Agree. High MP and shortest focal to get angle and reduce dead zone.
Of course the best choice would be a 180 (3MP) or 360 (5MP) in the middle of a wall, no dead zone with a 1mm focal , but less ppf for sure. I wonder if a 180, with 3MP won't be also a good choice in an angle compared with your FHD
Agree. Which is why we use Computar 1.8-3.6mm varifocal lenses on analog cameras for those applications and have been testing the Theia 1.8-3mm lenses for IP cameras.
I did post a discussion about my observations on the Theia lens on a 720p camera. It has its pluses and minuses - the most blantant minus is that, compared to the Computar, the Theia's dewarping technology tends to make objects near the center of the FOV appear to be farther away than a non-dewarped lens.
The strangest thing is to pan the camera across a scene. As an object goes from the edge of the FOV to the center, it appears to recede. The huge downside is when the camera/lens is used in a corner, as in your example. The way a corner-mounted camera must be aimed (the opposite corner typically being the farthest point from the camera), the Theia's exxageration of center distance puts even less pixels on target in that area than a fisheye lens would.
I wish someone made the equivalent of the Computar in megapixel format without the dewarping. The fisheye effect never bothered us with analog cameras...
This looks bizarre to me. We have 90 degree cameras that cover very well the 2 walls, but the condition is of course that they are mounted completely into the corner, as soon as you them out of the corner the necessary angle increses... If the above left picture the camera is entirely mouinted in the corner, to me it does not have a 90 degree angle..
Depends on the size of the room, available lenses, sensor size, resolution, lighting, mounting height, ceiling height, what you're looking for, and a lot of other things.
There are some pretty easy ways to do calculations.
I've used some "normal lenses" for certain rooms, and super-wide angle lenses with rectolinear correction, both with good results.
Just depends on the situation and your ability to analyze the data before you order parts rather than after.