<s>
Google	B-Application
Images	I-Application
(	O
previously	O
Google	B-Application
Image	I-Application
Search	I-Application
)	O
is	O
a	O
search	B-Application
engine	I-Application
owned	O
by	O
Google	B-Application
that	O
allows	O
users	O
to	O
search	O
the	O
World	O
Wide	O
Web	O
for	O
images	O
.	O
</s>
<s>
In	O
2011	O
,	O
reverse	B-General_Concept
image	I-General_Concept
search	I-General_Concept
functionality	O
was	O
added	O
.	O
</s>
<s>
In	O
2000	O
,	O
Google	B-Application
Search	I-Application
results	O
were	O
limited	O
to	O
simple	O
pages	O
of	O
text	O
with	O
links	O
.	O
</s>
<s>
Google	B-Application
's	I-Application
developers	O
worked	O
on	O
developing	O
this	O
further	O
,	O
and	O
they	O
realized	O
that	O
an	O
image	B-General_Concept
search	I-General_Concept
tool	O
was	O
required	O
to	O
answer	O
"	O
the	O
most	O
popular	O
search	O
query	O
"	O
they	O
had	O
seen	O
to	O
date	O
:	O
the	O
green	O
Versace	O
dress	O
of	O
Jennifer	O
Lopez	O
worn	O
in	O
February	O
2000	O
.	O
</s>
<s>
Google	B-Application
paired	O
a	O
recently	O
hired	O
engineer	O
Huican	O
Zhu	O
with	O
product	O
manager	O
Susan	O
Wojcicki	O
(	O
now	O
the	O
former	O
CEO	O
of	O
YouTube	B-General_Concept
)	O
to	O
build	O
the	O
feature	O
,	O
and	O
they	O
launched	O
Google	B-Application
Image	I-Application
Search	I-Application
in	O
July	O
2001	O
.	O
</s>
<s>
That	O
year	O
,	O
250	O
million	O
images	O
were	O
indexed	O
in	O
Image	B-General_Concept
Search	I-General_Concept
.	O
</s>
<s>
In	O
January	O
2007	O
,	O
Google	B-Application
updated	O
the	O
interface	O
for	O
the	O
image	B-General_Concept
search	I-General_Concept
,	O
where	O
information	O
about	O
an	O
image	O
,	O
such	O
as	O
resolution	O
and	O
URL	O
,	O
was	O
hidden	O
until	O
the	O
user	O
moved	O
the	O
mouseover	O
its	O
thumbnail	O
.	O
</s>
<s>
On	O
October	O
27	O
,	O
2009	O
,	O
Google	B-Application
Images	I-Application
added	O
a	O
feature	O
to	O
its	O
image	B-General_Concept
search	I-General_Concept
that	O
can	O
be	O
used	O
to	O
find	O
similar	O
images	O
.	O
</s>
<s>
On	O
July	O
20	O
,	O
2010	O
,	O
Google	B-Application
made	O
another	O
update	O
to	O
the	O
interface	O
of	O
Google	B-Application
Images	I-Application
,	O
which	O
hid	O
image	O
details	O
until	O
mouseover	O
.	O
</s>
<s>
In	O
May	O
2011	O
,	O
Google	B-Application
introduced	O
a	O
sort	O
by	O
subject	O
feature	O
for	O
a	O
visual	O
category	O
scheme	O
overview	O
of	O
a	O
search	O
query	O
.	O
</s>
<s>
In	O
June	O
2011	O
,	O
Google	B-Application
Images	I-Application
added	O
a	O
"	O
Search	B-General_Concept
by	I-General_Concept
Image	I-General_Concept
"	O
feature	O
which	O
allowed	O
for	O
reverse	B-General_Concept
image	I-General_Concept
searches	I-General_Concept
directly	O
in	O
the	O
image	O
search-bar	O
without	O
third-party	O
add-ons	O
.	O
</s>
<s>
On	O
December	O
11	O
,	O
2012	O
,	O
Google	B-Application
Images	I-Application
 '	O
search	B-Application
engine	I-Application
algorithm	O
was	O
changed	O
once	O
again	O
,	O
in	O
the	O
hopes	O
of	O
preventing	O
pornographic	O
images	O
from	O
appearing	O
when	O
non-pornographic	O
search	O
terms	O
were	O
used	O
.	O
</s>
<s>
According	O
to	O
Google	B-Application
,	O
pornographic	O
images	O
would	O
still	O
appear	O
as	O
long	O
as	O
the	O
term	O
