Take the set complement of a window, within its enclosing rectangle.
Usage
complement.owin(w)
Arguments
w
an object of class "owin" describing
a window of observation for a point pattern.
Value
Another object of class "owin"
representing the complement of the window, i.e. the inside
of the window becomes the outside.
Details
If w is a rectangular window this produces an error.
Otherwise, it yields a window object (of class "owin",
see owin.object) representing the set complement
of w inside its enclosing rectangle. For polygonal windows
this is achieved by reversing the sign of each boundary polygon,
while for binary masks it is achieved by negating the pixel values.