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Fig. 8.18
Sequence diagram of video retrieval using pseudo-RF on a P2P network
the visual template, and (third) the video nodes. The network's signal propagation
process implements a query expansion method that modifies the query components
according to the initial search result. The modified query is expected to be
effective, as compared to the original query. This process contains intra-peer signal
propagation, which results in a new query which is then sent back to the query peer
in the subsequent inter-peer signal propagation.
8.5.3.1
Intra-Peer Signal Propagation
The adaptation process is implemented by forward-backward signal propagation
between the three layers. The network contains the query node ( v q )
at the first layer,
video template nodes
(
g j ,
j
=
1
,...,
J
)
at the second layer, and video nodes
(
v i ,
i
=
1
at the third layer. The connection between the second and the third layers
are the weight components w ij ,
,...,
I
)
.
As shown in Fig. 8.20 , at the first round of forward signal propagation, some
video nodes at the third layer are activated. The activation level of the i -th video
node, a ( v )
i
i
∈ {
1
,...,
I
},
j
∈{
1
,...,
J
}
is calculated by taking the sum of the signals mesg g j v i . That is:
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