<s>
An	O
image	B-General_Concept
retrieval	I-General_Concept
system	O
is	O
a	O
computer	O
system	O
used	O
for	O
browsing	O
,	O
searching	O
and	O
retrieving	O
images	O
from	O
a	O
large	O
database	O
of	O
digital	O
images	O
.	O
</s>
<s>
Most	O
traditional	O
and	O
common	O
methods	O
of	O
image	B-General_Concept
retrieval	I-General_Concept
utilize	O
some	O
method	O
of	O
adding	O
metadata	O
such	O
as	O
captioning	O
,	O
keywords	O
,	O
title	O
or	O
descriptions	O
to	O
the	O
images	O
so	O
that	O
retrieval	O
can	O
be	O
performed	O
over	O
the	O
annotation	O
words	O
.	O
</s>
<s>
Manual	O
image	B-Application
annotation	I-Application
is	O
time-consuming	O
,	O
laborious	O
and	O
expensive	O
;	O
to	O
address	O
this	O
,	O
there	O
has	O
been	O
a	O
large	O
amount	O
of	O
research	O
done	O
on	O
automatic	B-Application
image	I-Application
annotation	I-Application
.	O
</s>
<s>
Additionally	O
,	O
the	O
increase	O
in	O
social	O
web	B-Application
applications	I-Application
and	O
the	O
semantic	O
web	O
have	O
inspired	O
the	O
development	O
of	O
several	O
web-based	B-Application
image	B-Application
annotation	I-Application
tools	O
.	O
</s>
<s>
All	O
image	B-General_Concept
retrieval	I-General_Concept
systems	O
as	O
of	O
2021	O
were	O
designed	O
for	O
2D	O
images	O
,	O
not	O
3D	O
ones	O
.	O
</s>
<s>
Image	B-General_Concept
search	I-General_Concept
is	O
a	O
specialized	O
data	O
search	O
used	O
to	O
find	O
images	O
.	O
</s>
<s>
To	O
search	B-General_Concept
for	I-General_Concept
images	I-General_Concept
,	O
a	O
user	O
may	O
provide	O
query	B-Library
terms	O
such	O
as	O
keyword	O
,	O
image	O
file/link	O
,	O
or	O
click	O
on	O
some	O
image	O
,	O
and	O
the	O
system	O
will	O
return	O
images	O
"	O
similar	O
"	O
to	O
the	O
query	B-Library
.	O
</s>
<s>
Image	B-Application
meta	I-Application
search	I-Application
-	O
search	O
of	O
images	O
based	O
on	O
associated	O
metadata	O
such	O
as	O
keywords	O
,	O
text	O
,	O
etc	O
.	O
</s>
<s>
Content-based	B-Application
image	I-Application
retrieval	I-Application
(	O
CBIR	B-Application
)	O
–	O
the	O
application	O
of	O
computer	B-Application
vision	I-Application
to	O
the	O
image	B-General_Concept
retrieval	I-General_Concept
.	O
</s>
<s>
CBIR	B-Application
aims	O
at	O
avoiding	O
the	O
use	O
of	O
textual	O
descriptions	O
and	O
instead	O
retrieves	O
images	O
based	O
on	O
similarities	O
in	O
their	O
contents	O
(	O
textures	O
,	O
colors	O
,	O
shapes	O
etc	O
.	O
)	O
</s>
<s>
to	O
a	O
user-supplied	O
query	B-Library
image	O
or	O
user-specified	O
image	O
features	O
.	O
</s>
<s>
List	B-General_Concept
of	I-General_Concept
CBIR	I-General_Concept
Engines	I-General_Concept
-	O
list	O
of	O
engines	O
which	O
search	B-General_Concept
for	I-General_Concept
images	I-General_Concept
based	O
image	O
visual	O
content	O
such	O
as	O
color	O
,	O
texture	O
,	O
shape/object	O
,	O
etc	O
.	O
</s>
<s>
Image	B-General_Concept
collection	I-General_Concept
exploration	I-General_Concept
-	O
search	O
of	O
images	O
based	O
on	O
the	O
use	O
of	O
novel	O
exploration	O
paradigms	O
.	O
</s>
<s>
It	O
is	O
crucial	O
to	O
understand	O
the	O
scope	O
and	O
nature	O
of	O
image	O
data	O
in	O
order	O
to	O
determine	O
the	O
complexity	O
of	O
image	B-General_Concept
search	I-General_Concept
system	O
design	O
.	O
</s>
<s>
There	O
are	O
evaluation	O
workshops	O
for	O
image	B-General_Concept
retrieval	I-General_Concept
systems	O
aiming	O
to	O
investigate	O
and	O
improve	O
the	O
performance	O
of	O
such	O
systems	O
.	O
</s>
