18 camera calibration

[mlireland]

Hi,

I have an 18 camera setup which is going to be used for tracking rigid bodies in a 4 x 7.8 x 2 metre volume. All of the cameras are at a height of roughly 2.7 m, but are right at the limits of the volume, rather than at a distance.

I'm having trouble calibrating the cameras at the moment, and I'm getting a pretty large wand error (StdD ~ 3.37). The majority of the cameras are fixed to the walls or a pillar, so it's a bit of a hassle to move them. I have 2 stands carrying 3 cameras each which can be moved fairly easily.

I used MATLAB to work out the camera positions beforehand, but the physical results aren't as good as I'd hoped.

Any advice?

[NaturalPoint - Mike]

Would it be possible to diagram the setup?

What type of cameras are you using, what lenses are on them?

What version of software are you on?

[mlireland]

I'm using version 2.5.0 of Tracking Tools, with the 46 degree FOV V100:R2 cameras.

The cameras are meant to cover the majority of one half of a roughly 8 x 8 metre room, up to a height of at least 2 metres. The room has a pillar in the middle, this is used as the halfway mark. The current camera layout can be seen in the attached link.

Camera Setup

[NaturalPoint - Mike]

I'd probably approach this by taking two cameras off of each side and putting them on the shorter walls, then adjusting the positioning so that they are a bit more equidistant. Lowering a few of them may work as well, so that you are seeing the volume from a high and a low perspective. Start by aiming towards the center of the volume, calibrate, then test. Adjust cameras as necessary to tweak coverage a bit, recalibrate, retest.