Multimedia database
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Multimedia databases allow storage and querying of various media types including images, video, audio and text. Common applications include repositories for retrieval, presentations with temporal constraints, and collaborative work. Key issues in multimedia databases include modeling content, designing storage and queries, ensuring performance, and representing complex multimedia objects with different media types.
Multimedia database
- 1. Multimedia database provide features that allow users to store and query different types of multimedia information. The following types of multimedia data are available in current systems today: ◦ Images ◦ Graphics ◦ Animations ◦ Video ◦ Text / Document ◦ Audio ◦ Composite or mixed multimedia data Multimedia Database sept 2014 1
- 2. Application may be categorized based on their data management characteristics as follows: ◦ Repository applications: Stored multimedia data for retrieval purpose. Organized into hierarchy of storage level (local disk, tertiary disk, optical disk). ◦ Presentation applications: Delivered multimedia data to temporal constraints. Ex: video and audio. ◦ Collaborative work using multimedia information: Execute a complex design task by merging drawings, fitting subjects to design constraints, and so on. Multimedia Database sept 2014 2
- 3. Multimedia information embrace a the following set of issues: ◦ Modeling: Modeling the structured and contents of data. Design: The conceptual, logical, and physical design. ◦ Storage: Multimedia data on standard disk-like devices presents problems of mapping to device hierarchies, buffering during the input/output operation. Multimedia Database sept 2014 3
- 4. ◦ Queries and retrieval: Multimedia types are retrieved based on containing certain object or activity, it is called content-based retrieval. Ex: video clip where a soccer goal is scored by a certain player. ◦ Performance: DBMS verify the query optimization for multimedia data. performance constraints are determined by the user. Multimedia Database sept 2014 4
- 5. Modeling data content has not been an issue in database models and system. EX: Insurance company’s accident claim report as multimedia object, it includes: (images of the accident, structured insurance forms, audio recordings of the parties involved in the accidents, the text report of thee company’s representative, and other information). Multimedia Database sept 2014 5
- 6. Which data model should be used to represent this data? An How should queries be formulated against this data? For hyperlinks data modeling, the system should take into account different variations. When content based multimedia data is needed, query mechanism access to the link and link associated data. Semantic web: sept 2014 Multimedia Database 6
- 7. 2 approaches.. ◦ Using image processing techniques. ◦ Assigning index terms using manual indexing. Information retrieval is based on 3 indexing schemes Multimedia Database sept 2014 7 Classificatory systems. Keyword-based systems. Entity attribute relationship system.
- 8. Problems in text retrieval ◦ Phrase indexing. ◦ Use of thesaurus. ◦ Resolving ambiguity. Multimedia Database sept 2014 8
- 9. ◦ Documents and records management ◦ Knowledge dissemination ◦ Education and training ◦ Marketing, advertising, entertainment, and travel ◦ Real-time control and monitoring ◦ Commercial system Multimedia Database sept 2014 9