Generate R-Captcha — captcha_generate • captcha

Generates a custom captcha image using the magick package. We name this captcha as R-Captcha.

Usage

captcha_generate(
  write_disk = FALSE,
  path = getwd(),
  chars = c(0:9, letters, LETTERS),
  n_chars = 4,
  n_rows = 60,
  n_cols = 120,
  p_rotate = 0.8,
  p_line = 0.8,
  p_stroke = 0.3,
  p_box = 0.3,
  p_implode = 0.2,
  p_oilpaint = 0,
  p_noise = 0.4,
  p_lat = 0
)

Arguments

write_disk: write image to disk? Defaults to FALSE.
path: path to save images. Defaults to current directory.
chars: which chars to generate. Defaults upper/lower case letters and numbers
n_chars: captcha length. Defaults to 4.
n_rows, n_cols: image dimensions. Defaults to 60x120 image.
p_rotate: probability to add rotation. Defaults to 80%.
p_line: probability to add strike through line. Defaults to 80%.
p_stroke: probability to add stroke color. Defaults to 30%.
p_box: probability to add bounding box to text. Defaults to 30%.
p_implode: probability to add imploding effect. Defaults to 20%.
p_oilpaint: probability to add oil paint effect. Defaults to 0.
p_noise: probability to add random noise to image. Defaults to 40%.
p_lat: probability to add LAT algorithm to image. Defaults to 0.

Value

object of class captcha, which is a list containing three elements: image-magick object and the label.

Examples


# must have ghostscript enabled in ImageMagick
# run check_magick_ghostscript() for details.
if (magick::magick_config()$ghostscript) {
  captcha_generate()
  captcha_generate(n_chars = 5)
}