padimage

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Pad the Border of a Pixel Image

Fills the border of a pixel image with a given value or values, or extends a pixel image to fill a larger window.

Keywords
manip, spatial
Usage
padimage(X, value=NA, n=1, W=NULL)
Arguments
X
Pixel image (object of class "im").
value
Single value to be placed around the border of X.
n
Width of border, in pixels. See Details.
W
Window for the resulting image. Incompatible with n.
Details

The image X will be expanded by a margin of n pixels, or extended to fill the window W, with new pixel values set to value.

The argument value should be a single value (a vector of length 1), normally a value of the same type as the pixel values of X. It may be NA. Alternatively if X is a factor-valued image, value can be one of the levels of X.

If n is given, it may be a single number, specifying the width of the border in pixels. Alternatively it may be a vector of length 2 or 4. It will be replicated to length 4, and these numbers will be interpreted as the border widths for the (left, right, top, bottom) margins respectively.

Alternatively if W is given, the image will be extended to the window W.

Value

  • Another object of class "im", of the same type as X.

See Also

im

Aliases
  • padimage
Examples
Z <- setcov(owin())
 plot(padimage(Z, 1, 10))
Documentation reproduced from package spatstat, version 1.42-2, License: GPL (>= 2)

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