PUBLIC MARKS with tags tracking & webcam

Analyze human emotions from facial expressions. More direct and automatic than by any other method. Free yourself from black boxes, electrodes, and wiring. Cost-effectively assess the emotional impact of service, product and brand messages on an unprecedented scale.

This is what I got when I combined webcam-based gesture recognition with Hakim El Hattab's reveal.js. It took me a while to write and fine tune the detection algorithms. Even then, the algorithms are only about 80% accurate. You get the gist of it though:  A flick of the hand in mid-air changes the slide. A two hand flick up or down activates the slide overview. Tips and troubleshooting in the slides below (you can still use the keyboard or reveal.js's built in controls)