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magick (version 2.0)

analysis: Image Analysis

Description

Functions for image calculations and analysis. This part of the package needs more work.

Usage

image_compare(image, reference_image, metric = "", fuzz = 0)
image_compare_dist(image, reference_image, metric = "", fuzz = 0)
image_fft(image)

Arguments

image

magick image object returned by image_read() or image_graph()

reference_image

another image to compare to

metric

string with a metric from metric_types() such as "AE" or "phash"

fuzz

Fuzz percentage: value between 0 and 100. Relative distance between colors to be considered similar in the filling algorithm.

Details

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.

See Also

Other image: _index_, animation, attributes, color, composite, device, edges, editing, effects, fx, geometry, morphology, ocr, options, painting, segmentation, transform, video

Examples

Run this code
# NOT RUN {
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)
}
# }

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