Zero pads an image — zero

This function zero pads an image by a certain number of dimensions, usually for convolution

zero_pad(img, kdim, invert = FALSE, pad_value = 0, ...)

Arguments

img	Array or class nifti
kdim	Dimensions of kernel
invert	(logical) If `FALSE`, does zero padding. If `TRUE`, reverses the process.
pad_value	Value to pad the image with. May use other values, such as -1024 for CT data
...	Options to `copyNIfTIHeader`

Value

Object of class nifti

Examples

kdim = c(3,3,5)
img = array(rnorm(30*30*36), dim = c(30, 30, 36))
pad = zero_pad(img, kdim)
back = zero_pad(pad, kdim, invert=TRUE)
all.equal(back, img)
#> [1] TRUE