HD as we all know is the acronym for High Definition. So what does it really mean in the world of CCTV?
HD can mean 720p or 1080p in broadcast terms but can also be applied to 4K and above surely? The answer isn't quite so simple. In order to fit the standard, images must be displayed at 25 images per second. With the processing power required to decode and record many cameras, not all systems can cope. Many will resort to recording a maximum of 12.5 images and some at a lower quality.
It is important however to decide what your needs are. If motion is likely to be slow moving, do you need the full 25 ips frame rate? The answer is almost always no. If you are monitoring moving vehicles then the more images per second, the better.
Beyond the consideration of images per second is hard disc space. If you imagine that 1 terrabyte of storage is required per 1080p camera per month then you wouldn't be too far off.
As you can see, HD brings challenges especially with IP on existing networks as the extra information in the images mean extra bandwith use.
So how much extra?
Well, each image in a high resolution analogue camera would have 345,600 pixels
In the latest 960H analogue cameras that grew to 558,720 pixels
720p 921,600 pixels, 1080p 2,073,600 and 4K 8,847,360.
1080P then has roughly twice as much detail as 720p and 6 times that of a standard analogue system.
So is HD worth it? You bet!
Moore Secure (North)
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