Trajectory Extraction
If
S
is a scene graph containing an object descriptor:
(A, [ (d
1
,r
1
,I
1
), (d
2
,r
2
,I
2
), ... (d
n
,r
n
,I
n
) ])
then
S.trajectory(A)
is the sequence:
[ (d
1
,r
1
), (d
2
,r
2
), ... (d
n
,r
n
) ]
