It doesn't really make that assumption unless you assume simple linear extrapolation. It wouldn't be easy but I expect a decent modeling and extrapolation sche

It doesn't really make that assumption unless you assume simple linear extrapolation. It wouldn't be easy but I expect a decent modeling and extrapolation scheme could be devised. I don't think it matters much though, as a simple count of cameras isn't so useful (especially with them being so cheap now). How many cameras is less important than what they cover and what they are connected to.