<s>
A	O
Multimedia	B-General_Concept
database	I-General_Concept
(	O
MMDB	O
)	O
is	O
a	O
collection	O
of	O
related	O
for	O
multimedia	O
data	B-General_Concept
.	O
</s>
<s>
The	O
multimedia	O
data	B-General_Concept
include	O
one	O
or	O
more	O
primary	O
media	O
data	B-General_Concept
types	O
such	O
as	O
text	O
,	O
images	O
,	O
graphic	O
objects	O
(	O
including	O
drawings	O
,	O
sketches	O
and	O
illustrations	O
)	O
animation	O
sequences	O
,	O
audio	O
and	O
video	O
.	O
</s>
<s>
A	O
Multimedia	B-General_Concept
Database	I-General_Concept
Management	O
System	O
(	O
MMDBMS	O
)	O
is	O
a	O
framework	B-Architecture
that	O
manages	O
different	O
types	O
of	O
data	B-General_Concept
potentially	O
represented	O
in	O
a	O
wide	O
diversity	O
of	O
formats	O
on	O
a	O
wide	O
array	O
of	O
media	O
sources	O
.	O
</s>
<s>
It	O
provides	O
support	O
for	O
multimedia	O
data	B-General_Concept
types	O
,	O
and	O
facilitate	O
for	O
creation	O
,	O
storage	O
,	O
access	O
,	O
query	B-Library
and	O
control	O
of	O
a	O
multimedia	B-General_Concept
database	I-General_Concept
.	O
</s>
<s>
A	O
Multimedia	B-General_Concept
Database	I-General_Concept
(	O
MMDB	O
)	O
hosts	O
one	O
or	O
more	O
multimedia	O
data	B-General_Concept
types	O
(	O
i.e.	O
</s>
<s>
These	O
data	B-General_Concept
types	O
are	O
broadly	O
categorized	O
into	O
three	O
classes	O
:	O
</s>
<s>
Additionally	O
,	O
a	O
Multimedia	B-General_Concept
Database	I-General_Concept
(	O
MMDB	O
)	O
needs	O
to	O
manage	O
additional	O
information	O
pertaining	O
to	O
the	O
actual	O
multimedia	O
data	B-General_Concept
.	O
</s>
<s>
Media	O
data	B-General_Concept
:	O
the	O
actual	O
data	B-General_Concept
representing	O
an	O
object	O
.	O
</s>
<s>
Media	O
format	O
data	B-General_Concept
:	O
information	O
about	O
the	O
format	O
of	O
the	O
media	O
data	B-General_Concept
after	O
it	O
goes	O
through	O
the	O
acquisition	O
,	O
processing	O
,	O
and	O
encoding	O
phases	O
.	O
</s>
<s>
Media	O
keyword	O
data	B-General_Concept
:	O
the	O
keyword	O
descriptions	O
,	O
usually	O
relating	O
to	O
the	O
generation	O
of	O
the	O
media	O
data	B-General_Concept
.	O
</s>
<s>
Media	O
feature	O
data	B-General_Concept
:	O
content	O
dependent	O
data	B-General_Concept
such	O
as	O
contain	O
information	O
about	O
the	O
distribution	O
of	O
colours	O
,	O
the	O
kinds	O
of	O
textures	O
and	O
the	O
different	O
shapes	O
present	O
in	O
an	O
image	O
.	O
</s>
<s>
The	O
last	O
three	O
types	O
are	O
called	O
metadata	O
as	O
they	O
describe	O
several	O
different	O
aspects	O
of	O
the	O
media	O
data	B-General_Concept
.	O
</s>
<s>
The	O
media	O
keyword	O
data	B-General_Concept
and	O
media	O
feature	O
data	B-General_Concept
are	O
used	O
as	O
indices	O
for	O
searching	O
purpose	O
.	O
</s>
<s>
The	O
media	O
format	O
data	B-General_Concept
is	O
used	O
to	O
present	O
the	O
retrieved	O
information	O
.	O
</s>
<s>
Like	O
the	O
traditional	O
databases	B-Application
,	O
Multimedia	B-General_Concept
databases	I-General_Concept
should	O
address	O
the	O
following	O
requirements	O
:	O
</s>
<s>
Multimedia	B-General_Concept
databases	I-General_Concept
should	O
have	O
the	O
ability	O
to	O
uniformly	O
query	B-Library
data	B-General_Concept
(	O
media	O
data	B-General_Concept
,	O
textual	O
data	B-General_Concept
)	O
represented	O
in	O
different	O
formats	O
and	O
have	O
the	O
ability	O
to	O
simultaneously	O
query	B-Library
different	O
media	O
sources	O
and	O
conduct	O
classical	O
database	O
operations	O
across	O
them	O
.	O
</s>
<s>
They	O
should	O
have	O
the	O
ability	O
to	O
take	O
the	O
response	O
generated	O
by	O
a	O
query	B-Library
and	O
develop	O
a	O
presentation	O
of	O
that	O
response	O
in	O
terms	O
of	O
audio-visual	O
media	O
and	O
have	O
the	O
ability	O
to	O
deliver	O
this	O
presentation	O
.	O
</s>
<s>
Multimedia	O
data	B-General_Concept
consists	O
of	O
a	O
variety	O
of	O
media	O
formats	O
or	O
file	O
representations	O
including	O
TIFF	O
,	O
BMP	B-Device
,	O
PPT	O
,	O
IVUE	B-Application
,	O
FPX	O
,	O
JPEG	O
,	O
MPEG	O
,	O
AVI	O
,	O
MID	O
,	O
WAV	O
,	O
DOC	B-Operating_System
,	O
GIF	O
,	O
EPS	B-Language
,	O
PNG	O
,	O
etc	O
.	O
</s>
<s>
Because	O
of	O
restrictions	O
on	O
the	O
conversion	O
from	O
one	O
format	O
to	O
the	O
other	O
,	O
the	O
use	O
of	O
the	O
data	B-General_Concept
in	O
a	O
specific	O
format	O
has	O
been	O
limited	O
as	O
well	O
.	O
</s>
<s>
Usually	O
,	O
the	O
data	B-General_Concept
size	O
of	O
multimedia	O
is	O
large	O
such	O
as	O
video	O
;	O
therefore	O
,	O
multimedia	O
data	B-General_Concept
often	O
require	O
a	O
large	O
storage	O
.	O
</s>
<s>
Multimedia	B-General_Concept
database	I-General_Concept
consume	O
a	O
lot	O
of	O
processing	O
time	O
,	O
as	O
well	O
as	O
bandwidth	O
.	O
</s>
<s>
Some	O
multimedia	O
data	B-General_Concept
types	O
such	O
as	O
video	O
,	O
audio	O
,	O
and	O
animation	O
sequences	O
have	O
temporal	O
requirements	O
that	O
have	O
implications	O
on	O
their	O
storage	O
,	O
manipulation	O
and	O
presentation	O
,	O
but	O
images	O
,	O
video	O
and	O
graphics	O
data	B-General_Concept
have	O
special	O
constraints	O
in	O
terms	O
of	O
their	O
content	O
.	O
</s>
<s>
Examples	O
of	O
multimedia	B-General_Concept
database	I-General_Concept
application	O
areas	O
:	O
</s>
