Sobel operator
<p>May 03, 2018 07:51 PM</p>
<p>
named for Irwin Sobel. qv.</p>
<p>
dev with Gary Feldman also at SAIL. from talk in 1968.</p>
<p>
edge detection. 3 by 3 matrix.</p>
<p>
approx of the gradient of the image intensity function.</p>
<p>
</p>