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Thanks Laurent, that was what i was looking. Converting the values to Hex was the trick to obtain same size strings, I '

I 'm trying to compute the perceptual hash for an image (Using for example the phash algorithm). I want to compute and save the hash in a database for future comparissons.

The compute method from the PHashImpl class set an cv::OutputArray with the result of the computation (the hash). Is it posible to convert it into a alphanumeric of numeric representation of the hash?

Like: image -> phash_algrithm -> 8a0303f6df3ec8cd

Am i thinking in the right way or my limited knowledge at the moment of the OpenCv is leading me to the wrong path?

Thanks for your answer Laurent. Do you mean like for example looping through the pixel and transform the values to some

How to obtain the hash representation from the image_hash module I 'm trying to compute the perceptual hash for an image