Within the CCTV sector, (analogue) we see HD being advertised everywhere, and it can be misrepresented when it comes down to the nitty gritty. 1000TVL, 2000TVL, D1, 960H, 720p, 1080n, 1080h, are the most common formats used to try and convince you that their products are HD where as 1080p, 3MP, 4MP & 5MP, (also known as 2K) can only really be called true HD, and now UHD, (Ultra High Definition) calling itself 8MP.
Please note: ‘Sutterton Surveillance Systems’ does not install anything less than 1080P, (2MP) HD Cameras. Unless they are replacing existing cameras in older systems, such as D1/960H or 720p.
2K, (which in CCTV terms means the image is over 2 million pixels wide)
1080p is what everybody will recognise in one form or another. 1080p is in fact 1920 x 1080, (2,073,600 pixels).
3MP (2052 x 1536 = 3,151,872 pixels) has not really been that popular as it was soon succeeded by the 4MP cameras. However these are still available, again for older systems which had upgraded from the very old D1/960H systems.
4MP is currently the most popular cameras in the 2K market, these are made up with 2560 x 1440, (3,686,400 pixels) which you will have noticed they are not quite 4 million pixels, (but these are the Chinese’s, so I guess they can call them what they want). These have proven popular as customers have not needed to upgrade their TVs/Monitors.
5MP (2560 × 1944 = 4,976,640 pixels) which again is not quite at the 5 million pixels, however they are 1,290,240 pixels more that the 4MP. Note this format has only increased the height of the image by 504 pixels, may or may not make any difference in your own setup.
4K UHD, (which in CCTV terms means the image is about 4 million pixels wide)
8MP you will have noticed they have not bothered with 6 or 7 million pixels, they have gone straight to 8MP. Which is in fact (3840 x 2160 = 8,294,400) also commonly known as 2160 cameras, and shockingly over 8 million pixels. This is without doubt the sharpest, clearest, crispest and so on image from all the ones mentioned, and well worth the cost. However you do have to be sensible about this, and ask yourself is the cost going to outweigh the purpose. For example you would need a 4K TV/Monitor, no point in displaying these images on an outdated TV, (it would be like putting HD cameras through your SCART input).
What’s next, who knows, there will always be somebody working on something better, it’s just what people do. However if there wasn’t, we would still all be using 960H/D1 cameras.