image = readImage(system.file("tmp_images", "2.jpg", package = "OpenImageR"))
image = rgb_2gray(image)
res_hash = phash(image, hash_size = 6, highfreq_factor = 3, MODE = 'hash')
res_binary = phash(image, hash_size = 6, highfreq_factor = 3, MODE = 'binary')
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