I wondered when someone would ask this. Excellent question, and goes to a core reason we developed our “system”. We don’t see this as a camera, but a system.
The short answer is area served. Our system serves a much larger area by being able to put more pixels on a target and a greater distance, thus one “camera” can do the job of dozens. A guard with binoculars versus a guard without binoculars.
First, let me say, I do not mean to disparage any manufacturers products, not Arecont, or Axis, or Avigilon or anyone. They all do quality work as far as I’m concerned. A multi-sensor device has many good and valuable uses such as a high traffic areas. But it’s “pixel on target” range is far less than the system we designed. It just wasn’t designed to do the same job. Also remember, these devices (great majority) have no built in IR illumination when needed.
As you suggested, let’s use the Arecont AV20275DN-08 for the example. Four 5 MP sensors with 8mm lenses. Those lenses have about a 40° horizontal FOV, for a 160° total. First, our system covers about 330° (we can’t look back through our pole), so the Arecont has almost half the “area viewed”, BUT it does this ALL the time, and has 4 times the bandwidth and 4 times the storage.
This is going to come down to the application. We’re going to say that our system serves a whole new category of application, and it’s just not proper to compare the two.
To continue the example, let’s say the goal is to provide 50 pixels per foot of resolution on targets. Not facial recognition quality for sure, but a good, useful picture.
For a 2MP sensor that’s ABOUT 20’ horizontal, for a 5MP sensor that ABOUT 25’.
Doing the isosceles triangle math (FOV) for 50 pixels per foot resolution with a 5MP sensor with ~40° FOV you get an effective distance of ABOUT 40’ from the camera. Sure, you get video of events further than that but its investigative/evidentiary value drops substantially as the distance away grows.
Our system uses a 22X optical zoom PTZ that can readily achieve 50 pixel per foot resolution at 300’.
40’ radius (πR²) X (160/360) =~2,500 sf. 300’R area X (330/360) =~ 250,000 sf. About 100 times more area, 100 times more cameras, installations, bandwidth and storage.
Everyone who’s still reading is screaming BUT the multi-camera system is doing this ALL the time, missing NOTHING. Very true. But nobody (few) would ever buy/operate the multi-camera system in this example.
It comes down to can a PTZ camera(s) be made to pay attention to, and video capture, the vast majority of pertinent human events over a very wide area. Our answer is, in many useful applications, yes.
This is where the newly developed sensors coupled with AI comes in. That’s what we think we’ve done.
If you’re still awake and willing, please read my response to Ross below. Thanks