Results of Video Processing the Ping-Pong Ball Avalanche Videos

These videos are all compressed using divx4. To download a player for these files see players

More information about how the processing was achieved go to this page

The blue line marks where the computer calculates the edge of the flow to be. The thickness of the line is proportional to the velocity.

The files are mostly a few MB in size.

Click on the X to see the video.

Videos taken from the bottom of the slope

start to k point series 1 start to k point series 2 start to middle middle to end debris
1 10,000 balls X X X X X
2 20,000 balls X X X X X
3 40,000 balls X X X X X
4 80,000 balls X X X X X
5 160,000 balls X X X X X
6 320,000 balls X X X X X

Videos taken from the side of the slope,

distance from the start 31.1m 35.0m 39.0m 43.2m 48.2m 52.7m 57.7m 74.0m 78.0m 85.0m 100.9m 105.9m
10,000 balls X X X X X X X X X X X X
20,000 balls X X X X X X X X X X X X
40,000 balls X X X X X X X X X X X X
80,000 balls X X X X X X X X X X X X
160,000 balls X X X X X X X X X X X X
320,000 balls X X X X X X X X X X X X
Jim McElwaine
Last modified: Fri Aug 9 08:48:45 BST 2002