Summary Multimedia Database

INTRODUCTION 1) Background a) Combine text + graphics b) Visual + audio c) Catalog and index image + efficient storage and delivery

2) 4 Difficulties d) Data type e) Data manipulation f) Data storage g) Data delivery

3) Importance h) Store Image (eg:museum) i) Search and manipulate content

4) Types j) Images k) Audio l) Video m) Document n) Handwritten

5) Application o) GIS,CAD,Face-retrieval,doc imaging, medical db, web

6) Characteristic p) Treat mdb same way as data based

7) 4 Challenges q) Size r) Time s) Semantic Nature of Multimedia t) Operation of individual media

8) 5 Features u) Support diff. multimedia data type v) Handle large no. multimedia obj. w) Hierarchical storage structure & archiving data x) Information-retrieval y) Database capabilities
MULTIMEDIA DATA 1. Multimedia data size
[Size of media data makes storage, processing, transmission and reception of the data very costly] a. Multimedia data acquisition

* Data capture: photo/audio/video * Sampling: convert analog to digital * 8bits = 256 colors * 24bits = 16 million colors b. Dealing with Media Object Size * 2 approaches : store references/reduce size media * SQL:1999 2 data type BLOB & CLOB Lack in (PK, FK ,equality test) * Oracle9i: support 2 LOB
#internal LOB: BLOB & CLOB
#external LOB: BFILE * IBM DB2: BLOB,CLOB,DBLOB(china) c. Reducing Media Object’s Size * Compression algorithm
*remove duplicate information
*abbreviating information * Objective
*Reduce bandwidth/storage
*Decode signal close to original
*Robustness,scalability,extensibility
* 2 stages:
*Predict-estimate redundant & select algorithm