Documenting progress for a current project, using optical flow analysis to enable a gestural interface & navigate on-screen content both 2D and 3D.

The video analysis requires only a very small (here 160 x 120) capture size and is fairly tolerant to noise. Each frame is recursively analysed in blocks of 30x30 pixels (variable) which are displaced by a certain amount (also adaptable) and then checked for matches in the previous frame. The resulting flow field is displayed and summed to compute the average direction and amount of movement. All calculations and updates to the flow field use threshold & low pass filters to reduce jitter.