Add helpers for working with image-magick

is_image(x)

image_rasterize2D(x)

image_mask(x, threshold = "50%", canny_geometry = "0x1+10%+30%")

image_explode(x)

image_center(x)

Arguments

x	`image-magick` object
threshold	to feed magick::image_threshold
canny_geometry	to feed magick::image_canny

Details

For image_mask, some "missed" objects can be avoided with large image files or by adjusting threshold and canny_edge radius.

Functions

is_image: tests if is of image-magick class
image_rasterize2D: converts image-magick to 2D raster matrix
image_mask: turn an inmage into a mask
image_explode: turn a multi-object image into multiple image with single object
image_center: returns image center coordinates

Examples

Momit_data("malus/malus1.jpg") %>%
# you dont need magick:: if your library(magick before)
  magick::image_read() -> m0
  m0
#> # A tibble: 1 x 7
#>   format width height colorspace matte filesize density
#>   <chr>  <int>  <int> <chr>      <lgl>    <int> <chr>  
#> 1 JPEG     600    424 sRGB       FALSE    59317 600x600
  m1 <- m0 %>% image_mask()
  m1
#> # A tibble: 1 x 7
#>   format width height colorspace matte filesize density
#>   <chr>  <int>  <int> <chr>      <lgl>    <int> <chr>  
#> 1 JPEG     620    444 Gray       FALSE        0 600x600
  mx <- m1 %>% image_explode

  if (FALSE) {
  mx
  }

  mx[1] %>% image_rasterize2D %>% algo_Conte()
#>          Y   X
#>   [1,]  55 165
#>   [2,]  54 166
#>   [3,]  53 166
#>   [4,]  52 165
#>   [5,]  51 165
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