Fingerino

Control the cursor with a webcam. The thumb moves the pointer, flicking the index finger clicks, holding the point drags, two fingers scroll, and a flat-handed swipe switches windows. No hardware beyond the camera already in the laptop.

Most of the work is refusing false positives. A recogniser that fires when you did not mean it is worse than one that misses, so a point resolves only when it ends: short is a click, held is a drag. Every posture test is built from distances to the wrist, so it survives a rotated hand. Releases are debounced separately, with a longer grace once a button is actually down, so one mis-landmarked frame cannot drop a drag halfway.

Cursor feel comes from a One Euro filter. I tuned it against a Fitts’s law harness rather than trusting my impression, because every change feels better for the first two minutes.