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Research and Implementation of P2P multimedia document search system

Author: Fang
Tutor: YeDeJian
School: Fudan University
Course: Computer Software and Theory
Keywords: Peer-to-peer network Similarity search MPEG-7 standard
CLC: TP391.3
Type: Master's thesis
Year: 2009
Downloads: 74
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Abstract


With the development of network communication technology and storage technology , multimedia information because of its rich content , performance and intuitive, the main way for the expression of human information . How achieve effective media information retrieval and access vast amounts of data , which is a hot issue in recent years, domestic and foreign research . Media file search technology does not need to understand and describe the information to the media , to provide users with an intuitive , flexible and human-computer interaction , is the development trend of the future . P2P network non - centralized structure gives more power to the user , provide a completely new way to search for media search and broader application environment . P2P network does not yet support feature-based search is still mainly based on the file ID ( hash value) and file keyword search . The reason is as follows: On the one hand , based on the feature search using the M-Chord structure search technology , characterization must be in accordance with the semantics are mapped to one-dimensional linear space [ 1 ] , the actual situation is difficult to generally applicable ; another On the one hand , if the unstructured search technology , the resources the dispersed and disturbance characteristics of P2P network , it is bound to increase access and comparative characterization overhead . To solve this problem , this article will be unstructured specifically for MPEG-7 multimedia features of distributed search algorithm SWIM [2] [3] [4] (Small World Index Method) transplant from static distributed environment to dynamic P2P the environment and for the SWIM algorithm performance dropped in P2P disturbance environment , Kademlia [2] algorithm in conjunction to form SWAD (SWIM-Kademlia) algorithm with dynamic update mechanism . The algorithm has the following advantages : broad support for MPEG-7 multimedia characterization ; unstructured way of organizing P2P networks , flexible query ; local greedy search algorithm to replace the traditional flooding , reduce the search overhead ; able to adapt to P2P disturbance characteristics of the network , frequent nodes join and leave the environment , to maintain stable performance . In addition, we also build a test system , the test as well as the actual image search in the 4000 scale node P2P simulation environment , test results showed high accuracy rate , stability , and image search results in line with the subjective human visual perception .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Retrieval machine
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