Find perimeter of objects in binary images.
Values from the matrix bw are considered part of an object perimeter if their value is non-zero and is connected to at least one zero-valued element, or to the outside of bw.
Element connectivity conn, to define the size of objects, can be specified with a numeric scalar (number of elements in the neighborhood):
for 2 dimensional matrices;
for 3 dimensional matrices;
or with a binary matrix representing a connectivity array. Defaults to
conndef (ndims (bw), "minimal") which is equivalent to
conn of 4 and 6 for 2 and 3 dimensional matrices respectively.
See also: bwarea, bwboundaries, imerode, mmgrad.
Package: image