captcha_generate: Generate R-Captcha

In decryptr/captcha: Solve Text on Image Computer Vision Challenges

Generate R-Captcha

Description

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)
}

decryptr/captcha documentation built on April 15, 2023, 12:42 a.m.