zero_pad: Zero pads an image

In neuroconductor-devel/neurobase: 'Neuroconductor' Base Package with Helper Functions for 'nifti' Objects

Description

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

Usage

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)

neuroconductor-devel/neurobase documentation built on May 6, 2021, 1:48 p.m.