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perceptual-hash

A DCT-based perceptual hash in J.

See here for background.

Use

load 'phash.ijs'
phash (read_image 'demo-data/frog.jpeg')
0 0 1 1 0 1 0 1 0 1 1 1 1 1 1 1 1 1 0 0 1 0 1 0 1 1 0 0 0 0 1 0 1 0 0 0 0 1 1 1 0 1 1 0 1 1 0 0 0 0 0 1 1 1 0 1 0 0 1 0 1 0 0 0
phash (read_image 'demo-data/frog.png')
0 0 1 1 0 1 0 1 0 1 1 1 1 1 1 1 1 1 0 0 1 0 1 0 1 1 0 0 0 0 1 0 1 0 0 0 0 1 1 1 0 1 1 0 1 1 0 0 0 0 0 1 1 1 0 1 0 0 1 0 1 0 0 0
phash (read_image 'demo-data/cat.png')
0 0 1 1 0 0 0 0 1 1 1 1 1 0 0 0 0 0 1 1 1 0 0 1 1 0 0 1 0 0 0 0 1 1 1 1 1 0 0 1 0 0 1 1 1 1 0 0 1 1 0 1 1 0 0 0 0 1 1 1 1 0 0 1

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