Question

Is there a way to recognize an image or something like a fingerprint or a very complex image on php?

Do you know a library or anything to recognize images like this?

Answer 1

imageMagick : imagMagick Doc

<?php

$image1 = new imagick("image1.png");

$image2 = new imagick("image2.png");

$result = $image1->compareImages($image2, Imagick::METRIC_MEANSQUAREERROR);
$result[0]->setImageFormat("png");

header("Content-Type: image/png");
echo $result[0];

?>

from the php doc.

This class can do the job too :
Comparison class

Oh and for fingerprint, the comparison is basically based on a very complicated methods (comparing 12 identical areas), you can’t just do it with simple php script