Expands an image — image_expand • pliman

Expands an image towards the left, top, right, or bottom by sampling pixels from the image edge. Users can choose how many pixels (rows or columns) are sampled and how many pixels the expansion will have.

Usage

image_expand(
  img,
  left = NULL,
  top = NULL,
  right = NULL,
  bottom = NULL,
  edge = NULL,
  sample_left = 10,
  sample_top = 10,
  sample_right = 10,
  sample_bottom = 10,
  random = FALSE,
  filter = NULL,
  plot = TRUE
)

Arguments

img: An Image object.
left, top, right, bottom: The number of pixels to expand in the left, top, right, and bottom directions, respectively.
edge: The number of pixels to expand in all directions. This can be used to avoid calling all the above arguments
sample_left, sample_top, sample_right, sample_bottom: The number of pixels to sample from each side. Defaults to 20.
random: Randomly sampling of the edge's pixels? Defaults to FALSE.
filter: Apply a median filter in the sampled pixels? Defaults to FALSE.
plot: Plots the extended image? defaults to FALSE.

Value

An Image object

Examples

if (interactive() && requireNamespace("EBImage")) {
library(pliman)
img <- image_pliman("soybean_touch.jpg")
image_expand(img, left = 200)
image_expand(img, right = 150, bottom = 250, filter = 5)
}