 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Properties
|
|
|
|
• |
It computes the
minimum cost path from the seed to every
|
|
|
node in the
graph. This set of minimum paths is
represented
|
|
as a tree
|
|
|
|
• |
Running time,
with N pixels:
|
|
|
|
– |
O(N2)
time if you use an active list
|
|
|
|
|
|
– |
O(N log N) if you
use an active priority queue (heap)
|
|
|
|
– |
takes fraction
of a second for a typical (640x480) image
|
|
|
|
• |
Once this tree
is computed once, we can extract the optimal
|
|
|
path from any
point to the seed in O(N) time.
|
|
|
|
– |
it runs in real
time as the mouse moves
|
|
|
|
• |
What happens
when the user specifies a new seed?
|
|