image_expand: Expands an image

In pliman: Tools for Plant Image Analysis

Expands an image

Description

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

library(pliman)
img <- image_pliman("soybean_touch.jpg")
image_expand(img, left = 200)
image_expand(img, right = 150, bottom = 250, filter = 5)

pliman documentation built on Oct. 15, 2023, 1:06 a.m.