PHP를 사용하여 이미지 콘텐츠의 유사성을 비교하는 방법은 무엇입니까?

<code class="php"><?php
// Load images
$image1 = new Imagick('image1.jpg');
$image2 = new Imagick('image2.jpg');

// Compare images
$result = $image1->compareImages($image2);

// Check similarity
if ($result[2] == 0) {
    echo 'Images are identical.';
} else {
    echo 'Images are different.';
}
?></code>

<code class="php"><?php
// Load images
$image1 = imagecreatefromjpeg('image1.jpg');
$image2 = imagecreatefromjpeg('image2.jpg');

// Create transparent copies
$image1Trans = imagecopymerge($image1, $image1, 0, 0, 0, 0, imagesx($image1), imagesy($image1), 50);
$image2Trans = imagecopymerge($image2, $image2, 0, 0, 0, 0, imagesx($image2), imagesy($image2), 50);

// Blend images
$onionSkin = imagecopymerge($image1Trans, $image2Trans, 0, 0, 0, 0, imagesx($image1), imagesy($image1), 100);

// Save result
imagejpeg($onionSkin, 'onionSkin.jpg');
?></code>