edger_multi: Apply Edges to Images
In kaitlynstrickfaden/edger: Overlay Edges From One Image Onto Other Images

edger_multi

R Documentation

Apply Edges to Images

Description

Find pixel coordinates of edges in defined regions of a reference image. Then, find and recolor the same pixels in new images.

Usage

edger_multi(
  images,
  ref_images = 1,
  roi = NULL,
  th = 20,
  regions = 1,
  shift = c(0, 0),
  rotate = 0,
  color = "red",
  show_image = TRUE,
  process = "sequential",
  cores = 1
)

Arguments

`images`	A vector containing file paths of images to be analyzed. The first image will be the reference image, and edges from the first image will be superimposed onto the other images.
`ref_images`	A numeric indicating in how many reference images you want to search for edges. Default is 1. When greater than 1, the first n images will be used.
`roi`	An argument for delineating the region(s) of interest outside of the main function. Default is NULL and will launch a user interface so the user can draw a region(s) of interest on the image. If "roi" is not NULL, input should be a list containing 4-column data frames with a number of rows equal to regions, with one data frame per ref_images. The data frame needs to contain coordinates to the region(s) of interest in the following order: top-left x, top-left y, bottom-right x, bottom-right y. Note that plotting of images by "imager" starts in the top-left corner.
`th`	A vector of numeric values between 1-100 for the lowest threshold value you want to recolor in each image(a low threshold value captures weaker contrasts). Default is 20.
`regions`	A numeric indicating how many regions to draw. Default is 1.
`shift`	A vector of length 2 containing numerics indicating the amount of shift along the x axis first and the y axis second. Positive values indicate shifts right or up, while negative values indicate shifts left or down. Default is c(0,0).
`rotate`	A numeric indicating the number of degrees to rotate the recolored pixels. Pixels are rotated around the center of the edge pixels. Default is 0.
`color`	A character string for the color of the superimposed object. Default is red.
`show_image`	Logical. Plot images as they are recolored. Default is TRUE.
`process`	One of "sequential" or "parallel" to indicate how images should be processed. Default is sequential. If "parallel", cores will also have to be set.
`cores`	A numeric indicating how many cores to use in parallel processing. Safest is availableCores() - 1. Default is 1.