Structured Light sensor (SLS) cameras work by projecting invisible infrared laser gris over a wide field of view. The cameras sensors calculate the distance between the infrared dots to build a 3 dimensional model of its visible field. These cameras are different from typical cameras in that light and color are non-factors in what you will see displayed, changes in movement is what the SLS is made to track as this technology was made originally for X-Box Kinect. To learn more about the SLS camera click here.
GhostTube is a free app that uses SLS technology. Click here to learn more about GhostTube.