This work was presented at the 1995 International Symposium on Circuits and Systems in Seattle, WA. It is also currently under review for publication in the IEEE Transactions on Circuits and Systems for Video Technology.
Shown here is a single frame of of the output sequence corresponding to the above input frame. The filter is tuned to enhance objects moving at the speed and direction of the downward-moving chairs. As shown, the downward-moving chair in the center of the image is clearly visible. The upward-moving chairs have been rejected and so have the skiers. This is more clearly evident if you look at the output MPEG sequence (124K, 160x120, 100 frames).