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Perceptual Hash Algorithms in Python or PHP? [closed]

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I've been exposed via StackOverflow to pHash, a C++ perceptual hash library for audio, video, images, and text fingerprinting - recently with preliminary bindings for PHP, C# and Java.

I'm interested in studying these algorithms and I'm wondering if there are any open-source pure Python or PHP implementations of the same / similar algorithm? This would make my life a lot easier.


I have been searching on Google, but not much has come up. Since it seems you want the code for academic purposes, I would suggest:

  • Hit Wikipedia - look up each algorithm and get a feel for how it works

  • Check the pHash site's mailing list - I doubt you are the first person to be curious.

  • Email the authors and ask what sources they used (books, papers, etc.)

  • Use bookstore, library, etc. to find your own sources

I personally find that studying code is very ineffective at teaching algorithms (at first anyway, until you have a feel for the overall process).

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