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Multimedia Communications EG 371

Multimedia Communications EG 371. Dr Matt Roach Multimedia retrieval Internet. Multimedia search & retrieval. Video on demand Internet Search engines Online directories Pay per click camping Affiliate marketing. Search engine Relevancy. Subjective

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Multimedia Communications EG 371

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  1. Multimedia CommunicationsEG 371 Dr Matt Roach Multimedia retrieval Internet Multimedia communications EG 371 Dr Matt Roach

  2. Multimedia search & retrieval • Video on demand • Internet • Search engines • Online directories • Pay per click camping • Affiliate marketing Multimedia communications EG 371 Dr Matt Roach

  3. Search engine Relevancy • Subjective • One person's good result is different than another's • Relevancy depends on the task of the user, the context, etc. • Internet searches usually fall into one of four types of tasks • Navigational • get me to a known site • 20-25% of searches • Informational • where a user desires a list of authoritative sites on a topic such as 'breast cancer' • Transactional • looking to buy • Question Answering • 'What's the area code for Swansea • Measuring relevance is expensive and slow • need for human intervention.   • Inktomi, Altavista, Yahoo utilize panels of human editors • measure and fine-tune their search results Multimedia communications EG 371 Dr Matt Roach

  4. Narrow domain / Get context • Google maps • Google images • Froogle • Products and services • Google scholar • Etc. Multimedia communications EG 371 Dr Matt Roach

  5. Keywords phrases Key word density Lexicon of key words Key word inter-relationships Key word placement Headings, link etc. Context of page within the web Outbound in bound links Google rank Change of content Number of visitors Search terms & web pages Multimedia communications EG 371 Dr Matt Roach

  6. Google PageRank • Numerical indication of importance • 1-10 • May be on a log scale? • Links in bound links • PR(A) = (1-d) + d(PR(t1)/C(t1) + ... + PR(tn)/C(tn)) • t1 – tn are page ranks of linking pages to page A • c1 – cn are outbound links on the page linking to page A • D is a normalising factor usually 0.85 Multimedia communications EG 371 Dr Matt Roach

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