Summary Multimedia Database

Topics: Content format, Electronic media, Type system Pages: 3 (320 words) Published: March 26, 2013
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
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
c. Reducing Media Object’s Size
* Compression algorithm
*remove duplicate information
*abbreviating information
* Objective
*Reduce bandwidth/storage
*Decode signal close to original
* 2 stages:
*Predict-estimate redundant & select algorithm...
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