<s>
Irwin	B-Algorithm
Sobel	I-Algorithm
(	O
born	O
September	O
12	O
,	O
1940	O
)	O
is	O
a	O
scientist	O
and	O
researcher	O
in	O
digital	O
image	O
processing	O
.	O
</s>
<s>
Irwin	B-Algorithm
Sobel	I-Algorithm
was	O
born	O
in	O
New	O
York	O
City	O
.	O
</s>
<s>
In	O
1968	O
,	O
Sobel	O
gave	O
a	O
talk	O
entitled	O
"	O
An	O
Isotropic	O
3x3	O
Image	O
Gradient	O
Operator	O
"	O
at	O
SAIL	O
;	O
this	O
method	O
became	O
known	O
as	O
the	O
Sobel	B-Algorithm
operator	I-Algorithm
.	O
</s>
<s>
It	O
should	O
more	O
appropriately	O
be	O
called	O
the	O
Sobel	B-Algorithm
–	I-Algorithm
Feldman	I-Algorithm
operator	I-Algorithm
since	O
it	O
was	O
developed	O
jointly	O
with	O
a	O
colleague	O
,	O
Gary	O
Feldman	O
,	O
also	O
at	O
SAIL	O
.	O
</s>
