simplify.owin

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Approximate a Polygon by a Simpler Polygon

Given a polygonal window, this function finds a simpler polygon that approximates it.

Keywords
spatial, math
Usage
simplify.owin(W, dmin)
Arguments
W
The polygon which is to be simplied. An object of class "owin".
dmin
Numeric value. The smallest permissible length of an edge.
Details

This function simplifies a polygon W by recursively deleting the shortest edge of W until all remaining edges are longer than the specified minimum length dmin, or until there are only three edges left.

The argument W must be a window (object of class "owin"). It should be of type "polygonal". If W is a rectangle, it is returned without alteration.

The simplification algorithm is not yet implemented for binary masks. If W is a mask, an error is generated.

Value

  • Another window (object of class "owin") of type "polygonal".

See Also

owin

Aliases
  • simplify.owin
Examples
data(letterR)
  plot(letterR, col="red")
  plot(simplify.owin(letterR, 0.3), col="blue", add=TRUE)
  data(chorley)
  W <- chorley$window
  plot(W)
  WS <- simplify.owin(W, 2)
  plot(WS, add=TRUE, border="green")
  points(vertices(WS))
Documentation reproduced from package spatstat, version 1.37-0, License: GPL (>= 2)

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