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In this demo we show the UPM as a parallel parts sorter: 4 blue and 4 red poker chips are scattered randomly on the UPM's horizontal plate as shown below: The idea is to sort the red chips to the right and the blue chips to the left, in parallel. This illustrates how the UPM's 3-dof's are sufficient to manipulate a system with a much larger -- 16 in this case -- # of dof's. Using the overhead (color) camera, each poker chip is assigned to a color group -- "red" or "blue". Sorting is accomplished via a round-robin procedure: for each part on the table, displace it a small amount in the appropriate direction: left for blue, right for red. A special motion primitive is used which allows a single part to be displaced while keeping all others immobile. The round-robin procedure is repeated until all parts reach their respective sides (use vision to correct for errors). Below a sequence of snapshots of the sorting operation is shown, read from left-to-right, top-to-bottom: A video of this interesting motion is available both in MPEG and RealVideo8 350kbps and 34kbps formats. |
© 2000 Dan S. Reznik, <dreznik@cs.berkeley.edu> |