Create lookup table for use with
lut = makelut(fun,n)
lut = makelut(fun,n) returns
a lookup table for use with
a function that accepts an n-by-n matrix
of 1's and 0's as input and return a scalar.
be either 2 or 3.
passing all possible 2-by-2 or 3-by-3 neighborhoods to
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
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
lut is returned as a vector of class
Construct a lookup table for 2-by-2 neighborhoods. In this example,
the function passed to
the number of 1's in the neighborhood is 2 or greater, and returns
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