19
Cross-correlation filtering
Let’s
write this down as an equation. Assume
the averaging window is (2k+1)x(2k+1):
We can generalize this idea by
allowing different weights for different neighboring
pixels:
This is called a cross-correlation
operation and
written:
written:
H is called the “filter,” “kernel,”
or “mask.”
The above allows negative
filter indices. When you
implement need to use: H[u+k,v+k] instead
of H[u,v]