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prepareFaceImage()

Description

Crops out a selected area of an image and makes it ready to be used by FaceRecognizer.

Note: The selected area should follow the normalized coordinate system.

Parameters

ColumnTypeDefaultDescription
$image_path string Path of the source image
$prepared_image_path string Path of the prepared image
$x float X position
$y float Y position
$width float Width
$height float Height
$overwrite_existing boolean false Set to TRUE to overwrite existing prepared image (if any exists)

Return

boolean

Location

include/facial_recognition_functions.php lines 86 to 135

Definition

 
function prepareFaceImage($image_path, $prepared_image_path, $x, $y, $width, $height, $overwrite_existing = false)
    {
    if(!file_exists($image_path))
        {
        debug("FACIAL_RECOGNITION: Could not find image at '{$image_path}'");
        return false;
        }

    // Use existing prepared image if one is found
    if(!$overwrite_existing && file_exists($prepared_image_path))
        {
        return true;
        }

    // X, Y, width and height MUST be numeric
    if(!is_numeric($x) || !is_numeric($y) || !is_numeric($width) || !is_numeric($height))
        {
        return false;
        }

    $convert_fullpath = get_utility_path('im-convert');
    if(false === $convert_fullpath)
        {
        debug('FACIAL_RECOGNITION: Could not find ImageMagick "convert" utility!');
        return false;
        }

    list($image_width, $image_height) = getimagesize($image_path);

    $image_path_escaped          = escapeshellarg($image_path);
    $prepared_image_path_escaped = escapeshellarg($prepared_image_path);

    $x      = escapeshellarg(round($x * $image_width, 0));
    $y      = escapeshellarg(round($y * $image_height, 0));
    $width  = escapeshellarg(round($width * $image_width, 0));
    $height = escapeshellarg(round($height * $image_height, 0));

    $cmd  = $convert_fullpath;
    $cmd .= " {$image_path_escaped} -colorspace gray -depth 8";
    $cmd .= " -crop {$width}x{$height}+{$x}+{$y}";
    $cmd .= " -resize 90x90\>";
    $cmd .= " +repage {$prepared_image_path_escaped}";

    if('' !== run_command($cmd))
        {
        return false;
        }

    return true;
    }

This article was last updated 4th December 2024 08:35 Europe/London time based on the source file dated 19th September 2024 17:30 Europe/London time.