In addition, automatic face recognition algorithms/systems are often guided by psychophysics and neural studies on how humans perceive faces. Narayanan Ramanathan, in The Essential Guide to Image Processing, 2009 24.1.3 Theoretical Perspectiveįace recognition is by nature an interdisciplinary research area, involving researchers from pattern recognition, computer vision and graphics, image processing/understanding, statistical computing, and machine learning. Figure 1.19 provides details about MSDP operations. The MSDP speaker periodically sends SAs that include all sources within the own domain of the RP. When the packet is received by the last hop router of the receiver, the last hop router also may join the SPT to the source. The encapsulated data is decapsulated and forwarded down the shared tree of that RP.
If the receiving MSDP peer is an RP, and the RP has a (*, G) entry for the group in the SA (there is an interested receiver), the RP creates an (S, G) state for the source and joins to the SPT for the source. The SA is forwarded by each receiving peer using a modified RPF check, until the SA reaches every MSDP router in the interconnected networks-theoretically the entire multicast Internet. When the RP learns about a new multicast source within its own domain (through the normal PIM register mechanism), the RP encapsulates the first data packet in a Source-Active (SA) message and sends the SA to all MSDP peers. The RP in each domain establishes an MSDP peering session using a TCP connection with the RPs in other domains or with border routers leading to the other domains. PIM-SM is used to forward the traffic between the multicast domains. A useful feature of MSDP is that it allows each domain to maintain an independent RP that does not rely on other domains but enables RPs to forward traffic between domains. When RPs in remote domains hear about the active sources, they can pass on that information to their local receivers and multicast data can then be forwarded between the domains. RPs know about the receivers in their local domain. Multicast Source Distribution Protocol (MSDP) is a mechanism that allows RPs to share information about active sources.
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