import_jpg: Extract outline coordinates from multiple .jpg files

Description

This function is used to import outline coordinates and is built around import_jpg1.

Usage

import_jpg(
  jpg.paths = .lf.auto(),
  auto.notcentered = TRUE,
  fun.notcentered = NULL,
  threshold = 0.5
)

Value

a list of matrices of (x; y) coordinates that can be passed to Out

Arguments

jpg.paths: a vector of paths corresponding to the .jpg files to import. If not provided (or NULL), switches to the automatic version. See Details below.
auto.notcentered: logical if TRUE random locations will be used until. one of them is (assumed) to be within the shape (because of a black pixel); if FALSE a locator will be called, and you will have to click on a point within the shape.
fun.notcentered: NULL by default. Is your shapes are not centered and if a random pick of a black pixel is not satisfactory. See import_jpg1 help and examples.
threshold: the threshold value use to binarize the images. Above, pixels are turned to 1, below to 0.

Details

see import_jpg1 for important informations about how the outlines are extracted, and import_Conte for the algorithm itself.

If jpg.paths is not provided (or NULL), you will have to select any .jpg file in the folder that contains all your files. All the outlines should be imported then.

Examples

Run this code

# \donttest{

lf <- list.files('/foo/jpegs', full.names=TRUE)
coo <- import_jpg(lf)
Out(coo)

coo <- import_jpg()
# }