update on multi-touch table
thought i would update everyone on the progress so far. i finally got the IR assemblies done. I realized i needed a small fan to cool them down because they can get quite hot (the resistors are rated 1w). i also decided to remove the computer power plugs i was using and replace them with radio shack polarized plugs. they are cheep, easy to use, and haven’t fallen apart yet like those computer plugs did. i plug these into an old 300W computer power supply i had in the basement. these lights also have a small plastic hinge between them and the backing. this allows me to easily change their up/down angle to prevent them from reflecting on the acrylic top.
the IR lights attach to the bottom of the table with velcro. this allows me to adjust the angle of the lights underneath. it’s the simplest thing that could work, and it works wonderfully.
this is a macro shot of the top of the camera. because the top of the fish eye lens is rounded, i can’t cheat and put the IR filter directly on top of the lens. i built the filter support with tiny bits of balsa wood and held it together with some hot glue. i also put some gaffer tape around the exposed sides to keep outside light to a minimum.
here is a shot of the IR lights from above the table
the fiducials show up wonderfully in reactivision.
