Image Analysis
Functions for image calculations and analysis. This part of the package needs more work.
image_compare(image, reference_image, metric = "", fuzz = 0) image_compare_dist(image, reference_image, metric = "", fuzz = 0) image_fft(image)
image |
magick image object returned by |
reference_image |
another image to compare to |
metric |
string with a metric
from metric_types() such as |
fuzz |
relative color distance (value between 0 and 100) to be considered similar in the filling algorithm |
For details see Image++ documentation. Short descriptions:
image_compare calculates a metric by comparing image with a reference image.
image_fft returns Discrete Fourier Transform (DFT) of the image as a magnitude / phase image pair. I wish I knew what this means.
Here image_compare() is vectorized over the first argument and returns the diff image
with the calculated distortion value as an attribute.
out1 <- image_blur(logo, 3)
out2 <- image_oilpaint(logo, 3)
input <- c(logo, out1, out2, logo)
if(magick_config()$version >= "6.8.7"){
diff_img <- image_compare(input, logo, metric = "AE")
attributes(diff_img)
}Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.