<s>
In	O
image	B-Algorithm
processing	I-Algorithm
,	O
pixel	B-Algorithm
connectivity	I-Algorithm
is	O
the	O
way	O
in	O
which	O
pixels	B-Algorithm
in	O
2-dimensional	O
(	O
or	O
hypervoxels	B-Algorithm
in	O
n-dimensional	O
)	O
images	O
relate	O
to	O
their	O
neighbors	O
.	O
</s>
<s>
includes	O
the	O
center	O
hypervoxel	B-Algorithm
,	O
which	O
is	O
not	O
included	O
in	O
the	O
connectivity	O
.	O
</s>
<s>
4-connected	O
pixels	B-Algorithm
are	O
neighbors	O
to	O
every	O
pixel	B-Algorithm
that	O
touches	O
one	O
of	O
their	O
edges	O
.	O
</s>
<s>
These	O
pixels	B-Algorithm
are	O
connected	O
horizontally	O
and	O
vertically	O
.	O
</s>
<s>
is	O
connected	O
to	O
the	O
pixel	B-Algorithm
at	O
.	O
</s>
<s>
6-connected	O
pixels	B-Algorithm
are	O
neighbors	O
to	O
every	O
pixel	B-Algorithm
that	O
touches	O
one	O
of	O
their	O
corners	O
(	O
which	O
includes	O
pixels	B-Algorithm
that	O
touch	O
one	O
of	O
their	O
edges	O
)	O
in	O
a	O
hexagonal	O
grid	O
or	O
stretcher	O
bond	O
rectangular	O
grid	O
.	O
</s>
<s>
There	O
are	O
several	O
ways	O
to	O
map	O
hexagonal	O
tiles	O
to	O
integer	O
pixel	B-Algorithm
coordinates	O
.	O
</s>
<s>
With	O
one	O
method	O
,	O
in	O
addition	O
to	O
the	O
4-connected	O
pixels	B-Algorithm
,	O
the	O
two	O
pixels	B-Algorithm
at	O
coordinates	O
and	O
are	O
connected	O
to	O
the	O
pixel	B-Algorithm
at	O
.	O
</s>
<s>
8-connected	B-Algorithm
pixels	B-Algorithm
are	O
neighbors	O
to	O
every	O
pixel	B-Algorithm
that	O
touches	O
one	O
of	O
their	O
edges	O
or	O
corners	O
.	O
</s>
<s>
These	O
pixels	B-Algorithm
are	O
connected	O
horizontally	O
,	O
vertically	O
,	O
and	O
diagonally	O
.	O
</s>
<s>
In	O
addition	O
to	O
4-connected	O
pixels	B-Algorithm
,	O
each	O
pixel	B-Algorithm
with	O
coordinates	O
is	O
connected	O
to	O
the	O
pixel	B-Algorithm
at	O
.	O
</s>
<s>
6-connected	O
pixels	B-Algorithm
are	O
neighbors	O
to	O
every	O
pixel	B-Algorithm
that	O
touches	O
one	O
of	O
their	O
faces	O
.	O
</s>
<s>
These	O
pixels	B-Algorithm
are	O
connected	O
along	O
one	O
of	O
the	O
primary	O
axes	O
.	O
</s>
<s>
Each	O
pixel	B-Algorithm
with	O
coordinates	O
,	O
,	O
or	O
is	O
connected	O
to	O
the	O
pixel	B-Algorithm
at	O
.	O
</s>
<s>
18-connected	O
pixels	B-Algorithm
are	O
neighbors	O
to	O
every	O
pixel	B-Algorithm
that	O
touches	O
one	O
of	O
their	O
faces	O
or	O
edges	O
.	O
</s>
<s>
These	O
pixels	B-Algorithm
are	O
connected	O
along	O
either	O
one	O
or	O
two	O
of	O
the	O
primary	O
axes	O
.	O
</s>
<s>
In	O
addition	O
to	O
6-connected	O
pixels	B-Algorithm
,	O
each	O
pixel	B-Algorithm
with	O
coordinates	O
,	O
,	O
,	O
,	O
,	O
or	O
is	O
connected	O
to	O
the	O
pixel	B-Algorithm
at	O
.	O
</s>
<s>
26-connected	O
pixels	B-Algorithm
are	O
neighbors	O
to	O
every	O
pixel	B-Algorithm
that	O
touches	O
one	O
of	O
their	O
faces	O
,	O
edges	O
,	O
or	O
corners	O
.	O
</s>
<s>
These	O
pixels	B-Algorithm
are	O
connected	O
along	O
either	O
one	O
,	O
two	O
,	O
or	O
all	O
three	O
of	O
the	O
primary	O
axes	O
.	O
</s>
<s>
In	O
addition	O
to	O
18-connected	O
pixels	B-Algorithm
,	O
each	O
pixel	B-Algorithm
with	O
coordinates	O
,	O
,	O
,	O
or	O
is	O
connected	O
to	O
the	O
pixel	B-Algorithm
at	O
.	O
</s>
