Traditional surveillance systems typically detect pixel changes, leading to false alerts due to varying lighting, changing elevator numbers, and other minor shifts. However, most surveillance needs focus on the movement of specific objects.
4K video offers unparalleled clarity and detail, but at a cost. If you have dozens of surveillance cameras installed, recording all of them in 4K can quickly become impractical due to storage constraints. For multiple cameras, simply multiplying the storage requirement for one camera by the number of cameras will give you an estimate of the storage needed.