The answer depends largely on what cctv cameras you have, your budget and your surveillance objective.
What does HD and UHD Mean?
Let’s start by defining what HD/UHD means, and why it’s important for CCTV.
UHD: Offers four times higher resolution than Full-HD at 3840 x 2160 pixels (Roughly 8 Megapixel)
Full HD: Full HD offers two times higher resolution than HD-Ready systems at a resolution of 1920 x 1080 pixels (Roughly 2 Megapixel)
HD-ready: Offers 1280 x 720-pixel resolution (Roughly 1 Megapixel)
To achieve the design resolution though, the size of your display must support the given resolution. It must allow the specified pixel density to be achieved.
Matching the Display to the Input Image
A UHD TV for instance cannot achieve the same resolution as a 4K TV. The true 4K Display is 4096×2160. Pixels.
The potential pixels are determined by multiplying the horizontal and vertical dimensions of the display.
For e.g. If your image input source is 1920 x 1080 pixels, and your display is 3840 x 2160 pixels. The input source will not provide sufficient pixels to display the image at UHD Resolution.
Another example is In the case where your input source is a UHD camera, and the display is Full-HD. The Full HD display will not produce a large enough image to achieve the UHD Resolution.
Making the Decision About the Right Display
Cameras: If you want to display the full resolution of your camera, then the display size must match the recorded image resolution – I.e the rated resolution of the camera, or the resolution at which you are recording.
If you don’t really need the additional resolution of the camera, for the purpose of evidential recording then using a lower resolution display is perfectly fine.
Budget: If you don’t have the budget, you can still display UHD video on a Full-HD, HD Ready or even a VGA display. You will not be getting the full benefit of the cameras resolution in this case – and might just consider purchasing lower resolution cameras.
Resolution: The pixel density and size of the image
at which you can display your video is important.
The advantages of High Resolution CCTV
Higher Resolution can give you more coverage of a scene than a lower resolution camera.
Higher Resolutions are better able to resolve characters, and fare better at recording vehicle number plates, and package markings.
Higher Resolutions provide greater digital zoom function.
Whether you choose HD/UHD will depend on :
The cameras capacity to produce the relevant image resolution,
The resolution at which your recorder, records and saves the image,
Whether you can afford the necessary resolution,
Whether you actually need the higher resolution for character recognition, wider scene coverage, or will need to zoom in to an image for detail.
Article by Gensix Technology . 26 September 2020
