makelut - Create lookup table for use with applylut
Syntax
lut = makelut(fun,n)
Description
lut = makelut(fun,n) returns
a lookup table for use with applylut. fun is
a function that accepts an n-by-n matrix
of 1's and 0's as input and return a scalar. n can
be either 2 or 3. makelut creates lut by
passing all possible 2-by-2 or 3-by-3 neighborhoods to fun,
one at a time, and constructing either a 16-element vector (for 2-by-2
neighborhoods) or a 512-element vector (for 3-by-3 neighborhoods).
The vector consists of the output from fun for
each possible neighborhood. fun must be a function
handle.
Class Support
lut is returned as a vector of class double.
Examples
Construct a lookup table for 2-by-2 neighborhoods. In this example,
the function passed to makelut returns TRUE if
the number of 1's in the neighborhood is 2 or greater, and returns FALSE otherwise.
f = @(x) (sum(x(:)) >= 2);
lut = makelut(f,2)
lut =
0
0
0
1
0
1
1
1
0
1
1
1
1
1
1
1See Also
applylut
 | makehdr | | makeresampler |  |
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