Characteristics of Multimedia Information Retrieval

• Content-based retrieval
  • from pieces of information to the full picture
  • "Who is the author of this music?" or "Where does this picture come from?"
  • "Is there any design like this?"
  • From the viewpoint of subject analysis: A picture is worth a thousand words
  • From the viewpoint of a reference librarian: A word is worth a thousand pictures
• Automatic indexing
  • "Ask not what the country can do for you, ask what you can do for the country"
  • Pieces of information is sometimes more valuable, while such indexing by human is too costly
• similarity matching
  • similar contents may have different presentation
  • data filtering rather than exact matching (data selection)
• browsing and relevance feedback
  • No ideal mathematical model for defining similarity, human feedback is required
  • A MIR query may involve more interaction between human and machine

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