makelut() - Image Processing

lut = makelut(fun,n) returns
a lookup table for use with bwlookup. 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. Parameterizing Functions, in the MATLAB Mathematics documentation,
explains how to provide additional parameters to the function fun.

Syntax

lut = makelut(fun,n)

Example

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
     1

Output / Return Value

Limitations

Alternatives / See Also

Reference