rekogition-face-calculations.php

<?php
$faces  = collect($result->get('FaceDetails') ?: [])->filter(function ($face) {
    // We want to be fairly confident that we found a face
    return $face['Confidence'] > 95;
});

$box = $faces->first()['BoundingBox'];

// Where the center of the face sits in relation to the entire image
$center_percentage = [
    'x' => round(($box['Left'] + ($box['Width'] / 2)) * 100),
    'y' => round(($box['Top'] + ($box['Height'] / 2)) * 100),
];

// The pixel coordinates of the center of the face
$center_position = [
    'x' => round($image->width * ($center_percentage['x'] / 100)),
    'y' => round($image->height * ($center_percentage['y'] / 100)),
];

// The pixel dimensions of the face
$face_dimensions = [
    'width'  => round($image->width * $box['Width']),
    'height' => round($image->height * $box['Height']),
];