/**
* Compare two images and returns a hamming distance. A value of 0 indicates a likely similar picture. A value between 1 and 10 is potentially a variation. A value greater than 10 is likely a different image.
*
* @param ImageInterface|string $image1
* @param ImageInterface|string $image2
*
* @return int Hamming distance. Note: This breaks the chain if you are doing fluent api calls as it does not return an Editor.
* @throws \Exception
*/
public function compare($image1, $image2)
{
if (is_string($image1)) {
// If string passed, turn it into a Image object
$image1 = Image::createFromFile($image1);
$this->flatten($image1);
}
if (is_string($image2)) {
// If string passed, turn it into a Image object
$image2 = Image::createFromFile($image2);
$this->flatten($image2);
}
$hash = new DifferenceHash();
$bin1 = $hash->hash($image1, $this);
$bin2 = $hash->hash($image2, $this);
$str1 = str_split($bin1);
$str2 = str_split($bin2);
$distance = 0;
foreach ($str1 as $i => $char) {
if ($char !== $str2[$i]) {
$distance++;
}
}
return $distance;
}
