analysis function

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)

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: relative color distance (value between 0 and 100) 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.

Examples

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)
}

See Also

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