Dashmellow
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- Umpteen
As I've mentioned previously in this thread, I had been experimenting with running three cameras in my vehicle. At this point, I now regularly run four cameras - front, rear and both sides with the lateral cameras facing out through the dark tinted rear side windows of my extended cab pick-up truck. On the whole, I am very pleased with the coverage I get because the four cameras provide excellent coverage with a good deal of overlap from all four cameras. Since I am doing this with re-purposed older dash cams, each camera in my particular set-up has a different FOV but the overall angles of coverage actually add up to and capture well over 360 degrees around the vehicle. To keep the explanation simple think of it this way. If, hypothetically, all four cameras had lenses that capture 140 degree coverage, (many capture much more than that these days) the combined FOV coverage would total 560 degrees.
In actual practice this isn't so simple since it depends on the particular vehicle. In my case, because I drive a pick-up truck, the rear camera captures the entire rear bed of the truck and everything to either side of the vehicle. Then the side cameras heavily overlap the coverage from the rear cam along with overlap from the front camera. On the other hand, if I drove, say, a hatchback car, the rear camera would be at the hindmost part of the vehicle and would be less likely to capture footage that overlaps with the side camera's coverage. (but not impossible)
I agree that having the cameras inside the vehicle keeps them secure but in my case only the front camera has the benefit of a windshield wiper. Rain drops and road dirt can be a problem but an occasional squeegee does the trick and even some crap on the glass isn't a deal breaker. Still, I do think a properly designed roof mounted dome of some kind would be the most effective solution but it would need to be designed to blend in aesthetically with the car so that it doesn't look too weird. Based on my longtime experience with weatherproof exterior mounted CCTV cameras I don't believe that not having windshield wipers or defrosters on the cams would be an issue. Hermetically sealed camera housings don't necessarily need defrosters like you do inside a vehicle cab and water drops on the glass are only a very temporary and self resolving problem. This would be especially so in a moving vehicle with air flowing over a domed glass.
In any case, I now feel sort of "naked" if I don't have all four cameras up and running. The side cameras capture all kinds of unexpected and interesting things.
In actual practice this isn't so simple since it depends on the particular vehicle. In my case, because I drive a pick-up truck, the rear camera captures the entire rear bed of the truck and everything to either side of the vehicle. Then the side cameras heavily overlap the coverage from the rear cam along with overlap from the front camera. On the other hand, if I drove, say, a hatchback car, the rear camera would be at the hindmost part of the vehicle and would be less likely to capture footage that overlaps with the side camera's coverage. (but not impossible)
I agree that having the cameras inside the vehicle keeps them secure but in my case only the front camera has the benefit of a windshield wiper. Rain drops and road dirt can be a problem but an occasional squeegee does the trick and even some crap on the glass isn't a deal breaker. Still, I do think a properly designed roof mounted dome of some kind would be the most effective solution but it would need to be designed to blend in aesthetically with the car so that it doesn't look too weird. Based on my longtime experience with weatherproof exterior mounted CCTV cameras I don't believe that not having windshield wipers or defrosters on the cams would be an issue. Hermetically sealed camera housings don't necessarily need defrosters like you do inside a vehicle cab and water drops on the glass are only a very temporary and self resolving problem. This would be especially so in a moving vehicle with air flowing over a domed glass.
In any case, I now feel sort of "naked" if I don't have all four cameras up and running. The side cameras capture all kinds of unexpected and interesting things.