searched	O
for	O
was	O
specifically	O
pornographic	O
;	O
otherwise	O
,	O
they	O
would	O
not	O
appear	O
.	O
</s>
<s>
While	O
Google	B-Application
stated	O
explicitly	O
that	O
they	O
were	O
"	O
not	O
censoring	O
any	O
adult	O
content	O
"	O
,	O
it	O
was	O
immediately	O
noted	O
that	O
even	O
when	O
entering	O
terms	O
such	O
as	O
or	O
"	O
Breast	O
,	O
"	O
no	O
explicit	O
results	O
were	O
shown	O
.	O
</s>
<s>
The	O
"	O
Search	B-General_Concept
by	I-General_Concept
image	I-General_Concept
"	O
button	O
has	O
also	O
been	O
downplayed	O
,	O
as	O
reverse	B-General_Concept
image	I-General_Concept
search	I-General_Concept
can	O
be	O
used	O
to	O
find	O
higher-resolution	O
copies	O
of	O
copyrighted	O
images	O
.	O
</s>
<s>
Google	B-Application
also	O
agreed	O
to	O
make	O
the	O
copyright	O
disclaimer	O
within	O
the	O
interface	O
more	O
prominent	O
.	O
</s>
<s>
On	O
August	O
6	O
,	O
2019	O
,	O
the	O
ability	O
to	O
filter	O
images	O
by	O
their	O
image	B-Algorithm
resolutions	I-Algorithm
was	O
removed	O
,	O
as	O
well	O
as	O
"	O
larger	O
than	O
"	O
,	O
"	O
face	O
"	O
,	O
and	O
"	O
full	O
color	O
"	O
filters	O
.	O
</s>
<s>
The	O
relevancy	O
of	O
search	B-Application
results	I-Application
has	O
been	O
examined	O
.	O
</s>
<s>
Google	B-Application
Images	I-Application
has	O
a	O
Search	B-General_Concept
by	I-General_Concept
Image	I-General_Concept
feature	O
for	O
performing	O
reverse	B-General_Concept
image	I-General_Concept
searches	I-General_Concept
.	O
</s>
<s>
Unlike	O
traditional	O
image	B-General_Concept
retrieval	I-General_Concept
,	O
this	O
feature	O
removes	O
the	O
need	O
to	O
type	O
in	O
keywords	O
and	O
terms	O
into	O
the	B-Application
Google	I-Application
search	O
box	O
.	O
</s>
<s>
Images	O
on	O
Google	B-Application
may	O
take	O
anything	O
between	O
2-30	O
days	O
to	O
index	O
if	O
they	O
are	O
properly	O
formatted	O
.	O
</s>
<s>
The	O
precision	O
of	O
Search	B-General_Concept
by	I-General_Concept
Image	I-General_Concept
's	O
results	O
is	O
higher	O
if	O
the	O
search	O
image	O
is	O
more	O
popular	O
.	O
</s>
<s>
Additionally	O
,	O
Google	B-Application
Search	I-Application
by	O
Image	O
offers	O
a	O
"	O
best	O
guess	O
for	O
this	O
image	O
"	O
based	O
on	O
the	O
descriptive	O
metadata	O
of	O
the	O
results	O
.	O
</s>
<s>
In	O
2022	O
the	O
feature	O
was	O
replaced	O
by	O
Google	B-General_Concept
Lens	I-General_Concept
as	O
the	O
default	O
visual	O
search	O
method	O
on	O
Google	B-Application
,	O
and	O
the	O
Search	B-General_Concept
by	I-General_Concept
Image	I-General_Concept
function	O
remains	O
available	O
within	O
Google	B-General_Concept
Lens	I-General_Concept
.	O
</s>
<s>
The	O
general	O
steps	O
that	O
Search	B-General_Concept
by	I-General_Concept
Image	I-General_Concept
takes	O
to	O
get	O
from	O
a	O
submitted	O
image	O
to	O
returned	O
search	B-Application
results	I-Application
are	O
as	O
follows	O
:	O
</s>
<s>
Match	O
image	O
:	O
The	O
query	O
is	O
matched	O
against	O
the	O
images	O
in	O
Google	B-Application
's	I-Application
back	B-Architecture
end	I-Architecture
.	O
</s>
<s>
Return	O
results	O
:	O
Google	B-Application
's	I-Application
search	O
and	O
match	O
algorithms	O
return	O
matching	O
and	O
visually	O
similar	O
images	O
as	O
results	O
to	O
the	O
user	O
.	O
</s>
