calculation of the 'dhash' of an image
This function calculates the dhash of an image
dhash(gray_image, hash_size = 8, MODE = "hash", resize = "nearest")
gray_image |
a (2-dimensional) matrix or data frame |
hash_size |
an integer specifying the hash size (should be less than number of rows or columns of the gray_image) |
MODE |
one of 'hash' (returns the hash of the image), 'binary' (returns binary identifier of the image) |
resize |
corresponds to one of 'nearest', 'bilinear' |
The function is a modification of the 'dhash' function of the imagehash package [ please consult the COPYRIGHT file ]. In comparison to average_hash and phash, the dhash algorithm takes into consideration the difference between adjacent pixels.
either a hash-string or a binary vector
image = readImage(system.file("tmp_images", "3.jpeg", package = "OpenImageR"))
image = rgb_2gray(image)
res_hash = dhash(image, hash_size = 8, MODE = 'hash')
res_binary = dhash(image, hash_size = 8, MODE = 'binary')Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.