spatstat (version 1.0-1)

as.mask: Pixel Image Approximation of a Window

Description

Obtain a discrete (pixel image) approximation of a given window

Usage

as.mask(w, eps=NULL, dimyx=NULL)

Arguments

w

A window (object of class "owin").

eps

Width and height of a pixel.

dimyx

Two integers giving the pixel array dimensions

Value

• A window (object of class "owin") of type "mask" representing a binary pixel image.

Details

The shape of the window w will be approximated by a binary pixel image. See owin.object for explanation of binary image masks.

The pixel raster will be an $m \times n$ rectangular grid where $m, n$ are given by dimyx[2], dimyx[1] respectively (if the argument dimyx is given) or by the constraint that pixel widths and heights should be approximately eps. If neither eps nor dimyx is given, the default is to set eps equal to 1/100 of the window width or height.

There is no inverse of this function!

See Also

owin.object, as.rectangle,

Examples

library(spatstat)
  w <- owin(c(0,10),c(0,10), poly=list(x=c(1,2,3,2,1), y=c(2,3,4,6,7)))
  plot(w)
  m <- as.mask(w)
  plot(m)