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()orimage_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.
See also
Other image:
_index_,
animation,
attributes(),
color,
composite,
defines,
device,
edges,
editing,
effects(),
fx,
geometry,
morphology,
ocr,
options(),
painting,
segmentation,
transform(),
video
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)
}
#> $class
#> [1] "magick-image"
#>
#> $distortion
#> [1] 0 50455 20580 0
#>