Questions and answers on "CCTV"

FAQ (Frequently Asked Questions)

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Is it possible to view the DVR images from remote?

it is necessary to use the dedicated Apps and make the appropriate settings on the router.

How does a camera with “Day & Night” function work?

A camera with "Day & Night" function is able to capture normal colours in conditions of adequate lighting (daytime light conditions). When available light is low (night-time light conditions), the sensitivity of the camera can be increased by using infrared viewing. This is done by removing the infrared blocking filter used to achieve good colour output.

How does the Autofocus work?

Autofocus is a function present in cameras with a motorised lens. The autofocus function guarantees the sharpest possible image through automatic and continuous focus adjustment.

What difference is there between CIF, HALF D1 and D1 resolutions?

The essential difference lies in the resolution:

- CIF: 320x288 PAL / 320x240 NTSC
- HALF D1: 720x288 PAL / 720x240 NTSC
- D1: 720x576 PAL / 720x480 NTSC

By analysing these data against video quality (which can be low, normal, high or very high), we can determine how much space in kB a video frame occupies on a HDD.
CIF ranges from 1.8 kB with low quality to 6 kB with very high quality
HALF D1 ranges from 3.6 kB with low quality to 12 kB with very high quality
D1 ranges from 7.2 kB with low quality to 24 kB with very high quality

From these figures it is a simple matter to calculate how much space is occupied by recordings made by a camera operating in real time, i.e. at 25 Fps for an hour of recording.

For example:
CIF format, High quality = 6 kB 1 Frame
6 x 25 Frame = 150 kb per Sec
150 x 60 = 9000 Kb per minute
9000 x 60 = 540,000 Kb per hour
540,000 : 1024 = 527.35 MB

1 MB = 1024 KB.
Likewise, 1 GB is equivalent to 1024 MB and 1 KB to 1024 byte. 1 byte is equivalent to 8 bit.

How many hours of recordings can a HDD contain?

It depends on the resolution, quality and number of images per second you set (the higher the resolution, quality and frequency, the smaller the number of recording hours the HDD can hold). As a guideline, consider that with a resolution of 320x240, a quality of 70% and 2 images per second, recordings take up about 1MB per minute per channel. But if you set to record with movement detection and optimise the movement detection settings, the number of recording hours can be increased enormously: if there is no movement nothing will be recorded.