What alternatives are there to the pHash open source perceptual hash library? [closed]

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I know you can use pHash from .NET or Java, but I would like a pure .NET (preferably) or Java implementation. Are there any others available? I am interested in the image hashing functionality specifically.

A perceptual hash is a way of creating a numeric hash of images and then being able to compare those hashs to see if the images are similar. It allows for really fast image recognition.

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Here is an Java implementation of pHash for images by Elliot Shepherd.