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In-Depth Information
Fig. 8.19
Snapshot of retrieval process using video re-ranking on the P2P network. The
left frame
shows the query interface and the list of peers. The
right frame
shows the retrieval result which is
the videos clips after five iterations
J
j
=
1
mesg
g
j
ₒ
v
i
a
(
v
)
i
=
(8.17)
J
j
=
1
w
qj
w
ij
∑
∑
j
=
1
w
qj
=
(8.18)
J
J
j
=
1
w
ij
∑
where
mesg
g
j
ₒ
v
i
is the message sent from the
j
-th video template node,
g
j
to the
i
-th video node,
v
i
.
After finishing the forward signal propagation, the activation level of all video
nodes,
a
(
v
)
i
I
are the desired ranking of the videos for retrieval. However,
the signal propagation process does not stop here. The activated video nodes will
send the signal backward to the templates nodes at the second layer. This time,
however, a minimum activation threshold is defined such that the video nodes below
this threshold send no signal out. The activation level of the
j
-th template node
during the backward propagation is obtained by:
,
i
=
1
,...,
a
(
g
)
j
a
(
v
)
i
=
∑
i
w
ij
(8.19)
∈
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