Maybe camera is just the way to go then. There's Kinect, of course, but Intel is getting into the act as well: http://click.intel.com/intelsdk/Intel_Developer_K

Maybe camera is just the way to go then. There's Kinect, of course, but Intel is getting into the act as well: http://click.intel.com/intelsdk/Intel_Developer_Kit-0-C92.aspx http://click.intel.com/intelsdk/Intel_Developer_Kit-0-C92.as... Video demos here: http://software.intel.com/en-us/vcsource/tools/perceptual-computing-sdk http://software.intel.com/en-us/vcsource/tools/perceptual-co...