Image Processing for Granular Flows
See Players for how to
view the AVI files on this page
Algorithm
I have developed an algorithm and software for processing images
from granular flows and avalanches.
This paper describes how the algorithm works
The software processing is mostly done in MATLAB with some
function also written in c. I am happy to give the software to
anyone who is interested. Please contact me.
Chute Experiments at SLF, Davos, Switzerland
These experiments were carried out with snow and polystyrene
balls.
the results
Miyanomori Ping-Pong Ball Avalanches
The results of processing videos from the Miyanomori ping-pong
ball avalanche experiments can be seen here
Ryggfonn
Ryggfonn is an avalanche test site in Norway operated by
NGI ( Norwegian Geotechnical
Institute). They have very kindly made some avalanche footage
available.
The strong shadows, low contrast, lack of colour and noise in
this video make it a difficult task to locate the front. Never
the less the algorithm works well.
The original video
The blue line marks the
calculated front
Lautaret
This video of an avalanche from the French test site in Col du
Lautaret was very kindly made available by Mohammed Naim of
ETNA .
The analysis of this avalanche is still being worked on. There are
problems with compression artifacts and the small size of the
picture also reduces quality.
The original video
The blue line marks the calculated front
Jim McElwaine
Last modified: Fri Aug 22 10:32:43 BST 2003