spatstat (version 1.23-1)

distmap: Distance Map

Description

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.mask to control pixel resolution.

Value

• A pixel image (object of class "im") whose grey scale values are the values of the distance map.

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).

See Also

distmap.ppp, distmap.psp, distmap.owin, distfun

Examples

data(cells)
  U <- distmap(cells)
  data(letterR)
  V <- distmap(letterR)
  plot(U)
  plot(V)