Database Reference
In-Depth Information
Fig. 8.9 Comparison of
retrieval performance in
terms of retrieval precision as
functions of ( a ) iterations and
( b )clicks
Like most P2P applications, this system applies an application layer protocol,
such that the system can be realized on today's internet without modifying the
underlying network infrastructure. The query packet format that traverses the P2P
network is shown in Fig. 8.10 c. Once the destination peer receives the query and
performs a feature match, it will issue a query reply to the query requester directly.
The query results are in the form of filenames and distances. The actual file transfer
is not part of the protocol, and protocols like HTTP, RTP, with or without encryption,
may be applied depending on the application. Transferring the actual image content
is coupled with the feature descriptor transmission, to eliminate the need to re-
compute the feature descriptors upon receiving a new image. The query search and
query response packet format which travels through the P2P network are shown in
Figs. 8.10 b and d, respectively.
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