distmap
Distance Map
Compute the distance map of an object, and return it as a pixel image. Generic.
Usage
distmap(X, …)Arguments
- X
Any suitable dataset representing a two-dimensional object, such as a point pattern (object of class
"ppp"), a window (object of class"owin") or a line segment pattern (object of class"psp").- …
Arguments passed to
as.maskto control pixel resolution.
Details
The “distance map” of a set of points \(A\) is the function
\(f\) whose value f(x) is defined for any two-dimensional
location \(x\) as the shortest distance from \(x\) to \(A\).
This function computes the distance map of the set X
and returns the distance map as a pixel image.
This is generic. Methods are provided for
point patterns (distmap.ppp),
line segment patterns (distmap.psp)
and windows (distmap.owin).
Value
A pixel image (object of class "im") whose grey scale values
are the values of the distance map.
See Also
Examples
# NOT RUN {
data(cells)
U <- distmap(cells)
data(letterR)
V <- distmap(letterR)
# }
# NOT RUN {
plot(U)
plot(V)
# }