Silence is golden—or perhaps gestures are. At least gestures can fill an awkward silence and control an app that whispers reminders in your earphones.

We have built our first Android app with OpenCV's Java bindings. We have also learned how to use optical flow to track the movement of an object after detection. Thus, we are able to recognize a gesture such as a head moving up and down in a nod.

Our next project deals with motion in three dimensions. We will build a system that estimates changes in distance in order to alert a driver when the car is being followed.