but expect to pay a high price for this camera. Most megapixel camera installations range from 1 to 5 Megapixels. It is important to note that on the larger MP cameras, more processing power is required by your PC / Server and more bandwidth is required over the network so careful design methodologies need to be taken into consideration when designing a multi-megapixel system.

This is an area where a company with little experience can go horribly wrong and you end up with a system which either does not function properly or costing you a lot more than you originally budgeted on.

With years of experience in this field, we can confidently guide our customers through this process to ensure the best product to suite your needs and budget are catered for.

Similarly to Analogue and HD Analogue, IP and Megapixle Cameras also come in 4 basic variants:

Dome Cameras: These are typically installed indoors and areas where aesthetics could be important. These cameras can come in a number of models and have a number of features. See below explanation of the various features. The advantage to dome cameras is that one does always know where the camera is looking at and thus “what it can see”. Dome cameras either have a “fixed lens” or a “veri-focal lens”. The fixed lens cannot be adjusted and typically would be 4mm (fairly wide range but not much depth). A variable focus lens typically is a 3 to 9mm or 2.8 to 12mm adjustment available. The larger the mm number, the further the camera can be “zoomed” in.

Bullet Cameras: Generally available in the same features as their dome counterparts, bullet cameras are generally used outdoors and almost always have built in Infrared (IR) illumination. Because they are very directional, it becomes quite easy to work out where there general field of view is. As with Dome cameras, bullet cameras come in either fixed or veri-focal lenses.

“Box” or CS Mount Cameras: These are what most people understand a CCTV camera to look like. Box cameras have the advantage of fitting different type of lenses especially if the distance from the camera is quite far, a large (22 to 50mm) lens could be fitted. Box cameras don't however have the added advantage of IR built in. This can be overcome, however, if IR illuminators are utilised. Our preference is to avoid box cameras if possible.

Pan/Tilt/Zoom or PTZ: These usually quite large in size and more often made for outdoor applications where a large area needs to be covered and the ability to zoom in on an object / person is a requirement. As the name suggests, the camera can “Pan” i.e. rotate usually up to 360°, “Tilt” up and down and zoom in and out – the larger models typically delivering up to 36x Zoom capacity. These cameras would usually also have built-in or optionally addable Infrared (IR) illuminators.

 

Some terminology you may encounter regarding your camera selection would be:

•  Wide Dynamic Range (WDR) which refers to the cameras ability to capture clear images of objects surrounded by a strong back light, while still keeping the background visible. This would be used in a variable light environment.

•  CCD or CMOS – This is the sensor which captures the image onto the camera and is at the heart of the camera. The 1/3” typically referred to is size of the sensor.

•  LUX Level – LUX Levels refer to the lighting conditions the camera can operate in. Here is a chart to help you understand LUX Levels

0.0001 LUX

Poor Starlight

5 LUX

Average street light

0.001 LUX

Normal Starlight

10 LUX

Sunset

0.1 LUX

Normal Moonlight

15 LUX

Good street lighting

0.3 LUX

Full Moonlight

300 LUX

Minimum requirement for easy reading

1 LUX

Twilight

500 LUX

Well lit room

2 LUX

General minimum lighting for security

5000 LUX

Overcast Day

•  IR (Infrared) – Most cameras would typically be equipped with IR illumination. This gives a camera the ability to work in near zero lighting conditions. Bear in mind, when a camera switches to “black and white”

•  DN – Day / Night camera. This is if a camera either has IR or can work in very low lighting conditions.

•  IP65 (or other number) – This refers to the “Ingress Protection” of a camera or device. Typically an “outdoor” product will be rated at IP65. The 6 being dust-proof and the 5 being waterproof to sprays of water. 66 would be heavy jets of water, 67 is partial submersion in water and 68 being permanent submersion in water. Click here to view this handy IP Chart.

•  “x”mm lense: Typically “fixed” lenses will have just one number – generally 4 or 6mm. This means the camera lens cannot be adjusted and what you see is what you see. If a lens however has a range (typically 3 to 9mm or 2.8 to 12mm adjustment is available. The larger the mm number, the further the camera can be “zoomed” in.)

•  Megapixel: Megapixel refers to the image quality and resolution the camera can deliver. The higher the resolution, the better the image quality and the less an image will pixelate when zoomed in. Most IP cameras these days start at 1 or 1.3 MP resolution and are most commonly found in a 2, 3 and 5 MP variety.

•  Auto Iris: If a camera has auto-iris, this means it can adjust the amount of light being let in and would typically be used where there are variable lighting conditions which e.g. a petrol station with cars pulling up with headlights or a camera that pointed in the direction of the sunrise / sunset.

 


Some of the HD Analogue brands we supply and support

 
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e-mail: info@libtech.co.za | | 021 930 4959 | 083 954 3649